Upload normal Monerujo code

.circleci/config.yml

@@ -0,0 +1,27 @@
+version: 2
+jobs:
+  build:
+    working_directory: ~/code
+    docker:
+      - image: cimg/android:2022.03-ndk
+    environment:
+      JVM_OPTS: -Xmx3200m
+    steps:
+      - checkout
+      - restore_cache:
+          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
+      - run:
+          name: Download Dependencies
+          command: ./gradlew androidDependencies
+      - save_cache:
+          paths:
+            - ~/.gradle
+          key: jars-{{ checksum "build.gradle" }}-{{ checksum  "app/build.gradle" }}
+      - run:
+          name: Run Tests
+          command: ./gradlew test
+      - store_artifacts:
+          path: app/build/reports
+          destination: reports
+      - store_test_results:
+          path: app/build/test-results

.gitignore

@@ -1,23 +1,18 @@
-# Compiled class file
-*.class
-
-# Log file
-*.log
-
-# BlueJ files
-*.ctxt
-
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
-
-# Package Files #
-*.jar
-*.war
-*.nar
-*.ear
-*.zip
-*.tar.gz
-*.rar
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+.gradle
+/build
+*.iml
+/.idea
+/local.properties
+/captures
+.externalNativeBuild
+.DS_Store
+/app/build
+/app/release
+/app/alpha
+/app/prod
+/app/alphaMainnet
+/app/prodMainnet
+/app/alphaStagenet
+/app/prodStagenet
+/app/.cxx
+/monerujo.id

app/CMakeLists.txt

@@ -0,0 +1,239 @@
+cmake_minimum_required(VERSION 3.4.1)
+message(STATUS ABI_INFO  = ${ANDROID_ABI})
+
+add_library( monerujo
+             SHARED
+             src/main/cpp/monerujo.cpp )
+
+set(EXTERNAL_LIBS_DIR ${CMAKE_SOURCE_DIR}/../external-libs)
+
+############
+# libsodium
+############
+
+add_library(sodium STATIC IMPORTED)
+set_target_properties(sodium PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libsodium.a)
+
+############
+# OpenSSL
+############
+
+add_library(crypto STATIC IMPORTED)
+set_target_properties(crypto PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libcrypto.a)
+
+add_library(ssl STATIC IMPORTED)
+set_target_properties(ssl PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libssl.a)
+
+############
+# Boost
+############
+
+add_library(boost_chrono STATIC IMPORTED)
+set_target_properties(boost_chrono PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_chrono.a)
+
+add_library(boost_date_time STATIC IMPORTED)
+set_target_properties(boost_date_time PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_date_time.a)
+
+add_library(boost_filesystem STATIC IMPORTED)
+set_target_properties(boost_filesystem PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_filesystem.a)
+
+add_library(boost_program_options STATIC IMPORTED)
+set_target_properties(boost_program_options PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_program_options.a)
+
+add_library(boost_regex STATIC IMPORTED)
+set_target_properties(boost_regex PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_regex.a)
+
+add_library(boost_serialization STATIC IMPORTED)
+set_target_properties(boost_serialization PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_serialization.a)
+
+add_library(boost_system STATIC IMPORTED)
+set_target_properties(boost_system PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_system.a)
+
+add_library(boost_thread STATIC IMPORTED)
+set_target_properties(boost_thread PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_thread.a)
+
+add_library(boost_wserialization STATIC IMPORTED)
+set_target_properties(boost_wserialization PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libboost_wserialization.a)
+
+#############
+# Monero
+#############
+
+add_library(wallet_api STATIC IMPORTED)
+set_target_properties(wallet_api PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libwallet_api.a)
+
+add_library(wallet STATIC IMPORTED)
+set_target_properties(wallet PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libwallet.a)
+
+add_library(cryptonote_core STATIC IMPORTED)
+set_target_properties(cryptonote_core PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libcryptonote_core.a)
+
+add_library(cryptonote_basic STATIC IMPORTED)
+set_target_properties(cryptonote_basic PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libcryptonote_basic.a)
+
+add_library(mnemonics STATIC IMPORTED)
+set_target_properties(mnemonics PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libmnemonics.a)
+
+add_library(common STATIC IMPORTED)
+set_target_properties(common PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libcommon.a)
+
+add_library(cncrypto STATIC IMPORTED)
+set_target_properties(cncrypto PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libcncrypto.a)
+
+add_library(ringct STATIC IMPORTED)
+set_target_properties(ringct PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libringct.a)
+
+add_library(ringct_basic STATIC IMPORTED)
+set_target_properties(ringct_basic PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libringct_basic.a)
+
+add_library(blockchain_db STATIC IMPORTED)
+set_target_properties(blockchain_db PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libblockchain_db.a)
+
+add_library(lmdb STATIC IMPORTED)
+set_target_properties(lmdb PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/liblmdb.a)
+
+add_library(easylogging STATIC IMPORTED)
+set_target_properties(easylogging PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libeasylogging.a)
+
+add_library(unbound STATIC IMPORTED)
+set_target_properties(unbound PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/libunbound.a)
+
+add_library(epee STATIC IMPORTED)
+set_target_properties(epee PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libepee.a)
+
+add_library(blocks STATIC IMPORTED)
+set_target_properties(blocks PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libblocks.a)
+
+add_library(checkpoints STATIC IMPORTED)
+set_target_properties(checkpoints PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libcheckpoints.a)
+
+add_library(device STATIC IMPORTED)
+set_target_properties(device PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libdevice.a)
+
+add_library(device_trezor STATIC IMPORTED)
+set_target_properties(device_trezor PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libdevice_trezor.a)
+
+add_library(multisig STATIC IMPORTED)
+set_target_properties(multisig PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libmultisig.a)
+
+add_library(version STATIC IMPORTED)
+set_target_properties(version PROPERTIES IMPORTED_LOCATION
+    ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libversion.a)
+
+add_library(net STATIC IMPORTED)
+set_target_properties(net PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libnet.a)
+
+add_library(hardforks STATIC IMPORTED)
+set_target_properties(hardforks PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libhardforks.a)
+
+add_library(randomx STATIC IMPORTED)
+set_target_properties(randomx PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/librandomx.a)
+
+add_library(rpc_base STATIC IMPORTED)
+set_target_properties(rpc_base PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/librpc_base.a)
+
+add_library(wallet-crypto STATIC IMPORTED)
+set_target_properties(wallet-crypto PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libwallet-crypto.a)
+
+add_library(cryptonote_format_utils_basic STATIC IMPORTED)
+set_target_properties(cryptonote_format_utils_basic PROPERTIES IMPORTED_LOCATION
+        ${EXTERNAL_LIBS_DIR}/${ANDROID_ABI}/monero/libcryptonote_format_utils_basic.a)
+
+#############
+# System
+#############
+
+find_library( log-lib log )
+
+include_directories( ${EXTERNAL_LIBS_DIR}/include )
+
+message(STATUS EXTERNAL_LIBS_DIR :  ${EXTERNAL_LIBS_DIR})
+
+if(${ANDROID_ABI} STREQUAL "x86_64")
+    set(EXTRA_LIBS "wallet-crypto")
+else()
+    set(EXTRA_LIBS "")
+endif()
+
+target_link_libraries(  monerujo
+
+                        wallet_api
+                        wallet
+                        cryptonote_core
+                        cryptonote_basic
+                        cryptonote_format_utils_basic
+                        mnemonics
+                        ringct
+                        ringct_basic
+                        net
+                        common
+                        cncrypto
+                        blockchain_db
+                        lmdb
+                        easylogging
+                        unbound
+                        epee
+                        blocks
+                        checkpoints
+                        device
+                        device_trezor
+                        multisig
+                        version
+                        randomx
+                        hardforks
+                        rpc_base
+                        ${EXTRA_LIBS}
+
+                        boost_chrono
+                        boost_date_time
+                        boost_filesystem
+                        boost_program_options
+                        boost_regex
+                        boost_serialization
+                        boost_system
+                        boost_thread
+                        boost_wserialization
+
+                        ssl
+                        crypto
+
+                        sodium
+
+                       ${log-lib}
+                       )

app/build.gradle

@@ -0,0 +1,159 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 31
+    buildToolsVersion '30.0.3'
+    ndkVersion '17.2.4988734'
+    defaultConfig {
+        applicationId "com.m2049r.xmrwallet"
+        minSdkVersion 21
+        targetSdkVersion 31
+        versionCode 3002
+        versionName "3.0.2 'Fluorine Fermi'"
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+        externalNativeBuild {
+            cmake {
+                cppFlags "-std=c++11"
+                arguments '-DANDROID_STL=c++_shared'
+            }
+        }
+    }
+    bundle {
+        language {
+            enableSplit = false
+        }
+    }
+
+    flavorDimensions 'type', 'net'
+    productFlavors {
+        mainnet {
+            dimension 'net'
+        }
+        stagenet {
+            dimension 'net'
+            applicationIdSuffix '.stage'
+            versionNameSuffix ' (stage)'
+        }
+        devnet {
+            dimension 'net'
+            applicationIdSuffix '.test'
+            versionNameSuffix ' (test)'
+        }
+        alpha {
+            dimension 'type'
+            applicationIdSuffix '.alpha'
+            versionNameSuffix ' (alpha)'
+        }
+        prod {
+            dimension 'type'
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+        debug {
+            applicationIdSuffix ".debug"
+        }
+        applicationVariants.all { variant ->
+            variant.buildConfigField "String", "ID_A", "\"" + getId("ID_A") + "\""
+        }
+    }
+
+    externalNativeBuild {
+        cmake {
+            path "CMakeLists.txt"
+        }
+    }
+
+    splits {
+        abi {
+            enable true
+            reset()
+            include 'armeabi-v7a', 'arm64-v8a', 'x86_64'
+            universalApk true
+        }
+    }
+
+    // Map for the version code that gives each ABI a value.
+    def abiCodes = ['armeabi-v7a': 1, 'arm64-v8a': 2, 'x86': 3, 'x86_64': 4]
+
+    // Enumerate translated locales
+    def availableLocales = ["en"]
+    new File("app/src/main/res/").eachFileMatch(~/^values-.*/) { file ->
+        def languageTag = file.name.substring(7).replace("-r", "-")
+        if (languageTag != "night")
+            availableLocales.add(languageTag)
+    }
+
+    // APKs for the same app that all have the same version information.
+    android.applicationVariants.all { variant ->
+        // Update string resource: available_locales
+        variant.resValue("string", "available_locales", availableLocales.join(","))
+        // Assigns a different version code for each output APK.
+        variant.outputs.all {
+            output ->
+                def abiName = output.getFilter(com.android.build.OutputFile.ABI)
+                output.versionCodeOverride = abiCodes.get(abiName, 0) + 10 * versionCode
+
+                if (abiName == null) abiName = "universal"
+                def v = "${variant.versionName}".replaceFirst(" '.*' ?", "")
+                        .replace(".", "x")
+                        .replace("(", "-")
+                        .replace(")", "")
+                outputFileName = "$rootProject.ext.apkName-" + v + "_" + abiName + ".apk"
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    namespace 'com.m2049r.xmrwallet'
+}
+
+static def getId(name) {
+    Properties props = new Properties()
+    props.load(new FileInputStream(new File('monerujo.id')))
+    return props[name]
+}
+
+dependencies {
+    implementation 'androidx.core:core:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
+    implementation 'androidx.cardview:cardview:1.0.0'
+    implementation 'androidx.swiperefreshlayout:swiperefreshlayout:1.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+    implementation 'androidx.preference:preference:1.2.0'
+
+    implementation 'com.google.android.material:material:1.6.0'
+
+    implementation 'me.dm7.barcodescanner:zxing:1.9.8'
+    implementation "com.squareup.okhttp3:okhttp:4.9.3"
+    implementation "io.github.rburgst:okhttp-digest:2.6"
+    implementation "com.jakewharton.timber:timber:5.0.1"
+
+    implementation 'info.guardianproject.netcipher:netcipher:2.1.0'
+    //implementation 'info.guardianproject.netcipher:netcipher-okhttp3:2.1.0'
+    implementation fileTree(dir: 'libs/classes', include: ['*.jar'])
+    implementation 'com.nulab-inc:zxcvbn:1.5.2'
+
+    implementation 'dnsjava:dnsjava:2.1.9'
+    implementation 'org.jitsi:dnssecjava:1.2.0'
+    implementation 'org.slf4j:slf4j-nop:1.7.36'
+    implementation 'com.github.brnunes:swipeablerecyclerview:1.0.2'
+
+    //noinspection GradleDependency
+    testImplementation "junit:junit:4.13.2"
+    testImplementation "org.mockito:mockito-all:1.10.19"
+    testImplementation "com.squareup.okhttp3:mockwebserver:4.9.3"
+    testImplementation 'org.json:json:20211205'
+    testImplementation 'net.jodah:concurrentunit:0.4.6'
+
+    compileOnly 'org.projectlombok:lombok:1.18.22'
+    annotationProcessor 'org.projectlombok:lombok:1.18.22'
+}

app/proguard-rules.pro

@@ -0,0 +1,25 @@
+# Add project specific ProGuard rules here.
+# By default, the flags in this file are appended to flags specified
+# in C:\Users\Test\AppData\Local\Android\Sdk/tools/proguard/proguard-android.txt
+# You can edit the include path and order by changing the proguardFiles
+# directive in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# Add any project specific keep options here:
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/main/AndroidManifest.xml

@@ -0,0 +1,111 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.USE_FINGERPRINT" />
+    <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.CAMERA" />
+    <uses-permission android:name="android.permission.USE_BIOMETRIC" />
+    <uses-permission android:name="android.permission.NFC" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+    <queries>
+        <intent>
+            <action android:name="org.torproject.android.intent.action.START" />
+        </intent>
+        <intent>
+            <action android:name="org.torproject.android.intent.action.STATUS" />
+        </intent>
+        <intent>
+            <action android:name="org.torproject.android.REQUEST_HS_PORT" />
+        </intent>
+        <intent>
+            <action android:name="org.torproject.android.REQUEST_V3_ONION_SERVICE" />
+        </intent>
+
+        <package android:name="org.torproject.android" />
+    </queries>
+
+    <application
+        android:name=".XmrWalletApplication"
+        android:allowBackup="false"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:preserveLegacyExternalStorage="true"
+        android:supportsRtl="true"
+        android:theme="@style/MyMaterialThemeClassic"
+        android:usesCleartextTraffic="true">
+        <activity
+            android:name=".MainActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:screenOrientation="portrait">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".WalletActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
+            android:label="@string/wallet_activity_name"
+            android:launchMode="singleTask"
+            android:screenOrientation="behind" />
+        <activity
+            android:name=".LoginActivity"
+            android:configChanges="orientation|keyboardHidden"
+            android:exported="true"
+            android:label="@string/app_name"
+            android:launchMode="singleTop"
+            android:screenOrientation="locked">
+            <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
+            </intent-filter>
+            <intent-filter android:label="@string/app_name">
+                <action android:name="android.intent.action.VIEW" />
+
+                <data android:scheme="monero" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+            </intent-filter>
+            <intent-filter android:label="@string/app_name">
+                <action android:name="android.intent.action.VIEW" />
+
+                <data android:scheme="bitcoin" />
+
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.BROWSABLE" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED"
+                android:resource="@xml/usb_device_filter" />
+        </activity>
+        <activity
+            android:name=".onboarding.OnBoardingActivity"
+            android:configChanges="orientation|keyboardHidden|uiMode"
+            android:launchMode="singleTask"
+            android:screenOrientation="portrait" />
+
+        <service
+            android:name=".service.WalletService"
+            android:description="@string/service_description"
+            android:exported="false"
+            android:label="Monero Wallet Service" />
+
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.fileprovider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/filepaths" />
+        </provider>
+    </application>
+
+</manifest>

app/src/main/assets/licenses.html

@@ -0,0 +1,829 @@
+<h1>Open Source Licenses</h1>
+<h2>Licensed under the Apache License, Version 2.0</h2>
+<h3>monerujo (https://github.com/m2049r/xmrwallet)</h3>
+Copyright (c) 2017-2018 m2049r et al.
+
+<h3>The Android Open Source Project</h3>
+<ul>
+    <li>com.android.support:design</li>
+    <li>com.android.support:support-v4</li>
+    <li>com.android.support:appcompat-v7</li>
+    <li>com.android.support:recyclerview-v7</li>
+    <li>com.android.support:cardview-v7</li>
+    <li>com.android.support.constraint:constraint-layout</li>
+    <li>com.android.support:support-annotations</li>
+    <li>com.android.support:support-vector-drawable</li>
+    <li>com.android.support:animated-vector-drawable</li>
+    <li>com.android.support:transition</li>
+    <li>com.android.support:support-compat</li>
+    <li>com.android.support:support-media-compat</li>
+    <li>com.android.support:support-core-utils</li>
+    <li>com.android.support:support-core-ui</li>
+    <li>com.android.support:support-fragment</li>
+    <li>com.android.support.constraint:constraint-layout-solver</li>
+</ul>
+Copyright (c) The Android Open Source Project
+
+<h3>OkHttp</h3>
+Copyright (c) 2014 Square, Inc.
+
+<h3>Timber</h3>
+Copyright (c) 2013 Jake Wharton
+
+<h3>com.google.zxing:core</h3>
+Copyright (c) 2012 ZXing authors
+
+<h3>me.dm7.barcodescanner</h3>
+<ul>
+    <li>me.dm7.barcodescanner:core</li>
+    <li>me.dm7.barcodescanner:zxing</li>
+</ul>
+Copyright (c) 2014 Dushyanth Maguluru
+
+<h3>AndroidLicensesPage (https://github.com/adamsp/AndroidLicensesPage)</h3>
+Copyright (c) 2013 Adam Speakman
+
+<h3>SwipeableRecyclerView (https://github.com/brnunes/SwipeableRecyclerView)</h3>
+Copyright (c) 2015 Bruno R. Nunes
+
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+
+<h2>dnsjava (http://dnsjava.org/)</h2>
+Copyright (c) 1998-2011, Brian Wellington. All rights reserved.<br/>
+<h3>The 2-Clause BSD License</h3>
+<br/>
+Redistribution and use in source and binary forms, with or without
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+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+<h2>dnssecjava - a DNSSEC validating stub resolver for Java</h2>
+Copyright (c) 2013-2015 Ingo Bauersachs
+<h3>The Eclipse Public License - v 1.0</h3>
+THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
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+
+<h2>Licensed under the MIT License</h2>
+<h3>rapidjson (https://github.com/monero-project/monero/blob/master/external/rapidjson)</h3>
+Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
+<h3>easylogging++ (https://github.com/monero-project/monero/tree/master/external/easylogging%2B%2B)</h3>
+Copyright (c) 2017 muflihun.com
+<h3>zxcvbn4j (https://github.com/nulab/zxcvbn4j)</h3>
+Copyright (c) 2014 Nulab Inc
+<h3>slfj-nop - Simple Logging Facade for Java no-operation binding (https://www.slf4j.org/)</h3>
+Copyright (c) 2004-2017 QOS.ch
+<h3>The MIT License</h3>
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+and associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:<br/>
+<br/>
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.<br/>
+<br/>
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.<br/>
+
+<h2>Monero (https://github.com/monero-project/monero)</h2>
+<h3>The Monero Project License</h3>
+Copyright (c) 2014-2017, The Monero Project. All rights reserved.<br/>
+<br/>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:<br/>
+<br/>
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.<br/>
+<br/>
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.<br/>
+<br/>
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.<br/>
+<br/>
+Parts of the project are originally copyright (c) 2012-2013 The Cryptonote
+developers
+
+<h2>OpenSSL (https://github.com/openssl/openssl)</h2>
+<h3>LICENSE ISSUES</h3>
+The OpenSSL toolkit stays under a double license, i.e. both the conditions of
+the OpenSSL License and the original SSLeay license apply to the toolkit.
+See below for the actual license texts.
+<h3>OpenSSL License</h3>
+Copyright (c) 1998-2017 The OpenSSL Project.  All rights reserved.<br/>
+<br/>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:<br/>
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.<br/>
+<br/>
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in
+the documentation and/or other materials provided with the
+distribution.<br/>
+<br/>
+3. All advertising materials mentioning features or use of this
+software must display the following acknowledgment:
+"This product includes software developed by the OpenSSL Project
+for use in the OpenSSL Toolkit. (http://www.openssl.org/)"<br/>
+<br/>
+4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+endorse or promote products derived from this software without
+prior written permission. For written permission, please contact
+openssl-core@openssl.org.<br/>
+<br/>
+5. Products derived from this software may not be called "OpenSSL"
+nor may "OpenSSL" appear in their names without prior written
+permission of the OpenSSL Project.<br/>
+<br/>
+6. Redistributions of any form whatsoever must retain the following
+acknowledgment:<br/>
+"This product includes software developed by the OpenSSL Project
+for use in the OpenSSL Toolkit (http://www.openssl.org/)"<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT "AS IS" AND ANY
+EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+OF THE POSSIBILITY OF SUCH DAMAGE.<br/>
+<br/>
+This product includes cryptographic software written by Eric Young
+(eay@cryptsoft.com).  This product includes software written by Tim
+Hudson (tjh@cryptsoft.com).
+<h3>Original SSLeay License</h3>
+Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com). All rights reserved.<br/>
+<br/>
+This package is an SSL implementation written
+by Eric Young (eay@cryptsoft.com).
+The implementation was written so as to conform with Netscapes SSL.<br/>
+<br/>
+This library is free for commercial and non-commercial use as long as
+the following conditions are aheared to.  The following conditions
+apply to all code found in this distribution, be it the RC4, RSA,
+lhash, DES, etc., code; not just the SSL code.  The SSL documentation
+included with this distribution is covered by the same copyright terms
+except that the holder is Tim Hudson (tjh@cryptsoft.com).<br/>
+<br/>
+Copyright remains Eric Young&apos;s, and as such any Copyright notices in
+the code are not to be removed.
+If this package is used in a product, Eric Young should be given attribution
+as the author of the parts of the library used.
+This can be in the form of a textual message at program startup or
+in documentation (online or textual) provided with the package.<br/>
+<br/>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:<br/>
+1. Redistributions of source code must retain the copyright
+notice, this list of conditions and the following disclaimer.<br/>
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.<br/>
+3. All advertising materials mentioning features or use of this software
+must display the following acknowledgement:<br/>
+"This product includes cryptographic software written by
+Eric Young (eay@cryptsoft.com)"
+The word &apos;cryptographic&apos; can be left out if the rouines from the library
+being used are not cryptographic related :-).<br/>
+4. If you include any Windows specific code (or a derivative thereof) from
+the apps directory (application code) you must include an acknowledgement:
+"This product includes software written by Tim Hudson (tjh@cryptsoft.com)"<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY ERIC YOUNG "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGE.<br/>
+<br/>
+The licence and distribution terms for any publically available version or
+derivative of this code cannot be changed.  i.e. this code cannot simply be
+copied and put under another distribution licence
+[including the GNU Public Licence.]
+
+<h2>Boost</h2>
+<ul>
+    <li>Boost (https://sourceforge.net/projects/boost)</li>
+    <li>Boost/Archive (https://github.com/monero-project/monero/tree/master/external/boost/archive)</li>
+</ul>
+<h3>Boost Software License - Version 1.0 - August 17th, 2003</h3>
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:<br/>
+<br/>
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.<br/>
+<br/>
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+<h2>Unbound (https://github.com/monero-project/monero/blob/master/external/unbound)</h2>
+<h3>Unbound Software License</h3>
+Copyright (c) 2007, NLnet Labs. All rights reserved.<br/>
+<br/>
+This software is open source.<br/>
+<br/>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:<br/>
+<br/>
+Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.<br/>
+<br/>
+Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.<br/>
+<br/>
+Neither the name of the NLNET LABS nor the names of its contributors may
+be used to endorse or promote products derived from this software without
+specific prior written permission.<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+<h2>MiniUPnPc (https://github.com/monero-project/monero/blob/master/external/miniupnpc)</h2>
+Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip. All rights reserved.
+<h3>The MiniUPnPc License</h3>
+Copyright (c) 2005-2015, Thomas BERNARD. All rights reserved.<br/>
+<br/>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:<br/>
+<br/>
+* Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.<br/>
+* Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.<br/>
+* The name of the author may not be used to endorse or promote products
+derived from this software without specific prior written permission.<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+
+<h2>liblmdb (https://github.com/monero-project/monero/blob/master/external/db_drivers/liblmdb)</h2>
+<h3>The OpenLDAP Public License, Version 2.8, 17 August 2003</h3>
+Redistribution and use of this software and associated documentation
+("Software"), with or without modification, are permitted provided
+that the following conditions are met:<br/>
+<br/>
+1. Redistributions in source form must retain copyright statements
+and notices,<br/>
+<br/>
+2. Redistributions in binary form must reproduce applicable copyright
+statements and notices, this list of conditions, and the following
+disclaimer in the documentation and/or other materials provided
+with the distribution, and<br/>
+<br/>
+3. Redistributions must contain a verbatim copy of this document.<br/>
+<br/>
+The OpenLDAP Foundation may revise this license from time to time.
+Each revision is distinguished by a version number.  You may use
+this Software under terms of this license revision or under the
+terms of any subsequent revision of the license.<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY THE OPENLDAP FOUNDATION AND ITS
+CONTRIBUTORS "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
+INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT
+SHALL THE OPENLDAP FOUNDATION, ITS CONTRIBUTORS, OR THE AUTHOR(S)
+OR OWNER(S) OF THE SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.<br/>
+<br/>
+The names of the authors and copyright holders must not be used in
+advertising or otherwise to promote the sale, use or other dealing
+in this Software without specific, written prior permission.  Title
+to copyright in this Software shall at all times remain with copyright
+holders.<br/>
+<br/>
+OpenLDAP is a registered trademark of the OpenLDAP Foundation.<br/>
+<br/>
+Copyright 1999-2003 The OpenLDAP Foundation, Redwood City,
+California, USA.  All Rights Reserved.  Permission to copy and
+distribute verbatim copies of this document is granted.
+
+<h2>epee (https://github.com/monero-project/monero/blob/master/contrib/epee)</h2>
+Copyright (c) 2006-2013, Andrey N. Sabelnikov, www.sabelnikov.net. All rights reserved.
+<h3>The epee License</h3>
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:<br/>
+* Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.<br/>
+* Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.<br/>
+* Neither the name of the Andrey N. Sabelnikov nor the
+names of its contributors may be used to endorse or promote products
+derived from this software without specific prior written permission.<br/>
+<br/>
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL Andrey N. Sabelnikov BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+<h2>&apos;Poppins&apos; Font</h2>
+<h3>SIL Open Font License</h3>
+<p>Copyright (c) 2014, Indian Type Foundry (info@indiantypefoundry.com).</p>
+<p>This Font Software is licensed under the SIL Open Font License, Version 1.1.<br />
+    This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL</p>
+<p>&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<br />
+    SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007<br />
+    &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-</p>
+<p>PREAMBLE<br />
+    The goals of the Open Font License (OFL) are to stimulate worldwide development of
+    collaborative font projects, to support the font creation efforts of academic and
+    linguistic communities, and to provide a free and open framework in which fonts may be
+    shared and improved in partnership with others.</p>
+<p>The OFL allows the licensed fonts to be used, studied, modified and redistributed freely as
+    long as they are not sold by themselves. The fonts, including any derivative works, can be
+    bundled, embedded, redistributed and/or sold with any software provided that any reserved
+    names are not used by derivative works. The fonts and derivatives, however, cannot be
+    released under any other type of license. The requirement for fonts to remain under this
+    license does not apply to any document created using the fonts or their derivatives.</p>
+<p>DEFINITIONS<br />
+    &#8220;Font Software&#8221; refers to the set of files released by the Copyright Holder(s)
+    under this license and clearly marked as such. This may include source files, build scripts
+    and documentation.</p>
+<p>&#8220;Reserved Font Name&#8221; refers to any names specified as such after the copyright
+    statement(s).</p>
+<p>&#8220;Original Version&#8221; refers to the collection of Font Software components as
+    distributed by the Copyright Holder(s).</p>
+<p>&#8220;Modified Version&#8221; refers to any derivative made by adding to, deleting, or
+    substituting&#8212;in part or in whole&#8212;any of the components of the Original Version,
+    by changing formats or by porting the Font Software to a new environment.</p>
+<p>&#8220;Author&#8221; refers to any designer, engineer, programmer, technical writer or other
+    person who contributed to the Font Software.</p>
+<p>PERMISSION &amp; CONDITIONS<br />
+    Permission is hereby granted, free of charge, to any person obtaining a copy of the Font
+    Software, to use, study, copy, merge, embed, modify, redistribute, and sell modified and
+    unmodified copies of the Font Software, subject to the following conditions:</p>
+<p>1) Neither the Font Software nor any of its individual components, in Original or Modified
+    Versions, may be sold by itself.</p>
+<p>2) Original or Modified Versions of the Font Software may be bundled, redistributed and/or sold
+    with any software, provided that each copy contains the above copyright notice and this
+    license. These can be included either as stand-alone text files, human-readable headers or
+    in the appropriate machine-readable metadata fields within text or binary files as long as
+    those fields can be easily viewed by the user.</p>
+<p>3) No Modified Version of the Font Software may use the Reserved Font Name(s) unless explicit
+    written permission is granted by the corresponding Copyright Holder. This restriction only
+    applies to the primary font name as presented to the users.</p>
+<p>4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font Software shall not be
+    used to promote, endorse or advertise any Modified Version, except to acknowledge the
+    contribution(s) of the Copyright Holder(s) and the Author(s) or with their explicit
+    written permission.</p>
+<p>5) The Font Software, modified or unmodified, in part or in whole, must be distributed entirely
+    under this license, and must not be distributed under any other license. The requirement
+    for fonts to remain under this license does not apply to any document created using the Font
+    Software.</p>
+<p>TERMINATION<br />
+    This license becomes null and void if any of the above conditions are not met.</p>
+<p>DISCLAIMER<br />
+    THE FONT SOFTWARE IS PROVIDED &#8220;AS IS&#8221;, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+    PARTICULAR PURPOSE AND NONINFRINGEMENT OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN
+    NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+    INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER IN
+    AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF THE USE OR INABILITY TO USE
+    THE FONT SOFTWARE OR FROM OTHER DEALINGS IN THE FONT SOFTWARE.</p>

app/src/main/cpp/monerujo.h

@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) 2017 m2049r
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef XMRWALLET_WALLET_LIB_H
+#define XMRWALLET_WALLET_LIB_H
+
+#include <jni.h>
+
+/*
+#include <android/log.h>
+
+#define  LOG_TAG    "[NDK]"
+#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
+#define  LOGW(...)  __android_log_print(ANDROID_LOG_WARN,LOG_TAG,__VA_ARGS__)
+#define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)
+*/
+
+jfieldID getHandleField(JNIEnv *env, jobject obj, const char *fieldName = "handle") {
+    jclass c = env->GetObjectClass(obj);
+    return env->GetFieldID(c, fieldName, "J"); // of type long
+}
+
+template<typename T>
+T *getHandle(JNIEnv *env, jobject obj, const char *fieldName = "handle") {
+    jlong handle = env->GetLongField(obj, getHandleField(env, obj, fieldName));
+    return reinterpret_cast<T *>(handle);
+}
+
+void setHandleFromLong(JNIEnv *env, jobject obj, jlong handle) {
+    env->SetLongField(obj, getHandleField(env, obj), handle);
+}
+
+template<typename T>
+void setHandle(JNIEnv *env, jobject obj, T *t) {
+    jlong handle = reinterpret_cast<jlong>(t);
+    setHandleFromLong(env, obj, handle);
+}
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+extern const char* const MONERO_VERSION; // the actual monero core version
+
+// from monero-core crypto/hash-ops.h - avoid #including monero code here
+enum {
+    HASH_SIZE = 32,
+    HASH_DATA_AREA = 136
+};
+
+void cn_slow_hash(const void *data, size_t length, char *hash, int variant, int prehashed, uint64_t height);
+
+inline void slow_hash(const void *data, const size_t length, char *hash) {
+    cn_slow_hash(data, length, hash, 0 /*variant*/, 0 /*prehashed*/, 0 /*height*/);
+}
+
+inline void slow_hash_broken(const void *data, char *hash, int variant) {
+    cn_slow_hash(data, 200 /*sizeof(union hash_state)*/, hash, variant, 1 /*prehashed*/, 0 /*height*/);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif //XMRWALLET_WALLET_LIB_H

app/src/main/java/com/btchip/BTChipException.java

@@ -0,0 +1,53 @@
+/*
+ *******************************************************************************
+ *   BTChip Bitcoin Hardware Wallet Java API
+ *   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *   limitations under the License.
+ ********************************************************************************
+ */
+
+package com.btchip;
+
+public class BTChipException extends Exception {
+
+    private static final long serialVersionUID = 5512803003827126405L;
+
+    public BTChipException(String reason) {
+        super(reason);
+    }
+
+    public BTChipException(String reason, Throwable cause) {
+        super(reason, cause);
+    }
+
+    public BTChipException(String reason, int sw) {
+        super(reason);
+        this.sw = sw;
+    }
+
+    public int getSW() {
+        return sw;
+    }
+
+    public String toString() {
+        if (sw == 0) {
+            return "BTChip Exception : " + getMessage();
+        } else {
+            return "BTChip Exception : " + getMessage() + " " + Integer.toHexString(sw);
+        }
+    }
+
+    private int sw;
+
+}

app/src/main/java/com/btchip/comm/BTChipTransport.java

@@ -0,0 +1,31 @@
+/*
+ *******************************************************************************
+ *   BTChip Bitcoin Hardware Wallet Java API
+ *   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
+ *   (c) 2018 m2049r
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *   limitations under the License.
+ ********************************************************************************
+ */
+
+package com.btchip.comm;
+
+import com.btchip.BTChipException;
+
+public interface BTChipTransport {
+    byte[] exchange(byte[] command);
+
+    void close();
+
+    void setDebug(boolean debugFlag);
+}

app/src/main/java/com/btchip/comm/LedgerHelper.java

@@ -0,0 +1,126 @@
+/*
+ *******************************************************************************
+ *   BTChip Bitcoin Hardware Wallet Java API
+ *   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
+ *   (c) 2018 m2049r
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *   limitations under the License.
+ ********************************************************************************
+ */
+
+package com.btchip.comm;
+
+import java.io.ByteArrayOutputStream;
+
+public class LedgerHelper {
+
+    private static final int TAG_APDU = 0x05;
+
+    public static byte[] wrapCommandAPDU(int channel, byte[] command, int packetSize) {
+        ByteArrayOutputStream output = new ByteArrayOutputStream();
+        if (packetSize < 3) {
+            throw new IllegalArgumentException("Can't handle Ledger framing with less than 3 bytes for the report");
+        }
+        int sequenceIdx = 0;
+        int offset = 0;
+        output.write(channel >> 8);
+        output.write(channel);
+        output.write(TAG_APDU);
+        output.write(sequenceIdx >> 8);
+        output.write(sequenceIdx);
+        sequenceIdx++;
+        output.write(command.length >> 8);
+        output.write(command.length);
+        int blockSize = (command.length > packetSize - 7 ? packetSize - 7 : command.length);
+        output.write(command, offset, blockSize);
+        offset += blockSize;
+        while (offset != command.length) {
+            output.write(channel >> 8);
+            output.write(channel);
+            output.write(TAG_APDU);
+            output.write(sequenceIdx >> 8);
+            output.write(sequenceIdx);
+            sequenceIdx++;
+            blockSize = (command.length - offset > packetSize - 5 ? packetSize - 5 : command.length - offset);
+            output.write(command, offset, blockSize);
+            offset += blockSize;
+        }
+        if ((output.size() % packetSize) != 0) {
+            byte[] padding = new byte[packetSize - (output.size() % packetSize)];
+            output.write(padding, 0, padding.length);
+        }
+        return output.toByteArray();
+    }
+
+    public static byte[] unwrapResponseAPDU(int channel, byte[] data, int packetSize) {
+        ByteArrayOutputStream response = new ByteArrayOutputStream();
+        int offset = 0;
+        int responseLength;
+        int sequenceIdx = 0;
+        if ((data == null) || (data.length < 7 + 5)) {
+            return null;
+        }
+        if (data[offset++] != (channel >> 8)) {
+            throw new IllegalArgumentException("Invalid channel");
+        }
+        if (data[offset++] != (channel & 0xff)) {
+            throw new IllegalArgumentException("Invalid channel");
+        }
+        if (data[offset++] != TAG_APDU) {
+            throw new IllegalArgumentException("Invalid tag");
+        }
+        if (data[offset++] != 0x00) {
+            throw new IllegalArgumentException("Invalid sequence");
+        }
+        if (data[offset++] != 0x00) {
+            throw new IllegalArgumentException("Invalid sequence");
+        }
+        responseLength = ((data[offset++] & 0xff) << 8);
+        responseLength |= (data[offset++] & 0xff);
+        if (data.length < 7 + responseLength) {
+            return null;
+        }
+        int blockSize = (responseLength > packetSize - 7 ? packetSize - 7 : responseLength);
+        response.write(data, offset, blockSize);
+        offset += blockSize;
+        while (response.size() != responseLength) {
+            sequenceIdx++;
+            if (offset == data.length) {
+                return null;
+            }
+            if (data[offset++] != (channel >> 8)) {
+                throw new IllegalArgumentException("Invalid channel");
+            }
+            if (data[offset++] != (channel & 0xff)) {
+                throw new IllegalArgumentException("Invalid channel");
+            }
+            if (data[offset++] != TAG_APDU) {
+                throw new IllegalArgumentException("Invalid tag");
+            }
+            if (data[offset++] != (sequenceIdx >> 8)) {
+                throw new IllegalArgumentException("Invalid sequence");
+            }
+            if (data[offset++] != (sequenceIdx & 0xff)) {
+                throw new IllegalArgumentException("Invalid sequence");
+            }
+            blockSize = (responseLength - response.size() > packetSize - 5 ? packetSize - 5 : responseLength - response.size());
+            if (blockSize > data.length - offset) {
+                return null;
+            }
+            response.write(data, offset, blockSize);
+            offset += blockSize;
+        }
+        return response.toByteArray();
+    }
+
+}

app/src/main/java/com/btchip/comm/android/BTChipTransportAndroidHID.java

@@ -0,0 +1,149 @@
+/*
+ *******************************************************************************
+ *   BTChip Bitcoin Hardware Wallet Java API
+ *   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
+ *   (c) 2018 m2049r
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *   limitations under the License.
+ ********************************************************************************
+ */
+
+package com.btchip.comm.android;
+
+import android.hardware.usb.UsbConstants;
+import android.hardware.usb.UsbDevice;
+import android.hardware.usb.UsbDeviceConnection;
+import android.hardware.usb.UsbEndpoint;
+import android.hardware.usb.UsbInterface;
+import android.hardware.usb.UsbManager;
+import android.hardware.usb.UsbRequest;
+
+import com.btchip.BTChipException;
+import com.btchip.comm.BTChipTransport;
+import com.btchip.comm.LedgerHelper;
+import com.btchip.utils.Dump;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.HashMap;
+
+import timber.log.Timber;
+
+public class BTChipTransportAndroidHID implements BTChipTransport {
+
+    public static UsbDevice getDevice(UsbManager manager) {
+        HashMap<String, UsbDevice> deviceList = manager.getDeviceList();
+        for (UsbDevice device : deviceList.values()) {
+            Timber.d("%04X:%04X %s, %s", device.getVendorId(), device.getProductId(), device.getManufacturerName(), device.getProductName());
+            if (device.getVendorId() == VID) {
+                final int deviceProductId = device.getProductId();
+                for (int pid : PID_HIDS) {
+                    if (deviceProductId == pid)
+                        return device;
+                }
+            }
+        }
+        return null;
+    }
+
+    public static BTChipTransport open(UsbManager manager, UsbDevice device) throws IOException {
+        UsbDeviceConnection connection = manager.openDevice(device);
+        if (connection == null) throw new IOException("Device not connected");
+        // Must only be called once permission is granted (see http://developer.android.com/reference/android/hardware/usb/UsbManager.html)
+        // Important if enumerating, rather than being awaken by the intent notification
+        UsbInterface dongleInterface = device.getInterface(0);
+        UsbEndpoint in = null;
+        UsbEndpoint out = null;
+        for (int i = 0; i < dongleInterface.getEndpointCount(); i++) {
+            UsbEndpoint tmpEndpoint = dongleInterface.getEndpoint(i);
+            if (tmpEndpoint.getDirection() == UsbConstants.USB_DIR_IN) {
+                in = tmpEndpoint;
+            } else {
+                out = tmpEndpoint;
+            }
+        }
+        connection.claimInterface(dongleInterface, true);
+        return new BTChipTransportAndroidHID(connection, dongleInterface, in, out);
+    }
+
+    private static final int VID = 0x2C97;
+    private static final int[] PID_HIDS = {0x0001, 0x0004, 0x0005};
+
+    private UsbDeviceConnection connection;
+    private UsbInterface dongleInterface;
+    private UsbEndpoint in;
+    private UsbEndpoint out;
+    private byte transferBuffer[];
+    private boolean debug;
+
+    public BTChipTransportAndroidHID(UsbDeviceConnection connection, UsbInterface dongleInterface, UsbEndpoint in, UsbEndpoint out) {
+        this.connection = connection;
+        this.dongleInterface = dongleInterface;
+        this.in = in;
+        this.out = out;
+        transferBuffer = new byte[HID_BUFFER_SIZE];
+    }
+
+    @Override
+    public byte[] exchange(byte[] command) {
+        ByteArrayOutputStream response = new ByteArrayOutputStream();
+        byte[] responseData = null;
+        int offset = 0;
+        if (debug) {
+            Timber.d("=> %s", Dump.dump(command));
+        }
+        command = LedgerHelper.wrapCommandAPDU(LEDGER_DEFAULT_CHANNEL, command, HID_BUFFER_SIZE);
+        UsbRequest requestOut = new UsbRequest();
+        requestOut.initialize(connection, out);
+        while (offset != command.length) {
+            int blockSize = (command.length - offset > HID_BUFFER_SIZE ? HID_BUFFER_SIZE : command.length - offset);
+            System.arraycopy(command, offset, transferBuffer, 0, blockSize);
+            requestOut.queue(ByteBuffer.wrap(transferBuffer), HID_BUFFER_SIZE);
+            connection.requestWait();
+            offset += blockSize;
+        }
+        requestOut.close();
+        ByteBuffer responseBuffer = ByteBuffer.allocate(HID_BUFFER_SIZE);
+        UsbRequest requestIn = new UsbRequest();
+        requestIn.initialize(connection, in);
+        while ((responseData = LedgerHelper.unwrapResponseAPDU(LEDGER_DEFAULT_CHANNEL, response.toByteArray(), HID_BUFFER_SIZE)) == null) {
+            responseBuffer.clear();
+            requestIn.queue(responseBuffer, HID_BUFFER_SIZE);
+            connection.requestWait();
+            responseBuffer.rewind();
+            responseBuffer.get(transferBuffer, 0, HID_BUFFER_SIZE);
+            response.write(transferBuffer, 0, HID_BUFFER_SIZE);
+        }
+        requestIn.close();
+        if (debug) {
+            Timber.d("<= %s", Dump.dump(responseData));
+        }
+        return responseData;
+    }
+
+    @Override
+    public void close() {
+        connection.releaseInterface(dongleInterface);
+        connection.close();
+    }
+
+    @Override
+    public void setDebug(boolean debugFlag) {
+        this.debug = debugFlag;
+    }
+
+    private static final int HID_BUFFER_SIZE = 64;
+    private static final int LEDGER_DEFAULT_CHANNEL = 1;
+    private static final int SW1_DATA_AVAILABLE = 0x61;
+}

app/src/main/java/com/btchip/utils/Dump.java

@@ -0,0 +1,62 @@
+/*
+ *******************************************************************************
+ *   BTChip Bitcoin Hardware Wallet Java API
+ *   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *   limitations under the License.
+ ********************************************************************************
+ */
+
+package com.btchip.utils;
+
+import java.io.ByteArrayOutputStream;
+
+public class Dump {
+
+    public static String dump(byte[] buffer, int offset, int length) {
+        String result = "";
+        for (int i = 0; i < length; i++) {
+            String temp = Integer.toHexString((buffer[offset + i]) & 0xff);
+            if (temp.length() < 2) {
+                temp = "0" + temp;
+            }
+            result += temp;
+        }
+        return result;
+    }
+
+    public static String dump(byte[] buffer) {
+        return dump(buffer, 0, buffer.length);
+    }
+
+    public static byte[] hexToBin(String src) {
+        ByteArrayOutputStream result = new ByteArrayOutputStream();
+        int i = 0;
+        while (i < src.length()) {
+            char x = src.charAt(i);
+            if (!((x >= '0' && x <= '9') || (x >= 'A' && x <= 'F') || (x >= 'a' && x <= 'f'))) {
+                i++;
+                continue;
+            }
+            try {
+                result.write(Integer.valueOf("" + src.charAt(i) + src.charAt(i + 1), 16));
+                i += 2;
+            } catch (Exception e) {
+                return null;
+            }
+        }
+        return result.toByteArray();
+    }
+
+
+}

app/src/main/java/com/m2049r/levin/data/Bucket.java

@@ -0,0 +1,145 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.data;
+
+import com.m2049r.levin.util.HexHelper;
+import com.m2049r.levin.util.LevinReader;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+
+public class Bucket {
+
+    // constants copied from monero p2p & epee
+
+    public final static int P2P_COMMANDS_POOL_BASE = 1000;
+    public final static int COMMAND_HANDSHAKE_ID = P2P_COMMANDS_POOL_BASE + 1;
+    public final static int COMMAND_TIMED_SYNC_ID = P2P_COMMANDS_POOL_BASE + 2;
+    public final static int COMMAND_PING_ID = P2P_COMMANDS_POOL_BASE + 3;
+    public final static int COMMAND_REQUEST_STAT_INFO_ID = P2P_COMMANDS_POOL_BASE + 4;
+    public final static int COMMAND_REQUEST_NETWORK_STATE_ID = P2P_COMMANDS_POOL_BASE + 5;
+    public final static int COMMAND_REQUEST_PEER_ID_ID = P2P_COMMANDS_POOL_BASE + 6;
+    public final static int COMMAND_REQUEST_SUPPORT_FLAGS_ID = P2P_COMMANDS_POOL_BASE + 7;
+
+    public final static long LEVIN_SIGNATURE = 0x0101010101012101L; // Bender's nightmare
+
+    public final static long LEVIN_DEFAULT_MAX_PACKET_SIZE = 100000000; // 100MB by default
+
+    public final static int LEVIN_PACKET_REQUEST = 0x00000001;
+    public final static int LEVIN_PACKET_RESPONSE = 0x00000002;
+
+    public final static int LEVIN_PROTOCOL_VER_0 = 0;
+    public final static int LEVIN_PROTOCOL_VER_1 = 1;
+
+    public final static int LEVIN_OK = 0;
+    public final static int LEVIN_ERROR_CONNECTION = -1;
+    public final static int LEVIN_ERROR_CONNECTION_NOT_FOUND = -2;
+    public final static int LEVIN_ERROR_CONNECTION_DESTROYED = -3;
+    public final static int LEVIN_ERROR_CONNECTION_TIMEDOUT = -4;
+    public final static int LEVIN_ERROR_CONNECTION_NO_DUPLEX_PROTOCOL = -5;
+    public final static int LEVIN_ERROR_CONNECTION_HANDLER_NOT_DEFINED = -6;
+    public final static int LEVIN_ERROR_FORMAT = -7;
+
+    public final static int P2P_SUPPORT_FLAG_FLUFFY_BLOCKS = 0x01;
+    public final static int P2P_SUPPORT_FLAGS = P2P_SUPPORT_FLAG_FLUFFY_BLOCKS;
+
+    final private long signature;
+    final private long cb;
+    final public boolean haveToReturnData;
+    final public int command;
+    final public int returnCode;
+    final private int flags;
+    final private int protcolVersion;
+    final byte[] payload;
+
+    final public Section payloadSection;
+
+    // create a request
+    public Bucket(int command, byte[] payload) throws IOException {
+        this.signature = LEVIN_SIGNATURE;
+        this.cb = payload.length;
+        this.haveToReturnData = true;
+        this.command = command;
+        this.returnCode = 0;
+        this.flags = LEVIN_PACKET_REQUEST;
+        this.protcolVersion = LEVIN_PROTOCOL_VER_1;
+        this.payload = payload;
+        payloadSection = LevinReader.readPayload(payload);
+    }
+
+    // create a response
+    public Bucket(int command, byte[] payload, int rc) throws IOException {
+        this.signature = LEVIN_SIGNATURE;
+        this.cb = payload.length;
+        this.haveToReturnData = false;
+        this.command = command;
+        this.returnCode = rc;
+        this.flags = LEVIN_PACKET_RESPONSE;
+        this.protcolVersion = LEVIN_PROTOCOL_VER_1;
+        this.payload = payload;
+        payloadSection = LevinReader.readPayload(payload);
+    }
+
+    public Bucket(DataInput in) throws IOException {
+        signature = in.readLong();
+        cb = in.readLong();
+        haveToReturnData = in.readBoolean();
+        command = in.readInt();
+        returnCode = in.readInt();
+        flags = in.readInt();
+        protcolVersion = in.readInt();
+
+        if (signature == Bucket.LEVIN_SIGNATURE) {
+            if (cb > Integer.MAX_VALUE)
+                throw new IllegalArgumentException();
+            payload = new byte[(int) cb];
+            in.readFully(payload);
+        } else
+            throw new IllegalStateException();
+        payloadSection = LevinReader.readPayload(payload);
+    }
+
+    public Section getPayloadSection() {
+        return payloadSection;
+    }
+
+    public void send(DataOutput out) throws IOException {
+        out.writeLong(signature);
+        out.writeLong(cb);
+        out.writeBoolean(haveToReturnData);
+        out.writeInt(command);
+        out.writeInt(returnCode);
+        out.writeInt(flags);
+        out.writeInt(protcolVersion);
+        out.write(payload);
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("sig:  ").append(signature).append("\n");
+        sb.append("cb:   ").append(cb).append("\n");
+        sb.append("call: ").append(haveToReturnData).append("\n");
+        sb.append("cmd:  ").append(command).append("\n");
+        sb.append("rc:   ").append(returnCode).append("\n");
+        sb.append("flags:").append(flags).append("\n");
+        sb.append("proto:").append(protcolVersion).append("\n");
+        sb.append(HexHelper.bytesToHex(payload)).append("\n");
+        sb.append(payloadSection.toString());
+        return sb.toString();
+    }
+}

app/src/main/java/com/m2049r/levin/data/Section.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.data;
+
+import com.m2049r.levin.util.HexHelper;
+import com.m2049r.levin.util.LevinReader;
+import com.m2049r.levin.util.LevinWriter;
+import com.m2049r.levin.util.LittleEndianDataOutputStream;
+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class Section {
+
+    // constants copied from monero p2p & epee
+
+    static final public int PORTABLE_STORAGE_SIGNATUREA = 0x01011101;
+    static final public int PORTABLE_STORAGE_SIGNATUREB = 0x01020101;
+
+    static final public byte PORTABLE_STORAGE_FORMAT_VER = 1;
+
+    static final public byte PORTABLE_RAW_SIZE_MARK_MASK = 0x03;
+    static final public byte PORTABLE_RAW_SIZE_MARK_BYTE = 0;
+    static final public byte PORTABLE_RAW_SIZE_MARK_WORD = 1;
+    static final public byte PORTABLE_RAW_SIZE_MARK_DWORD = 2;
+    static final public byte PORTABLE_RAW_SIZE_MARK_INT64 = 3;
+
+    static final long MAX_STRING_LEN_POSSIBLE = 2000000000; // do not let string be so big
+
+    // data types
+    static final public byte SERIALIZE_TYPE_INT64 = 1;
+    static final public byte SERIALIZE_TYPE_INT32 = 2;
+    static final public byte SERIALIZE_TYPE_INT16 = 3;
+    static final public byte SERIALIZE_TYPE_INT8 = 4;
+    static final public byte SERIALIZE_TYPE_UINT64 = 5;
+    static final public byte SERIALIZE_TYPE_UINT32 = 6;
+    static final public byte SERIALIZE_TYPE_UINT16 = 7;
+    static final public byte SERIALIZE_TYPE_UINT8 = 8;
+    static final public byte SERIALIZE_TYPE_DUOBLE = 9;
+    static final public byte SERIALIZE_TYPE_STRING = 10;
+    static final public byte SERIALIZE_TYPE_BOOL = 11;
+    static final public byte SERIALIZE_TYPE_OBJECT = 12;
+    static final public byte SERIALIZE_TYPE_ARRAY = 13;
+
+    static final public byte SERIALIZE_FLAG_ARRAY = (byte) 0x80;
+
+    private final Map<String, Object> entries = new HashMap<String, Object>();
+
+    public void add(String key, Object entry) {
+        entries.put(key, entry);
+    }
+
+    public int size() {
+        return entries.size();
+    }
+
+    public Set<Map.Entry<String, Object>> entrySet() {
+        return entries.entrySet();
+    }
+
+    public Object get(String key) {
+        return entries.get(key);
+    }
+
+    public String toString() {
+        final StringBuilder sb = new StringBuilder();
+        sb.append("\n");
+        for (Map.Entry<String, Object> entry : entries.entrySet()) {
+            sb.append(entry.getKey()).append("=");
+            final Object value = entry.getValue();
+            if (value instanceof List) {
+                @SuppressWarnings("unchecked") final List<Object> list = (List<Object>) value;
+                for (Object listEntry : list) {
+                    sb.append(listEntry.toString()).append("\n");
+                }
+            } else if (value instanceof String) {
+                sb.append("(").append(value).append(")\n");
+            } else if (value instanceof byte[]) {
+                sb.append(HexHelper.bytesToHex((byte[]) value)).append("\n");
+            } else {
+                sb.append(value.toString()).append("\n");
+            }
+        }
+        return sb.toString();
+    }
+
+    static public Section fromByteArray(byte[] buffer) {
+        try {
+            return LevinReader.readPayload(buffer);
+        } catch (IOException ex) {
+            throw new IllegalStateException();
+        }
+    }
+
+    public byte[] asByteArray() {
+        try {
+            ByteArrayOutputStream bas = new ByteArrayOutputStream();
+            DataOutput out = new LittleEndianDataOutputStream(bas);
+            LevinWriter writer = new LevinWriter(out);
+            writer.writePayload(this);
+            return bas.toByteArray();
+        } catch (IOException ex) {
+            throw new IllegalStateException();
+        }
+    }
+}

app/src/main/java/com/m2049r/levin/scanner/Dispatcher.java

@@ -0,0 +1,195 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.scanner;
+
+import com.m2049r.xmrwallet.data.NodeInfo;
+
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.concurrent.ConcurrentLinkedDeque;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import timber.log.Timber;
+
+public class Dispatcher implements PeerRetriever.OnGetPeers {
+    static final public int NUM_THREADS = 50;
+    static final public int MAX_PEERS = 1000;
+    static final public long MAX_TIME = 30000000000L; //30 seconds
+
+    private int peerCount = 0;
+    final private Set<NodeInfo> knownNodes = new HashSet<>(); // set of nodes to test
+    final private Set<NodeInfo> rpcNodes = new HashSet<>(); // set of RPC nodes we like
+    final private ExecutorService exeService = Executors.newFixedThreadPool(NUM_THREADS);
+
+    public interface Listener {
+        void onGet(NodeInfo nodeInfo);
+    }
+
+    private Listener listener;
+
+    public Dispatcher(Listener listener) {
+        this.listener = listener;
+    }
+
+    public Set<NodeInfo> getRpcNodes() {
+        return rpcNodes;
+    }
+
+    public int getPeerCount() {
+        return peerCount;
+    }
+
+    public boolean getMorePeers() {
+        return peerCount < MAX_PEERS;
+    }
+
+    public void awaitTermination(int nodesToFind) {
+        try {
+            final long t = System.nanoTime();
+            while (!jobs.isEmpty()) {
+                try {
+                    Timber.d("Remaining jobs %d", jobs.size());
+                    final PeerRetriever retrievedPeer = jobs.poll().get();
+                    if (retrievedPeer.isGood() && getMorePeers())
+                        retrievePeers(retrievedPeer);
+                    final NodeInfo nodeInfo = retrievedPeer.getNodeInfo();
+                    Timber.d("Retrieved %s", nodeInfo);
+                    if ((nodeInfo.isValid() || nodeInfo.isFavourite())) {
+                        nodeInfo.setDefaultName();
+                        rpcNodes.add(nodeInfo);
+                        Timber.d("RPC: %s", nodeInfo);
+                        // the following is not totally correct but it works (otherwise we need to
+                        // load much more before filtering - but we don't have time
+                        if (listener != null) listener.onGet(nodeInfo);
+                        if (rpcNodes.size() >= nodesToFind) {
+                            Timber.d("are we done here?");
+                            filterRpcNodes();
+                            if (rpcNodes.size() >= nodesToFind) {
+                                Timber.d("we're done here");
+                                break;
+                            }
+                        }
+                    }
+                    if (System.nanoTime() - t > MAX_TIME) break; // watchdog
+                } catch (ExecutionException ex) {
+                    Timber.d(ex); // tell us about it and continue
+                }
+            }
+        } catch (InterruptedException ex) {
+            Timber.d(ex);
+        } finally {
+            Timber.d("Shutting down!");
+            exeService.shutdownNow();
+            try {
+                exeService.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS);
+            } catch (InterruptedException ex) {
+                Timber.d(ex);
+            }
+        }
+        filterRpcNodes();
+    }
+
+    static final public int HEIGHT_WINDOW = 1;
+
+    private boolean testHeight(long height, long consensus) {
+        return (height >= (consensus - HEIGHT_WINDOW))
+                && (height <= (consensus + HEIGHT_WINDOW));
+    }
+
+    private long calcConsensusHeight() {
+        Timber.d("Calc Consensus height from %d nodes", rpcNodes.size());
+        final Map<Long, Integer> nodeHeights = new TreeMap<Long, Integer>();
+        for (NodeInfo info : rpcNodes) {
+            if (!info.isValid()) continue;
+            Integer h = nodeHeights.get(info.getHeight());
+            if (h == null)
+                h = 0;
+            nodeHeights.put(info.getHeight(), h + 1);
+        }
+        long consensusHeight = 0;
+        long consensusCount = 0;
+        for (Map.Entry<Long, Integer> entry : nodeHeights.entrySet()) {
+            final long entryHeight = entry.getKey();
+            int count = 0;
+            for (long i = entryHeight - HEIGHT_WINDOW; i <= entryHeight + HEIGHT_WINDOW; i++) {
+                Integer v = nodeHeights.get(i);
+                if (v == null)
+                    v = 0;
+                count += v;
+            }
+            if (count >= consensusCount) {
+                consensusCount = count;
+                consensusHeight = entryHeight;
+            }
+            Timber.d("%d - %d/%d", entryHeight, count, entry.getValue());
+        }
+        return consensusHeight;
+    }
+
+    private void filterRpcNodes() {
+        long consensus = calcConsensusHeight();
+        Timber.d("Consensus Height = %d for %d nodes", consensus, rpcNodes.size());
+        for (Iterator<NodeInfo> iter = rpcNodes.iterator(); iter.hasNext(); ) {
+            NodeInfo info = iter.next();
+            // don't remove favourites
+            if (!info.isFavourite()) {
+                if (!testHeight(info.getHeight(), consensus)) {
+                    iter.remove();
+                    Timber.d("Removed %s", info);
+                }
+            }
+        }
+    }
+
+    // TODO: does this NEED to be a ConcurrentLinkedDeque?
+    private ConcurrentLinkedDeque<Future<PeerRetriever>> jobs = new ConcurrentLinkedDeque<>();
+
+    private void retrievePeer(NodeInfo nodeInfo) {
+        if (knownNodes.add(nodeInfo)) {
+            Timber.d("\t%d:%s", knownNodes.size(), nodeInfo);
+            jobs.add(exeService.submit(new PeerRetriever(nodeInfo, this)));
+            peerCount++; // jobs.size() does not perform well
+        }
+    }
+
+    private void retrievePeers(PeerRetriever peer) {
+        for (LevinPeer levinPeer : peer.getPeers()) {
+            if (getMorePeers())
+                retrievePeer(new NodeInfo(levinPeer));
+            else
+                break;
+        }
+    }
+
+    public void seedPeers(Collection<NodeInfo> seedNodes) {
+        for (NodeInfo node : seedNodes) {
+            if (node.isFavourite()) {
+                rpcNodes.add(node);
+                if (listener != null) listener.onGet(node);
+            }
+            retrievePeer(node);
+        }
+    }
+}

app/src/main/java/com/m2049r/levin/scanner/LevinPeer.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.scanner;
+
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+
+public class LevinPeer {
+    final public InetSocketAddress socketAddress;
+    final public int version;
+    final public long height;
+    final public String top;
+
+
+    public InetSocketAddress getSocketAddress() {
+        return socketAddress;
+    }
+
+    LevinPeer(InetAddress address, int port, int version, long height, String top) {
+        this.socketAddress = new InetSocketAddress(address, port);
+        this.version = version;
+        this.height = height;
+        this.top = top;
+    }
+}

app/src/main/java/com/m2049r/levin/scanner/PeerRetriever.java

@@ -0,0 +1,231 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.scanner;
+
+import com.m2049r.levin.data.Bucket;
+import com.m2049r.levin.data.Section;
+import com.m2049r.levin.util.HexHelper;
+import com.m2049r.levin.util.LittleEndianDataInputStream;
+import com.m2049r.levin.util.LittleEndianDataOutputStream;
+import com.m2049r.xmrwallet.data.NodeInfo;
+import com.m2049r.xmrwallet.util.Helper;
+
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.net.InetAddress;
+import java.net.Socket;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.Callable;
+
+import timber.log.Timber;
+
+public class PeerRetriever implements Callable<PeerRetriever> {
+    static final public int CONNECT_TIMEOUT = 500; //ms
+    static final public int SOCKET_TIMEOUT = 500; //ms
+    static final public long PEER_ID = new Random().nextLong();
+    static final private byte[] HANDSHAKE = handshakeRequest().asByteArray();
+    static final private byte[] FLAGS_RESP = flagsResponse().asByteArray();
+
+    final private List<LevinPeer> peers = new ArrayList<>();
+
+    private NodeInfo nodeInfo;
+    private OnGetPeers onGetPeersCallback;
+
+    public interface OnGetPeers {
+        boolean getMorePeers();
+    }
+
+    public PeerRetriever(NodeInfo nodeInfo, OnGetPeers onGetPeers) {
+        this.nodeInfo = nodeInfo;
+        this.onGetPeersCallback = onGetPeers;
+    }
+
+    public NodeInfo getNodeInfo() {
+        return nodeInfo;
+    }
+
+    public boolean isGood() {
+        return !peers.isEmpty();
+    }
+
+    public List<LevinPeer> getPeers() {
+        return peers;
+    }
+
+    public PeerRetriever call() {
+        if (isGood()) // we have already been called?
+            throw new IllegalStateException();
+        // first check for an rpc service
+        nodeInfo.findRpcService();
+        if (onGetPeersCallback.getMorePeers())
+            try {
+                Timber.d("%s CONN", nodeInfo.getLevinSocketAddress());
+                if (!connect())
+                    return this;
+                Bucket handshakeBucket = new Bucket(Bucket.COMMAND_HANDSHAKE_ID, HANDSHAKE);
+                handshakeBucket.send(getDataOutput());
+
+                while (true) {// wait for response (which may never come)
+                    Bucket recv = new Bucket(getDataInput()); // times out after SOCKET_TIMEOUT
+                    if ((recv.command == Bucket.COMMAND_HANDSHAKE_ID)
+                            && (!recv.haveToReturnData)) {
+                        readAddressList(recv.payloadSection);
+                        return this;
+                    } else if ((recv.command == Bucket.COMMAND_REQUEST_SUPPORT_FLAGS_ID)
+                            && (recv.haveToReturnData)) {
+                        Bucket flagsBucket = new Bucket(Bucket.COMMAND_REQUEST_SUPPORT_FLAGS_ID, FLAGS_RESP, 1);
+                        flagsBucket.send(getDataOutput());
+                    } else {// and ignore others
+                        Timber.d("Ignored LEVIN COMMAND %d", recv.command);
+                    }
+                }
+            } catch (IOException ex) {
+            } finally {
+                disconnect(); // we have what we want - byebye
+                Timber.d("%s DISCONN", nodeInfo.getLevinSocketAddress());
+            }
+        return this;
+    }
+
+    private void readAddressList(Section section) {
+        Section data = (Section) section.get("payload_data");
+        int topVersion = (Integer) data.get("top_version");
+        long currentHeight = (Long) data.get("current_height");
+        String topId = HexHelper.bytesToHex((byte[]) data.get("top_id"));
+        Timber.d("PAYLOAD_DATA %d/%d/%s", topVersion, currentHeight, topId);
+
+        @SuppressWarnings("unchecked")
+        List<Section> peerList = (List<Section>) section.get("local_peerlist_new");
+        if (peerList != null) {
+            for (Section peer : peerList) {
+                Section adr = (Section) peer.get("adr");
+                Integer type = (Integer) adr.get("type");
+                if ((type == null) || (type != 1))
+                    continue;
+                Section addr = (Section) adr.get("addr");
+                if (addr == null)
+                    continue;
+                Integer ip = (Integer) addr.get("m_ip");
+                if (ip == null)
+                    continue;
+                Integer sport = (Integer) addr.get("m_port");
+                if (sport == null)
+                    continue;
+                int port = sport;
+                if (port < 0) // port is unsigned
+                    port = port + 0x10000;
+                InetAddress inet = HexHelper.toInetAddress(ip);
+                // make sure this is an address we want to talk to (i.e. a remote address)
+                if (!inet.isSiteLocalAddress() && !inet.isAnyLocalAddress()
+                        && !inet.isLoopbackAddress()
+                        && !inet.isMulticastAddress()
+                        && !inet.isLinkLocalAddress()) {
+                    peers.add(new LevinPeer(inet, port, topVersion, currentHeight, topId));
+                }
+            }
+        }
+    }
+
+    private Socket socket = null;
+
+    private boolean connect() {
+        if (socket != null) throw new IllegalStateException();
+        try {
+            socket = new Socket();
+            socket.connect(nodeInfo.getLevinSocketAddress(), CONNECT_TIMEOUT);
+            socket.setSoTimeout(SOCKET_TIMEOUT);
+        } catch (IOException ex) {
+            //Timber.d(ex);
+            return false;
+        }
+        return true;
+    }
+
+    private boolean isConnected() {
+        return socket.isConnected();
+    }
+
+    private void disconnect() {
+        try {
+            dataInput = null;
+            dataOutput = null;
+            if ((socket != null) && (!socket.isClosed())) {
+                socket.close();
+            }
+        } catch (IOException ex) {
+            Timber.d(ex);
+        } finally {
+            socket = null;
+        }
+    }
+
+    private DataOutput dataOutput = null;
+
+    private DataOutput getDataOutput() throws IOException {
+        if (dataOutput == null)
+            synchronized (this) {
+                if (dataOutput == null)
+                    dataOutput = new LittleEndianDataOutputStream(
+                            socket.getOutputStream());
+            }
+        return dataOutput;
+    }
+
+    private DataInput dataInput = null;
+
+    private DataInput getDataInput() throws IOException {
+        if (dataInput == null)
+            synchronized (this) {
+                if (dataInput == null)
+                    dataInput = new LittleEndianDataInputStream(
+                            socket.getInputStream());
+            }
+        return dataInput;
+    }
+
+    static private Section handshakeRequest() {
+        Section section = new Section(); // root object
+
+        Section nodeData = new Section();
+        nodeData.add("local_time", (new Date()).getTime());
+        nodeData.add("my_port", 0);
+        byte[] networkId = Helper.hexToBytes("1230f171610441611731008216a1a110"); // mainnet
+        nodeData.add("network_id", networkId);
+        nodeData.add("peer_id", PEER_ID);
+        section.add("node_data", nodeData);
+
+        Section payloadData = new Section();
+        payloadData.add("cumulative_difficulty", 1L);
+        payloadData.add("current_height", 1L);
+        byte[] genesisHash =
+                Helper.hexToBytes("418015bb9ae982a1975da7d79277c2705727a56894ba0fb246adaabb1f4632e3");
+        payloadData.add("top_id", genesisHash);
+        payloadData.add("top_version", (byte) 1);
+        section.add("payload_data", payloadData);
+        return section;
+    }
+
+    static private Section flagsResponse() {
+        Section section = new Section(); // root object
+        section.add("support_flags", Bucket.P2P_SUPPORT_FLAGS);
+        return section;
+    }
+}

app/src/main/java/com/m2049r/levin/util/HexHelper.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.util;
+
+import java.math.BigInteger;
+import java.net.InetAddress;
+import java.net.UnknownHostException;
+
+public class HexHelper {
+
+    static public String bytesToHex(byte[] data) {
+        if ((data != null) && (data.length > 0))
+            return String.format("%0" + (data.length * 2) + "X",
+                    new BigInteger(1, data));
+        else
+            return "";
+    }
+
+    static public InetAddress toInetAddress(int ip) {
+        try {
+            String ipAddress = String.format("%d.%d.%d.%d", (ip & 0xff),
+                    (ip >> 8 & 0xff), (ip >> 16 & 0xff), (ip >> 24 & 0xff));
+            return InetAddress.getByName(ipAddress);
+        } catch (UnknownHostException ex) {
+            throw new IllegalArgumentException(ex);
+        }
+    }
+}

app/src/main/java/com/m2049r/levin/util/LevinReader.java

@@ -0,0 +1,184 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.util;
+
+import com.m2049r.levin.data.Section;
+
+import java.io.ByteArrayInputStream;
+import java.io.DataInput;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+
+// Full Levin reader as seen on epee
+
+public class LevinReader {
+    private DataInput in;
+
+    private LevinReader(byte[] buffer) {
+        ByteArrayInputStream bis = new ByteArrayInputStream(buffer);
+        in = new LittleEndianDataInputStream(bis);
+    }
+
+    static public Section readPayload(byte[] payload) throws IOException {
+        LevinReader r = new LevinReader(payload);
+        return r.readPayload();
+    }
+
+    private Section readPayload() throws IOException {
+        if (in.readInt() != Section.PORTABLE_STORAGE_SIGNATUREA)
+            throw new IllegalStateException();
+        if (in.readInt() != Section.PORTABLE_STORAGE_SIGNATUREB)
+            throw new IllegalStateException();
+        if (in.readByte() != Section.PORTABLE_STORAGE_FORMAT_VER)
+            throw new IllegalStateException();
+        return readSection();
+    }
+
+    private Section readSection() throws IOException {
+        Section section = new Section();
+        long count = readVarint();
+        while (count-- > 0) {
+            // read section name string
+            String sectionName = readSectionName();
+            section.add(sectionName, loadStorageEntry());
+        }
+        return section;
+    }
+
+    private Object loadStorageArrayEntry(int type) throws IOException {
+        type &= ~Section.SERIALIZE_FLAG_ARRAY;
+        return readArrayEntry(type);
+    }
+
+    private List<Object> readArrayEntry(int type) throws IOException {
+        List<Object> list = new ArrayList<Object>();
+        long size = readVarint();
+        while (size-- > 0)
+            list.add(read(type));
+        return list;
+    }
+
+    private Object read(int type) throws IOException {
+        switch (type) {
+            case Section.SERIALIZE_TYPE_UINT64:
+            case Section.SERIALIZE_TYPE_INT64:
+                return in.readLong();
+            case Section.SERIALIZE_TYPE_UINT32:
+            case Section.SERIALIZE_TYPE_INT32:
+                return in.readInt();
+            case Section.SERIALIZE_TYPE_UINT16:
+                return in.readUnsignedShort();
+            case Section.SERIALIZE_TYPE_INT16:
+                return in.readShort();
+            case Section.SERIALIZE_TYPE_UINT8:
+                return in.readUnsignedByte();
+            case Section.SERIALIZE_TYPE_INT8:
+                return in.readByte();
+            case Section.SERIALIZE_TYPE_OBJECT:
+                return readSection();
+            case Section.SERIALIZE_TYPE_STRING:
+                return readByteArray();
+            default:
+                throw new IllegalArgumentException("type " + type
+                        + " not supported");
+        }
+    }
+
+    private Object loadStorageEntry() throws IOException {
+        int type = in.readUnsignedByte();
+        if ((type & Section.SERIALIZE_FLAG_ARRAY) != 0)
+            return loadStorageArrayEntry(type);
+        if (type == Section.SERIALIZE_TYPE_ARRAY)
+            return readStorageEntryArrayEntry();
+        else
+            return readStorageEntry(type);
+    }
+
+    private Object readStorageEntry(int type) throws IOException {
+        return read(type);
+    }
+
+    private Object readStorageEntryArrayEntry() throws IOException {
+        int type = in.readUnsignedByte();
+        if ((type & Section.SERIALIZE_FLAG_ARRAY) != 0)
+            throw new IllegalStateException("wrong type sequences");
+        return loadStorageArrayEntry(type);
+    }
+
+    private String readSectionName() throws IOException {
+        int nameLen = in.readUnsignedByte();
+        return readString(nameLen);
+    }
+
+    private byte[] read(long count) throws IOException {
+        if (count > Integer.MAX_VALUE)
+            throw new IllegalArgumentException();
+        int len = (int) count;
+        final byte buffer[] = new byte[len];
+        in.readFully(buffer);
+        return buffer;
+    }
+
+    private String readString(long count) throws IOException {
+        return new String(read(count), StandardCharsets.US_ASCII);
+    }
+
+    private byte[] readByteArray(long count) throws IOException {
+        return read(count);
+    }
+
+    private byte[] readByteArray() throws IOException {
+        long len = readVarint();
+        return readByteArray(len);
+    }
+
+    private long readVarint() throws IOException {
+        long v = 0;
+        int b = in.readUnsignedByte();
+        int sizeMask = b & Section.PORTABLE_RAW_SIZE_MARK_MASK;
+        switch (sizeMask) {
+            case Section.PORTABLE_RAW_SIZE_MARK_BYTE:
+                v = b >>> 2;
+                break;
+            case Section.PORTABLE_RAW_SIZE_MARK_WORD:
+                v = readRest(b, 1) >>> 2;
+                break;
+            case Section.PORTABLE_RAW_SIZE_MARK_DWORD:
+                v = readRest(b, 3) >>> 2;
+                break;
+            case Section.PORTABLE_RAW_SIZE_MARK_INT64:
+                v = readRest(b, 7) >>> 2;
+                break;
+            default:
+                throw new IllegalStateException();
+        }
+        return v;
+    }
+
+    // this should be in LittleEndianDataInputStream because it has little
+    // endian logic
+    private long readRest(final int firstByte, final int bytes) throws IOException {
+        long result = firstByte;
+        for (int i = 1; i < bytes + 1; i++) {
+            result = result + (((long) in.readUnsignedByte()) << (8 * i));
+        }
+        return result;
+    }
+
+}

app/src/main/java/com/m2049r/levin/util/LevinWriter.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.util;
+
+import com.m2049r.levin.data.Section;
+
+import java.io.DataOutput;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+
+// a simplified Levin Writer WITHOUT support for arrays
+
+public class LevinWriter {
+    private DataOutput out;
+
+    public LevinWriter(DataOutput out) {
+        this.out = out;
+    }
+
+    public void writePayload(Section section) throws IOException {
+        out.writeInt(Section.PORTABLE_STORAGE_SIGNATUREA);
+        out.writeInt(Section.PORTABLE_STORAGE_SIGNATUREB);
+        out.writeByte(Section.PORTABLE_STORAGE_FORMAT_VER);
+        putSection(section);
+    }
+
+    private void writeSection(Section section) throws IOException {
+        out.writeByte(Section.SERIALIZE_TYPE_OBJECT);
+        putSection(section);
+    }
+
+    private void putSection(Section section) throws IOException {
+        writeVarint(section.size());
+        for (Map.Entry<String, Object> kv : section.entrySet()) {
+            byte[] key = kv.getKey().getBytes(StandardCharsets.US_ASCII);
+            out.writeByte(key.length);
+            out.write(key);
+            write(kv.getValue());
+        }
+    }
+
+    private void writeVarint(long i) throws IOException {
+        if (i <= 63) {
+            out.writeByte(((int) i << 2) | Section.PORTABLE_RAW_SIZE_MARK_BYTE);
+        } else if (i <= 16383) {
+            out.writeShort(((int) i << 2) | Section.PORTABLE_RAW_SIZE_MARK_WORD);
+        } else if (i <= 1073741823) {
+            out.writeInt(((int) i << 2) | Section.PORTABLE_RAW_SIZE_MARK_DWORD);
+        } else {
+            if (i > 4611686018427387903L)
+                throw new IllegalArgumentException();
+            out.writeLong((i << 2) | Section.PORTABLE_RAW_SIZE_MARK_INT64);
+        }
+    }
+
+    private void write(Object object) throws IOException {
+        if (object instanceof byte[]) {
+            byte[] value = (byte[]) object;
+            out.writeByte(Section.SERIALIZE_TYPE_STRING);
+            writeVarint(value.length);
+            out.write(value);
+        } else if (object instanceof String) {
+            byte[] value = ((String) object)
+                    .getBytes(StandardCharsets.US_ASCII);
+            out.writeByte(Section.SERIALIZE_TYPE_STRING);
+            writeVarint(value.length);
+            out.write(value);
+        } else if (object instanceof Integer) {
+            out.writeByte(Section.SERIALIZE_TYPE_UINT32);
+            out.writeInt((int) object);
+        } else if (object instanceof Long) {
+            out.writeByte(Section.SERIALIZE_TYPE_UINT64);
+            out.writeLong((long) object);
+        } else if (object instanceof Byte) {
+            out.writeByte(Section.SERIALIZE_TYPE_UINT8);
+            out.writeByte((byte) object);
+        } else if (object instanceof Section) {
+            writeSection((Section) object);
+        } else {
+            throw new IllegalArgumentException();
+        }
+    }
+}

app/src/main/java/com/m2049r/levin/util/LittleEndianDataInputStream.java

@@ -0,0 +1,564 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.util;
+
+import java.io.DataInput;
+import java.io.EOFException;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UTFDataFormatException;
+
+/**
+ * A little endian java.io.DataInputStream (without readLine())
+ */
+
+public class LittleEndianDataInputStream extends FilterInputStream implements
+        DataInput {
+
+    /**
+     * Creates a DataInputStream that uses the specified underlying InputStream.
+     *
+     * @param in the specified input stream
+     */
+    public LittleEndianDataInputStream(InputStream in) {
+        super(in);
+    }
+
+    @Deprecated
+    public final String readLine() {
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * Reads some number of bytes from the contained input stream and stores
+     * them into the buffer array <code>b</code>. The number of bytes actually
+     * read is returned as an integer. This method blocks until input data is
+     * available, end of file is detected, or an exception is thrown.
+     *
+     * <p>
+     * If <code>b</code> is null, a <code>NullPointerException</code> is thrown.
+     * If the length of <code>b</code> is zero, then no bytes are read and
+     * <code>0</code> is returned; otherwise, there is an attempt to read at
+     * least one byte. If no byte is available because the stream is at end of
+     * file, the value <code>-1</code> is returned; otherwise, at least one byte
+     * is read and stored into <code>b</code>.
+     *
+     * <p>
+     * The first byte read is stored into element <code>b[0]</code>, the next
+     * one into <code>b[1]</code>, and so on. The number of bytes read is, at
+     * most, equal to the length of <code>b</code>. Let <code>k</code> be the
+     * number of bytes actually read; these bytes will be stored in elements
+     * <code>b[0]</code> through <code>b[k-1]</code>, leaving elements
+     * <code>b[k]</code> through <code>b[b.length-1]</code> unaffected.
+     *
+     * <p>
+     * The <code>read(b)</code> method has the same effect as: <blockquote>
+     *
+     * <pre>
+     * read(b, 0, b.length)
+     * </pre>
+     *
+     * </blockquote>
+     *
+     * @param b the buffer into which the data is read.
+     * @return the total number of bytes read into the buffer, or
+     * <code>-1</code> if there is no more data because the end of the
+     * stream has been reached.
+     * @throws IOException if the first byte cannot be read for any reason other than
+     *                     end of file, the stream has been closed and the underlying
+     *                     input stream does not support reading after close, or
+     *                     another I/O error occurs.
+     * @see FilterInputStream#in
+     * @see InputStream#read(byte[], int, int)
+     */
+    public final int read(byte b[]) throws IOException {
+        return in.read(b, 0, b.length);
+    }
+
+    /**
+     * Reads up to <code>len</code> bytes of data from the contained input
+     * stream into an array of bytes. An attempt is made to read as many as
+     * <code>len</code> bytes, but a smaller number may be read, possibly zero.
+     * The number of bytes actually read is returned as an integer.
+     *
+     * <p>
+     * This method blocks until input data is available, end of file is
+     * detected, or an exception is thrown.
+     *
+     * <p>
+     * If <code>len</code> is zero, then no bytes are read and <code>0</code> is
+     * returned; otherwise, there is an attempt to read at least one byte. If no
+     * byte is available because the stream is at end of file, the value
+     * <code>-1</code> is returned; otherwise, at least one byte is read and
+     * stored into <code>b</code>.
+     *
+     * <p>
+     * The first byte read is stored into element <code>b[off]</code>, the next
+     * one into <code>b[off+1]</code>, and so on. The number of bytes read is,
+     * at most, equal to <code>len</code>. Let <i>k</i> be the number of bytes
+     * actually read; these bytes will be stored in elements <code>b[off]</code>
+     * through <code>b[off+</code><i>k</i><code>-1]</code>, leaving elements
+     * <code>b[off+</code><i>k</i><code>]</code> through
+     * <code>b[off+len-1]</code> unaffected.
+     *
+     * <p>
+     * In every case, elements <code>b[0]</code> through <code>b[off]</code> and
+     * elements <code>b[off+len]</code> through <code>b[b.length-1]</code> are
+     * unaffected.
+     *
+     * @param b   the buffer into which the data is read.
+     * @param off the start offset in the destination array <code>b</code>
+     * @param len the maximum number of bytes read.
+     * @return the total number of bytes read into the buffer, or
+     * <code>-1</code> if there is no more data because the end of the
+     * stream has been reached.
+     * @throws NullPointerException      If <code>b</code> is <code>null</code>.
+     * @throws IndexOutOfBoundsException If <code>off</code> is negative, <code>len</code> is
+     *                                   negative, or <code>len</code> is greater than
+     *                                   <code>b.length - off</code>
+     * @throws IOException               if the first byte cannot be read for any reason other than
+     *                                   end of file, the stream has been closed and the underlying
+     *                                   input stream does not support reading after close, or
+     *                                   another I/O error occurs.
+     * @see FilterInputStream#in
+     * @see InputStream#read(byte[], int, int)
+     */
+    public final int read(byte b[], int off, int len) throws IOException {
+        return in.read(b, off, len);
+    }
+
+    /**
+     * See the general contract of the <code>readFully</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @param b the buffer into which the data is read.
+     * @throws EOFException if this input stream reaches the end before reading all
+     *                      the bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final void readFully(byte b[]) throws IOException {
+        readFully(b, 0, b.length);
+    }
+
+    /**
+     * See the general contract of the <code>readFully</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @param b   the buffer into which the data is read.
+     * @param off the start offset of the data.
+     * @param len the number of bytes to read.
+     * @throws EOFException if this input stream reaches the end before reading all
+     *                      the bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final void readFully(byte b[], int off, int len) throws IOException {
+        if (len < 0)
+            throw new IndexOutOfBoundsException();
+        int n = 0;
+        while (n < len) {
+            int count = in.read(b, off + n, len - n);
+            if (count < 0)
+                throw new EOFException();
+            n += count;
+        }
+    }
+
+    /**
+     * See the general contract of the <code>skipBytes</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @param n the number of bytes to be skipped.
+     * @return the actual number of bytes skipped.
+     * @throws IOException if the contained input stream does not support seek, or
+     *                     the stream has been closed and the contained input stream
+     *                     does not support reading after close, or another I/O error
+     *                     occurs.
+     */
+    public final int skipBytes(int n) throws IOException {
+        int total = 0;
+        int cur = 0;
+
+        while ((total < n) && ((cur = (int) in.skip(n - total)) > 0)) {
+            total += cur;
+        }
+
+        return total;
+    }
+
+    /**
+     * See the general contract of the <code>readBoolean</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the <code>boolean</code> value read.
+     * @throws EOFException if this input stream has reached the end.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final boolean readBoolean() throws IOException {
+        int ch = in.read();
+        if (ch < 0)
+            throw new EOFException();
+        return (ch != 0);
+    }
+
+    /**
+     * See the general contract of the <code>readByte</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next byte of this input stream as a signed 8-bit
+     * <code>byte</code>.
+     * @throws EOFException if this input stream has reached the end.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final byte readByte() throws IOException {
+        int ch = in.read();
+        if (ch < 0)
+            throw new EOFException();
+        return (byte) (ch);
+    }
+
+    /**
+     * See the general contract of the <code>readUnsignedByte</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next byte of this input stream, interpreted as an unsigned
+     * 8-bit number.
+     * @throws EOFException if this input stream has reached the end.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final int readUnsignedByte() throws IOException {
+        int ch = in.read();
+        if (ch < 0)
+            throw new EOFException();
+        return ch;
+    }
+
+    /**
+     * See the general contract of the <code>readShort</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next two bytes of this input stream, interpreted as a signed
+     * 16-bit number.
+     * @throws EOFException if this input stream reaches the end before reading two
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final short readShort() throws IOException {
+        int ch1 = in.read();
+        int ch2 = in.read();
+        if ((ch1 | ch2) < 0)
+            throw new EOFException();
+        return (short) ((ch1 << 0) + (ch2 << 8));
+    }
+
+    /**
+     * See the general contract of the <code>readUnsignedShort</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next two bytes of this input stream, interpreted as an
+     * unsigned 16-bit integer.
+     * @throws EOFException if this input stream reaches the end before reading two
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final int readUnsignedShort() throws IOException {
+        int ch1 = in.read();
+        int ch2 = in.read();
+        if ((ch1 | ch2) < 0)
+            throw new EOFException();
+        return (ch1 << 0) + (ch2 << 8);
+    }
+
+    /**
+     * See the general contract of the <code>readChar</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next two bytes of this input stream, interpreted as a
+     * <code>char</code>.
+     * @throws EOFException if this input stream reaches the end before reading two
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final char readChar() throws IOException {
+        int ch1 = in.read();
+        int ch2 = in.read();
+        if ((ch1 | ch2) < 0)
+            throw new EOFException();
+        return (char) ((ch1 << 0) + (ch2 << 8));
+    }
+
+    /**
+     * See the general contract of the <code>readInt</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next four bytes of this input stream, interpreted as an
+     * <code>int</code>.
+     * @throws EOFException if this input stream reaches the end before reading four
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final int readInt() throws IOException {
+        int ch1 = in.read();
+        int ch2 = in.read();
+        int ch3 = in.read();
+        int ch4 = in.read();
+        if ((ch1 | ch2 | ch3 | ch4) < 0)
+            throw new EOFException();
+        return ((ch1 << 0) + (ch2 << 8) + (ch3 << 16) + (ch4 << 24));
+    }
+
+    private byte readBuffer[] = new byte[8];
+
+    /**
+     * See the general contract of the <code>readLong</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next eight bytes of this input stream, interpreted as a
+     * <code>long</code>.
+     * @throws EOFException if this input stream reaches the end before reading eight
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see FilterInputStream#in
+     */
+    public final long readLong() throws IOException {
+        readFully(readBuffer, 0, 8);
+        return (((long) readBuffer[7] << 56)
+                + ((long) (readBuffer[6] & 255) << 48)
+                + ((long) (readBuffer[5] & 255) << 40)
+                + ((long) (readBuffer[4] & 255) << 32)
+                + ((long) (readBuffer[3] & 255) << 24)
+                + ((readBuffer[2] & 255) << 16) + ((readBuffer[1] & 255) << 8) + ((readBuffer[0] & 255) << 0));
+    }
+
+    /**
+     * See the general contract of the <code>readFloat</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next four bytes of this input stream, interpreted as a
+     * <code>float</code>.
+     * @throws EOFException if this input stream reaches the end before reading four
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see java.io.DataInputStream#readInt()
+     * @see Float#intBitsToFloat(int)
+     */
+    public final float readFloat() throws IOException {
+        return Float.intBitsToFloat(readInt());
+    }
+
+    /**
+     * See the general contract of the <code>readDouble</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return the next eight bytes of this input stream, interpreted as a
+     * <code>double</code>.
+     * @throws EOFException if this input stream reaches the end before reading eight
+     *                      bytes.
+     * @throws IOException  the stream has been closed and the contained input stream
+     *                      does not support reading after close, or another I/O error
+     *                      occurs.
+     * @see java.io.DataInputStream#readLong()
+     * @see Double#longBitsToDouble(long)
+     */
+    public final double readDouble() throws IOException {
+        return Double.longBitsToDouble(readLong());
+    }
+
+    /**
+     * See the general contract of the <code>readUTF</code> method of
+     * <code>DataInput</code>.
+     * <p>
+     * Bytes for this operation are read from the contained input stream.
+     *
+     * @return a Unicode string.
+     * @throws EOFException           if this input stream reaches the end before reading all
+     *                                the bytes.
+     * @throws IOException            the stream has been closed and the contained input stream
+     *                                does not support reading after close, or another I/O error
+     *                                occurs.
+     * @throws UTFDataFormatException if the bytes do not represent a valid modified UTF-8
+     *                                encoding of a string.
+     * @see java.io.DataInputStream#readUTF(DataInput)
+     */
+    public final String readUTF() throws IOException {
+        return readUTF(this);
+    }
+
+    /**
+     * working arrays initialized on demand by readUTF
+     */
+    private byte bytearr[] = new byte[80];
+    private char chararr[] = new char[80];
+
+    /**
+     * Reads from the stream <code>in</code> a representation of a Unicode
+     * character string encoded in <a
+     * href="DataInput.html#modified-utf-8">modified UTF-8</a> format; this
+     * string of characters is then returned as a <code>String</code>. The
+     * details of the modified UTF-8 representation are exactly the same as for
+     * the <code>readUTF</code> method of <code>DataInput</code>.
+     *
+     * @param in a data input stream.
+     * @return a Unicode string.
+     * @throws EOFException           if the input stream reaches the end before all the bytes.
+     * @throws IOException            the stream has been closed and the contained input stream
+     *                                does not support reading after close, or another I/O error
+     *                                occurs.
+     * @throws UTFDataFormatException if the bytes do not represent a valid modified UTF-8
+     *                                encoding of a Unicode string.
+     * @see java.io.DataInputStream#readUnsignedShort()
+     */
+    public final static String readUTF(DataInput in) throws IOException {
+        int utflen = in.readUnsignedShort();
+        byte[] bytearr = null;
+        char[] chararr = null;
+        if (in instanceof LittleEndianDataInputStream) {
+            LittleEndianDataInputStream dis = (LittleEndianDataInputStream) in;
+            if (dis.bytearr.length < utflen) {
+                dis.bytearr = new byte[utflen * 2];
+                dis.chararr = new char[utflen * 2];
+            }
+            chararr = dis.chararr;
+            bytearr = dis.bytearr;
+        } else {
+            bytearr = new byte[utflen];
+            chararr = new char[utflen];
+        }
+
+        int c, char2, char3;
+        int count = 0;
+        int chararr_count = 0;
+
+        in.readFully(bytearr, 0, utflen);
+
+        while (count < utflen) {
+            c = (int) bytearr[count] & 0xff;
+            if (c > 127)
+                break;
+            count++;
+            chararr[chararr_count++] = (char) c;
+        }
+
+        while (count < utflen) {
+            c = (int) bytearr[count] & 0xff;
+            switch (c >> 4) {
+                case 0:
+                case 1:
+                case 2:
+                case 3:
+                case 4:
+                case 5:
+                case 6:
+                case 7:
+                    /* 0xxxxxxx */
+                    count++;
+                    chararr[chararr_count++] = (char) c;
+                    break;
+                case 12:
+                case 13:
+                    /* 110x xxxx 10xx xxxx */
+                    count += 2;
+                    if (count > utflen)
+                        throw new UTFDataFormatException(
+                                "malformed input: partial character at end");
+                    char2 = (int) bytearr[count - 1];
+                    if ((char2 & 0xC0) != 0x80)
+                        throw new UTFDataFormatException(
+                                "malformed input around byte " + count);
+                    chararr[chararr_count++] = (char) (((c & 0x1F) << 6) | (char2 & 0x3F));
+                    break;
+                case 14:
+                    /* 1110 xxxx 10xx xxxx 10xx xxxx */
+                    count += 3;
+                    if (count > utflen)
+                        throw new UTFDataFormatException(
+                                "malformed input: partial character at end");
+                    char2 = (int) bytearr[count - 2];
+                    char3 = (int) bytearr[count - 1];
+                    if (((char2 & 0xC0) != 0x80) || ((char3 & 0xC0) != 0x80))
+                        throw new UTFDataFormatException(
+                                "malformed input around byte " + (count - 1));
+                    chararr[chararr_count++] = (char) (((c & 0x0F) << 12)
+                            | ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0));
+                    break;
+                default:
+                    /* 10xx xxxx, 1111 xxxx */
+                    throw new UTFDataFormatException("malformed input around byte "
+                            + count);
+            }
+        }
+        // The number of chars produced may be less than utflen
+        return new String(chararr, 0, chararr_count);
+    }
+}

app/src/main/java/com/m2049r/levin/util/LittleEndianDataOutputStream.java

@@ -0,0 +1,403 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.levin.util;
+
+import java.io.DataOutput;
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.UTFDataFormatException;
+
+/**
+ * A little endian java.io.DataOutputStream
+ */
+
+public class LittleEndianDataOutputStream extends FilterOutputStream implements
+        DataOutput {
+
+    /**
+     * The number of bytes written to the data output stream so far. If this
+     * counter overflows, it will be wrapped to Integer.MAX_VALUE.
+     */
+    protected int written;
+
+    /**
+     * Creates a new data output stream to write data to the specified
+     * underlying output stream. The counter <code>written</code> is set to
+     * zero.
+     *
+     * @param out the underlying output stream, to be saved for later use.
+     * @see FilterOutputStream#out
+     */
+    public LittleEndianDataOutputStream(OutputStream out) {
+        super(out);
+    }
+
+    /**
+     * Increases the written counter by the specified value until it reaches
+     * Integer.MAX_VALUE.
+     */
+    private void incCount(int value) {
+        int temp = written + value;
+        if (temp < 0) {
+            temp = Integer.MAX_VALUE;
+        }
+        written = temp;
+    }
+
+    /**
+     * Writes the specified byte (the low eight bits of the argument
+     * <code>b</code>) to the underlying output stream. If no exception is
+     * thrown, the counter <code>written</code> is incremented by <code>1</code>
+     * .
+     * <p>
+     * Implements the <code>write</code> method of <code>OutputStream</code>.
+     *
+     * @param b the <code>byte</code> to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public synchronized void write(int b) throws IOException {
+        out.write(b);
+        incCount(1);
+    }
+
+    /**
+     * Writes <code>len</code> bytes from the specified byte array starting at
+     * offset <code>off</code> to the underlying output stream. If no exception
+     * is thrown, the counter <code>written</code> is incremented by
+     * <code>len</code>.
+     *
+     * @param b   the data.
+     * @param off the start offset in the data.
+     * @param len the number of bytes to write.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public synchronized void write(byte b[], int off, int len)
+            throws IOException {
+        out.write(b, off, len);
+        incCount(len);
+    }
+
+    /**
+     * Flushes this data output stream. This forces any buffered output bytes to
+     * be written out to the stream.
+     * <p>
+     * The <code>flush</code> method of <code>DataOutputStream</code> calls the
+     * <code>flush</code> method of its underlying output stream.
+     *
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     * @see OutputStream#flush()
+     */
+    public void flush() throws IOException {
+        out.flush();
+    }
+
+    /**
+     * Writes a <code>boolean</code> to the underlying output stream as a 1-byte
+     * value. The value <code>true</code> is written out as the value
+     * <code>(byte)1</code>; the value <code>false</code> is written out as the
+     * value <code>(byte)0</code>. If no exception is thrown, the counter
+     * <code>written</code> is incremented by <code>1</code>.
+     *
+     * @param v a <code>boolean</code> value to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeBoolean(boolean v) throws IOException {
+        out.write(v ? 1 : 0);
+        incCount(1);
+    }
+
+    /**
+     * Writes out a <code>byte</code> to the underlying output stream as a
+     * 1-byte value. If no exception is thrown, the counter <code>written</code>
+     * is incremented by <code>1</code>.
+     *
+     * @param v a <code>byte</code> value to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeByte(int v) throws IOException {
+        out.write(v);
+        incCount(1);
+    }
+
+    /**
+     * Writes a <code>short</code> to the underlying output stream as two bytes,
+     * low byte first. If no exception is thrown, the counter
+     * <code>written</code> is incremented by <code>2</code>.
+     *
+     * @param v a <code>short</code> to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeShort(int v) throws IOException {
+        out.write((v >>> 0) & 0xFF);
+        out.write((v >>> 8) & 0xFF);
+        incCount(2);
+    }
+
+    /**
+     * Writes a <code>char</code> to the underlying output stream as a 2-byte
+     * value, low byte first. If no exception is thrown, the counter
+     * <code>written</code> is incremented by <code>2</code>.
+     *
+     * @param v a <code>char</code> value to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeChar(int v) throws IOException {
+        out.write((v >>> 0) & 0xFF);
+        out.write((v >>> 8) & 0xFF);
+        incCount(2);
+    }
+
+    /**
+     * Writes an <code>int</code> to the underlying output stream as four bytes,
+     * low byte first. If no exception is thrown, the counter
+     * <code>written</code> is incremented by <code>4</code>.
+     *
+     * @param v an <code>int</code> to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeInt(int v) throws IOException {
+        out.write((v >>> 0) & 0xFF);
+        out.write((v >>> 8) & 0xFF);
+        out.write((v >>> 16) & 0xFF);
+        out.write((v >>> 24) & 0xFF);
+        incCount(4);
+    }
+
+    private byte writeBuffer[] = new byte[8];
+
+    /**
+     * Writes a <code>long</code> to the underlying output stream as eight
+     * bytes, low byte first. In no exception is thrown, the counter
+     * <code>written</code> is incremented by <code>8</code>.
+     *
+     * @param v a <code>long</code> to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeLong(long v) throws IOException {
+        writeBuffer[7] = (byte) (v >>> 56);
+        writeBuffer[6] = (byte) (v >>> 48);
+        writeBuffer[5] = (byte) (v >>> 40);
+        writeBuffer[4] = (byte) (v >>> 32);
+        writeBuffer[3] = (byte) (v >>> 24);
+        writeBuffer[2] = (byte) (v >>> 16);
+        writeBuffer[1] = (byte) (v >>> 8);
+        writeBuffer[0] = (byte) (v >>> 0);
+        out.write(writeBuffer, 0, 8);
+        incCount(8);
+    }
+
+    /**
+     * Converts the float argument to an <code>int</code> using the
+     * <code>floatToIntBits</code> method in class <code>Float</code>, and then
+     * writes that <code>int</code> value to the underlying output stream as a
+     * 4-byte quantity, low byte first. If no exception is thrown, the counter
+     * <code>written</code> is incremented by <code>4</code>.
+     *
+     * @param v a <code>float</code> value to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     * @see Float#floatToIntBits(float)
+     */
+    public final void writeFloat(float v) throws IOException {
+        writeInt(Float.floatToIntBits(v));
+    }
+
+    /**
+     * Converts the double argument to a <code>long</code> using the
+     * <code>doubleToLongBits</code> method in class <code>Double</code>, and
+     * then writes that <code>long</code> value to the underlying output stream
+     * as an 8-byte quantity, low byte first. If no exception is thrown, the
+     * counter <code>written</code> is incremented by <code>8</code>.
+     *
+     * @param v a <code>double</code> value to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     * @see Double#doubleToLongBits(double)
+     */
+    public final void writeDouble(double v) throws IOException {
+        writeLong(Double.doubleToLongBits(v));
+    }
+
+    /**
+     * Writes out the string to the underlying output stream as a sequence of
+     * bytes. Each character in the string is written out, in sequence, by
+     * discarding its high eight bits. If no exception is thrown, the counter
+     * <code>written</code> is incremented by the length of <code>s</code>.
+     *
+     * @param s a string of bytes to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see FilterOutputStream#out
+     */
+    public final void writeBytes(String s) throws IOException {
+        int len = s.length();
+        for (int i = 0; i < len; i++) {
+            out.write((byte) s.charAt(i));
+        }
+        incCount(len);
+    }
+
+    /**
+     * Writes a string to the underlying output stream as a sequence of
+     * characters. Each character is written to the data output stream as if by
+     * the <code>writeChar</code> method. If no exception is thrown, the counter
+     * <code>written</code> is incremented by twice the length of <code>s</code>
+     * .
+     *
+     * @param s a <code>String</code> value to be written.
+     * @throws IOException if an I/O error occurs.
+     * @see java.io.DataOutputStream#writeChar(int)
+     * @see FilterOutputStream#out
+     */
+    public final void writeChars(String s) throws IOException {
+        int len = s.length();
+        for (int i = 0; i < len; i++) {
+            int v = s.charAt(i);
+            out.write((v >>> 0) & 0xFF);
+            out.write((v >>> 8) & 0xFF);
+        }
+        incCount(len * 2);
+    }
+
+    /**
+     * Writes a string to the underlying output stream using <a
+     * href="DataInput.html#modified-utf-8">modified UTF-8</a> encoding in a
+     * machine-independent manner.
+     * <p>
+     * First, two bytes are written to the output stream as if by the
+     * <code>writeShort</code> method giving the number of bytes to follow. This
+     * value is the number of bytes actually written out, not the length of the
+     * string. Following the length, each character of the string is output, in
+     * sequence, using the modified UTF-8 encoding for the character. If no
+     * exception is thrown, the counter <code>written</code> is incremented by
+     * the total number of bytes written to the output stream. This will be at
+     * least two plus the length of <code>str</code>, and at most two plus
+     * thrice the length of <code>str</code>.
+     *
+     * @param str a string to be written.
+     * @throws IOException if an I/O error occurs.
+     */
+    public final void writeUTF(String str) throws IOException {
+        writeUTF(str, this);
+    }
+
+    /**
+     * bytearr is initialized on demand by writeUTF
+     */
+    private byte[] bytearr = null;
+
+    /**
+     * Writes a string to the specified DataOutput using <a
+     * href="DataInput.html#modified-utf-8">modified UTF-8</a> encoding in a
+     * machine-independent manner.
+     * <p>
+     * First, two bytes are written to out as if by the <code>writeShort</code>
+     * method giving the number of bytes to follow. This value is the number of
+     * bytes actually written out, not the length of the string. Following the
+     * length, each character of the string is output, in sequence, using the
+     * modified UTF-8 encoding for the character. If no exception is thrown, the
+     * counter <code>written</code> is incremented by the total number of bytes
+     * written to the output stream. This will be at least two plus the length
+     * of <code>str</code>, and at most two plus thrice the length of
+     * <code>str</code>.
+     *
+     * @param str a string to be written.
+     * @param out destination to write to
+     * @return The number of bytes written out.
+     * @throws IOException if an I/O error occurs.
+     */
+    static int writeUTF(String str, DataOutput out) throws IOException {
+        int strlen = str.length();
+        int utflen = 0;
+        int c, count = 0;
+
+        /* use charAt instead of copying String to char array */
+        for (int i = 0; i < strlen; i++) {
+            c = str.charAt(i);
+            if ((c >= 0x0001) && (c <= 0x007F)) {
+                utflen++;
+            } else if (c > 0x07FF) {
+                utflen += 3;
+            } else {
+                utflen += 2;
+            }
+        }
+
+        if (utflen > 65535)
+            throw new UTFDataFormatException("encoded string too long: "
+                    + utflen + " bytes");
+
+        byte[] bytearr = null;
+        if (out instanceof LittleEndianDataOutputStream) {
+            LittleEndianDataOutputStream dos = (LittleEndianDataOutputStream) out;
+            if (dos.bytearr == null || (dos.bytearr.length < (utflen + 2)))
+                dos.bytearr = new byte[(utflen * 2) + 2];
+            bytearr = dos.bytearr;
+        } else {
+            bytearr = new byte[utflen + 2];
+        }
+
+        bytearr[count++] = (byte) ((utflen >>> 8) & 0xFF);
+        bytearr[count++] = (byte) ((utflen >>> 0) & 0xFF);
+
+        int i = 0;
+        for (i = 0; i < strlen; i++) {
+            c = str.charAt(i);
+            if (!((c >= 0x0001) && (c <= 0x007F)))
+                break;
+            bytearr[count++] = (byte) c;
+        }
+
+        for (; i < strlen; i++) {
+            c = str.charAt(i);
+            if ((c >= 0x0001) && (c <= 0x007F)) {
+                bytearr[count++] = (byte) c;
+
+            } else if (c > 0x07FF) {
+                bytearr[count++] = (byte) (0xE0 | ((c >> 12) & 0x0F));
+                bytearr[count++] = (byte) (0x80 | ((c >> 6) & 0x3F));
+                bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
+            } else {
+                bytearr[count++] = (byte) (0xC0 | ((c >> 6) & 0x1F));
+                bytearr[count++] = (byte) (0x80 | ((c >> 0) & 0x3F));
+            }
+        }
+        out.write(bytearr, 0, utflen + 2);
+        return utflen + 2;
+    }
+
+    /**
+     * Returns the current value of the counter <code>written</code>, the number
+     * of bytes written to this data output stream so far. If the counter
+     * overflows, it will be wrapped to Integer.MAX_VALUE.
+     *
+     * @return the value of the <code>written</code> field.
+     * @see java.io.DataOutputStream#written
+     */
+    public final int size() {
+        return written;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/BaseActivity.java

@@ -0,0 +1,313 @@
+/*
+ * Copyright (c) 2017-2020 m2049r et al.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.app.PendingIntent;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+import android.nfc.FormatException;
+import android.nfc.NdefMessage;
+import android.nfc.NdefRecord;
+import android.nfc.NfcAdapter;
+import android.nfc.Tag;
+import android.nfc.tech.Ndef;
+import android.os.AsyncTask;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.PowerManager;
+import android.widget.Toast;
+
+import androidx.annotation.CallSuper;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+
+import com.m2049r.xmrwallet.data.BarcodeData;
+import com.m2049r.xmrwallet.dialog.ProgressDialog;
+import com.m2049r.xmrwallet.fragment.send.SendFragment;
+import com.m2049r.xmrwallet.ledger.Ledger;
+import com.m2049r.xmrwallet.ledger.LedgerProgressDialog;
+
+import java.io.IOException;
+
+import timber.log.Timber;
+
+public class BaseActivity extends SecureActivity
+        implements GenerateReviewFragment.ProgressListener, SubaddressFragment.ProgressListener {
+
+    ProgressDialog progressDialog = null;
+
+    private class SimpleProgressDialog extends ProgressDialog {
+
+        SimpleProgressDialog(Context context, int msgId) {
+            super(context);
+            setCancelable(false);
+            setMessage(context.getString(msgId));
+        }
+
+        @Override
+        public void onBackPressed() {
+            // prevent back button
+        }
+    }
+
+    @Override
+    public void showProgressDialog(int msgId) {
+        showProgressDialog(msgId, 250); // don't show dialog for fast operations
+    }
+
+    public void showProgressDialog(int msgId, long delayMillis) {
+        dismissProgressDialog(); // just in case
+        progressDialog = new SimpleProgressDialog(BaseActivity.this, msgId);
+        if (delayMillis > 0) {
+            Handler handler = new Handler();
+            handler.postDelayed(new Runnable() {
+                public void run() {
+                    if (progressDialog != null) progressDialog.show();
+                }
+            }, delayMillis);
+        } else {
+            progressDialog.show();
+        }
+    }
+
+    @Override
+    public void showLedgerProgressDialog(int mode) {
+        dismissProgressDialog(); // just in case
+        progressDialog = new LedgerProgressDialog(BaseActivity.this, mode);
+        Ledger.setListener((Ledger.Listener) progressDialog);
+        progressDialog.show();
+    }
+
+    @Override
+    public void dismissProgressDialog() {
+        if (progressDialog == null) return; // nothing to do
+        if (progressDialog instanceof Ledger.Listener) {
+            Ledger.unsetListener((Ledger.Listener) progressDialog);
+        }
+        if (progressDialog.isShowing()) {
+            progressDialog.dismiss();
+        }
+        progressDialog = null;
+    }
+
+    static final int RELEASE_WAKE_LOCK_DELAY = 5000; // millisconds
+
+    private PowerManager.WakeLock wl = null;
+
+    void acquireWakeLock() {
+        if ((wl != null) && wl.isHeld()) return;
+        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
+        this.wl = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, getString(R.string.app_name));
+        try {
+            wl.acquire();
+            Timber.d("WakeLock acquired");
+        } catch (SecurityException ex) {
+            Timber.w("WakeLock NOT acquired: %s", ex.getLocalizedMessage());
+            wl = null;
+        }
+    }
+
+    void releaseWakeLock(int delayMillis) {
+        Handler handler = new Handler(Looper.getMainLooper());
+        handler.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                releaseWakeLock();
+            }
+        }, delayMillis);
+    }
+
+    void releaseWakeLock() {
+        if ((wl == null) || !wl.isHeld()) return;
+        wl.release();
+        wl = null;
+        Timber.d("WakeLock released");
+    }
+
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        initNfc();
+    }
+
+    @Override
+    protected void onPostResume() {
+        super.onPostResume();
+        if (nfcAdapter != null) {
+            nfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, null, null);
+            // intercept all techs so we can tell the user their tag is no good
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        Timber.d("onPause()");
+        if (nfcAdapter != null)
+            nfcAdapter.disableForegroundDispatch(this);
+        super.onPause();
+    }
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        processNfcIntent(intent);
+    }
+
+    // NFC stuff
+    private NfcAdapter nfcAdapter;
+    private PendingIntent nfcPendingIntent;
+
+    public void initNfc() {
+        nfcAdapter = NfcAdapter.getDefaultAdapter(this);
+        if (nfcAdapter == null) // no NFC support
+            return;
+        nfcPendingIntent = PendingIntent.getActivity(this, 0,
+                new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP),
+                Build.VERSION.SDK_INT >= Build.VERSION_CODES.M ? PendingIntent.FLAG_IMMUTABLE : 0);
+    }
+
+    private void processNfcIntent(Intent intent) {
+        String action = intent.getAction();
+        Timber.d("ACTION=%s", action);
+        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)
+                || NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
+                || NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)) {
+            Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
+            Ndef ndef = Ndef.get(tag);
+            if (ndef == null) {
+                Toast.makeText(this, getString(R.string.nfc_tag_unsupported), Toast.LENGTH_LONG).show();
+                return;
+            }
+
+            Fragment f = getSupportFragmentManager().findFragmentById(R.id.fragment_container);
+            if (f instanceof ReceiveFragment) {
+                // We want to write a Tag from the ReceiveFragment
+                BarcodeData bc = ((ReceiveFragment) f).getBarcodeData();
+                if (bc != null) {
+                    new AsyncWriteTag(ndef, bc.getUri()).execute();
+                } // else wallet is not loaded yet or receive is otherwise not ready - ignore
+            } else if (f instanceof SendFragment) {
+                // We want to read a Tag for the SendFragment
+                NdefMessage ndefMessage = ndef.getCachedNdefMessage();
+                if (ndefMessage == null) {
+                    Toast.makeText(this, getString(R.string.nfc_tag_read_undef), Toast.LENGTH_LONG).show();
+                    return;
+                }
+                NdefRecord firstRecord = ndefMessage.getRecords()[0];
+                Uri uri = firstRecord.toUri(); // we insist on the first record
+                if (uri == null) {
+                    Toast.makeText(this, getString(R.string.nfc_tag_read_undef), Toast.LENGTH_LONG).show();
+                } else {
+                    BarcodeData bc = BarcodeData.fromString(uri.toString());
+                    if (bc == null)
+                        Toast.makeText(this, getString(R.string.nfc_tag_read_undef), Toast.LENGTH_LONG).show();
+                    else
+                        onUriScanned(bc);
+                }
+            }
+        }
+    }
+
+    // this gets called only if we get data
+    @CallSuper
+    void onUriScanned(BarcodeData barcodeData) {
+        // do nothing by default yet
+    }
+
+    private BarcodeData barcodeData = null;
+
+    private BarcodeData popBarcodeData() {
+        BarcodeData popped = barcodeData;
+        barcodeData = null;
+        return popped;
+    }
+
+    private class AsyncWriteTag extends AsyncTask<Void, Void, Boolean> {
+
+        Ndef ndef;
+        Uri uri;
+        String errorMessage = null;
+
+        AsyncWriteTag(Ndef ndef, Uri uri) {
+            this.ndef = ndef;
+            this.uri = uri;
+        }
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            showProgressDialog(R.string.progress_nfc_write);
+        }
+
+        @Override
+        protected Boolean doInBackground(Void... params) {
+            if (params.length != 0) return false;
+            try {
+                writeNdef(ndef, uri);
+                return true;
+            } catch (IOException | FormatException ex) {
+                Timber.e(ex);
+            } catch (IllegalArgumentException ex) {
+                errorMessage = ex.getMessage();
+                Timber.d(errorMessage);
+            } finally {
+                try {
+                    ndef.close();
+                } catch (IOException ex) {
+                    Timber.e(ex);
+                }
+            }
+            return false;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            super.onPostExecute(result);
+            if (isDestroyed()) {
+                return;
+            }
+            dismissProgressDialog();
+            if (!result) {
+                if (errorMessage != null)
+                    Toast.makeText(getApplicationContext(), errorMessage, Toast.LENGTH_LONG).show();
+                else
+                    Toast.makeText(getApplicationContext(), getString(R.string.nfc_write_failed), Toast.LENGTH_LONG).show();
+            } else {
+                Toast.makeText(getApplicationContext(), getString(R.string.nfc_write_successful), Toast.LENGTH_SHORT).show();
+            }
+        }
+    }
+
+    void writeNdef(Ndef ndef, Uri uri) throws IOException, FormatException {
+        NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
+        if (nfcAdapter == null) return; // no NFC support here
+
+        NdefRecord recordNFC = NdefRecord.createUri(uri);
+        NdefMessage message = new NdefMessage(recordNFC);
+        ndef.connect();
+        int tagSize = ndef.getMaxSize();
+        int msgSize = message.getByteArrayLength();
+        Timber.d("tagSize=%d, msgSIze=%d, uriSize=%d", tagSize, msgSize, uri.toString().length());
+        if (tagSize < msgSize)
+            throw new IllegalArgumentException(getString(R.string.nfc_tag_size, tagSize, msgSize));
+        ndef.writeNdefMessage(message);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/GenerateFragment.java

@@ -0,0 +1,615 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import androidx.annotation.NonNull;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.Html;
+import android.text.InputType;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.LinearLayout;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.switchmaterial.SwitchMaterial;
+import com.google.android.material.textfield.TextInputLayout;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.FingerprintHelper;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.KeyStoreHelper;
+import com.m2049r.xmrwallet.util.RestoreHeight;
+import com.m2049r.xmrwallet.util.ledger.Monero;
+import com.m2049r.xmrwallet.widget.PasswordEntryView;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.io.File;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+
+import timber.log.Timber;
+
+public class GenerateFragment extends Fragment {
+
+    static final String TYPE = "type";
+    static final String TYPE_NEW = "new";
+    static final String TYPE_KEY = "key";
+    static final String TYPE_SEED = "seed";
+    static final String TYPE_LEDGER = "ledger";
+    static final String TYPE_VIEWONLY = "view";
+
+    private TextInputLayout etWalletName;
+    private PasswordEntryView etWalletPassword;
+    private LinearLayout llFingerprintAuth;
+    private TextInputLayout etWalletAddress;
+    private TextInputLayout etWalletMnemonic;
+    private TextInputLayout etWalletViewKey;
+    private TextInputLayout etWalletSpendKey;
+    private TextInputLayout etWalletRestoreHeight;
+    private Button bGenerate;
+
+    private Button bSeedOffset;
+    private TextInputLayout etSeedOffset;
+
+    private String type = null;
+
+    private void clearErrorOnTextEntry(final TextInputLayout textInputLayout) {
+        textInputLayout.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable editable) {
+                textInputLayout.setError(null);
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+            }
+        });
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Bundle args = getArguments();
+        this.type = args.getString(TYPE);
+
+        View view = inflater.inflate(R.layout.fragment_generate, container, false);
+
+        etWalletName = view.findViewById(R.id.etWalletName);
+        etWalletPassword = view.findViewById(R.id.etWalletPassword);
+        llFingerprintAuth = view.findViewById(R.id.llFingerprintAuth);
+        etWalletMnemonic = view.findViewById(R.id.etWalletMnemonic);
+        etWalletAddress = view.findViewById(R.id.etWalletAddress);
+        etWalletViewKey = view.findViewById(R.id.etWalletViewKey);
+        etWalletSpendKey = view.findViewById(R.id.etWalletSpendKey);
+        etWalletRestoreHeight = view.findViewById(R.id.etWalletRestoreHeight);
+        bGenerate = view.findViewById(R.id.bGenerate);
+        bSeedOffset = view.findViewById(R.id.bSeedOffset);
+        etSeedOffset = view.findViewById(R.id.etSeedOffset);
+
+        etWalletAddress.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+        etWalletViewKey.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+        etWalletSpendKey.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+
+        etWalletName.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                checkName();
+            }
+        });
+        clearErrorOnTextEntry(etWalletName);
+
+        etWalletMnemonic.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                checkMnemonic();
+            }
+        });
+        clearErrorOnTextEntry(etWalletMnemonic);
+
+        etWalletAddress.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                checkAddress();
+            }
+        });
+        clearErrorOnTextEntry(etWalletAddress);
+
+        etWalletViewKey.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                checkViewKey();
+            }
+        });
+        clearErrorOnTextEntry(etWalletViewKey);
+
+        etWalletSpendKey.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                checkSpendKey();
+            }
+        });
+        clearErrorOnTextEntry(etWalletSpendKey);
+
+        Helper.showKeyboard(requireActivity());
+
+        etWalletName.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+            if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                    || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                if (checkName()) {
+                    etWalletPassword.requestFocus();
+                } // otherwise ignore
+                return true;
+            }
+            return false;
+        });
+
+        if (FingerprintHelper.isDeviceSupported(getContext())) {
+            llFingerprintAuth.setVisibility(View.VISIBLE);
+
+            final SwitchMaterial swFingerprintAllowed = (SwitchMaterial) llFingerprintAuth.getChildAt(0);
+            swFingerprintAllowed.setOnClickListener(view1 -> {
+                if (!swFingerprintAllowed.isChecked()) return;
+
+                MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(requireActivity());
+                builder.setMessage(Html.fromHtml(getString(R.string.generate_fingerprint_warn)))
+                        .setCancelable(false)
+                        .setPositiveButton(getString(R.string.label_ok), null)
+                        .setNegativeButton(getString(R.string.label_cancel), (dialogInterface, i) -> swFingerprintAllowed.setChecked(false))
+                        .show();
+            });
+        }
+
+        switch (type) {
+            case TYPE_NEW:
+                etWalletPassword.getEditText().setImeOptions(EditorInfo.IME_ACTION_UNSPECIFIED);
+                break;
+            case TYPE_LEDGER:
+                etWalletPassword.getEditText().setImeOptions(EditorInfo.IME_ACTION_DONE);
+                etWalletPassword.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_DONE)) {
+                        etWalletRestoreHeight.requestFocus();
+                        return true;
+                    }
+                    return false;
+                });
+                break;
+            case TYPE_SEED:
+                etWalletPassword.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                        etWalletMnemonic.requestFocus();
+                        return true;
+                    }
+                    return false;
+                });
+                etWalletMnemonic.setVisibility(View.VISIBLE);
+                etWalletMnemonic.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                        if (checkMnemonic()) {
+                            etWalletRestoreHeight.requestFocus();
+                        }
+                        return true;
+                    }
+                    return false;
+                });
+                bSeedOffset.setVisibility(View.VISIBLE);
+                bSeedOffset.setOnClickListener(v -> toggleSeedOffset());
+                break;
+            case TYPE_KEY:
+            case TYPE_VIEWONLY:
+                etWalletPassword.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                        etWalletAddress.requestFocus();
+                        return true;
+                    }
+                    return false;
+                });
+                etWalletAddress.setVisibility(View.VISIBLE);
+                etWalletAddress.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                        if (checkAddress()) {
+                            etWalletViewKey.requestFocus();
+                        }
+                        return true;
+                    }
+                    return false;
+                });
+                etWalletViewKey.setVisibility(View.VISIBLE);
+                etWalletViewKey.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                        if (checkViewKey()) {
+                            if (type.equals(TYPE_KEY)) {
+                                etWalletSpendKey.requestFocus();
+                            } else {
+                                etWalletRestoreHeight.requestFocus();
+                            }
+                        }
+                        return true;
+                    }
+                    return false;
+                });
+                break;
+        }
+        if (type.equals(TYPE_KEY)) {
+            etWalletSpendKey.setVisibility(View.VISIBLE);
+            etWalletSpendKey.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                        || (actionId == EditorInfo.IME_ACTION_NEXT)) {
+                    if (checkSpendKey()) {
+                        etWalletRestoreHeight.requestFocus();
+                    }
+                    return true;
+                }
+                return false;
+            });
+        }
+        if (!type.equals(TYPE_NEW)) {
+            etWalletRestoreHeight.setVisibility(View.VISIBLE);
+            etWalletRestoreHeight.getEditText().setImeOptions(EditorInfo.IME_ACTION_UNSPECIFIED);
+        }
+        bGenerate.setOnClickListener(v -> {
+            Helper.hideKeyboard(getActivity());
+            generateWallet();
+        });
+
+        etWalletName.requestFocus();
+
+        return view;
+    }
+
+    void toggleSeedOffset() {
+        if (etSeedOffset.getVisibility() == View.VISIBLE) {
+            etSeedOffset.getEditText().getText().clear();
+            etSeedOffset.setVisibility(View.GONE);
+            bSeedOffset.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_keyboard_arrow_down, 0, 0, 0);
+        } else {
+            etSeedOffset.setVisibility(View.VISIBLE);
+            bSeedOffset.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_keyboard_arrow_up, 0, 0, 0);
+            etSeedOffset.requestFocusFromTouch();
+        }
+    }
+
+    private boolean checkName() {
+        String name = etWalletName.getEditText().getText().toString();
+        boolean ok = true;
+        if (name.length() == 0) {
+            etWalletName.setError(getString(R.string.generate_wallet_name));
+            ok = false;
+        } else if (name.charAt(0) == '.') {
+            etWalletName.setError(getString(R.string.generate_wallet_dot));
+            ok = false;
+        } else {
+            File walletFile = Helper.getWalletFile(getActivity(), name);
+            if (WalletManager.getInstance().walletExists(walletFile)) {
+                etWalletName.setError(getString(R.string.generate_wallet_exists));
+                ok = false;
+            }
+        }
+        if (ok) {
+            etWalletName.setError(null);
+        }
+        return ok;
+    }
+
+    private boolean checkHeight() {
+        long height = !type.equals(TYPE_NEW) ? getHeight() : 0;
+        boolean ok = true;
+        if (height < 0) {
+            etWalletRestoreHeight.setError(getString(R.string.generate_restoreheight_error));
+            ok = false;
+        }
+        if (ok) {
+            etWalletRestoreHeight.setError(null);
+        }
+        return ok;
+    }
+
+    private long getHeight() {
+        long height = -1;
+
+        String restoreHeight = etWalletRestoreHeight.getEditText().getText().toString().trim();
+        if (restoreHeight.isEmpty()) return -1;
+        try {
+            // is it a date?
+            SimpleDateFormat parser = new SimpleDateFormat("yyyy-MM-dd");
+            parser.setLenient(false);
+            height = RestoreHeight.getInstance().getHeight(parser.parse(restoreHeight));
+        } catch (ParseException ignored) {
+        }
+        if ((height < 0) && (restoreHeight.length() == 8))
+            try {
+                // is it a date without dashes?
+                SimpleDateFormat parser = new SimpleDateFormat("yyyyMMdd");
+                parser.setLenient(false);
+                height = RestoreHeight.getInstance().getHeight(parser.parse(restoreHeight));
+            } catch (ParseException ignored) {
+            }
+        if (height < 0)
+            try {
+                // or is it a height?
+                height = Long.parseLong(restoreHeight);
+            } catch (NumberFormatException ex) {
+                return -1;
+            }
+        Timber.d("Using Restore Height = %d", height);
+        return height;
+    }
+
+    private boolean checkMnemonic() {
+        String seed = etWalletMnemonic.getEditText().getText().toString();
+        boolean ok = (seed.split("\\s").length == 25); // 25 words
+        if (!ok) {
+            etWalletMnemonic.setError(getString(R.string.generate_check_mnemonic));
+        } else {
+            etWalletMnemonic.setError(null);
+        }
+        return ok;
+    }
+
+    private boolean checkAddress() {
+        String address = etWalletAddress.getEditText().getText().toString();
+        boolean ok = Wallet.isAddressValid(address);
+        if (!ok) {
+            etWalletAddress.setError(getString(R.string.generate_check_address));
+        } else {
+            etWalletAddress.setError(null);
+        }
+        return ok;
+    }
+
+    private boolean checkViewKey() {
+        String viewKey = etWalletViewKey.getEditText().getText().toString();
+        boolean ok = (viewKey.length() == 64) && (viewKey.matches("^[0-9a-fA-F]+$"));
+        if (!ok) {
+            etWalletViewKey.setError(getString(R.string.generate_check_key));
+        } else {
+            etWalletViewKey.setError(null);
+        }
+        return ok;
+    }
+
+    private boolean checkSpendKey() {
+        String spendKey = etWalletSpendKey.getEditText().getText().toString();
+        boolean ok = ((spendKey.length() == 0) || ((spendKey.length() == 64) && (spendKey.matches("^[0-9a-fA-F]+$"))));
+        if (!ok) {
+            etWalletSpendKey.setError(getString(R.string.generate_check_key));
+        } else {
+            etWalletSpendKey.setError(null);
+        }
+        return ok;
+    }
+
+    private void generateWallet() {
+        if (!checkName()) return;
+        if (!checkHeight()) return;
+
+        String name = etWalletName.getEditText().getText().toString();
+        String password = etWalletPassword.getEditText().getText().toString();
+        boolean fingerprintAuthAllowed = ((SwitchMaterial) llFingerprintAuth.getChildAt(0)).isChecked();
+
+        // create the real wallet password
+        String crazyPass = KeyStoreHelper.getCrazyPass(getActivity(), password);
+
+        long height = getHeight();
+        if (height < 0) height = 0;
+
+        switch (type) {
+            case TYPE_NEW:
+                bGenerate.setEnabled(false);
+                if (fingerprintAuthAllowed) {
+                    KeyStoreHelper.saveWalletUserPass(requireActivity(), name, password);
+                }
+                activityCallback.onGenerate(name, crazyPass);
+                break;
+            case TYPE_SEED:
+                if (!checkMnemonic()) return;
+                final String seed = etWalletMnemonic.getEditText().getText().toString();
+                bGenerate.setEnabled(false);
+                if (fingerprintAuthAllowed) {
+                    KeyStoreHelper.saveWalletUserPass(requireActivity(), name, password);
+                }
+                final String offset = etSeedOffset.getEditText().getText().toString();
+                activityCallback.onGenerate(name, crazyPass, seed, offset, height);
+                break;
+            case TYPE_LEDGER:
+                bGenerate.setEnabled(false);
+                if (fingerprintAuthAllowed) {
+                    KeyStoreHelper.saveWalletUserPass(requireActivity(), name, password);
+                }
+                activityCallback.onGenerateLedger(name, crazyPass, height);
+                break;
+            case TYPE_KEY:
+            case TYPE_VIEWONLY:
+                if (checkAddress() && checkViewKey() && checkSpendKey()) {
+                    bGenerate.setEnabled(false);
+                    String address = etWalletAddress.getEditText().getText().toString();
+                    String viewKey = etWalletViewKey.getEditText().getText().toString();
+                    String spendKey = "";
+                    if (type.equals(TYPE_KEY)) {
+                        spendKey = etWalletSpendKey.getEditText().getText().toString();
+                    }
+                    if (fingerprintAuthAllowed) {
+                        KeyStoreHelper.saveWalletUserPass(requireActivity(), name, password);
+                    }
+                    activityCallback.onGenerate(name, crazyPass, address, viewKey, spendKey, height);
+                }
+                break;
+        }
+    }
+
+    public void walletGenerateError() {
+        bGenerate.setEnabled(true);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setTitle(getString(R.string.generate_title) + " - " + getType());
+        activityCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+
+    }
+
+    String getType() {
+        switch (type) {
+            case TYPE_KEY:
+                return getString(R.string.generate_wallet_type_key);
+            case TYPE_NEW:
+                return getString(R.string.generate_wallet_type_new);
+            case TYPE_SEED:
+                return getString(R.string.generate_wallet_type_seed);
+            case TYPE_LEDGER:
+                return getString(R.string.generate_wallet_type_ledger);
+            case TYPE_VIEWONLY:
+                return getString(R.string.generate_wallet_type_view);
+            default:
+                Timber.e("unknown type %s", type);
+                return "?";
+        }
+    }
+
+    GenerateFragment.Listener activityCallback;
+
+    public interface Listener {
+        void onGenerate(String name, String password);
+
+        void onGenerate(String name, String password, String seed, String offset, long height);
+
+        void onGenerate(String name, String password, String address, String viewKey, String spendKey, long height);
+
+        void onGenerateLedger(String name, String password, long height);
+
+        void setTitle(String title);
+
+        void setToolbarButton(int type);
+
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof GenerateFragment.Listener) {
+            this.activityCallback = (GenerateFragment.Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        switch (type) {
+            case TYPE_KEY:
+                inflater.inflate(R.menu.create_wallet_keys, menu);
+                break;
+            case TYPE_NEW:
+                inflater.inflate(R.menu.create_wallet_new, menu);
+                break;
+            case TYPE_SEED:
+                inflater.inflate(R.menu.create_wallet_seed, menu);
+                break;
+            case TYPE_LEDGER:
+                inflater.inflate(R.menu.create_wallet_ledger, menu);
+                break;
+            case TYPE_VIEWONLY:
+                inflater.inflate(R.menu.create_wallet_view, menu);
+                break;
+            default:
+        }
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    AlertDialog ledgerDialog = null;
+
+    public void convertLedgerSeed() {
+        if (ledgerDialog != null) return;
+        final Activity activity = requireActivity();
+        View promptsView = getLayoutInflater().inflate(R.layout.prompt_ledger_seed, null);
+        MaterialAlertDialogBuilder alertDialogBuilder = new MaterialAlertDialogBuilder(activity);
+        alertDialogBuilder.setView(promptsView);
+
+        final TextInputLayout etSeed = promptsView.findViewById(R.id.etSeed);
+        final TextInputLayout etPassphrase = promptsView.findViewById(R.id.etPassphrase);
+
+        clearErrorOnTextEntry(etSeed);
+
+        alertDialogBuilder
+                .setCancelable(false)
+                .setPositiveButton(getString(R.string.label_ok), null)
+                .setNegativeButton(getString(R.string.label_cancel),
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int id) {
+                                Helper.hideKeyboardAlways(activity);
+                                etWalletMnemonic.getEditText().getText().clear();
+                                dialog.cancel();
+                                ledgerDialog = null;
+                            }
+                        });
+
+        ledgerDialog = alertDialogBuilder.create();
+
+        ledgerDialog.setOnShowListener(dialog -> {
+            Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
+            button.setOnClickListener(view -> {
+                String ledgerSeed = etSeed.getEditText().getText().toString();
+                String ledgerPassphrase = etPassphrase.getEditText().getText().toString();
+                String moneroSeed = Monero.convert(ledgerSeed, ledgerPassphrase);
+                if (moneroSeed != null) {
+                    etWalletMnemonic.getEditText().setText(moneroSeed);
+                    ledgerDialog.dismiss();
+                    ledgerDialog = null;
+                } else {
+                    etSeed.setError(getString(R.string.bad_ledger_seed));
+                }
+            });
+        });
+
+        if (Helper.preventScreenshot()) {
+            ledgerDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
+        ledgerDialog.show();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/GenerateReviewFragment.java

@@ -0,0 +1,711 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.Html;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.FrameLayout;
+import android.widget.ImageButton;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.ScrollView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.switchmaterial.SwitchMaterial;
+import com.google.android.material.textfield.TextInputLayout;
+import com.m2049r.xmrwallet.ledger.Ledger;
+import com.m2049r.xmrwallet.ledger.LedgerProgressDialog;
+import com.m2049r.xmrwallet.model.NetworkType;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.FingerprintHelper;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.KeyStoreHelper;
+import com.m2049r.xmrwallet.util.MoneroThreadPoolExecutor;
+import com.m2049r.xmrwallet.widget.PasswordEntryView;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.text.NumberFormat;
+
+import timber.log.Timber;
+
+public class GenerateReviewFragment extends Fragment {
+    static final public String VIEW_TYPE_DETAILS = "details";
+    static final public String VIEW_TYPE_ACCEPT = "accept";
+    static final public String VIEW_TYPE_WALLET = "wallet";
+
+    public static final String REQUEST_TYPE = "type";
+    public static final String REQUEST_PATH = "path";
+    public static final String REQUEST_PASSWORD = "password";
+
+    private ScrollView scrollview;
+
+    private ProgressBar pbProgress;
+    private TextView tvWalletPassword;
+    private TextView tvWalletAddress;
+    private FrameLayout flWalletMnemonic;
+    private TextView tvWalletMnemonic;
+    private TextView tvWalletHeight;
+    private TextView tvWalletViewKey;
+    private TextView tvWalletSpendKey;
+    private ImageButton bCopyAddress;
+    private LinearLayout llAdvancedInfo;
+    private LinearLayout llPassword;
+    private LinearLayout llMnemonic;
+    private LinearLayout llSpendKey;
+    private LinearLayout llViewKey;
+    private Button bAdvancedInfo;
+    private Button bAccept;
+
+    private Button bSeedOffset;
+    private TextInputLayout etSeedOffset;
+
+    private String walletPath;
+    private String walletName;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        View view = inflater.inflate(R.layout.fragment_review, container, false);
+
+        scrollview = view.findViewById(R.id.scrollview);
+        pbProgress = view.findViewById(R.id.pbProgress);
+        tvWalletPassword = view.findViewById(R.id.tvWalletPassword);
+        tvWalletAddress = view.findViewById(R.id.tvWalletAddress);
+        tvWalletViewKey = view.findViewById(R.id.tvWalletViewKey);
+        tvWalletSpendKey = view.findViewById(R.id.tvWalletSpendKey);
+        tvWalletMnemonic = view.findViewById(R.id.tvWalletMnemonic);
+        flWalletMnemonic = view.findViewById(R.id.flWalletMnemonic);
+        tvWalletHeight = view.findViewById(R.id.tvWalletHeight);
+        bCopyAddress = view.findViewById(R.id.bCopyAddress);
+        bAdvancedInfo = view.findViewById(R.id.bAdvancedInfo);
+        llAdvancedInfo = view.findViewById(R.id.llAdvancedInfo);
+        llPassword = view.findViewById(R.id.llPassword);
+        llMnemonic = view.findViewById(R.id.llMnemonic);
+        llSpendKey = view.findViewById(R.id.llSpendKey);
+        llViewKey = view.findViewById(R.id.llViewKey);
+
+        etSeedOffset = view.findViewById(R.id.etSeedOffset);
+        bSeedOffset = view.findViewById(R.id.bSeedOffset);
+
+        bAccept = view.findViewById(R.id.bAccept);
+
+        boolean allowCopy = WalletManager.getInstance().getNetworkType() != NetworkType.NetworkType_Mainnet;
+        tvWalletMnemonic.setTextIsSelectable(allowCopy);
+        tvWalletSpendKey.setTextIsSelectable(allowCopy);
+        tvWalletPassword.setTextIsSelectable(allowCopy);
+
+        bAccept.setOnClickListener(v -> acceptWallet());
+        view.findViewById(R.id.bCopyViewKey).setOnClickListener(v -> copyViewKey());
+        bCopyAddress.setEnabled(false);
+        bCopyAddress.setOnClickListener(v -> copyAddress());
+        bAdvancedInfo.setOnClickListener(v -> toggleAdvancedInfo());
+
+        bSeedOffset.setOnClickListener(v -> toggleSeedOffset());
+        etSeedOffset.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable s) {
+                showSeed();
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start,
+                                          int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start,
+                                      int before, int count) {
+            }
+        });
+
+        Bundle args = getArguments();
+        type = args.getString(REQUEST_TYPE);
+        walletPath = args.getString(REQUEST_PATH);
+        localPassword = args.getString(REQUEST_PASSWORD);
+        showDetails();
+        return view;
+    }
+
+    String getSeedOffset() {
+        return etSeedOffset.getEditText().getText().toString();
+    }
+
+    boolean seedOffsetInProgress = false;
+
+    void showSeed() {
+        synchronized (this) {
+            if (seedOffsetInProgress) return;
+            seedOffsetInProgress = true;
+        }
+        new AsyncShowSeed().executeOnExecutor(MoneroThreadPoolExecutor.MONERO_THREAD_POOL_EXECUTOR, walletPath);
+    }
+
+    void showDetails() {
+        tvWalletPassword.setText(null);
+        new AsyncShow().executeOnExecutor(MoneroThreadPoolExecutor.MONERO_THREAD_POOL_EXECUTOR, walletPath);
+    }
+
+    void copyViewKey() {
+        Helper.clipBoardCopy(requireActivity(), getString(R.string.label_copy_viewkey), tvWalletViewKey.getText().toString());
+        Toast.makeText(getActivity(), getString(R.string.message_copy_viewkey), Toast.LENGTH_SHORT).show();
+    }
+
+    void copyAddress() {
+        Helper.clipBoardCopy(requireActivity(), getString(R.string.label_copy_address), tvWalletAddress.getText().toString());
+        Toast.makeText(getActivity(), getString(R.string.message_copy_address), Toast.LENGTH_SHORT).show();
+    }
+
+    void nocopy() {
+        Toast.makeText(getActivity(), getString(R.string.message_nocopy), Toast.LENGTH_SHORT).show();
+    }
+
+    void toggleAdvancedInfo() {
+        if (llAdvancedInfo.getVisibility() == View.VISIBLE) {
+            llAdvancedInfo.setVisibility(View.GONE);
+            bAdvancedInfo.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_keyboard_arrow_down, 0, 0, 0);
+        } else {
+            llAdvancedInfo.setVisibility(View.VISIBLE);
+            bAdvancedInfo.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_keyboard_arrow_up, 0, 0, 0);
+            scrollview.post(() -> scrollview.fullScroll(ScrollView.FOCUS_DOWN));
+        }
+    }
+
+    void toggleSeedOffset() {
+        if (etSeedOffset.getVisibility() == View.VISIBLE) {
+            etSeedOffset.getEditText().getText().clear();
+            etSeedOffset.setVisibility(View.GONE);
+            bSeedOffset.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_keyboard_arrow_down, 0, 0, 0);
+        } else {
+            etSeedOffset.setVisibility(View.VISIBLE);
+            bSeedOffset.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_keyboard_arrow_up, 0, 0, 0);
+            etSeedOffset.requestFocusFromTouch();
+        }
+    }
+
+    String type;
+
+    private void acceptWallet() {
+        bAccept.setEnabled(false);
+        acceptCallback.onAccept(walletName, getPassword());
+    }
+
+    private class AsyncShow extends AsyncTask<String, Void, Boolean> {
+        String name;
+        String address;
+        long height;
+        String seed;
+        String viewKey;
+        String spendKey;
+        Wallet.Status walletStatus;
+
+        boolean dialogOpened = false;
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            showProgress();
+            if ((walletPath != null)
+                    && (WalletManager.getInstance().queryWalletDevice(walletPath + ".keys", getPassword())
+                    == Wallet.Device.Device_Ledger)
+                    && (progressCallback != null)) {
+                progressCallback.showLedgerProgressDialog(LedgerProgressDialog.TYPE_RESTORE);
+                dialogOpened = true;
+            }
+        }
+
+        @Override
+        protected Boolean doInBackground(String... params) {
+            if (params.length != 1) return false;
+            String walletPath = params[0];
+
+            Wallet wallet;
+            boolean closeWallet;
+            if (type.equals(GenerateReviewFragment.VIEW_TYPE_WALLET)) {
+                wallet = GenerateReviewFragment.this.walletCallback.getWallet();
+                closeWallet = false;
+            } else {
+                wallet = WalletManager.getInstance().openWallet(walletPath, getPassword());
+                closeWallet = true;
+            }
+            name = wallet.getName();
+            walletStatus = wallet.getStatus();
+            if (!walletStatus.isOk()) {
+                if (closeWallet) wallet.close();
+                return false;
+            }
+
+            address = wallet.getAddress();
+            height = wallet.getRestoreHeight();
+            seed = wallet.getSeed(getSeedOffset());
+            switch (wallet.getDeviceType()) {
+                case Device_Ledger:
+                    viewKey = Ledger.Key();
+                    break;
+                case Device_Software:
+                    viewKey = wallet.getSecretViewKey();
+                    break;
+                default:
+                    throw new IllegalStateException("Hardware backing not supported. At all!");
+            }
+            spendKey = wallet.isWatchOnly() ? getActivity().getString(R.string.label_watchonly) : wallet.getSecretSpendKey();
+            if (closeWallet) wallet.close();
+            return true;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            super.onPostExecute(result);
+            if (dialogOpened)
+                progressCallback.dismissProgressDialog();
+            if (!isAdded()) return; // never mind
+            walletName = name;
+            if (result) {
+                if (type.equals(GenerateReviewFragment.VIEW_TYPE_ACCEPT)) {
+                    bAccept.setVisibility(View.VISIBLE);
+                    bAccept.setEnabled(true);
+                }
+                llPassword.setVisibility(View.VISIBLE);
+                tvWalletPassword.setText(getPassword());
+                tvWalletAddress.setText(address);
+                tvWalletHeight.setText(NumberFormat.getInstance().format(height));
+                if (!seed.isEmpty()) {
+                    llMnemonic.setVisibility(View.VISIBLE);
+                    tvWalletMnemonic.setText(seed);
+                }
+                boolean showAdvanced = false;
+                if (isKeyValid(viewKey)) {
+                    llViewKey.setVisibility(View.VISIBLE);
+                    tvWalletViewKey.setText(viewKey);
+                    showAdvanced = true;
+                }
+                if (isKeyValid(spendKey)) {
+                    llSpendKey.setVisibility(View.VISIBLE);
+                    tvWalletSpendKey.setText(spendKey);
+                    showAdvanced = true;
+                }
+                if (showAdvanced) bAdvancedInfo.setVisibility(View.VISIBLE);
+                bCopyAddress.setEnabled(true);
+                activityCallback.setTitle(name, getString(R.string.details_title));
+                activityCallback.setToolbarButton(
+                        GenerateReviewFragment.VIEW_TYPE_ACCEPT.equals(type) ? Toolbar.BUTTON_NONE : Toolbar.BUTTON_BACK);
+            } else {
+                // TODO show proper error message and/or end the fragment?
+                tvWalletAddress.setText(walletStatus.toString());
+                tvWalletHeight.setText(walletStatus.toString());
+                tvWalletMnemonic.setText(walletStatus.toString());
+                tvWalletViewKey.setText(walletStatus.toString());
+                tvWalletSpendKey.setText(walletStatus.toString());
+            }
+            hideProgress();
+        }
+    }
+
+    Listener activityCallback = null;
+    ProgressListener progressCallback = null;
+    AcceptListener acceptCallback = null;
+    ListenerWithWallet walletCallback = null;
+    PasswordChangedListener passwordCallback = null;
+
+    public interface Listener {
+        void setTitle(String title, String subtitle);
+
+        void setToolbarButton(int type);
+    }
+
+    public interface ProgressListener {
+        void showProgressDialog(int msgId);
+
+        void showLedgerProgressDialog(int mode);
+
+        void dismissProgressDialog();
+    }
+
+    public interface AcceptListener {
+        void onAccept(String name, String password);
+    }
+
+    public interface ListenerWithWallet {
+        Wallet getWallet();
+    }
+
+    public interface PasswordChangedListener {
+        void onPasswordChanged(String newPassword);
+
+        String getPassword();
+    }
+
+    private String localPassword = null;
+
+    private String getPassword() {
+        if (passwordCallback != null) return passwordCallback.getPassword();
+        return localPassword;
+    }
+
+    private void setPassword(String password) {
+        if (passwordCallback != null) passwordCallback.onPasswordChanged(password);
+        else localPassword = password;
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.activityCallback = (Listener) context;
+        }
+        if (context instanceof ProgressListener) {
+            this.progressCallback = (ProgressListener) context;
+        }
+        if (context instanceof AcceptListener) {
+            this.acceptCallback = (AcceptListener) context;
+        }
+        if (context instanceof ListenerWithWallet) {
+            this.walletCallback = (ListenerWithWallet) context;
+        }
+        if (context instanceof PasswordChangedListener) {
+            this.passwordCallback = (PasswordChangedListener) context;
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setTitle(walletName, getString(R.string.details_title));
+        activityCallback.setToolbarButton(
+                GenerateReviewFragment.VIEW_TYPE_ACCEPT.equals(type) ? Toolbar.BUTTON_NONE : Toolbar.BUTTON_BACK);
+    }
+
+    public void showProgress() {
+        pbProgress.setVisibility(View.VISIBLE);
+    }
+
+    public void hideProgress() {
+        pbProgress.setVisibility(View.INVISIBLE);
+    }
+
+    boolean backOk() {
+        return !type.equals(GenerateReviewFragment.VIEW_TYPE_ACCEPT);
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
+        String type = getArguments().getString(REQUEST_TYPE); // intance variable <type> not set yet
+        if (GenerateReviewFragment.VIEW_TYPE_ACCEPT.equals(type)) {
+            inflater.inflate(R.menu.wallet_details_help_menu, menu);
+            super.onCreateOptionsMenu(menu, inflater);
+        } else {
+            inflater.inflate(R.menu.wallet_details_menu, menu);
+            super.onCreateOptionsMenu(menu, inflater);
+        }
+    }
+
+    boolean changeWalletPassword(String newPassword) {
+        Wallet wallet;
+        boolean closeWallet;
+        if (type.equals(GenerateReviewFragment.VIEW_TYPE_WALLET)) {
+            wallet = GenerateReviewFragment.this.walletCallback.getWallet();
+            closeWallet = false;
+        } else {
+            wallet = WalletManager.getInstance().openWallet(walletPath, getPassword());
+            closeWallet = true;
+        }
+
+        boolean ok = false;
+        Wallet.Status walletStatus = wallet.getStatus();
+        if (walletStatus.isOk()) {
+            wallet.setPassword(newPassword);
+            ok = true;
+        }
+        if (closeWallet) wallet.close();
+        return ok;
+    }
+
+    private class AsyncChangePassword extends AsyncTask<String, Void, Boolean> {
+        String newPassword;
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            if (progressCallback != null)
+                progressCallback.showProgressDialog(R.string.changepw_progress);
+        }
+
+        @Override
+        protected Boolean doInBackground(String... params) {
+            if (params.length != 2) return false;
+            final String userPassword = params[0];
+            final boolean fingerPassValid = Boolean.parseBoolean(params[1]);
+            newPassword = KeyStoreHelper.getCrazyPass(getActivity(), userPassword);
+            final boolean success = changeWalletPassword(newPassword);
+            if (success) {
+                Context ctx = getActivity();
+                if (ctx != null)
+                    if (fingerPassValid) {
+                        KeyStoreHelper.saveWalletUserPass(ctx, walletName, userPassword);
+                    } else {
+                        KeyStoreHelper.removeWalletUserPass(ctx, walletName);
+                    }
+            }
+            return success;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            super.onPostExecute(result);
+            if ((getActivity() == null) || getActivity().isDestroyed()) {
+                return;
+            }
+            if (progressCallback != null)
+                progressCallback.dismissProgressDialog();
+            if (result) {
+                Toast.makeText(getActivity(), getString(R.string.changepw_success), Toast.LENGTH_SHORT).show();
+                setPassword(newPassword);
+                showDetails();
+            } else {
+                Toast.makeText(getActivity(), getString(R.string.changepw_failed), Toast.LENGTH_LONG).show();
+            }
+        }
+    }
+
+    AlertDialog openDialog = null; // for preventing opening of multiple dialogs
+
+    public AlertDialog createChangePasswordDialog() {
+        if (openDialog != null) return null; // we are already open
+        LayoutInflater li = LayoutInflater.from(getActivity());
+        View promptsView = li.inflate(R.layout.prompt_changepw, null);
+
+        AlertDialog.Builder alertDialogBuilder = new MaterialAlertDialogBuilder(requireActivity());
+        alertDialogBuilder.setView(promptsView);
+
+        final PasswordEntryView etPasswordA = promptsView.findViewById(R.id.etWalletPasswordA);
+        etPasswordA.setHint(getString(R.string.prompt_changepw, walletName));
+
+        final TextInputLayout etPasswordB = promptsView.findViewById(R.id.etWalletPasswordB);
+        etPasswordB.setHint(getString(R.string.prompt_changepwB, walletName));
+
+        LinearLayout llFingerprintAuth = promptsView.findViewById(R.id.llFingerprintAuth);
+        final SwitchMaterial swFingerprintAllowed = (SwitchMaterial) llFingerprintAuth.getChildAt(0);
+        if (FingerprintHelper.isDeviceSupported(getActivity())) {
+            llFingerprintAuth.setVisibility(View.VISIBLE);
+
+            swFingerprintAllowed.setOnClickListener(view -> {
+                if (!swFingerprintAllowed.isChecked()) return;
+
+                AlertDialog.Builder builder = new MaterialAlertDialogBuilder(requireActivity());
+                builder.setMessage(Html.fromHtml(getString(R.string.generate_fingerprint_warn)))
+                        .setCancelable(false)
+                        .setPositiveButton(getString(R.string.label_ok), null)
+                        .setNegativeButton(getString(R.string.label_cancel), new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialogInterface, int i) {
+                                swFingerprintAllowed.setChecked(false);
+                            }
+                        })
+                        .show();
+            });
+
+            swFingerprintAllowed.setChecked(FingerprintHelper.isFingerPassValid(getActivity(), walletName));
+        }
+
+        etPasswordA.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable s) {
+                if (etPasswordB.getError() != null) {
+                    etPasswordB.setError(null);
+                }
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start,
+                                          int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start,
+                                      int before, int count) {
+            }
+        });
+
+        etPasswordB.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable s) {
+                if (etPasswordB.getError() != null) {
+                    etPasswordB.setError(null);
+                }
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start,
+                                          int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start,
+                                      int before, int count) {
+            }
+        });
+
+        // set dialog message
+        alertDialogBuilder
+                .setCancelable(false)
+                .setPositiveButton(getString(R.string.label_ok), null)
+                .setNegativeButton(getString(R.string.label_cancel),
+                        new DialogInterface.OnClickListener() {
+                            public void onClick(DialogInterface dialog, int id) {
+                                Helper.hideKeyboardAlways(requireActivity());
+                                dialog.cancel();
+                                openDialog = null;
+                            }
+                        });
+
+        openDialog = alertDialogBuilder.create();
+        openDialog.setOnShowListener(dialog -> {
+            Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
+            button.setOnClickListener(view -> {
+                String newPasswordA = etPasswordA.getEditText().getText().toString();
+                String newPasswordB = etPasswordB.getEditText().getText().toString();
+                if (!newPasswordA.equals(newPasswordB)) {
+                    etPasswordB.setError(getString(R.string.generate_bad_passwordB));
+                } else {
+                    new AsyncChangePassword().execute(newPasswordA, Boolean.toString(swFingerprintAllowed.isChecked()));
+                    Helper.hideKeyboardAlways(requireActivity());
+                    openDialog.dismiss();
+                    openDialog = null;
+                }
+            });
+        });
+
+        // accept keyboard "ok"
+        etPasswordB.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+            if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                    || (actionId == EditorInfo.IME_ACTION_DONE)) {
+                String newPasswordA = etPasswordA.getEditText().getText().toString();
+                String newPasswordB = etPasswordB.getEditText().getText().toString();
+                // disallow empty passwords
+                if (!newPasswordA.equals(newPasswordB)) {
+                    etPasswordB.setError(getString(R.string.generate_bad_passwordB));
+                } else {
+                    new AsyncChangePassword().execute(newPasswordA, Boolean.toString(swFingerprintAllowed.isChecked()));
+                    Helper.hideKeyboardAlways(requireActivity());
+                    openDialog.dismiss();
+                    openDialog = null;
+                }
+                return true;
+            }
+            return false;
+        });
+
+        if (Helper.preventScreenshot()) {
+            openDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+
+        return openDialog;
+    }
+
+    private boolean isKeyValid(String key) {
+        return (key != null) && (key.length() == 64)
+                && !key.equals("0000000000000000000000000000000000000000000000000000000000000000")
+                && !key.toLowerCase().equals("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+        // ledger implmenetation returns the spend key as f's
+    }
+
+    private class AsyncShowSeed extends AsyncTask<String, Void, Boolean> {
+        String seed;
+        String offset;
+        Wallet.Status walletStatus;
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            offset = getSeedOffset();
+            flWalletMnemonic.setAlpha(0.1f);
+        }
+
+        @Override
+        protected Boolean doInBackground(String... params) {
+            if (params.length != 1) return false;
+            String walletPath = params[0];
+
+            Wallet wallet;
+            boolean closeWallet;
+            if (type.equals(GenerateReviewFragment.VIEW_TYPE_WALLET)) {
+                wallet = GenerateReviewFragment.this.walletCallback.getWallet();
+                closeWallet = false;
+            } else {
+                wallet = WalletManager.getInstance().openWallet(walletPath, getPassword());
+                closeWallet = true;
+            }
+            walletStatus = wallet.getStatus();
+            if (!walletStatus.isOk()) {
+                if (closeWallet) wallet.close();
+                return false;
+            }
+
+            seed = wallet.getSeed(offset);
+            if (closeWallet) wallet.close();
+            return true;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            super.onPostExecute(result);
+            if (!isAdded()) return; // never mind
+            if (result) {
+                if (!seed.isEmpty()) {
+                    llMnemonic.setVisibility(View.VISIBLE);
+                    tvWalletMnemonic.setText(seed);
+                }
+            } else {
+                tvWalletMnemonic.setText(walletStatus.toString());
+            }
+            seedOffsetInProgress = false;
+            if (!getSeedOffset().equals(offset)) { // make sure we have encrypted with the correct offset
+                showSeed(); // seed has changed in the meantime - recalc
+            } else
+                flWalletMnemonic.setAlpha(1);
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/LoginFragment.java

@@ -0,0 +1,563 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.text.Html;
+import android.text.Spanned;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.animation.Animation;
+import android.view.animation.AnimationUtils;
+import android.widget.FrameLayout;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.RelativeLayout;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.google.android.material.floatingactionbutton.FloatingActionButton;
+import com.google.android.material.progressindicator.CircularProgressIndicator;
+import com.m2049r.xmrwallet.data.NodeInfo;
+import com.m2049r.xmrwallet.dialog.HelpFragment;
+import com.m2049r.xmrwallet.layout.WalletInfoAdapter;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.KeyStoreHelper;
+import com.m2049r.xmrwallet.util.NetCipherHelper;
+import com.m2049r.xmrwallet.util.NodePinger;
+import com.m2049r.xmrwallet.util.Notice;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+
+import timber.log.Timber;
+
+public class LoginFragment extends Fragment implements WalletInfoAdapter.OnInteractionListener,
+        View.OnClickListener {
+
+    private WalletInfoAdapter adapter;
+
+    private final List<WalletManager.WalletInfo> walletList = new ArrayList<>();
+
+    private View tvGuntherSays;
+    private ImageView ivGunther;
+    private TextView tvNodeName;
+    private TextView tvNodeInfo;
+    private ImageButton ibNetwork;
+    private CircularProgressIndicator pbNetwork;
+
+    private Listener activityCallback;
+
+    // Container Activity must implement this interface
+    public interface Listener {
+        File getStorageRoot();
+
+        boolean onWalletSelected(String wallet, boolean streetmode);
+
+        void onWalletDetails(String wallet);
+
+        void onWalletRename(String name);
+
+        void onWalletBackup(String name);
+
+        void onWalletRestore();
+
+        void onWalletDelete(String walletName);
+
+        void onWalletDeleteCache(String walletName);
+
+        void onAddWallet(String type);
+
+        void onNodePrefs();
+
+        void showNet();
+
+        void setToolbarButton(int type);
+
+        void setTitle(String title);
+
+        void setNode(NodeInfo node);
+
+        NodeInfo getNode();
+
+        Set<NodeInfo> getFavouriteNodes();
+
+        Set<NodeInfo> getOrPopulateFavourites();
+
+        boolean hasLedger();
+
+        void runOnNetCipher(Runnable runnable);
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.activityCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        Timber.d("onPause()");
+        torStatus = null;
+        super.onPause();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume() %s", activityCallback.getFavouriteNodes().size());
+        activityCallback.setTitle(null);
+        activityCallback.setToolbarButton(Toolbar.BUTTON_SETTINGS);
+        activityCallback.showNet();
+        showNetwork();
+        //activityCallback.runOnNetCipher(this::pingSelectedNode);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        Timber.d("onCreateView");
+        View view = inflater.inflate(R.layout.fragment_login, container, false);
+
+        tvGuntherSays = view.findViewById(R.id.tvGuntherSays);
+        ivGunther = view.findViewById(R.id.ivGunther);
+        fabScreen = view.findViewById(R.id.fabScreen);
+        fab = view.findViewById(R.id.fab);
+        fabNew = view.findViewById(R.id.fabNew);
+        fabView = view.findViewById(R.id.fabView);
+        fabKey = view.findViewById(R.id.fabKey);
+        fabSeed = view.findViewById(R.id.fabSeed);
+        fabImport = view.findViewById(R.id.fabImport);
+        fabLedger = view.findViewById(R.id.fabLedger);
+
+        fabNewL = view.findViewById(R.id.fabNewL);
+        fabViewL = view.findViewById(R.id.fabViewL);
+        fabKeyL = view.findViewById(R.id.fabKeyL);
+        fabSeedL = view.findViewById(R.id.fabSeedL);
+        fabImportL = view.findViewById(R.id.fabImportL);
+        fabLedgerL = view.findViewById(R.id.fabLedgerL);
+
+        fab_pulse = AnimationUtils.loadAnimation(getContext(), R.anim.fab_pulse);
+        fab_open_screen = AnimationUtils.loadAnimation(getContext(), R.anim.fab_open_screen);
+        fab_close_screen = AnimationUtils.loadAnimation(getContext(), R.anim.fab_close_screen);
+        fab_open = AnimationUtils.loadAnimation(getContext(), R.anim.fab_open);
+        fab_close = AnimationUtils.loadAnimation(getContext(), R.anim.fab_close);
+        rotate_forward = AnimationUtils.loadAnimation(getContext(), R.anim.rotate_forward);
+        rotate_backward = AnimationUtils.loadAnimation(getContext(), R.anim.rotate_backward);
+        fab.setOnClickListener(this);
+        fabNew.setOnClickListener(this);
+        fabView.setOnClickListener(this);
+        fabKey.setOnClickListener(this);
+        fabSeed.setOnClickListener(this);
+        fabImport.setOnClickListener(this);
+        fabLedger.setOnClickListener(this);
+        fabScreen.setOnClickListener(this);
+
+        RecyclerView recyclerView = view.findViewById(R.id.list);
+        registerForContextMenu(recyclerView);
+        this.adapter = new WalletInfoAdapter(getActivity(), this);
+        recyclerView.setAdapter(adapter);
+
+        ViewGroup llNotice = view.findViewById(R.id.llNotice);
+        Notice.showAll(llNotice, ".*_login");
+
+        view.findViewById(R.id.llNode).setOnClickListener(v -> startNodePrefs());
+        tvNodeName = view.findViewById(R.id.tvNodeName);
+        tvNodeInfo = view.findViewById(R.id.tvInfo);
+        view.findViewById(R.id.ibRenew).setOnClickListener(v -> findBestNode());
+        ibNetwork = view.findViewById(R.id.ibNetwork);
+        ibNetwork.setOnClickListener(v -> changeNetwork());
+        ibNetwork.setEnabled(false);
+        pbNetwork = view.findViewById(R.id.pbNetwork);
+
+        Helper.hideKeyboard(getActivity());
+
+        loadList();
+
+        return view;
+    }
+
+    // Callbacks from WalletInfoAdapter
+
+    // Wallet touched
+    @Override
+    public void onInteraction(final View view, final WalletManager.WalletInfo infoItem) {
+        openWallet(infoItem.getName(), false);
+    }
+
+    private void openWallet(String name, boolean streetmode) {
+        activityCallback.onWalletSelected(name, streetmode);
+    }
+
+    @Override
+    public boolean onContextInteraction(MenuItem item, WalletManager.WalletInfo listItem) {
+        final int id = item.getItemId();
+        if (id == R.id.action_streetmode) {
+            openWallet(listItem.getName(), true);
+        } else if (id == R.id.action_info) {
+            showInfo(listItem.getName());
+        } else if (id == R.id.action_rename) {
+            activityCallback.onWalletRename(listItem.getName());
+        } else if (id == R.id.action_backup) {
+            activityCallback.onWalletBackup(listItem.getName());
+        } else if (id == R.id.action_archive) {
+            activityCallback.onWalletDelete(listItem.getName());
+        } else if (id == R.id.action_deletecache) {
+            activityCallback.onWalletDeleteCache(listItem.getName());
+        } else {
+            return super.onContextItemSelected(item);
+        }
+        return true;
+    }
+
+    public void loadList() {
+        Timber.d("loadList()");
+        WalletManager mgr = WalletManager.getInstance();
+        walletList.clear();
+        walletList.addAll(mgr.findWallets(activityCallback.getStorageRoot()));
+        adapter.setInfos(walletList);
+
+        // deal with Gunther & FAB animation
+        if (walletList.isEmpty()) {
+            fab.startAnimation(fab_pulse);
+            if (ivGunther.getDrawable() == null) {
+                ivGunther.setImageResource(R.drawable.ic_emptygunther);
+                tvGuntherSays.setVisibility(View.VISIBLE);
+            }
+        } else {
+            fab.clearAnimation();
+            if (ivGunther.getDrawable() != null) {
+                ivGunther.setImageDrawable(null);
+            }
+            tvGuntherSays.setVisibility(View.GONE);
+        }
+
+        // remove information of non-existent wallet
+        Set<String> removedWallets = getActivity()
+                .getSharedPreferences(KeyStoreHelper.SecurityConstants.WALLET_PASS_PREFS_NAME, Context.MODE_PRIVATE)
+                .getAll().keySet();
+        for (WalletManager.WalletInfo s : walletList) {
+            removedWallets.remove(s.getName());
+        }
+        for (String name : removedWallets) {
+            KeyStoreHelper.removeWalletUserPass(getActivity(), name);
+        }
+    }
+
+    private void showInfo(@NonNull String name) {
+        activityCallback.onWalletDetails(name);
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.list_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    private boolean isFabOpen = false;
+    private FloatingActionButton fab, fabNew, fabView, fabKey, fabSeed, fabImport, fabLedger;
+    private RelativeLayout fabScreen;
+    private RelativeLayout fabNewL, fabViewL, fabKeyL, fabSeedL, fabImportL, fabLedgerL;
+    private Animation fab_open, fab_close, rotate_forward, rotate_backward, fab_open_screen, fab_close_screen;
+    private Animation fab_pulse;
+
+    public boolean isFabOpen() {
+        return isFabOpen;
+    }
+
+    public void animateFAB() {
+        if (isFabOpen) { // close the fab
+            fabScreen.setClickable(false);
+            fabScreen.startAnimation(fab_close_screen);
+            fab.startAnimation(rotate_backward);
+            if (fabLedgerL.getVisibility() == View.VISIBLE) {
+                fabLedgerL.startAnimation(fab_close);
+                fabLedger.setClickable(false);
+            } else {
+                fabNewL.startAnimation(fab_close);
+                fabNew.setClickable(false);
+                fabViewL.startAnimation(fab_close);
+                fabView.setClickable(false);
+                fabKeyL.startAnimation(fab_close);
+                fabKey.setClickable(false);
+                fabSeedL.startAnimation(fab_close);
+                fabSeed.setClickable(false);
+                fabImportL.startAnimation(fab_close);
+                fabImport.setClickable(false);
+            }
+            isFabOpen = false;
+        } else { // open the fab
+            fabScreen.setClickable(true);
+            fabScreen.startAnimation(fab_open_screen);
+            fab.startAnimation(rotate_forward);
+            if (activityCallback.hasLedger()) {
+                fabLedgerL.setVisibility(View.VISIBLE);
+                fabNewL.setVisibility(View.GONE);
+                fabViewL.setVisibility(View.GONE);
+                fabKeyL.setVisibility(View.GONE);
+                fabSeedL.setVisibility(View.GONE);
+                fabImportL.setVisibility(View.GONE);
+
+                fabLedgerL.startAnimation(fab_open);
+                fabLedger.setClickable(true);
+            } else {
+                fabLedgerL.setVisibility(View.GONE);
+                fabNewL.setVisibility(View.VISIBLE);
+                fabViewL.setVisibility(View.VISIBLE);
+                fabKeyL.setVisibility(View.VISIBLE);
+                fabSeedL.setVisibility(View.VISIBLE);
+                fabImportL.setVisibility(View.VISIBLE);
+
+                fabNewL.startAnimation(fab_open);
+                fabNew.setClickable(true);
+                fabViewL.startAnimation(fab_open);
+                fabView.setClickable(true);
+                fabKeyL.startAnimation(fab_open);
+                fabKey.setClickable(true);
+                fabSeedL.startAnimation(fab_open);
+                fabSeed.setClickable(true);
+                fabImportL.startAnimation(fab_open);
+                fabImport.setClickable(true);
+            }
+            isFabOpen = true;
+        }
+    }
+
+    @Override
+    public void onClick(View v) {
+        final int id = v.getId();
+        Timber.d("onClick %d/%d", id, R.id.fabLedger);
+        if (id == R.id.fab) {
+            animateFAB();
+        } else if (id == R.id.fabNew) {
+            fabScreen.setVisibility(View.INVISIBLE);
+            isFabOpen = false;
+            activityCallback.onAddWallet(GenerateFragment.TYPE_NEW);
+        } else if (id == R.id.fabView) {
+            animateFAB();
+            activityCallback.onAddWallet(GenerateFragment.TYPE_VIEWONLY);
+        } else if (id == R.id.fabKey) {
+            animateFAB();
+            activityCallback.onAddWallet(GenerateFragment.TYPE_KEY);
+        } else if (id == R.id.fabSeed) {
+            animateFAB();
+            activityCallback.onAddWallet(GenerateFragment.TYPE_SEED);
+        } else if (id == R.id.fabImport) {
+            animateFAB();
+            activityCallback.onWalletRestore();
+        } else if (id == R.id.fabLedger) {
+            Timber.d("FAB_LEDGER");
+            animateFAB();
+            activityCallback.onAddWallet(GenerateFragment.TYPE_LEDGER);
+        } else if (id == R.id.fabScreen) {
+            animateFAB();
+        }
+    }
+
+    public void findBestNode() {
+        new AsyncFindBestNode().execute(AsyncFindBestNode.FIND_BEST);
+    }
+
+    public void pingSelectedNode() {
+        new AsyncFindBestNode().execute(AsyncFindBestNode.PING_SELECTED);
+    }
+
+    private NodeInfo autoselect(Set<NodeInfo> nodes) {
+        if (nodes.isEmpty()) return null;
+        NodePinger.execute(nodes, null);
+        List<NodeInfo> nodeList = new ArrayList<>(nodes);
+        Collections.sort(nodeList, NodeInfo.BestNodeComparator);
+        return nodeList.get(0);
+    }
+
+    private void setSubtext(String status) {
+        final Context ctx = getContext();
+        final Spanned text = Html.fromHtml(ctx.getString(R.string.status,
+                Integer.toHexString(ThemeHelper.getThemedColor(ctx, R.attr.positiveColor) & 0xFFFFFF),
+                Integer.toHexString(ThemeHelper.getThemedColor(ctx, android.R.attr.colorBackground) & 0xFFFFFF),
+                status, ""));
+        tvNodeInfo.setText(text);
+    }
+
+    private class AsyncFindBestNode extends AsyncTask<Integer, Void, NodeInfo> {
+        final static int PING_SELECTED = 0;
+        final static int FIND_BEST = 1;
+
+        private boolean netState;
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            tvNodeName.setVisibility(View.GONE);
+            pbNetwork.setVisibility(View.VISIBLE);
+            netState = ibNetwork.isClickable();
+            ibNetwork.setClickable(false);
+            setSubtext(getString(R.string.node_waiting));
+        }
+
+        @Override
+        protected NodeInfo doInBackground(Integer... params) {
+            Set<NodeInfo> favourites = activityCallback.getOrPopulateFavourites();
+            NodeInfo selectedNode;
+            if (params[0] == FIND_BEST) {
+                selectedNode = autoselect(favourites);
+            } else if (params[0] == PING_SELECTED) {
+                selectedNode = activityCallback.getNode();
+                if (!activityCallback.getFavouriteNodes().contains(selectedNode))
+                    selectedNode = null; // it's not in the favourites (any longer)
+                if (selectedNode == null)
+                    for (NodeInfo node : favourites) {
+                        if (node.isSelected()) {
+                            selectedNode = node;
+                            break;
+                        }
+                    }
+                if (selectedNode == null) { // autoselect
+                    selectedNode = autoselect(favourites);
+                } else {
+                    selectedNode.testRpcService();
+                }
+            } else throw new IllegalStateException();
+            if ((selectedNode != null) && selectedNode.isValid()) {
+                activityCallback.setNode(selectedNode);
+                return selectedNode;
+            } else {
+                activityCallback.setNode(null);
+                return null;
+            }
+        }
+
+        @Override
+        protected void onPostExecute(NodeInfo result) {
+            if (!isAdded()) return;
+            tvNodeName.setVisibility(View.VISIBLE);
+            pbNetwork.setVisibility(View.INVISIBLE);
+            ibNetwork.setClickable(netState);
+            if (result != null) {
+                Timber.d("found a good node %s", result.toString());
+                showNode(result);
+            } else {
+                tvNodeName.setText(getResources().getText(R.string.node_create_hint));
+                tvNodeName.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
+                tvNodeInfo.setText(null);
+                tvNodeInfo.setVisibility(View.GONE);
+            }
+        }
+
+        @Override
+        protected void onCancelled(NodeInfo result) { //TODO: cancel this on exit from fragment
+            Timber.d("cancelled with %s", result);
+        }
+    }
+
+    private void showNode(NodeInfo nodeInfo) {
+        tvNodeName.setText(nodeInfo.getName());
+        nodeInfo.showInfo(tvNodeInfo);
+        tvNodeInfo.setVisibility(View.VISIBLE);
+    }
+
+    private void startNodePrefs() {
+        activityCallback.onNodePrefs();
+    }
+
+    // Network (Tor) stuff
+
+    private void changeNetwork() {
+        Timber.d("S: %s", NetCipherHelper.getStatus());
+        final NetCipherHelper.Status status = NetCipherHelper.getStatus();
+        if (status == NetCipherHelper.Status.NOT_INSTALLED) {
+            HelpFragment.display(requireActivity().getSupportFragmentManager(), R.string.help_tor);
+        } else if (status == NetCipherHelper.Status.NOT_ENABLED) {
+            Toast.makeText(getActivity(), getString(R.string.tor_enable_background), Toast.LENGTH_LONG).show();
+        } else {
+            pbNetwork.setVisibility(View.VISIBLE);
+            ibNetwork.setEnabled(false);
+            NetCipherHelper.getInstance().toggle();
+        }
+    }
+
+    private NetCipherHelper.Status torStatus = null;
+
+    void showNetwork() {
+        final NetCipherHelper.Status status = NetCipherHelper.getStatus();
+        Timber.d("SHOW %s", status);
+        if (status == torStatus) return;
+        torStatus = status;
+        switch (status) {
+            case ENABLED:
+                ibNetwork.setImageResource(R.drawable.ic_network_tor_on);
+                ibNetwork.setEnabled(true);
+                ibNetwork.setClickable(true);
+                pbNetwork.setVisibility(View.INVISIBLE);
+                break;
+            case NOT_ENABLED:
+            case DISABLED:
+                ibNetwork.setImageResource(R.drawable.ic_network_clearnet);
+                ibNetwork.setEnabled(true);
+                ibNetwork.setClickable(true);
+                pbNetwork.setVisibility(View.INVISIBLE);
+                break;
+            case STARTING:
+                ibNetwork.setImageResource(R.drawable.ic_network_clearnet);
+                ibNetwork.setEnabled(false);
+                pbNetwork.setVisibility(View.VISIBLE);
+                break;
+            case STOPPING:
+                ibNetwork.setImageResource(R.drawable.ic_network_clearnet);
+                ibNetwork.setEnabled(false);
+                pbNetwork.setVisibility(View.VISIBLE);
+                break;
+            case NOT_INSTALLED:
+                ibNetwork.setEnabled(true);
+                ibNetwork.setClickable(true);
+                pbNetwork.setVisibility(View.INVISIBLE);
+                ibNetwork.setImageResource(R.drawable.ic_network_clearnet);
+                break;
+            default:
+                return;
+        }
+        activityCallback.runOnNetCipher(this::pingSelectedNode);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/MainActivity.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018-2020 EarlOfEgo, m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Intent;
+import android.os.Bundle;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.m2049r.xmrwallet.onboarding.OnBoardingActivity;
+import com.m2049r.xmrwallet.onboarding.OnBoardingManager;
+
+public class MainActivity extends BaseActivity {
+    @Override
+    protected void onCreate(@Nullable final Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        if (OnBoardingManager.shouldShowOnBoarding(getApplicationContext())) {
+            startActivity(new Intent(this, OnBoardingActivity.class));
+        } else {
+            startActivity(new Intent(this, LoginActivity.class));
+        }
+        finish();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/NodeFragment.java

@@ -0,0 +1,589 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.content.DialogInterface;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.WindowManager;
+import android.view.inputmethod.EditorInfo;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AlertDialog;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.textfield.TextInputLayout;
+import com.m2049r.levin.scanner.Dispatcher;
+import com.m2049r.xmrwallet.data.DefaultNodes;
+import com.m2049r.xmrwallet.data.Node;
+import com.m2049r.xmrwallet.data.NodeInfo;
+import com.m2049r.xmrwallet.layout.NodeInfoAdapter;
+import com.m2049r.xmrwallet.model.NetworkType;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.NodePinger;
+import com.m2049r.xmrwallet.util.Notice;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.io.File;
+import java.net.InetSocketAddress;
+import java.net.UnknownHostException;
+import java.text.NumberFormat;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Set;
+
+import timber.log.Timber;
+
+public class NodeFragment extends Fragment
+        implements NodeInfoAdapter.OnInteractionListener, View.OnClickListener {
+
+    static private int NODES_TO_FIND = 10;
+
+    static private NumberFormat FORMATTER = NumberFormat.getInstance();
+
+    private SwipeRefreshLayout pullToRefresh;
+    private TextView tvPull;
+    private View fab;
+
+    private Set<NodeInfo> nodeList = new HashSet<>();
+
+    private NodeInfoAdapter nodesAdapter;
+
+    private Listener activityCallback;
+
+    public interface Listener {
+        File getStorageRoot();
+
+        void setToolbarButton(int type);
+
+        void setSubtitle(String title);
+
+        Set<NodeInfo> getFavouriteNodes();
+
+        Set<NodeInfo> getOrPopulateFavourites();
+
+        void setFavouriteNodes(Collection<NodeInfo> favouriteNodes);
+
+        void setNode(NodeInfo node);
+    }
+
+    void filterFavourites() {
+        for (Iterator<NodeInfo> iter = nodeList.iterator(); iter.hasNext(); ) {
+            Node node = iter.next();
+            if (!node.isFavourite()) iter.remove();
+        }
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.activityCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        Timber.d("onPause() %d", nodeList.size());
+        if (asyncFindNodes != null)
+            asyncFindNodes.cancel(true);
+        if (activityCallback != null)
+            activityCallback.setFavouriteNodes(nodeList);
+        super.onPause();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setSubtitle(getString(R.string.label_nodes));
+        updateRefreshElements();
+    }
+
+    boolean isRefreshing() {
+        return asyncFindNodes != null;
+    }
+
+    void updateRefreshElements() {
+        if (isRefreshing()) {
+            activityCallback.setToolbarButton(Toolbar.BUTTON_NONE);
+            fab.setVisibility(View.GONE);
+        } else {
+            activityCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+            fab.setVisibility(View.VISIBLE);
+        }
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        Timber.d("onCreateView");
+        View view = inflater.inflate(R.layout.fragment_node, container, false);
+
+        fab = view.findViewById(R.id.fab);
+        fab.setOnClickListener(this);
+
+        RecyclerView recyclerView = view.findViewById(R.id.list);
+        nodesAdapter = new NodeInfoAdapter(getActivity(), this);
+        recyclerView.setAdapter(nodesAdapter);
+
+        tvPull = view.findViewById(R.id.tvPull);
+
+        pullToRefresh = view.findViewById(R.id.pullToRefresh);
+        pullToRefresh.setOnRefreshListener(() -> {
+            if (WalletManager.getInstance().getNetworkType() == NetworkType.NetworkType_Mainnet) {
+                refresh(AsyncFindNodes.SCAN);
+            } else {
+                Toast.makeText(getActivity(), getString(R.string.node_wrong_net), Toast.LENGTH_LONG).show();
+                pullToRefresh.setRefreshing(false);
+            }
+        });
+
+        Helper.hideKeyboard(getActivity());
+
+        nodeList = new HashSet<>(activityCallback.getFavouriteNodes());
+        nodesAdapter.setNodes(nodeList);
+
+        ViewGroup llNotice = view.findViewById(R.id.llNotice);
+        Notice.showAll(llNotice, ".*_nodes");
+
+        refresh(AsyncFindNodes.PING); // start connection tests
+
+        return view;
+    }
+
+    private AsyncFindNodes asyncFindNodes = null;
+
+    private boolean refresh(int type) {
+        if (asyncFindNodes != null) return false; // ignore refresh request as one is ongoing
+        asyncFindNodes = new AsyncFindNodes();
+        updateRefreshElements();
+        asyncFindNodes.execute(type);
+        return true;
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.node_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    // Callbacks from NodeInfoAdapter
+    @Override
+    public void onInteraction(final View view, final NodeInfo nodeItem) {
+        Timber.d("onInteraction");
+        if (!nodeItem.isFavourite()) {
+            nodeItem.setFavourite(true);
+            activityCallback.setFavouriteNodes(nodeList);
+        }
+        AsyncTask.execute(() -> {
+            activityCallback.setNode(nodeItem); // this marks it as selected & saves it as well
+            nodeItem.setSelecting(false);
+            try {
+                requireActivity().runOnUiThread(() -> nodesAdapter.allowClick(true));
+            } catch (IllegalStateException ex) {
+                // it's ok
+            }
+        });
+    }
+
+    // open up edit dialog
+    @Override
+    public boolean onLongInteraction(final View view, final NodeInfo nodeItem) {
+        Timber.d("onLongInteraction");
+        EditDialog diag = createEditDialog(nodeItem);
+        if (diag != null) {
+            diag.show();
+        }
+        return true;
+    }
+
+    @Override
+    public void onClick(View v) {
+        int id = v.getId();
+        if (id == R.id.fab) {
+            EditDialog diag = createEditDialog(null);
+            if (diag != null) {
+                diag.show();
+            }
+        }
+    }
+
+    private class AsyncFindNodes extends AsyncTask<Integer, NodeInfo, Boolean>
+            implements NodePinger.Listener {
+        final static int SCAN = 0;
+        final static int RESTORE_DEFAULTS = 1;
+        final static int PING = 2;
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            filterFavourites();
+            nodesAdapter.setNodes(null);
+            nodesAdapter.allowClick(false);
+            tvPull.setText(getString(R.string.node_scanning));
+        }
+
+        @Override
+        protected Boolean doInBackground(Integer... params) {
+            if (params[0] == RESTORE_DEFAULTS) { // true = restore defaults
+                for (DefaultNodes node : DefaultNodes.values()) {
+                    NodeInfo nodeInfo = NodeInfo.fromString(node.getUri());
+                    if (nodeInfo != null) {
+                        nodeInfo.setFavourite(true);
+                        nodeList.add(nodeInfo);
+                    }
+                }
+                NodePinger.execute(nodeList, this);
+                return true;
+            } else if (params[0] == PING) {
+                NodePinger.execute(nodeList, this);
+                return true;
+            } else if (params[0] == SCAN) {
+                // otherwise scan the network
+                Timber.d("scanning");
+                Set<NodeInfo> seedList = new HashSet<>();
+                seedList.addAll(nodeList);
+                nodeList.clear();
+                Timber.d("seed %d", seedList.size());
+                Dispatcher d = new Dispatcher(info -> publishProgress(info));
+                d.seedPeers(seedList);
+                d.awaitTermination(NODES_TO_FIND);
+
+                // we didn't find enough because we didn't ask around enough? ask more!
+                if ((d.getRpcNodes().size() < NODES_TO_FIND) &&
+                        (d.getPeerCount() < NODES_TO_FIND + seedList.size())) {
+                    // try again
+                    publishProgress((NodeInfo[]) null);
+                    d = new Dispatcher(new Dispatcher.Listener() {
+                        @Override
+                        public void onGet(NodeInfo info) {
+                            publishProgress(info);
+                        }
+                    });
+                    // also seed with monero seed nodes (see p2p/net_node.inl:410 in monero src)
+                    seedList.add(new NodeInfo(new InetSocketAddress("107.152.130.98", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("212.83.175.67", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("5.9.100.248", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("163.172.182.165", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("161.67.132.39", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("198.74.231.92", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("195.154.123.123", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("212.83.172.165", 18080)));
+                    seedList.add(new NodeInfo(new InetSocketAddress("192.110.160.146", 18080)));
+                    d.seedPeers(seedList);
+                    d.awaitTermination(NODES_TO_FIND);
+                }
+                // final (filtered) result
+                nodeList.addAll(d.getRpcNodes());
+                return true;
+            }
+            return false;
+        }
+
+        @Override
+        protected void onProgressUpdate(NodeInfo... values) {
+            Timber.d("onProgressUpdate");
+            if (!isCancelled())
+                if (values != null)
+                    nodesAdapter.addNode(values[0]);
+                else
+                    nodesAdapter.setNodes(null);
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            Timber.d("done scanning");
+            complete();
+        }
+
+        @Override
+        protected void onCancelled(Boolean result) {
+            Timber.d("cancelled scanning");
+            complete();
+        }
+
+        private void complete() {
+            asyncFindNodes = null;
+            if (!isAdded()) return;
+            //if (isCancelled()) return;
+            tvPull.setText(getString(R.string.node_pull_hint));
+            pullToRefresh.setRefreshing(false);
+            nodesAdapter.setNodes(nodeList);
+            nodesAdapter.allowClick(true);
+            updateRefreshElements();
+        }
+
+        public void publish(NodeInfo nodeInfo) {
+            publishProgress(nodeInfo);
+        }
+    }
+
+    @Override
+    public void onDetach() {
+        Timber.d("detached");
+        super.onDetach();
+    }
+
+    private EditDialog editDialog = null; // for preventing opening of multiple dialogs
+
+    private EditDialog createEditDialog(final NodeInfo nodeInfo) {
+        if (editDialog != null) return null; // we are already open
+        editDialog = new EditDialog(nodeInfo);
+        return editDialog;
+    }
+
+    class EditDialog {
+        final NodeInfo nodeInfo;
+        final NodeInfo nodeBackup;
+
+        private boolean applyChanges() {
+            nodeInfo.clear();
+            showTestResult();
+
+            final String portString = etNodePort.getEditText().getText().toString().trim();
+            int port;
+            if (portString.isEmpty()) {
+                port = Node.getDefaultRpcPort();
+            } else {
+                try {
+                    port = Integer.parseInt(portString);
+                } catch (NumberFormatException ex) {
+                    etNodePort.setError(getString(R.string.node_port_numeric));
+                    return false;
+                }
+            }
+            etNodePort.setError(null);
+            if ((port <= 0) || (port > 65535)) {
+                etNodePort.setError(getString(R.string.node_port_range));
+                return false;
+            }
+
+            final String host = etNodeHost.getEditText().getText().toString().trim();
+            if (host.isEmpty()) {
+                etNodeHost.setError(getString(R.string.node_host_empty));
+                return false;
+            }
+            final boolean setHostSuccess = Helper.runWithNetwork(() -> {
+                try {
+                    nodeInfo.setHost(host);
+                    return true;
+                } catch (UnknownHostException ex) {
+                    return false;
+                }
+            });
+            if (!setHostSuccess) {
+                etNodeHost.setError(getString(R.string.node_host_unresolved));
+                return false;
+            }
+            etNodeHost.setError(null);
+            nodeInfo.setRpcPort(port);
+            // setName() may trigger reverse DNS
+            Helper.runWithNetwork(new Helper.Action() {
+                @Override
+                public boolean run() {
+                    nodeInfo.setName(etNodeName.getEditText().getText().toString().trim());
+                    return true;
+                }
+            });
+            nodeInfo.setUsername(etNodeUser.getEditText().getText().toString().trim());
+            nodeInfo.setPassword(etNodePass.getEditText().getText().toString()); // no trim for pw
+            return true;
+        }
+
+        private boolean shutdown = false;
+
+        private void apply() {
+            if (applyChanges()) {
+                closeDialog();
+                if (nodeBackup == null) { // this is a (FAB) new node
+                    nodeInfo.setFavourite(true);
+                    nodeList.add(nodeInfo);
+                }
+                shutdown = true;
+                new AsyncTestNode().execute();
+            }
+        }
+
+        private void closeDialog() {
+            if (editDialog == null) throw new IllegalStateException();
+            Helper.hideKeyboardAlways(getActivity());
+            editDialog.dismiss();
+            editDialog = null;
+            NodeFragment.this.editDialog = null;
+        }
+
+        private void show() {
+            editDialog.show();
+        }
+
+        private void test() {
+            if (applyChanges())
+                new AsyncTestNode().execute();
+        }
+
+        private void showKeyboard() {
+            Helper.showKeyboard(editDialog);
+        }
+
+        AlertDialog editDialog = null;
+
+        TextInputLayout etNodeName;
+        TextInputLayout etNodeHost;
+        TextInputLayout etNodePort;
+        TextInputLayout etNodeUser;
+        TextInputLayout etNodePass;
+        TextView tvResult;
+
+        void showTestResult() {
+            if (nodeInfo.isSuccessful()) {
+                tvResult.setText(getString(R.string.node_result,
+                        FORMATTER.format(nodeInfo.getHeight()), nodeInfo.getMajorVersion(),
+                        nodeInfo.getResponseTime(), nodeInfo.getHostAddress()));
+            } else {
+                tvResult.setText(NodeInfoAdapter.getResponseErrorText(getActivity(), nodeInfo.getResponseCode()));
+            }
+        }
+
+        EditDialog(final NodeInfo nodeInfo) {
+            AlertDialog.Builder alertDialogBuilder = new MaterialAlertDialogBuilder(getActivity());
+            LayoutInflater li = LayoutInflater.from(alertDialogBuilder.getContext());
+            View promptsView = li.inflate(R.layout.prompt_editnode, null);
+            alertDialogBuilder.setView(promptsView);
+
+            etNodeName = promptsView.findViewById(R.id.etNodeName);
+            etNodeHost = promptsView.findViewById(R.id.etNodeHost);
+            etNodePort = promptsView.findViewById(R.id.etNodePort);
+            etNodeUser = promptsView.findViewById(R.id.etNodeUser);
+            etNodePass = promptsView.findViewById(R.id.etNodePass);
+            tvResult = promptsView.findViewById(R.id.tvResult);
+
+            if (nodeInfo != null) {
+                this.nodeInfo = nodeInfo;
+                nodeBackup = new NodeInfo(nodeInfo);
+                etNodeName.getEditText().setText(nodeInfo.getName());
+                etNodeHost.getEditText().setText(nodeInfo.getHost());
+                etNodePort.getEditText().setText(Integer.toString(nodeInfo.getRpcPort()));
+                etNodeUser.getEditText().setText(nodeInfo.getUsername());
+                etNodePass.getEditText().setText(nodeInfo.getPassword());
+                showTestResult();
+            } else {
+                this.nodeInfo = new NodeInfo();
+                nodeBackup = null;
+            }
+
+            // set dialog message
+            alertDialogBuilder
+                    .setCancelable(false)
+                    .setPositiveButton(getString(R.string.label_ok), null)
+                    .setNeutralButton(getString(R.string.label_test), null)
+                    .setNegativeButton(getString(R.string.label_cancel),
+                            (dialog, id) -> {
+                                closeDialog();
+                                nodesAdapter.setNodes(); // to refresh test results
+                            });
+
+            editDialog = alertDialogBuilder.create();
+            // these need to be here, since we don't always close the dialog
+            editDialog.setOnShowListener(new DialogInterface.OnShowListener() {
+                @Override
+                public void onShow(final DialogInterface dialog) {
+                    Button testButton = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_NEUTRAL);
+                    testButton.setOnClickListener(view -> test());
+
+                    Button button = ((AlertDialog) dialog).getButton(AlertDialog.BUTTON_POSITIVE);
+                    button.setOnClickListener(view -> apply());
+                }
+            });
+
+            if (Helper.preventScreenshot()) {
+                editDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+            }
+
+            etNodePass.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+                if (actionId == EditorInfo.IME_ACTION_DONE) {
+                    editDialog.getButton(DialogInterface.BUTTON_NEUTRAL).requestFocus();
+                    test();
+                    return true;
+                }
+                return false;
+            });
+        }
+
+        private class AsyncTestNode extends AsyncTask<Void, Void, Boolean> {
+            @Override
+            protected void onPreExecute() {
+                super.onPreExecute();
+                tvResult.setText(getString(R.string.node_testing, nodeInfo.getHostAddress()));
+            }
+
+            @Override
+            protected Boolean doInBackground(Void... params) {
+                nodeInfo.testRpcService();
+                return true;
+            }
+
+            @Override
+            protected void onPostExecute(Boolean result) {
+                if (editDialog != null) {
+                    showTestResult();
+                }
+                if (shutdown) {
+                    if (nodeBackup == null) {
+                        nodesAdapter.addNode(nodeInfo);
+                    } else {
+                        nodesAdapter.setNodes();
+                    }
+                    nodesAdapter.notifyItemChanged(nodeInfo);
+                }
+            }
+        }
+    }
+
+    void restoreDefaultNodes() {
+        if (WalletManager.getInstance().getNetworkType() == NetworkType.NetworkType_Mainnet) {
+            if (!refresh(AsyncFindNodes.RESTORE_DEFAULTS)) {
+                Toast.makeText(getActivity(), getString(R.string.toast_default_nodes), Toast.LENGTH_SHORT).show();
+            }
+        } else {
+            Toast.makeText(getActivity(), getString(R.string.node_wrong_net), Toast.LENGTH_LONG).show();
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/OnBackPressedListener.java

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+public interface OnBackPressedListener {
+    boolean onBackPressed();
+}

app/src/main/java/com/m2049r/xmrwallet/OnBlockUpdateListener.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2021 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import com.m2049r.xmrwallet.model.Wallet;
+
+public interface OnBlockUpdateListener {
+    void onBlockUpdate(final Wallet wallet);
+}

app/src/main/java/com/m2049r/xmrwallet/OnUriScannedListener.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import com.m2049r.xmrwallet.data.BarcodeData;
+
+public interface OnUriScannedListener {
+    boolean onUriScanned(BarcodeData barcodeData);
+}

app/src/main/java/com/m2049r/xmrwallet/ReceiveFragment.java

@@ -0,0 +1,469 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.drawable.BitmapDrawable;
+import android.net.Uri;
+import android.nfc.NfcManager;
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.Html;
+import android.text.InputType;
+import android.text.Spanned;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.EditorInfo;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.content.FileProvider;
+import androidx.fragment.app.Fragment;
+
+import com.google.android.material.textfield.TextInputLayout;
+import com.google.android.material.transition.MaterialContainerTransform;
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.EncodeHintType;
+import com.google.zxing.WriterException;
+import com.google.zxing.common.BitMatrix;
+import com.google.zxing.qrcode.QRCodeWriter;
+import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
+import com.m2049r.xmrwallet.data.BarcodeData;
+import com.m2049r.xmrwallet.data.Crypto;
+import com.m2049r.xmrwallet.data.Subaddress;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+import com.m2049r.xmrwallet.widget.ExchangeView;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+
+import timber.log.Timber;
+
+public class ReceiveFragment extends Fragment {
+
+    private ProgressBar pbProgress;
+    private TextView tvAddress;
+    private TextInputLayout etNotes;
+    private ExchangeView evAmount;
+    private TextView tvQrCode;
+    private ImageView ivQrCode;
+    private ImageView ivQrCodeFull;
+    private EditText etDummy;
+    private ImageButton bCopyAddress;
+    private MenuItem shareItem;
+
+    private Wallet wallet = null;
+    private boolean isMyWallet = false;
+
+    public interface Listener {
+        void setToolbarButton(int type);
+
+        void setTitle(String title);
+
+        void setSubtitle(String subtitle);
+
+        void showSubaddresses(boolean managerMode);
+
+        Subaddress getSelectedSubaddress();
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        View view = inflater.inflate(R.layout.fragment_receive, container, false);
+
+        pbProgress = view.findViewById(R.id.pbProgress);
+        tvAddress = view.findViewById(R.id.tvAddress);
+        etNotes = view.findViewById(R.id.etNotes);
+        evAmount = view.findViewById(R.id.evAmount);
+        ivQrCode = view.findViewById(R.id.qrCode);
+        tvQrCode = view.findViewById(R.id.tvQrCode);
+        ivQrCodeFull = view.findViewById(R.id.qrCodeFull);
+        etDummy = view.findViewById(R.id.etDummy);
+        bCopyAddress = view.findViewById(R.id.bCopyAddress);
+
+        etDummy.setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+
+        bCopyAddress.setOnClickListener(v -> copyAddress());
+
+        evAmount.setOnNewAmountListener(xmr -> {
+            Timber.d("new amount = %s", xmr);
+            generateQr();
+            if (shareRequested && (xmr != null)) share();
+        });
+
+        evAmount.setOnFailedExchangeListener(() -> {
+            if (isAdded()) {
+                clearQR();
+                Toast.makeText(getActivity(), getString(R.string.message_exchange_failed), Toast.LENGTH_LONG).show();
+            }
+        });
+
+        final EditText notesEdit = etNotes.getEditText();
+        notesEdit.setRawInputType(InputType.TYPE_CLASS_TEXT);
+        notesEdit.setOnEditorActionListener((v, actionId, event) -> {
+            if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                    || (actionId == EditorInfo.IME_ACTION_DONE)) {
+                generateQr();
+                return true;
+            }
+            return false;
+        });
+        notesEdit.addTextChangedListener(new TextWatcher() {
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+                clearQR();
+            }
+
+            @Override
+            public void afterTextChanged(Editable s) {
+            }
+        });
+
+        tvAddress.setOnClickListener(v -> {
+            listenerCallback.showSubaddresses(false);
+        });
+
+        view.findViewById(R.id.cvQrCode).setOnClickListener(v -> {
+            Helper.hideKeyboard(getActivity());
+            etDummy.requestFocus();
+            if (qrValid) {
+                ivQrCodeFull.setImageBitmap(((BitmapDrawable) ivQrCode.getDrawable()).getBitmap());
+                ivQrCodeFull.setVisibility(View.VISIBLE);
+            } else {
+                evAmount.doExchange();
+            }
+        });
+
+        ivQrCodeFull.setOnClickListener(v -> {
+            ivQrCodeFull.setImageBitmap(null);
+            ivQrCodeFull.setVisibility(View.GONE);
+        });
+
+        showProgress();
+        clearQR();
+
+        if (getActivity() instanceof GenerateReviewFragment.ListenerWithWallet) {
+            wallet = ((GenerateReviewFragment.ListenerWithWallet) getActivity()).getWallet();
+            show();
+        } else {
+            throw new IllegalStateException("no wallet info");
+        }
+
+        View tvNfc = view.findViewById(R.id.tvNfc);
+        NfcManager manager = (NfcManager) getContext().getSystemService(Context.NFC_SERVICE);
+        if ((manager != null) && (manager.getDefaultAdapter() != null))
+            tvNfc.setVisibility(View.VISIBLE);
+
+        return view;
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+        final MaterialContainerTransform transform = new MaterialContainerTransform();
+        transform.setDrawingViewId(R.id.fragment_container);
+        transform.setDuration(getResources().getInteger(R.integer.tx_item_transition_duration));
+        transform.setAllContainerColors(ThemeHelper.getThemedColor(getContext(), android.R.attr.colorBackground));
+        setSharedElementEnterTransition(transform);
+    }
+
+    private boolean shareRequested = false;
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, final MenuInflater inflater) {
+        inflater.inflate(R.menu.receive_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+
+        shareItem = menu.findItem(R.id.menu_item_share);
+        shareItem.setOnMenuItemClickListener(item -> {
+            if (shareRequested) return true;
+            shareRequested = true;
+            if (!qrValid) {
+                evAmount.doExchange();
+            } else {
+                share();
+            }
+            return true;
+        });
+    }
+
+    private void share() {
+        shareRequested = false;
+        if (saveQrCode()) {
+            final Intent sendIntent = getSendIntent();
+            if (sendIntent != null)
+                startActivity(Intent.createChooser(sendIntent, null));
+        } else {
+            Toast.makeText(getActivity(), getString(R.string.message_qr_failed), Toast.LENGTH_SHORT).show();
+        }
+    }
+
+    private boolean saveQrCode() {
+        if (!qrValid) throw new IllegalStateException("trying to save null qr code!");
+
+        File cachePath = new File(getActivity().getCacheDir(), "images");
+        if (!cachePath.exists())
+            if (!cachePath.mkdirs()) throw new IllegalStateException("cannot create images folder");
+        File png = new File(cachePath, "QR.png");
+        try {
+            FileOutputStream stream = new FileOutputStream(png);
+            Bitmap qrBitmap = ((BitmapDrawable) ivQrCode.getDrawable()).getBitmap();
+            qrBitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
+            stream.close();
+            return true;
+        } catch (IOException ex) {
+            Timber.e(ex);
+            // make sure we don't share an old qr code
+            if (!png.delete()) throw new IllegalStateException("cannot delete old qr code");
+            // if we manage to delete it, the URI points to nothing and the user gets a toast with the error
+        }
+        return false;
+    }
+
+    private Intent getSendIntent() {
+        File imagePath = new File(requireActivity().getCacheDir(), "images");
+        File png = new File(imagePath, "QR.png");
+        Uri contentUri = FileProvider.getUriForFile(requireActivity(), BuildConfig.APPLICATION_ID + ".fileprovider", png);
+        if (contentUri != null) {
+            Intent shareIntent = new Intent();
+            shareIntent.setAction(Intent.ACTION_SEND);
+            shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION); // temp permission for receiving app to read this file
+            shareIntent.setTypeAndNormalize("image/png");
+            shareIntent.putExtra(Intent.EXTRA_STREAM, contentUri);
+            if (bcData != null)
+                shareIntent.putExtra(Intent.EXTRA_TEXT, bcData.getUriString());
+            return shareIntent;
+        }
+        return null;
+    }
+
+    void copyAddress() {
+        Helper.clipBoardCopy(requireActivity(), getString(R.string.label_copy_address), subaddress.getAddress());
+        Toast.makeText(getActivity(), getString(R.string.message_copy_address), Toast.LENGTH_SHORT).show();
+    }
+
+    private boolean qrValid = false;
+
+    void clearQR() {
+        if (qrValid) {
+            ivQrCode.setImageBitmap(null);
+            qrValid = false;
+            if (isLoaded)
+                tvQrCode.setVisibility(View.VISIBLE);
+        }
+    }
+
+    void setQR(Bitmap qr) {
+        ivQrCode.setImageBitmap(qr);
+        qrValid = true;
+        tvQrCode.setVisibility(View.GONE);
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        listenerCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+        if (wallet != null) {
+            listenerCallback.setTitle(wallet.getName());
+            listenerCallback.setSubtitle(wallet.getAccountLabel());
+            setNewSubaddress();
+        } else {
+            listenerCallback.setSubtitle(getString(R.string.status_wallet_loading));
+            clearQR();
+        }
+    }
+
+    private boolean isLoaded = false;
+
+    private void show() {
+        Timber.d("name=%s", wallet.getName());
+        isLoaded = true;
+        hideProgress();
+    }
+
+    public BarcodeData getBarcodeData() {
+        if (qrValid)
+            return bcData;
+        else
+            return null;
+    }
+
+    private BarcodeData bcData = null;
+
+    private void generateQr() {
+        Timber.d("GENQR");
+        String address = subaddress.getAddress();
+        String notes = etNotes.getEditText().getText().toString();
+        String xmrAmount = evAmount.getAmount();
+        Timber.d("%s/%s/%s", xmrAmount, notes, address);
+        if ((xmrAmount == null) || !Wallet.isAddressValid(address)) {
+            clearQR();
+            Timber.d("CLEARQR");
+            return;
+        }
+        bcData = new BarcodeData(Crypto.XMR, address, notes, xmrAmount);
+        int size = Math.max(ivQrCode.getWidth(), ivQrCode.getHeight());
+        Bitmap qr = generate(bcData.getUriString(), size, size);
+        if (qr != null) {
+            setQR(qr);
+            Timber.d("SETQR");
+            etDummy.requestFocus();
+            Helper.hideKeyboard(getActivity());
+        }
+    }
+
+    public Bitmap generate(String text, int width, int height) {
+        if ((width <= 0) || (height <= 0)) return null;
+        Map<EncodeHintType, Object> hints = new HashMap<>();
+        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
+        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);
+        try {
+            BitMatrix bitMatrix = new QRCodeWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);
+            int[] pixels = new int[width * height];
+            for (int i = 0; i < height; i++) {
+                for (int j = 0; j < width; j++) {
+                    if (bitMatrix.get(j, i)) {
+                        pixels[i * width + j] = 0x00000000;
+                    } else {
+                        pixels[i * height + j] = 0xffffffff;
+                    }
+                }
+            }
+            Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.RGB_565);
+            bitmap = addLogo(bitmap);
+            return bitmap;
+        } catch (WriterException ex) {
+            Timber.e(ex);
+        }
+        return null;
+    }
+
+    private Bitmap addLogo(Bitmap qrBitmap) {
+        // addume logo & qrcode are both square
+        Bitmap logo = getMoneroLogo();
+        final int qrSize = qrBitmap.getWidth();
+        final int logoSize = logo.getWidth();
+
+        Bitmap logoBitmap = Bitmap.createBitmap(qrSize, qrSize, Bitmap.Config.ARGB_8888);
+        Canvas canvas = new Canvas(logoBitmap);
+        canvas.drawBitmap(qrBitmap, 0, 0, null);
+        canvas.save();
+        final float sx = 0.2f * qrSize / logoSize;
+        canvas.scale(sx, sx, qrSize / 2f, qrSize / 2f);
+        canvas.drawBitmap(logo, (qrSize - logoSize) / 2f, (qrSize - logoSize) / 2f, null);
+        canvas.restore();
+        return logoBitmap;
+    }
+
+    private Bitmap logo = null;
+
+    private Bitmap getMoneroLogo() {
+        if (logo == null) {
+            logo = Helper.getBitmap(getContext(), R.drawable.ic_monero_logo_b);
+        }
+        return logo;
+    }
+
+    public void showProgress() {
+        pbProgress.setVisibility(View.VISIBLE);
+    }
+
+    public void hideProgress() {
+        pbProgress.setVisibility(View.GONE);
+    }
+
+    Listener listenerCallback = null;
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.listenerCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        Timber.d("onPause()");
+        Helper.hideKeyboard(getActivity());
+        super.onPause();
+    }
+
+    @Override
+    public void onDetach() {
+        Timber.d("onDetach()");
+        if ((wallet != null) && (isMyWallet)) {
+            wallet.close();
+            wallet = null;
+            isMyWallet = false;
+        }
+        super.onDetach();
+    }
+
+    private Subaddress subaddress = null;
+
+    void setNewSubaddress() {
+        final Subaddress newSubaddress = listenerCallback.getSelectedSubaddress();
+        if (!Objects.equals(subaddress, newSubaddress)) {
+            final Runnable resetSize = () -> tvAddress.animate().setDuration(125).scaleX(1).scaleY(1).start();
+            tvAddress.animate().alpha(1).setDuration(125)
+                    .scaleX(1.2f).scaleY(1.2f)
+                    .withEndAction(resetSize).start();
+        }
+        subaddress = newSubaddress;
+        final Context context = getContext();
+        Spanned label = Html.fromHtml(context.getString(R.string.receive_subaddress,
+                Integer.toHexString(ThemeHelper.getThemedColor(context, R.attr.positiveColor) & 0xFFFFFF),
+                Integer.toHexString(ThemeHelper.getThemedColor(context, android.R.attr.colorBackground) & 0xFFFFFF),
+                subaddress.getDisplayLabel(), subaddress.getAddress()));
+        tvAddress.setText(label);
+        generateQr();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/ScannerFragment.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright (c) 2017 dm77, m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.os.Handler;
+import androidx.fragment.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Toast;
+
+import com.google.zxing.BarcodeFormat;
+import com.google.zxing.Result;
+
+import me.dm7.barcodescanner.zxing.ZXingScannerView;
+import timber.log.Timber;
+
+public class ScannerFragment extends Fragment implements ZXingScannerView.ResultHandler {
+
+    private OnScannedListener onScannedListener;
+
+    public interface OnScannedListener {
+        boolean onScanned(String qrCode);
+    }
+
+    private ZXingScannerView mScannerView;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        Timber.d("onCreateView");
+        mScannerView = new ZXingScannerView(getActivity());
+        return mScannerView;
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume");
+        mScannerView.setResultHandler(this);
+        mScannerView.startCamera();
+    }
+
+    @Override
+    public void handleResult(Result rawResult) {
+        if ((rawResult.getBarcodeFormat() == BarcodeFormat.QR_CODE)) {
+            if (onScannedListener.onScanned(rawResult.getText())) {
+                return;
+            } else {
+                Toast.makeText(getActivity(), getString(R.string.send_qr_address_invalid), Toast.LENGTH_SHORT).show();
+            }
+        } else {
+            Toast.makeText(getActivity(), getString(R.string.send_qr_invalid), Toast.LENGTH_SHORT).show();
+        }
+
+        // Note from dm77:
+        // * Wait 2 seconds to resume the preview.
+        // * On older devices continuously stopping and resuming camera preview can result in freezing the app.
+        // * I don't know why this is the case but I don't have the time to figure out.
+        Handler handler = new Handler();
+        handler.postDelayed(() -> mScannerView.resumeCameraPreview(ScannerFragment.this), 2000);
+    }
+
+    @Override
+    public void onPause() {
+        Timber.d("onPause");
+        mScannerView.stopCamera();
+        super.onPause();
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        if (context instanceof OnScannedListener) {
+            this.onScannedListener = (OnScannedListener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/SecureActivity.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.content.res.Configuration;
+import android.os.Build;
+import android.os.Bundle;
+
+import androidx.annotation.Nullable;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.LocaleHelper;
+
+import java.util.Locale;
+
+import static android.view.WindowManager.LayoutParams;
+
+public abstract class SecureActivity extends AppCompatActivity {
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        if (Helper.preventScreenshot()) {
+            getWindow().setFlags(LayoutParams.FLAG_SECURE, LayoutParams.FLAG_SECURE);
+        }
+    }
+
+    @Override
+    protected void attachBaseContext(Context newBase) {
+        super.attachBaseContext(newBase);
+        applyOverrideConfiguration(new Configuration());
+    }
+
+    @Override
+    public void applyOverrideConfiguration(Configuration newConfig) {
+        super.applyOverrideConfiguration(updateConfigurationIfSupported(newConfig));
+    }
+
+    private Configuration updateConfigurationIfSupported(Configuration config) {
+        // Configuration.getLocales is added after 24 and Configuration.locale is deprecated in 24
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            if (!config.getLocales().isEmpty()) {
+                return config;
+            }
+        } else {
+            if (config.locale != null) {
+                return config;
+            }
+        }
+
+        Locale locale = LocaleHelper.getPreferredLocale(this);
+        if (locale != null) {
+            config.setLocale(locale);
+        }
+        return config;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/SettingsFragment.java

@@ -0,0 +1,125 @@
+package com.m2049r.xmrwallet;
+
+import android.app.Activity;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+
+import androidx.annotation.StyleRes;
+import androidx.preference.ListPreference;
+import androidx.preference.PreferenceFragmentCompat;
+import androidx.preference.PreferenceManager;
+
+import com.m2049r.xmrwallet.dialog.AboutFragment;
+import com.m2049r.xmrwallet.dialog.CreditsFragment;
+import com.m2049r.xmrwallet.dialog.PrivacyFragment;
+import com.m2049r.xmrwallet.util.DayNightMode;
+import com.m2049r.xmrwallet.util.LocaleHelper;
+import com.m2049r.xmrwallet.util.NightmodeHelper;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Locale;
+
+import timber.log.Timber;
+
+public class SettingsFragment extends PreferenceFragmentCompat
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+    @Override
+    public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
+        setPreferencesFromResource(R.xml.root_preferences, rootKey);
+
+        findPreference(getString(R.string.about_info)).setOnPreferenceClickListener(preference -> {
+            AboutFragment.display(getParentFragmentManager());
+            return true;
+        });
+        findPreference(getString(R.string.privacy_info)).setOnPreferenceClickListener(preference -> {
+            PrivacyFragment.display(getParentFragmentManager());
+            return true;
+        });
+        findPreference(getString(R.string.credits_info)).setOnPreferenceClickListener(preference -> {
+            CreditsFragment.display(getParentFragmentManager());
+            return true;
+        });
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        if (key.equals(getString(R.string.preferred_locale))) {
+            activity.recreate();
+        } else if (key.equals(getString(R.string.preferred_nightmode))) {
+            NightmodeHelper.setNightMode(DayNightMode.valueOf(sharedPreferences.getString(key, "AUTO")));
+        } else if (key.equals(getString(R.string.preferred_theme))) {
+            ThemeHelper.setTheme((Activity) activity, sharedPreferences.getString(key, "Classic"));
+            activity.recreate();
+        }
+    }
+
+    private SettingsFragment.Listener activity;
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        if (context instanceof SettingsFragment.Listener) {
+            activity = (SettingsFragment.Listener) context;
+        } else {
+            throw new ClassCastException(context + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activity.setSubtitle(getString(R.string.menu_settings));
+        activity.setToolbarButton(Toolbar.BUTTON_BACK);
+        populateLanguages();
+        PreferenceManager.getDefaultSharedPreferences(requireContext())
+                .registerOnSharedPreferenceChangeListener(this);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        PreferenceManager.getDefaultSharedPreferences(requireContext())
+                .unregisterOnSharedPreferenceChangeListener(this);
+    }
+
+    public interface Listener {
+        void setToolbarButton(int type);
+
+        void setSubtitle(String title);
+
+        void recreate();
+
+        void setTheme(@StyleRes final int resId);
+    }
+
+    public void populateLanguages() {
+        ListPreference language = findPreference(getString(R.string.preferred_locale));
+        assert language != null;
+
+        final ArrayList<Locale> availableLocales = LocaleHelper.getAvailableLocales(requireContext());
+        Collections.sort(availableLocales, (locale1, locale2) -> {
+            String localeString1 = LocaleHelper.getDisplayName(locale1, true);
+            String localeString2 = LocaleHelper.getDisplayName(locale2, true);
+            return localeString1.compareTo(localeString2);
+        });
+
+        String[] localeDisplayNames = new String[1 + availableLocales.size()];
+        localeDisplayNames[0] = getString(R.string.language_system_default);
+        for (int i = 1; i < localeDisplayNames.length; i++) {
+            localeDisplayNames[i] = LocaleHelper.getDisplayName(availableLocales.get(i - 1), true);
+        }
+        language.setEntries(localeDisplayNames);
+
+        String[] languageTags = new String[1 + availableLocales.size()];
+        languageTags[0] = "";
+        for (int i = 1; i < languageTags.length; i++) {
+            languageTags[i] = availableLocales.get(i - 1).toLanguageTag();
+        }
+        language.setEntryValues(languageTags);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/SubaddressFragment.java

@@ -0,0 +1,241 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.os.AsyncTask;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.m2049r.xmrwallet.data.Subaddress;
+import com.m2049r.xmrwallet.layout.SubaddressInfoAdapter;
+import com.m2049r.xmrwallet.ledger.LedgerProgressDialog;
+import com.m2049r.xmrwallet.model.TransactionInfo;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.MoneroThreadPoolExecutor;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import lombok.RequiredArgsConstructor;
+import timber.log.Timber;
+
+public class SubaddressFragment extends Fragment implements SubaddressInfoAdapter.OnInteractionListener,
+        View.OnClickListener, OnBlockUpdateListener {
+    static public final String KEY_MODE = "mode";
+    static public final String MODE_MANAGER = "manager";
+
+    private SubaddressInfoAdapter adapter;
+
+    private Listener activityCallback;
+
+    private Wallet wallet;
+
+    // Container Activity must implement this interface
+    public interface Listener {
+        void onSubaddressSelected(Subaddress subaddress);
+
+        void setSubtitle(String title);
+
+        void setToolbarButton(int type);
+
+        void showSubaddress(View view, final int subaddressIndex);
+
+        void saveWallet();
+    }
+
+    public interface ProgressListener {
+        void showProgressDialog(int msgId);
+
+        void showLedgerProgressDialog(int mode);
+
+        void dismissProgressDialog();
+    }
+
+    private ProgressListener progressCallback = null;
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof ProgressListener) {
+            progressCallback = (ProgressListener) context;
+        }
+        if (context instanceof Listener) {
+            activityCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        Timber.d("onPause()");
+        super.onPause();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        activityCallback.setSubtitle(getString(R.string.subbaddress_title));
+        activityCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        Timber.d("onCreateView");
+
+        final Bundle b = getArguments();
+        managerMode = ((b != null) && (MODE_MANAGER.equals(b.getString(KEY_MODE))));
+
+        View view = inflater.inflate(R.layout.fragment_subaddress, container, false);
+        view.findViewById(R.id.fab).setOnClickListener(this);
+
+        if (managerMode) {
+            view.findViewById(R.id.tvInstruction).setVisibility(View.GONE);
+            view.findViewById(R.id.tvHint).setVisibility(View.GONE);
+        }
+
+        final RecyclerView list = view.findViewById(R.id.list);
+        adapter = new SubaddressInfoAdapter(getActivity(), this);
+        list.setAdapter(adapter);
+        adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
+            @Override
+            public void onItemRangeInserted(int positionStart, int itemCount) {
+                list.scrollToPosition(positionStart);
+            }
+        });
+
+        Helper.hideKeyboard(getActivity());
+
+        wallet = WalletManager.getInstance().getWallet();
+
+        loadList();
+
+        return view;
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+    }
+
+    public void loadList() {
+        Timber.d("loadList()");
+        final int numSubaddresses = wallet.getNumSubaddresses();
+        final List<Subaddress> list = new ArrayList<>();
+        for (int i = 0; i < numSubaddresses; i++) {
+            list.add(wallet.getSubaddressObject(i));
+        }
+        adapter.setInfos(list);
+    }
+
+    @Override
+    public void onBlockUpdate(Wallet wallet) {
+        loadList();
+    }
+
+    @Override
+    public void onClick(View v) {
+        int id = v.getId();
+        if (id == R.id.fab) {
+            getNewSubaddress();
+        }
+    }
+
+    private int lastUsedSubaddress() {
+        int lastUsedSubaddress = 0;
+        for (TransactionInfo info : wallet.getHistory().getAll()) {
+            if (info.addressIndex > lastUsedSubaddress)
+                lastUsedSubaddress = info.addressIndex;
+        }
+        return lastUsedSubaddress;
+    }
+
+    private void getNewSubaddress() {
+        final int maxSubaddresses = lastUsedSubaddress() + wallet.getDeviceType().getSubaddressLookahead();
+        if (wallet.getNumSubaddresses() < maxSubaddresses)
+            new AsyncSubaddress().executeOnExecutor(MoneroThreadPoolExecutor.MONERO_THREAD_POOL_EXECUTOR);
+        else
+            Toast.makeText(getActivity(), getString(R.string.max_subaddress_warning), Toast.LENGTH_LONG).show();
+    }
+
+    @SuppressLint("StaticFieldLeak")
+    @RequiredArgsConstructor
+    private class AsyncSubaddress extends AsyncTask<Void, Void, Boolean> {
+        boolean dialogOpened = false;
+
+        @Override
+        protected void onPreExecute() {
+            super.onPreExecute();
+            if ((wallet.getDeviceType() == Wallet.Device.Device_Ledger) && (progressCallback != null)) {
+                progressCallback.showLedgerProgressDialog(LedgerProgressDialog.TYPE_SUBADDRESS);
+                dialogOpened = true;
+            }
+        }
+
+        @Override
+        protected Boolean doInBackground(Void... params) {
+            if (params.length != 0) return false;
+            wallet.getNewSubaddress();
+            if (activityCallback != null) {
+                activityCallback.saveWallet();
+            }
+            return true;
+        }
+
+        @Override
+        protected void onPostExecute(Boolean result) {
+            super.onPostExecute(result);
+            if (dialogOpened)
+                progressCallback.dismissProgressDialog();
+            if (!isAdded()) // never mind then
+                return;
+            loadList();
+        }
+    }
+
+    boolean managerMode = false;
+
+    // Callbacks from SubaddressInfoAdapter
+    @Override
+    public void onInteraction(final View view, final Subaddress subaddress) {
+        if (managerMode)
+            activityCallback.showSubaddress(view, subaddress.getAddressIndex());
+        else
+            activityCallback.onSubaddressSelected(subaddress); // also closes the fragment with onBackpressed()
+    }
+
+    @Override
+    public boolean onLongInteraction(View view, Subaddress subaddress) {
+        activityCallback.showSubaddress(view, subaddress.getAddressIndex());
+        return false;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/SubaddressInfoFragment.java

@@ -0,0 +1,173 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.EditorInfo;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+import androidx.transition.Transition;
+import androidx.transition.TransitionInflater;
+
+import com.google.android.material.textfield.TextInputLayout;
+import com.m2049r.xmrwallet.data.Subaddress;
+import com.m2049r.xmrwallet.layout.TransactionInfoAdapter;
+import com.m2049r.xmrwallet.model.TransactionInfo;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import timber.log.Timber;
+
+public class SubaddressInfoFragment extends Fragment
+        implements TransactionInfoAdapter.OnInteractionListener, OnBlockUpdateListener {
+    private TransactionInfoAdapter adapter;
+
+    private Subaddress subaddress;
+
+    private TextInputLayout etName;
+    private TextView tvAddress;
+    private TextView tvTxLabel;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_subaddressinfo, container, false);
+
+        etName = view.findViewById(R.id.etName);
+        tvAddress = view.findViewById(R.id.tvAddress);
+        tvTxLabel = view.findViewById(R.id.tvTxLabel);
+
+        final RecyclerView list = view.findViewById(R.id.list);
+        adapter = new TransactionInfoAdapter(getActivity(), this);
+        list.setAdapter(adapter);
+
+        final Wallet wallet = activityCallback.getWallet();
+
+        Bundle b = getArguments();
+        final int subaddressIndex = b.getInt("subaddressIndex");
+        subaddress = wallet.getSubaddressObject(subaddressIndex);
+
+        etName.getEditText().setText(subaddress.getDisplayLabel());
+        tvAddress.setText(getContext().getString(R.string.subbaddress_info_subtitle,
+                subaddress.getAddressIndex(), subaddress.getSquashedAddress()));
+
+        etName.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                wallet.setSubaddressLabel(subaddressIndex, etName.getEditText().getText().toString());
+            }
+        });
+        etName.getEditText().setOnEditorActionListener((v, actionId, event) -> {
+            if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                    || (actionId == EditorInfo.IME_ACTION_DONE)) {
+                Helper.hideKeyboard(getActivity());
+                wallet.setSubaddressLabel(subaddressIndex, etName.getEditText().getText().toString());
+                onRefreshed(wallet);
+                return true;
+            }
+            return false;
+        });
+
+        onRefreshed(wallet);
+
+        return view;
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        Transition transform = TransitionInflater.from(requireContext())
+                .inflateTransition(R.transition.details);
+        setSharedElementEnterTransition(transform);
+    }
+
+    public void onRefreshed(final Wallet wallet) {
+        Timber.d("onRefreshed");
+        List<TransactionInfo> list = new ArrayList<>();
+        for (TransactionInfo info : wallet.getHistory().getAll()) {
+            if (info.addressIndex == subaddress.getAddressIndex())
+                list.add(info);
+        }
+        adapter.setInfos(list);
+        if (list.isEmpty())
+            tvTxLabel.setText(R.string.subaddress_notx_label);
+        else
+            tvTxLabel.setText(R.string.subaddress_tx_label);
+    }
+
+    @Override
+    public void onBlockUpdate(Wallet wallet) {
+        onRefreshed(wallet);
+    }
+
+    // Callbacks from TransactionInfoAdapter
+    @Override
+    public void onInteraction(final View view, final TransactionInfo infoItem) {
+        activityCallback.onTxDetailsRequest(view, infoItem);
+    }
+
+    Listener activityCallback;
+
+    // Container Activity must implement this interface
+    public interface Listener {
+        void onTxDetailsRequest(View view, TransactionInfo info);
+
+        Wallet getWallet();
+
+        void setToolbarButton(int type);
+
+        void setTitle(String title, String subtitle);
+
+        void setSubtitle(String subtitle);
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.activityCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setSubtitle(getString(R.string.subbaddress_title));
+        activityCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/TxFragment.java

@@ -0,0 +1,406 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.Paint;
+import android.net.Uri;
+import android.os.Bundle;
+import android.text.Html;
+import android.text.InputType;
+import android.text.Spanned;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.transition.Transition;
+import androidx.transition.TransitionInflater;
+
+import com.m2049r.xmrwallet.data.Subaddress;
+import com.m2049r.xmrwallet.data.UserNotes;
+import com.m2049r.xmrwallet.model.TransactionInfo;
+import com.m2049r.xmrwallet.model.Transfer;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.TimeZone;
+
+import timber.log.Timber;
+
+public class TxFragment extends Fragment {
+
+    static public final String ARG_INFO = "info";
+
+    private final SimpleDateFormat TS_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss Z");
+
+    public TxFragment() {
+        super();
+        Calendar cal = Calendar.getInstance();
+        TimeZone tz = cal.getTimeZone(); //get the local time zone.
+        TS_FORMATTER.setTimeZone(tz);
+    }
+
+    private TextView tvAccount;
+    private TextView tvAddress;
+    private TextView tvTxTimestamp;
+    private TextView tvTxId;
+    private TextView tvTxKey;
+    private TextView tvDestination;
+    private TextView tvTxPaymentId;
+    private TextView tvTxBlockheight;
+    private TextView tvTxAmount;
+    private TextView tvTxFee;
+    private TextView tvTxTransfers;
+    private TextView etTxNotes;
+
+    // XMRTO stuff
+    private View cvXmrTo;
+    private TextView tvTxXmrToKey;
+    private TextView tvDestinationBtc;
+    private TextView tvTxAmountBtc;
+    private TextView tvXmrToSupport;
+    private TextView tvXmrToKeyLabel;
+    private ImageView tvXmrToLogo;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_tx_info, container, false);
+
+        cvXmrTo = view.findViewById(R.id.cvXmrTo);
+        tvTxXmrToKey = view.findViewById(R.id.tvTxXmrToKey);
+        tvDestinationBtc = view.findViewById(R.id.tvDestinationBtc);
+        tvTxAmountBtc = view.findViewById(R.id.tvTxAmountBtc);
+        tvXmrToSupport = view.findViewById(R.id.tvXmrToSupport);
+        tvXmrToKeyLabel = view.findViewById(R.id.tvXmrToKeyLabel);
+        tvXmrToLogo = view.findViewById(R.id.tvXmrToLogo);
+
+        tvAccount = view.findViewById(R.id.tvAccount);
+        tvAddress = view.findViewById(R.id.tvAddress);
+        tvTxTimestamp = view.findViewById(R.id.tvTxTimestamp);
+        tvTxId = view.findViewById(R.id.tvTxId);
+        tvTxKey = view.findViewById(R.id.tvTxKey);
+        tvDestination = view.findViewById(R.id.tvDestination);
+        tvTxPaymentId = view.findViewById(R.id.tvTxPaymentId);
+        tvTxBlockheight = view.findViewById(R.id.tvTxBlockheight);
+        tvTxAmount = view.findViewById(R.id.tvTxAmount);
+        tvTxFee = view.findViewById(R.id.tvTxFee);
+        tvTxTransfers = view.findViewById(R.id.tvTxTransfers);
+        etTxNotes = view.findViewById(R.id.etTxNotes);
+
+        etTxNotes.setRawInputType(InputType.TYPE_CLASS_TEXT);
+
+        tvTxXmrToKey.setOnClickListener(v -> {
+            Helper.clipBoardCopy(getActivity(), getString(R.string.label_copy_xmrtokey), tvTxXmrToKey.getText().toString());
+            Toast.makeText(getActivity(), getString(R.string.message_copy_xmrtokey), Toast.LENGTH_SHORT).show();
+        });
+
+        info = getArguments().getParcelable(ARG_INFO);
+        show();
+        return view;
+    }
+
+    void shareTxInfo() {
+        if (this.info == null) return;
+        StringBuffer sb = new StringBuffer();
+
+        sb.append(getString(R.string.tx_timestamp)).append(":\n");
+        sb.append(TS_FORMATTER.format(new Date(info.timestamp * 1000))).append("\n\n");
+
+        sb.append(getString(R.string.tx_amount)).append(":\n");
+        sb.append((info.direction == TransactionInfo.Direction.Direction_In ? "+" : "-"));
+        sb.append(Wallet.getDisplayAmount(info.amount)).append("\n");
+        sb.append(getString(R.string.tx_fee)).append(":\n");
+        sb.append(Wallet.getDisplayAmount(info.fee)).append("\n\n");
+
+        sb.append(getString(R.string.tx_notes)).append(":\n");
+        String oneLineNotes = info.notes.replace("\n", " ; ");
+        sb.append(oneLineNotes.isEmpty() ? "-" : oneLineNotes).append("\n\n");
+
+        sb.append(getString(R.string.tx_destination)).append(":\n");
+        sb.append(tvDestination.getText()).append("\n\n");
+
+        sb.append(getString(R.string.tx_paymentId)).append(":\n");
+        sb.append(info.paymentId).append("\n\n");
+
+        sb.append(getString(R.string.tx_id)).append(":\n");
+        sb.append(info.hash).append("\n");
+        sb.append(getString(R.string.tx_key)).append(":\n");
+        sb.append(info.txKey.isEmpty() ? "-" : info.txKey).append("\n\n");
+
+        sb.append(getString(R.string.tx_blockheight)).append(":\n");
+        if (info.isFailed) {
+            sb.append(getString(R.string.tx_failed)).append("\n");
+        } else if (info.isPending) {
+            sb.append(getString(R.string.tx_pending)).append("\n");
+        } else {
+            sb.append(info.blockheight).append("\n");
+        }
+        sb.append("\n");
+
+        sb.append(getString(R.string.tx_transfers)).append(":\n");
+        if (info.transfers != null) {
+            boolean comma = false;
+            for (Transfer transfer : info.transfers) {
+                if (comma) {
+                    sb.append(", ");
+                } else {
+                    comma = true;
+                }
+                sb.append(transfer.address).append(": ");
+                sb.append(Wallet.getDisplayAmount(transfer.amount));
+            }
+        } else {
+            sb.append("-");
+        }
+        sb.append("\n\n");
+
+        Intent sendIntent = new Intent();
+        sendIntent.setAction(Intent.ACTION_SEND);
+        sendIntent.putExtra(Intent.EXTRA_TEXT, sb.toString());
+        sendIntent.setType("text/plain");
+        startActivity(Intent.createChooser(sendIntent, null));
+    }
+
+    TransactionInfo info = null;
+    UserNotes userNotes = null;
+
+    void loadNotes() {
+        if ((userNotes == null) || (info.notes == null)) {
+            info.notes = activityCallback.getTxNotes(info.hash);
+        }
+        userNotes = new UserNotes(info.notes);
+        etTxNotes.setText(userNotes.note);
+    }
+
+    private void setTxColour(int clr) {
+        tvTxAmount.setTextColor(clr);
+        tvTxFee.setTextColor(clr);
+    }
+
+    private void showSubaddressLabel() {
+        final Subaddress subaddress = activityCallback.getWalletSubaddress(info.accountIndex, info.addressIndex);
+        final Context ctx = getContext();
+        Spanned label = Html.fromHtml(ctx.getString(R.string.tx_account_formatted,
+                info.accountIndex, info.addressIndex,
+                Integer.toHexString(ThemeHelper.getThemedColor(ctx, R.attr.positiveColor) & 0xFFFFFF),
+                Integer.toHexString(ThemeHelper.getThemedColor(ctx, android.R.attr.colorBackground) & 0xFFFFFF),
+                subaddress.getDisplayLabel()));
+        tvAccount.setText(label);
+        tvAccount.setOnClickListener(v -> activityCallback.showSubaddress(v, info.addressIndex));
+    }
+
+    private void show() {
+        if (info.txKey == null) {
+            info.txKey = activityCallback.getTxKey(info.hash);
+        }
+        if (info.address == null) {
+            info.address = activityCallback.getTxAddress(info.accountIndex, info.addressIndex);
+        }
+        loadNotes();
+
+        showSubaddressLabel();
+        tvAddress.setText(info.address);
+
+        tvTxTimestamp.setText(TS_FORMATTER.format(new Date(info.timestamp * 1000)));
+        tvTxId.setText(info.hash);
+        tvTxKey.setText(info.txKey.isEmpty() ? "-" : info.txKey);
+        tvTxPaymentId.setText(info.paymentId);
+        if (info.isFailed) {
+            tvTxBlockheight.setText(getString(R.string.tx_failed));
+        } else if (info.isPending) {
+            tvTxBlockheight.setText(getString(R.string.tx_pending));
+        } else {
+            tvTxBlockheight.setText("" + info.blockheight);
+        }
+        String sign = (info.direction == TransactionInfo.Direction.Direction_In ? "+" : "-");
+
+        long realAmount = info.amount;
+        tvTxAmount.setText(sign + Wallet.getDisplayAmount(realAmount));
+
+        if ((info.fee > 0)) {
+            String fee = Wallet.getDisplayAmount(info.fee);
+            tvTxFee.setText(getString(R.string.tx_list_fee, fee));
+        } else {
+            tvTxFee.setText(null);
+            tvTxFee.setVisibility(View.GONE);
+        }
+
+        if (info.isFailed) {
+            tvTxAmount.setText(getString(R.string.tx_list_amount_failed, Wallet.getDisplayAmount(info.amount)));
+            tvTxFee.setText(getString(R.string.tx_list_failed_text));
+            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.neutralColor));
+        } else if (info.isPending) {
+            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.neutralColor));
+        } else if (info.direction == TransactionInfo.Direction.Direction_In) {
+            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.positiveColor));
+        } else {
+            setTxColour(ThemeHelper.getThemedColor(getContext(), R.attr.negativeColor));
+        }
+        Set<String> destinations = new HashSet<>();
+        StringBuilder sb = new StringBuilder();
+        StringBuilder dstSb = new StringBuilder();
+        if (info.transfers != null) {
+            boolean newline = false;
+            for (Transfer transfer : info.transfers) {
+                destinations.add(transfer.address);
+                if (newline) {
+                    sb.append("\n");
+                } else {
+                    newline = true;
+                }
+                sb.append("[").append(transfer.address.substring(0, 6)).append("] ");
+                sb.append(Wallet.getDisplayAmount(transfer.amount));
+            }
+            newline = false;
+            for (String dst : destinations) {
+                if (newline) {
+                    dstSb.append("\n");
+                } else {
+                    newline = true;
+                }
+                dstSb.append(dst);
+            }
+        } else {
+            sb.append("-");
+            dstSb.append(info.direction == TransactionInfo.Direction.Direction_In ?
+                    activityCallback.getWalletSubaddress(info.accountIndex, info.addressIndex).getAddress() :
+                    "-");
+        }
+        tvTxTransfers.setText(sb.toString());
+        tvDestination.setText(dstSb.toString());
+        showBtcInfo();
+    }
+
+    @SuppressLint("SetTextI18n")
+    void showBtcInfo() {
+        if (userNotes.xmrtoKey != null) {
+            cvXmrTo.setVisibility(View.VISIBLE);
+            String key = userNotes.xmrtoKey;
+            if ("xmrto".equals(userNotes.xmrtoTag)) { // legacy xmr.to service :(
+                key = "xmrto-" + key;
+            }
+            tvTxXmrToKey.setText(key);
+            tvDestinationBtc.setText(userNotes.xmrtoDestination);
+            tvTxAmountBtc.setText(userNotes.xmrtoAmount + " " + userNotes.xmrtoCurrency);
+            switch (userNotes.xmrtoTag) {
+                case "xmrto":
+                    tvXmrToSupport.setVisibility(View.GONE);
+                    tvXmrToKeyLabel.setVisibility(View.INVISIBLE);
+                    tvXmrToLogo.setImageResource(R.drawable.ic_xmrto_logo);
+                    break;
+                case "side": // defaults in layout - just add underline
+                    tvXmrToSupport.setPaintFlags(tvXmrToSupport.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
+                    tvXmrToSupport.setOnClickListener(v -> {
+                        Uri uri = Uri.parse("https://sideshift.ai/orders/" + userNotes.xmrtoKey);
+                        Intent intent = new Intent(Intent.ACTION_VIEW, uri);
+                        startActivity(intent);
+                    });
+                    break;
+                default:
+                    tvXmrToSupport.setVisibility(View.GONE);
+                    tvXmrToKeyLabel.setVisibility(View.INVISIBLE);
+                    tvXmrToLogo.setVisibility(View.GONE);
+            }
+        } else {
+            cvXmrTo.setVisibility(View.GONE);
+        }
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+        Transition transform = TransitionInflater.from(requireContext())
+                .inflateTransition(R.transition.details);
+        setSharedElementEnterTransition(transform);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.tx_info_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    Listener activityCallback;
+
+    public interface Listener {
+        Subaddress getWalletSubaddress(int accountIndex, int subaddressIndex);
+
+        String getTxKey(String hash);
+
+        String getTxNotes(String hash);
+
+        boolean setTxNotes(String txId, String txNotes);
+
+        String getTxAddress(int major, int minor);
+
+        void setToolbarButton(int type);
+
+        void setSubtitle(String subtitle);
+
+        void showSubaddress(View view, final int subaddressIndex);
+
+    }
+
+    @Override
+    public void onAttach(Context context) {
+        super.onAttach(context);
+        if (context instanceof TxFragment.Listener) {
+            this.activityCallback = (TxFragment.Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (!etTxNotes.getText().toString().equals(userNotes.note)) { // notes have changed
+            // save them
+            userNotes.setNote(etTxNotes.getText().toString());
+            info.notes = userNotes.txNotes;
+            activityCallback.setTxNotes(info.hash, info.notes);
+        }
+        Helper.hideKeyboard(getActivity());
+        super.onPause();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setSubtitle(getString(R.string.tx_title));
+        activityCallback.setToolbarButton(Toolbar.BUTTON_BACK);
+        showSubaddressLabel();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/WalletFragment.java

@@ -0,0 +1,559 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.ArrayAdapter;
+import android.widget.Button;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+import android.widget.LinearLayout;
+import android.widget.ProgressBar;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.core.content.ContextCompat;
+import androidx.fragment.app.Fragment;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.github.brnunes.swipeablerecyclerview.SwipeableRecyclerViewTouchListener;
+import com.m2049r.xmrwallet.layout.TransactionInfoAdapter;
+import com.m2049r.xmrwallet.model.TransactionInfo;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeApi;
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeCallback;
+import com.m2049r.xmrwallet.service.exchange.api.ExchangeRate;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.text.NumberFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import timber.log.Timber;
+
+public class WalletFragment extends Fragment
+        implements TransactionInfoAdapter.OnInteractionListener {
+    private TransactionInfoAdapter adapter;
+    private final NumberFormat formatter = NumberFormat.getInstance();
+
+    private TextView tvStreetView;
+    private LinearLayout llBalance;
+    private FrameLayout flExchange;
+    private TextView tvBalance;
+    private TextView tvUnconfirmedAmount;
+    private TextView tvProgress;
+    private ImageView ivSynced;
+    private ProgressBar pbProgress;
+    private Button bReceive;
+    private Button bSend;
+    private ImageView ivStreetGunther;
+    private Drawable streetGunther = null;
+    RecyclerView txlist;
+
+    private Spinner sCurrency;
+
+    private final List<String> dismissedTransactions = new ArrayList<>();
+
+    public void resetDismissedTransactions() {
+        dismissedTransactions.clear();
+    }
+
+    @Override
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, @NonNull MenuInflater inflater) {
+        if (activityCallback.hasWallet())
+            inflater.inflate(R.menu.wallet_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_wallet, container, false);
+
+        ivStreetGunther = view.findViewById(R.id.ivStreetGunther);
+        tvStreetView = view.findViewById(R.id.tvStreetView);
+        llBalance = view.findViewById(R.id.llBalance);
+        flExchange = view.findViewById(R.id.flExchange);
+        ((ProgressBar) view.findViewById(R.id.pbExchange)).getIndeterminateDrawable().
+                setColorFilter(
+                        ThemeHelper.getThemedColor(getContext(), R.attr.colorPrimaryVariant),
+                        android.graphics.PorterDuff.Mode.MULTIPLY);
+
+        tvProgress = view.findViewById(R.id.tvProgress);
+        pbProgress = view.findViewById(R.id.pbProgress);
+        tvBalance = view.findViewById(R.id.tvBalance);
+        showBalance(Helper.getDisplayAmount(0));
+        tvUnconfirmedAmount = view.findViewById(R.id.tvUnconfirmedAmount);
+        showUnconfirmed(0);
+        ivSynced = view.findViewById(R.id.ivSynced);
+
+        sCurrency = view.findViewById(R.id.sCurrency);
+        List<String> currencies = new ArrayList<>();
+        currencies.add(Helper.BASE_CRYPTO);
+        if (Helper.SHOW_EXCHANGERATES)
+            currencies.addAll(Arrays.asList(getResources().getStringArray(R.array.currency)));
+        ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<>(requireContext(), R.layout.item_spinner_balance, currencies);
+        spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+        sCurrency.setAdapter(spinnerAdapter);
+
+        bSend = view.findViewById(R.id.bSend);
+        bReceive = view.findViewById(R.id.bReceive);
+
+        txlist = view.findViewById(R.id.list);
+        adapter = new TransactionInfoAdapter(getActivity(), this);
+        txlist.setAdapter(adapter);
+        adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
+            @Override
+            public void onItemRangeInserted(int positionStart, int itemCount) {
+                if ((positionStart == 0) && (txlist.computeVerticalScrollOffset() == 0))
+                    txlist.scrollToPosition(positionStart);
+            }
+        });
+
+        txlist.addOnItemTouchListener(
+                new SwipeableRecyclerViewTouchListener(txlist,
+                        new SwipeableRecyclerViewTouchListener.SwipeListener() {
+                            @Override
+                            public boolean canSwipeLeft(int position) {
+                                return activityCallback.isStreetMode();
+                            }
+
+                            @Override
+                            public boolean canSwipeRight(int position) {
+                                return activityCallback.isStreetMode();
+                            }
+
+                            @Override
+                            public void onDismissedBySwipeLeft(RecyclerView recyclerView, int[] reverseSortedPositions) {
+                                for (int position : reverseSortedPositions) {
+                                    dismissedTransactions.add(adapter.getItem(position).hash);
+                                    adapter.removeItem(position);
+                                }
+                            }
+
+                            @Override
+                            public void onDismissedBySwipeRight(RecyclerView recyclerView, int[] reverseSortedPositions) {
+                                for (int position : reverseSortedPositions) {
+                                    dismissedTransactions.add(adapter.getItem(position).hash);
+                                    adapter.removeItem(position);
+                                }
+                            }
+                        }));
+
+        bSend.setOnClickListener(v -> activityCallback.onSendRequest(v));
+        bReceive.setOnClickListener(v -> activityCallback.onWalletReceive(v));
+
+        sCurrency.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int position, long id) {
+                refreshBalance();
+            }
+
+            @Override
+            public void onNothingSelected(AdapterView<?> parentView) {
+                // nothing (yet?)
+            }
+        });
+
+        if (activityCallback.isSynced()) {
+            onSynced();
+        }
+
+        activityCallback.forceUpdate();
+
+        return view;
+    }
+
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
+        super.onViewCreated(view, savedInstanceState);
+    }
+
+    void showBalance(String balance) {
+        tvBalance.setText(balance);
+        final boolean streetMode = activityCallback.isStreetMode();
+        if (!streetMode) {
+            llBalance.setVisibility(View.VISIBLE);
+            tvStreetView.setVisibility(View.INVISIBLE);
+        } else {
+            llBalance.setVisibility(View.INVISIBLE);
+            tvStreetView.setVisibility(View.VISIBLE);
+        }
+        setStreetModeBackground(streetMode);
+    }
+
+    void showUnconfirmed(double unconfirmedAmount) {
+        if (activityCallback.isStreetMode() || unconfirmedAmount == 0) {
+            tvUnconfirmedAmount.setText(null);
+            tvUnconfirmedAmount.setVisibility(View.GONE);
+        } else {
+            String unconfirmed = Helper.getFormattedAmount(unconfirmedAmount, true);
+            tvUnconfirmedAmount.setText(getResources().getString(R.string.xmr_unconfirmed_amount, unconfirmed));
+            tvUnconfirmedAmount.setVisibility(View.VISIBLE);
+        }
+    }
+
+    void updateBalance() {
+        if (isExchanging) return; // wait for exchange to finish - it will fire this itself then.
+        // at this point selection is XMR in case of error
+        String displayB;
+        double amountA = Helper.getDecimalAmount(unlockedBalance).doubleValue();
+        if (!Helper.BASE_CRYPTO.equals(balanceCurrency)) { // not XMR
+            double amountB = amountA * balanceRate;
+            displayB = Helper.getFormattedAmount(amountB, false);
+        } else { // XMR
+            displayB = Helper.getFormattedAmount(amountA, true);
+        }
+        showBalance(displayB);
+    }
+
+    String balanceCurrency = Helper.BASE_CRYPTO;
+    double balanceRate = 1.0;
+
+    private final ExchangeApi exchangeApi = ServiceHelper.getExchangeApi();
+
+    void refreshBalance() {
+        double unconfirmedXmr = Helper.getDecimalAmount(balance - unlockedBalance).doubleValue();
+        showUnconfirmed(unconfirmedXmr);
+        if (sCurrency.getSelectedItemPosition() == 0) { // XMR
+            double amountXmr = Helper.getDecimalAmount(unlockedBalance).doubleValue();
+            showBalance(Helper.getFormattedAmount(amountXmr, true));
+        } else { // not XMR
+            String currency = (String) sCurrency.getSelectedItem();
+            Timber.d(currency);
+            if (!currency.equals(balanceCurrency) || (balanceRate <= 0)) {
+                showExchanging();
+                exchangeApi.queryExchangeRate(Helper.BASE_CRYPTO, currency,
+                        new ExchangeCallback() {
+                            @Override
+                            public void onSuccess(final ExchangeRate exchangeRate) {
+                                if (isAdded())
+                                    new Handler(Looper.getMainLooper()).post(() -> exchange(exchangeRate));
+                            }
+
+                            @Override
+                            public void onError(final Exception e) {
+                                Timber.e(e.getLocalizedMessage());
+                                if (isAdded())
+                                    new Handler(Looper.getMainLooper()).post(() -> exchangeFailed());
+                            }
+                        });
+            } else {
+                updateBalance();
+            }
+        }
+    }
+
+    boolean isExchanging = false;
+
+    void showExchanging() {
+        isExchanging = true;
+        tvBalance.setVisibility(View.GONE);
+        flExchange.setVisibility(View.VISIBLE);
+        sCurrency.setEnabled(false);
+    }
+
+    void hideExchanging() {
+        isExchanging = false;
+        tvBalance.setVisibility(View.VISIBLE);
+        flExchange.setVisibility(View.GONE);
+        sCurrency.setEnabled(true);
+    }
+
+    public void exchangeFailed() {
+        sCurrency.setSelection(0, true); // default to XMR
+        double amountXmr = Helper.getDecimalAmount(unlockedBalance).doubleValue();
+        showBalance(Helper.getFormattedAmount(amountXmr, true));
+        hideExchanging();
+    }
+
+    public void exchange(final ExchangeRate exchangeRate) {
+        hideExchanging();
+        if (!Helper.BASE_CRYPTO.equals(exchangeRate.getBaseCurrency())) {
+            Timber.e("Not XMR");
+            sCurrency.setSelection(0, true);
+            balanceCurrency = Helper.BASE_CRYPTO;
+            balanceRate = 1.0;
+        } else {
+            int spinnerPosition = ((ArrayAdapter) sCurrency.getAdapter()).getPosition(exchangeRate.getQuoteCurrency());
+            if (spinnerPosition < 0) { // requested currency not in list
+                Timber.e("Requested currency not in list %s", exchangeRate.getQuoteCurrency());
+                sCurrency.setSelection(0, true);
+            } else {
+                sCurrency.setSelection(spinnerPosition, true);
+            }
+            balanceCurrency = exchangeRate.getQuoteCurrency();
+            balanceRate = exchangeRate.getRate();
+        }
+        updateBalance();
+    }
+
+    // Callbacks from TransactionInfoAdapter
+    @Override
+    public void onInteraction(final View view, final TransactionInfo infoItem) {
+        activityCallback.onTxDetailsRequest(view, infoItem);
+    }
+
+    // if account index has changed scroll to top?
+    private int accountIndex = 0;
+
+    public void onRefreshed(final Wallet wallet, boolean full) {
+        Timber.d("onRefreshed(%b)", full);
+
+        if (adapter.needsTransactionUpdateOnNewBlock()) {
+            wallet.refreshHistory();
+            full = true;
+        }
+        if (full) {
+            List<TransactionInfo> list = new ArrayList<>();
+            final long streetHeight = activityCallback.getStreetModeHeight();
+            Timber.d("StreetHeight=%d", streetHeight);
+            wallet.refreshHistory();
+            for (TransactionInfo info : wallet.getHistory().getAll()) {
+                Timber.d("TxHeight=%d, Label=%s", info.blockheight, info.subaddressLabel);
+                if ((info.isPending || (info.blockheight >= streetHeight))
+                        && !dismissedTransactions.contains(info.hash))
+                    list.add(info);
+            }
+            adapter.setInfos(list);
+            if (accountIndex != wallet.getAccountIndex()) {
+                accountIndex = wallet.getAccountIndex();
+                txlist.scrollToPosition(0);
+            }
+        }
+        updateStatus(wallet);
+    }
+
+    public void onSynced() {
+        if (!activityCallback.isWatchOnly()) {
+            bSend.setVisibility(View.VISIBLE);
+            bSend.setEnabled(true);
+        }
+        if (isVisible()) enableAccountsList(true); //otherwise it is enabled in onResume()
+    }
+
+    public void unsync() {
+        if (!activityCallback.isWatchOnly()) {
+            bSend.setVisibility(View.INVISIBLE);
+            bSend.setEnabled(false);
+        }
+        if (isVisible()) enableAccountsList(false); //otherwise it is enabled in onResume()
+        firstBlock = 0;
+    }
+
+    boolean walletLoaded = false;
+
+    public void onLoaded() {
+        walletLoaded = true;
+        showReceive();
+    }
+
+    private void showReceive() {
+        if (walletLoaded) {
+            bReceive.setVisibility(View.VISIBLE);
+            bReceive.setEnabled(true);
+        }
+    }
+
+    private String syncText = null;
+
+    public void setProgress(final String text) {
+        syncText = text;
+        tvProgress.setText(text);
+    }
+
+    private int syncProgress = -1;
+
+    public void setProgress(final int n) {
+        syncProgress = n;
+        if (n > 100) {
+            pbProgress.setIndeterminate(true);
+            pbProgress.setVisibility(View.VISIBLE);
+        } else if (n >= 0) {
+            pbProgress.setIndeterminate(false);
+            pbProgress.setProgress(n);
+            pbProgress.setVisibility(View.VISIBLE);
+        } else { // <0
+            pbProgress.setVisibility(View.INVISIBLE);
+        }
+    }
+
+    void setActivityTitle(Wallet wallet) {
+        if (wallet == null) return;
+        walletTitle = wallet.getName();
+        walletSubtitle = wallet.getAccountLabel();
+        activityCallback.setTitle(walletTitle, walletSubtitle);
+        Timber.d("wallet title is %s", walletTitle);
+    }
+
+    private long firstBlock = 0;
+    private String walletTitle = null;
+    private String walletSubtitle = null;
+    private long unlockedBalance = 0;
+    private long balance = 0;
+
+    private int accountIdx = -1;
+
+    private void updateStatus(Wallet wallet) {
+        if (!isAdded()) return;
+        Timber.d("updateStatus()");
+        if ((walletTitle == null) || (accountIdx != wallet.getAccountIndex())) {
+            accountIdx = wallet.getAccountIndex();
+            setActivityTitle(wallet);
+        }
+        balance = wallet.getBalance();
+        unlockedBalance = wallet.getUnlockedBalance();
+        refreshBalance();
+        String sync;
+        if (!activityCallback.hasBoundService())
+            throw new IllegalStateException("WalletService not bound.");
+        Wallet.ConnectionStatus daemonConnected = activityCallback.getConnectionStatus();
+        if (daemonConnected == Wallet.ConnectionStatus.ConnectionStatus_Connected) {
+            if (!wallet.isSynchronized()) {
+                long daemonHeight = activityCallback.getDaemonHeight();
+                long walletHeight = wallet.getBlockChainHeight();
+                long n = daemonHeight - walletHeight;
+                sync = getString(R.string.status_syncing) + " " + formatter.format(n) + " " + getString(R.string.status_remaining);
+                if (firstBlock == 0) {
+                    firstBlock = walletHeight;
+                }
+                int x = 100 - Math.round(100f * n / (1f * daemonHeight - firstBlock));
+                if (x == 0) x = 101; // indeterminate
+                setProgress(x);
+                ivSynced.setVisibility(View.GONE);
+            } else {
+                sync = getString(R.string.status_synced) + " " + formatter.format(wallet.getBlockChainHeight());
+                ivSynced.setVisibility(View.VISIBLE);
+            }
+        } else {
+            sync = getString(R.string.status_wallet_connecting);
+            setProgress(101);
+        }
+        setProgress(sync);
+        // TODO show connected status somewhere
+    }
+
+    Listener activityCallback;
+
+    // Container Activity must implement this interface
+    public interface Listener {
+        boolean hasBoundService();
+
+        void forceUpdate();
+
+        Wallet.ConnectionStatus getConnectionStatus();
+
+        long getDaemonHeight(); //mBoundService.getDaemonHeight();
+
+        void onSendRequest(View view);
+
+        void onTxDetailsRequest(View view, TransactionInfo info);
+
+        boolean isSynced();
+
+        boolean isStreetMode();
+
+        long getStreetModeHeight();
+
+        boolean isWatchOnly();
+
+        String getTxKey(String txId);
+
+        void onWalletReceive(View view);
+
+        boolean hasWallet();
+
+        Wallet getWallet();
+
+        void setToolbarButton(int type);
+
+        void setTitle(String title, String subtitle);
+
+        void setSubtitle(String subtitle);
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            this.activityCallback = (Listener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume()");
+        activityCallback.setTitle(walletTitle, walletSubtitle);
+        activityCallback.setToolbarButton(Toolbar.BUTTON_NONE);
+        setProgress(syncProgress);
+        setProgress(syncText);
+        showReceive();
+        if (activityCallback.isSynced()) enableAccountsList(true);
+    }
+
+    @Override
+    public void onPause() {
+        enableAccountsList(false);
+        super.onPause();
+    }
+
+    public interface DrawerLocker {
+        void setDrawerEnabled(boolean enabled);
+    }
+
+    private void enableAccountsList(boolean enable) {
+        if (activityCallback instanceof DrawerLocker) {
+            ((DrawerLocker) activityCallback).setDrawerEnabled(enable);
+        }
+    }
+
+    public void setStreetModeBackground(boolean enable) {
+        //TODO figure out why gunther disappears on return from send although he is still set
+        if (enable) {
+            if (streetGunther == null)
+                streetGunther = ContextCompat.getDrawable(requireContext(), R.drawable.ic_gunther_streetmode);
+            ivStreetGunther.setImageDrawable(streetGunther);
+        } else
+            ivStreetGunther.setImageDrawable(null);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/XmrWalletApplication.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2017 m2049r et al.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet;
+
+import android.app.Application;
+import android.content.Context;
+import android.content.res.Configuration;
+import android.os.Build;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.FragmentManager;
+
+import com.m2049r.xmrwallet.model.NetworkType;
+import com.m2049r.xmrwallet.util.LocaleHelper;
+import com.m2049r.xmrwallet.util.NetCipherHelper;
+import com.m2049r.xmrwallet.util.NightmodeHelper;
+
+import timber.log.Timber;
+
+public class XmrWalletApplication extends Application {
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        FragmentManager.enableNewStateManager(false);
+        if (BuildConfig.DEBUG) {
+            Timber.plant(new Timber.DebugTree());
+        }
+
+        NightmodeHelper.setPreferredNightmode(this);
+
+        NetCipherHelper.createInstance(this);
+    }
+
+    @Override
+    protected void attachBaseContext(Context context) {
+        super.attachBaseContext(LocaleHelper.setPreferredLocale(context));
+    }
+
+    @Override
+    public void onConfigurationChanged(@NonNull Configuration configuration) {
+        super.onConfigurationChanged(configuration);
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            LocaleHelper.updateSystemDefaultLocale(configuration.getLocales().get(0));
+        } else {
+            LocaleHelper.updateSystemDefaultLocale(configuration.locale);
+        }
+        LocaleHelper.setPreferredLocale(this);
+    }
+
+    static public NetworkType getNetworkType() {
+        switch (BuildConfig.FLAVOR_net) {
+            case "mainnet":
+                return NetworkType.NetworkType_Mainnet;
+            case "stagenet":
+                return NetworkType.NetworkType_Stagenet;
+            case "devnet": // flavors cannot start with "test"
+                return NetworkType.NetworkType_Testnet;
+            default:
+                throw new IllegalStateException("unknown net flavor " + BuildConfig.FLAVOR_net);
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/BarcodeData.java

@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import android.net.Uri;
+
+import com.m2049r.xmrwallet.util.OpenAliasHelper;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import lombok.ToString;
+import timber.log.Timber;
+
+@ToString
+public class BarcodeData {
+    public enum Security {
+        NORMAL,
+        OA_NO_DNSSEC,
+        OA_DNSSEC
+    }
+
+    final public Crypto asset;
+    final public List<Crypto> ambiguousAssets;
+    final public String address;
+    final public String addressName;
+    final public String amount;
+    final public String description;
+    final public Security security;
+
+    public BarcodeData(List<Crypto> assets, String address) {
+        if (assets.isEmpty())
+            throw new IllegalArgumentException("no assets specified");
+        this.addressName = null;
+        this.description = null;
+        this.amount = null;
+        this.security = Security.NORMAL;
+        this.address = address;
+        if (assets.size() == 1) {
+            this.asset = assets.get(0);
+            this.ambiguousAssets = null;
+        } else {
+            this.asset = null;
+            this.ambiguousAssets = assets;
+        }
+    }
+
+    public BarcodeData(Crypto asset, String address, String description, String amount) {
+        this(asset, address, null, description, amount, Security.NORMAL);
+    }
+
+    public BarcodeData(Crypto asset, String address, String addressName, String description, String amount, Security security) {
+        this.ambiguousAssets = null;
+        this.asset = asset;
+        this.address = address;
+        this.addressName = addressName;
+        this.description = description;
+        this.amount = amount;
+        this.security = security;
+    }
+
+    public Uri getUri() {
+        return Uri.parse(getUriString());
+    }
+
+    public String getUriString() {
+        if (asset != Crypto.XMR) throw new IllegalStateException("We can only do XMR stuff!");
+        StringBuilder sb = new StringBuilder();
+        sb.append(Crypto.XMR.getUriScheme())
+                .append(':')
+                .append(address);
+        boolean first = true;
+        if ((description != null) && !description.isEmpty()) {
+            sb.append(first ? "?" : "&");
+            first = false;
+            sb.append(Crypto.XMR.getUriMessage()).append('=').append(Uri.encode(description));
+        }
+        if ((amount != null) && !amount.isEmpty()) {
+            sb.append(first ? "?" : "&");
+            sb.append(Crypto.XMR.getUriAmount()).append('=').append(amount);
+        }
+        return sb.toString();
+    }
+
+    static private BarcodeData parseNaked(String address) {
+        List<Crypto> possibleAssets = new ArrayList<>();
+        for (Crypto crypto : Crypto.values()) {
+            if (crypto.validate(address)) {
+                possibleAssets.add(crypto);
+            }
+        }
+        if (possibleAssets.isEmpty())
+            return null;
+        return new BarcodeData(possibleAssets, address);
+    }
+
+    static public BarcodeData parseUri(String uriString) {
+        Timber.d("parseBitUri=%s", uriString);
+
+        URI uri;
+        try {
+            uri = new URI(uriString);
+        } catch (URISyntaxException ex) {
+            return null;
+        }
+        if (!uri.isOpaque()) return null;
+        final String scheme = uri.getScheme();
+        Crypto crypto = Crypto.withScheme(scheme);
+        if (crypto == null) return null;
+
+        String[] parts = uri.getRawSchemeSpecificPart().split("[?]");
+        if ((parts.length <= 0) || (parts.length > 2)) {
+            Timber.d("invalid number of parts %d", parts.length);
+            return null;
+        }
+
+        Map<String, String> parms = new HashMap<>();
+        if (parts.length == 2) {
+            String[] args = parts[1].split("&");
+            for (String arg : args) {
+                String[] namevalue = arg.split("=");
+                if (namevalue.length == 0) {
+                    continue;
+                }
+                parms.put(Uri.decode(namevalue[0]).toLowerCase(),
+                        namevalue.length > 1 ? Uri.decode(namevalue[1]) : "");
+            }
+        }
+
+        String addressName = parms.get(crypto.getUriLabel());
+        String description = parms.get(crypto.getUriMessage());
+        String address = parts[0]; // no need to decode as there can be no special characters
+        if (address.isEmpty()) {
+            Timber.d("no address");
+            return null;
+        }
+        if (!crypto.validate(address)) {
+            Timber.d("%s address (%s) invalid", crypto, address);
+            return null;
+        }
+        String amount = parms.get(crypto.getUriAmount());
+        if ((amount != null) && (!amount.isEmpty())) {
+            try {
+                Double.parseDouble(amount);
+            } catch (NumberFormatException ex) {
+                Timber.d(ex.getLocalizedMessage());
+                return null; // we have an amount but its not a number!
+            }
+        }
+        return new BarcodeData(crypto, address, addressName, description, amount, Security.NORMAL);
+    }
+
+
+    static public BarcodeData fromString(String qrCode) {
+        BarcodeData bcData = parseUri(qrCode);
+        if (bcData == null) {
+            // maybe it's naked?
+            bcData = parseNaked(qrCode);
+        }
+        if (bcData == null) {
+            // check for OpenAlias
+            bcData = parseOpenAlias(qrCode, false);
+        }
+        return bcData;
+    }
+
+    static public BarcodeData parseOpenAlias(String oaString, boolean dnssec) {
+        Timber.d("parseOpenAlias=%s", oaString);
+        if (oaString == null) return null;
+
+        Map<String, String> oaAttrs = OpenAliasHelper.parse(oaString);
+        if (oaAttrs == null) return null;
+
+        String oaAsset = oaAttrs.get(OpenAliasHelper.OA1_ASSET);
+        if (oaAsset == null) return null;
+
+        String address = oaAttrs.get(OpenAliasHelper.OA1_ADDRESS);
+        if (address == null) return null;
+
+        Crypto crypto = Crypto.withSymbol(oaAsset);
+        if (crypto == null) {
+            Timber.i("Unsupported OpenAlias asset %s", oaAsset);
+            return null;
+        }
+        if (!crypto.validate(address)) {
+            Timber.d("%s address invalid", crypto);
+            return null;
+        }
+
+        String description = oaAttrs.get(OpenAliasHelper.OA1_DESCRIPTION);
+        if (description == null) {
+            description = oaAttrs.get(OpenAliasHelper.OA1_NAME);
+        }
+        String amount = oaAttrs.get(OpenAliasHelper.OA1_AMOUNT);
+        String addressName = oaAttrs.get(OpenAliasHelper.OA1_NAME);
+
+        if (amount != null) {
+            try {
+                Double.parseDouble(amount);
+            } catch (NumberFormatException ex) {
+                Timber.d(ex.getLocalizedMessage());
+                return null; // we have an amount but its not a number!
+            }
+        }
+
+        Security sec = dnssec ? BarcodeData.Security.OA_DNSSEC : BarcodeData.Security.OA_NO_DNSSEC;
+
+        return new BarcodeData(crypto, address, addressName, description, amount, sec);
+    }
+
+    public boolean isAmbiguous() {
+        return ambiguousAssets != null;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/Crypto.java

@@ -0,0 +1,89 @@
+package com.m2049r.xmrwallet.data;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.validator.BitcoinAddressType;
+import com.m2049r.xmrwallet.util.validator.BitcoinAddressValidator;
+import com.m2049r.xmrwallet.util.validator.EthAddressValidator;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+public enum Crypto {
+    XMR("XMR", true, "monero:tx_amount:recipient_name:tx_description", R.id.ibXMR, R.drawable.ic_monero, R.drawable.ic_monero_bw, Wallet::isAddressValid),
+    BTC("BTC", true, "bitcoin:amount:label:message", R.id.ibBTC, R.drawable.ic_xmrto_btc, R.drawable.ic_xmrto_btc_off, address -> {
+        return BitcoinAddressValidator.validate(address, BitcoinAddressType.BTC);
+    }),
+    DASH("DASH", true, "dash:amount:label:message", R.id.ibDASH, R.drawable.ic_xmrto_dash, R.drawable.ic_xmrto_dash_off, address -> {
+        return BitcoinAddressValidator.validate(address, BitcoinAddressType.DASH);
+    }),
+    DOGE("DOGE", true, "dogecoin:amount:label:message", R.id.ibDOGE, R.drawable.ic_xmrto_doge, R.drawable.ic_xmrto_doge_off, address -> {
+        return BitcoinAddressValidator.validate(address, BitcoinAddressType.DOGE);
+    }),
+    ETH("ETH", false, "ethereum:amount:label:message", R.id.ibETH, R.drawable.ic_xmrto_eth, R.drawable.ic_xmrto_eth_off, EthAddressValidator::validate),
+    LTC("LTC", true, "litecoin:amount:label:message", R.id.ibLTC, R.drawable.ic_xmrto_ltc, R.drawable.ic_xmrto_ltc_off, address -> {
+        return BitcoinAddressValidator.validate(address, BitcoinAddressType.LTC);
+    });
+
+    @Getter
+    @NonNull
+    private final String symbol;
+    @Getter
+    private final boolean casefull;
+    @NonNull
+    private final String uriSpec;
+    @Getter
+    private final int buttonId;
+    @Getter
+    private final int iconEnabledId;
+    @Getter
+    private final int iconDisabledId;
+    @NonNull
+    private final Validator validator;
+
+    @Nullable
+    public static Crypto withScheme(@NonNull String scheme) {
+        for (Crypto crypto : values()) {
+            if (crypto.getUriScheme().equals(scheme)) return crypto;
+        }
+        return null;
+    }
+
+    @Nullable
+    public static Crypto withSymbol(@NonNull String symbol) {
+        final String upperSymbol = symbol.toUpperCase();
+        for (Crypto crypto : values()) {
+            if (crypto.symbol.equals(upperSymbol)) return crypto;
+        }
+        return null;
+    }
+
+    interface Validator {
+        boolean validate(String address);
+    }
+
+    // TODO maybe cache these segments
+    String getUriScheme() {
+        return uriSpec.split(":")[0];
+    }
+
+    String getUriAmount() {
+        return uriSpec.split(":")[1];
+    }
+
+    String getUriLabel() {
+        return uriSpec.split(":")[2];
+    }
+
+    String getUriMessage() {
+        return uriSpec.split(":")[3];
+    }
+
+    boolean validate(String address) {
+        return validator.validate(address);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/DefaultNodes.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2020 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+// Nodes stolen from https://moneroworld.com/#nodes
+
+@AllArgsConstructor
+public enum DefaultNodes {
+    MONERUJO("nodex.monerujo.io:18081"),
+    XMRTO("node.xmr.to:18081"),
+    SUPPORTXMR("node.supportxmr.com:18081"),
+    HASHVAULT("nodes.hashvault.pro:18081"),
+    MONEROWORLD("node.moneroworld.com:18089"),
+    XMRTW("opennode.xmr-tw.org:18089"),
+    MONERUJO_ONION("monerujods7mbghwe6cobdr6ujih6c22zu5rl7zshmizz2udf7v7fsad.onion:18081/mainnet/monerujo.onion"),
+    Criminales78("56wl7y2ebhamkkiza4b7il4mrzwtyvpdym7bm2bkg3jrei2je646k3qd.onion:18089/mainnet/Criminales78.onion"),
+    xmrfail("mxcd4577fldb3ppzy7obmmhnu3tf57gbcbd4qhwr2kxyjj2qi3dnbfqd.onion:18081/mainnet/xmrfail.onion"),
+    boldsuck("6dsdenp6vjkvqzy4wzsnzn6wixkdzihx3khiumyzieauxuxslmcaeiad.onion:18081/mainnet/boldsuck.onion");
+
+    @Getter
+    private final String uri;
+}

app/src/main/java/com/m2049r/xmrwallet/data/Node.java

@@ -0,0 +1,371 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import com.m2049r.xmrwallet.model.NetworkType;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.OnionHelper;
+
+import java.io.UnsupportedEncodingException;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.URLDecoder;
+import java.net.URLEncoder;
+import java.net.UnknownHostException;
+
+import lombok.Getter;
+import lombok.Setter;
+import timber.log.Timber;
+
+public class Node {
+    static public final String MAINNET = "mainnet";
+    static public final String STAGENET = "stagenet";
+    static public final String TESTNET = "testnet";
+
+    static class Address {
+        final private InetAddress inet;
+        final private String onion;
+
+        public boolean isOnion() {
+            return onion != null;
+        }
+
+        public String getHostName() {
+            if (inet != null) {
+                return inet.getHostName();
+            } else {
+                return onion;
+            }
+        }
+
+        public String getHostAddress() {
+            if (inet != null) {
+                return inet.getHostAddress();
+            } else {
+                return onion;
+            }
+        }
+
+        private Address(InetAddress address, String onion) {
+            this.inet = address;
+            this.onion = onion;
+        }
+
+        static Address of(InetAddress address) {
+            return new Address(address, null);
+        }
+
+        static Address of(String host) throws UnknownHostException {
+            if (OnionHelper.isOnionHost(host)) {
+                return new Address(null, host);
+            } else {
+                return new Address(InetAddress.getByName(host), null);
+            }
+        }
+
+        @Override
+        public int hashCode() {
+            return getHostAddress().hashCode();
+        }
+
+        @Override
+        public boolean equals(Object other) {
+            return (other instanceof Address) && (getHostAddress().equals(((Address) other).getHostAddress()));
+        }
+    }
+
+    @Getter
+    private String name = null;
+    @Getter
+    final private NetworkType networkType;
+    Address hostAddress;
+    @Getter
+    private String host;
+    @Getter
+    @Setter
+    int rpcPort = 0;
+    private int levinPort = 0;
+    @Getter
+    @Setter
+    private String username = "";
+    @Getter
+    @Setter
+    private String password = "";
+    @Getter
+    @Setter
+    private boolean favourite = false;
+    @Getter
+    @Setter
+    private boolean selected = false;
+
+    @Override
+    public int hashCode() {
+        return hostAddress.hashCode();
+    }
+
+    // Nodes are equal if they are the same host address:port & are on the same network
+    @Override
+    public boolean equals(Object other) {
+        if (!(other instanceof Node)) return false;
+        final Node anotherNode = (Node) other;
+        return (hostAddress.equals(anotherNode.hostAddress)
+                && (rpcPort == anotherNode.rpcPort)
+                && (networkType == anotherNode.networkType));
+    }
+
+    public boolean isOnion() {
+        return hostAddress.isOnion();
+    }
+
+    static public Node fromString(String nodeString) {
+        try {
+            return new Node(nodeString);
+        } catch (IllegalArgumentException ex) {
+            Timber.w(ex);
+            return null;
+        }
+    }
+
+    Node(String nodeString) {
+        if ((nodeString == null) || nodeString.isEmpty())
+            throw new IllegalArgumentException("daemon is empty");
+        String daemonAddress;
+        String a[] = nodeString.split("@");
+        if (a.length == 1) { // no credentials
+            daemonAddress = a[0];
+            username = "";
+            password = "";
+        } else if (a.length == 2) { // credentials
+            String userPassword[] = a[0].split(":");
+            if (userPassword.length != 2)
+                throw new IllegalArgumentException("User:Password invalid");
+            username = userPassword[0];
+            if (!username.isEmpty()) {
+                password = userPassword[1];
+            } else {
+                password = "";
+            }
+            daemonAddress = a[1];
+        } else {
+            throw new IllegalArgumentException("Too many @");
+        }
+
+        String daParts[] = daemonAddress.split("/");
+        if ((daParts.length > 3) || (daParts.length < 1))
+            throw new IllegalArgumentException("Too many '/' or too few");
+
+        daemonAddress = daParts[0];
+        String da[] = daemonAddress.split(":");
+        if ((da.length > 2) || (da.length < 1))
+            throw new IllegalArgumentException("Too many ':' or too few");
+        String host = da[0];
+
+        if (daParts.length == 1) {
+            networkType = NetworkType.NetworkType_Mainnet;
+        } else {
+            switch (daParts[1]) {
+                case MAINNET:
+                    networkType = NetworkType.NetworkType_Mainnet;
+                    break;
+                case STAGENET:
+                    networkType = NetworkType.NetworkType_Stagenet;
+                    break;
+                case TESTNET:
+                    networkType = NetworkType.NetworkType_Testnet;
+                    break;
+                default:
+                    throw new IllegalArgumentException("invalid net: " + daParts[1]);
+            }
+        }
+        if (networkType != WalletManager.getInstance().getNetworkType())
+            throw new IllegalArgumentException("wrong net: " + networkType);
+
+        String name = host;
+        if (daParts.length == 3) {
+            try {
+                name = URLDecoder.decode(daParts[2], "UTF-8");
+            } catch (UnsupportedEncodingException ex) {
+                Timber.w(ex); // if we can't encode it, we don't use it
+            }
+        }
+        this.name = name;
+
+        int port;
+        if (da.length == 2) {
+            try {
+                port = Integer.parseInt(da[1]);
+            } catch (NumberFormatException ex) {
+                throw new IllegalArgumentException("Port not numeric");
+            }
+        } else {
+            port = getDefaultRpcPort();
+        }
+        try {
+            setHost(host);
+        } catch (UnknownHostException ex) {
+            throw new IllegalArgumentException("cannot resolve host " + host);
+        }
+        this.rpcPort = port;
+        this.levinPort = getDefaultLevinPort();
+    }
+
+    public String toNodeString() {
+        return toString();
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        if (!username.isEmpty() && !password.isEmpty()) {
+            sb.append(username).append(":").append(password).append("@");
+        }
+        sb.append(host).append(":").append(rpcPort);
+        sb.append("/");
+        switch (networkType) {
+            case NetworkType_Mainnet:
+                sb.append(MAINNET);
+                break;
+            case NetworkType_Stagenet:
+                sb.append(STAGENET);
+                break;
+            case NetworkType_Testnet:
+                sb.append(TESTNET);
+                break;
+        }
+        if (name != null)
+            try {
+                sb.append("/").append(URLEncoder.encode(name, "UTF-8"));
+            } catch (UnsupportedEncodingException ex) {
+                Timber.w(ex); // if we can't encode it, we don't store it
+            }
+        return sb.toString();
+    }
+
+    public Node() {
+        this.networkType = WalletManager.getInstance().getNetworkType();
+    }
+
+    // constructor used for created nodes from retrieved peer lists
+    public Node(InetSocketAddress socketAddress) {
+        this();
+        this.hostAddress = Address.of(socketAddress.getAddress());
+        this.host = socketAddress.getHostString();
+        this.rpcPort = 0; // unknown
+        this.levinPort = socketAddress.getPort();
+        this.username = "";
+        this.password = "";
+    }
+
+    public String getAddress() {
+        return getHostAddress() + ":" + rpcPort;
+    }
+
+    public String getHostAddress() {
+        return hostAddress.getHostAddress();
+    }
+
+    public void setHost(String host) throws UnknownHostException {
+        if ((host == null) || (host.isEmpty()))
+            throw new UnknownHostException("loopback not supported (yet?)");
+        this.host = host;
+        this.hostAddress = Address.of(host);
+    }
+
+    public void setDefaultName() {
+        if (name != null) return;
+        String nodeName = hostAddress.getHostName();
+        if (hostAddress.isOnion()) {
+            nodeName = nodeName.substring(0, nodeName.length() - ".onion".length());
+            if (nodeName.length() > 16) {
+                nodeName = nodeName.substring(0, 8) + "…" + nodeName.substring(nodeName.length() - 6);
+            }
+            nodeName = nodeName + ".onion";
+        }
+        this.name = nodeName;
+    }
+
+    public void setName(String name) {
+        if ((name == null) || (name.isEmpty()))
+            setDefaultName();
+        else
+            this.name = name;
+    }
+
+    public void toggleFavourite() {
+        favourite = !favourite;
+    }
+
+    public Node(Node anotherNode) {
+        networkType = anotherNode.networkType;
+        overwriteWith(anotherNode);
+    }
+
+    public void overwriteWith(Node anotherNode) {
+        if (networkType != anotherNode.networkType)
+            throw new IllegalStateException("network types do not match");
+        name = anotherNode.name;
+        hostAddress = anotherNode.hostAddress;
+        host = anotherNode.host;
+        rpcPort = anotherNode.rpcPort;
+        levinPort = anotherNode.levinPort;
+        username = anotherNode.username;
+        password = anotherNode.password;
+        favourite = anotherNode.favourite;
+    }
+
+    static private int DEFAULT_LEVIN_PORT = 0;
+
+    // every node knows its network, but they are all the same
+    static public int getDefaultLevinPort() {
+        if (DEFAULT_LEVIN_PORT > 0) return DEFAULT_LEVIN_PORT;
+        switch (WalletManager.getInstance().getNetworkType()) {
+            case NetworkType_Mainnet:
+                DEFAULT_LEVIN_PORT = 18080;
+                break;
+            case NetworkType_Testnet:
+                DEFAULT_LEVIN_PORT = 28080;
+                break;
+            case NetworkType_Stagenet:
+                DEFAULT_LEVIN_PORT = 38080;
+                break;
+            default:
+                throw new IllegalStateException("unsupported net " + WalletManager.getInstance().getNetworkType());
+        }
+        return DEFAULT_LEVIN_PORT;
+    }
+
+    static private int DEFAULT_RPC_PORT = 0;
+
+    // every node knows its network, but they are all the same
+    static public int getDefaultRpcPort() {
+        if (DEFAULT_RPC_PORT > 0) return DEFAULT_RPC_PORT;
+        switch (WalletManager.getInstance().getNetworkType()) {
+            case NetworkType_Mainnet:
+                DEFAULT_RPC_PORT = 18081;
+                break;
+            case NetworkType_Testnet:
+                DEFAULT_RPC_PORT = 28081;
+                break;
+            case NetworkType_Stagenet:
+                DEFAULT_RPC_PORT = 38081;
+                break;
+            default:
+                throw new IllegalStateException("unsupported net " + WalletManager.getInstance().getNetworkType());
+        }
+        return DEFAULT_RPC_PORT;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/NodeInfo.java

@@ -0,0 +1,303 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import android.content.Context;
+import android.text.Html;
+import android.text.Spanned;
+import android.widget.TextView;
+
+import androidx.core.content.ContextCompat;
+
+import com.m2049r.levin.scanner.LevinPeer;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.util.NetCipherHelper;
+import com.m2049r.xmrwallet.util.NetCipherHelper.Request;
+import com.m2049r.xmrwallet.util.NodePinger;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+import java.util.Calendar;
+import java.util.Comparator;
+
+import lombok.Getter;
+import lombok.Setter;
+import okhttp3.HttpUrl;
+import okhttp3.Response;
+import okhttp3.ResponseBody;
+import timber.log.Timber;
+
+public class NodeInfo extends Node {
+    final static public int MIN_MAJOR_VERSION = 14;
+    final static public String RPC_VERSION = "2.0";
+
+    @Getter
+    private long height = 0;
+    @Getter
+    private long timestamp = 0;
+    @Getter
+    private int majorVersion = 0;
+    @Getter
+    private double responseTime = Double.MAX_VALUE;
+    @Getter
+    private int responseCode = 0;
+    @Getter
+    private boolean tested = false;
+    @Getter
+    @Setter
+    private boolean selecting = false;
+
+    public void clear() {
+        height = 0;
+        majorVersion = 0;
+        responseTime = Double.MAX_VALUE;
+        responseCode = 0;
+        timestamp = 0;
+        tested = false;
+    }
+
+    static public NodeInfo fromString(String nodeString) {
+        try {
+            return new NodeInfo(nodeString);
+        } catch (IllegalArgumentException ex) {
+            return null;
+        }
+    }
+
+    public NodeInfo(NodeInfo anotherNode) {
+        super(anotherNode);
+        overwriteWith(anotherNode);
+    }
+
+    private SocketAddress levinSocketAddress = null;
+
+    synchronized public SocketAddress getLevinSocketAddress() {
+        if (levinSocketAddress == null) {
+            // use default peer port if not set - very few peers use nonstandard port
+            levinSocketAddress = new InetSocketAddress(hostAddress.getHostAddress(), getDefaultLevinPort());
+        }
+        return levinSocketAddress;
+    }
+
+    @Override
+    public int hashCode() {
+        return super.hashCode();
+    }
+
+    @Override
+    public boolean equals(Object other) {
+        return super.equals(other);
+    }
+
+    public NodeInfo(String nodeString) {
+        super(nodeString);
+    }
+
+    public NodeInfo(LevinPeer levinPeer) {
+        super(levinPeer.getSocketAddress());
+    }
+
+    public NodeInfo(InetSocketAddress address) {
+        super(address);
+    }
+
+    public NodeInfo() {
+        super();
+    }
+
+    public boolean isSuccessful() {
+        return (responseCode >= 200) && (responseCode < 300);
+    }
+
+    public boolean isUnauthorized() {
+        return responseCode == HttpURLConnection.HTTP_UNAUTHORIZED;
+    }
+
+    public boolean isValid() {
+        return isSuccessful() && (majorVersion >= MIN_MAJOR_VERSION) && (responseTime < Double.MAX_VALUE);
+    }
+
+    static public Comparator<NodeInfo> BestNodeComparator = (o1, o2) -> {
+        if (o1.isValid()) {
+            if (o2.isValid()) { // both are valid
+                // higher node wins
+                int heightDiff = (int) (o2.height - o1.height);
+                if (heightDiff != 0)
+                    return heightDiff;
+                // if they are equal, faster node wins
+                return (int) Math.signum(o1.responseTime - o2.responseTime);
+            } else {
+                return -1;
+            }
+        } else {
+            return 1;
+        }
+    };
+
+    public void overwriteWith(NodeInfo anotherNode) {
+        super.overwriteWith(anotherNode);
+        height = anotherNode.height;
+        timestamp = anotherNode.timestamp;
+        majorVersion = anotherNode.majorVersion;
+        responseTime = anotherNode.responseTime;
+        responseCode = anotherNode.responseCode;
+    }
+
+    public String toNodeString() {
+        return super.toString();
+    }
+
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append(super.toString());
+        sb.append("?rc=").append(responseCode);
+        sb.append("?v=").append(majorVersion);
+        sb.append("&h=").append(height);
+        sb.append("&ts=").append(timestamp);
+        if (responseTime < Double.MAX_VALUE) {
+            sb.append("&t=").append(responseTime).append("ms");
+        }
+        return sb.toString();
+    }
+
+    private static final int HTTP_TIMEOUT = 1000; //ms
+    public static final double PING_GOOD = HTTP_TIMEOUT / 3.0; //ms
+    public static final double PING_MEDIUM = 2 * PING_GOOD; //ms
+    public static final double PING_BAD = HTTP_TIMEOUT;
+
+    public boolean testRpcService() {
+        return testRpcService(rpcPort);
+    }
+
+    public boolean testRpcService(NodePinger.Listener listener) {
+        boolean result = testRpcService(rpcPort);
+        if (listener != null)
+            listener.publish(this);
+        return result;
+    }
+
+    private Request rpcServiceRequest(int port) {
+        final HttpUrl url = new HttpUrl.Builder()
+                .scheme("http")
+                .host(getHost())
+                .port(port)
+                .addPathSegment("json_rpc")
+                .build();
+        final String json = "{\"jsonrpc\":\"2.0\",\"id\":\"0\",\"method\":\"getlastblockheader\"}";
+        return new Request(url, json, getUsername(), getPassword());
+    }
+
+    private boolean testRpcService(int port) {
+        Timber.d("Testing %s", toNodeString());
+        clear();
+        if (hostAddress.isOnion() && !NetCipherHelper.isTor()) {
+            tested = true; // sortof
+            responseCode = 418; // I'm a teapot - or I need an Onion - who knows
+            return false; // autofail
+        }
+        try {
+            long ta = System.nanoTime();
+            try (Response response = rpcServiceRequest(port).execute()) {
+                Timber.d("%s: %s", response.code(), response.request().url());
+                responseTime = (System.nanoTime() - ta) / 1000000.0;
+                responseCode = response.code();
+                if (response.isSuccessful()) {
+                    ResponseBody respBody = response.body(); // closed through Response object
+                    if ((respBody != null) && (respBody.contentLength() < 2000)) { // sanity check
+                        final JSONObject json = new JSONObject(respBody.string());
+                        String rpcVersion = json.getString("jsonrpc");
+                        if (!RPC_VERSION.equals(rpcVersion))
+                            return false;
+                        final JSONObject result = json.getJSONObject("result");
+                        if (!result.has("credits")) // introduced in monero v0.15.0
+                            return false;
+                        final JSONObject header = result.getJSONObject("block_header");
+                        height = header.getLong("height");
+                        timestamp = header.getLong("timestamp");
+                        majorVersion = header.getInt("major_version");
+                        return true; // success
+                    }
+                }
+            }
+        } catch (IOException | JSONException ex) {
+            Timber.d("EX: %s", ex.getMessage()); //TODO: do something here (show error?)
+        } finally {
+            tested = true;
+        }
+        return false;
+    }
+
+    static final private int[] TEST_PORTS = {18089}; // check only opt-in port
+
+    public boolean findRpcService() {
+        // if already have an rpcPort, use that
+        if (rpcPort > 0) return testRpcService(rpcPort);
+        // otherwise try to find one
+        for (int port : TEST_PORTS) {
+            if (testRpcService(port)) { // found a service
+                this.rpcPort = port;
+                return true;
+            }
+        }
+        return false;
+    }
+
+    static public final int STALE_NODE_HOURS = 2;
+
+    public void showInfo(TextView view, String info, boolean isError) {
+        final Context ctx = view.getContext();
+        final Spanned text = Html.fromHtml(ctx.getString(R.string.status,
+                Integer.toHexString(ThemeHelper.getThemedColor(ctx, R.attr.positiveColor) & 0xFFFFFF),
+                Integer.toHexString(ThemeHelper.getThemedColor(ctx, android.R.attr.colorBackground) & 0xFFFFFF),
+                (hostAddress.isOnion() ? "&nbsp;.onion&nbsp;&nbsp;" : ""), " " + info));
+        view.setText(text);
+        if (isError)
+            view.setTextColor(ThemeHelper.getThemedColor(ctx, R.attr.colorError));
+        else
+            view.setTextColor(ThemeHelper.getThemedColor(ctx, android.R.attr.textColorSecondary));
+    }
+
+    public void showInfo(TextView view) {
+        if (!isTested()) {
+            showInfo(view, "", false);
+            return;
+        }
+        final Context ctx = view.getContext();
+        final long now = Calendar.getInstance().getTimeInMillis() / 1000;
+        final long secs = (now - timestamp);
+        final long mins = secs / 60;
+        final long hours = mins / 60;
+        final long days = hours / 24;
+        String info;
+        if (mins < 2) {
+            info = ctx.getString(R.string.node_updated_now, secs);
+        } else if (hours < 2) {
+            info = ctx.getString(R.string.node_updated_mins, mins);
+        } else if (days < 2) {
+            info = ctx.getString(R.string.node_updated_hours, hours);
+        } else {
+            info = ctx.getString(R.string.node_updated_days, days);
+        }
+        showInfo(view, info, hours >= STALE_NODE_HOURS);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/PendingTx.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import com.m2049r.xmrwallet.model.PendingTransaction;
+
+public class PendingTx {
+    final public PendingTransaction.Status status;
+    final public String error;
+    final public long amount;
+    final public long dust;
+    final public long fee;
+    final public String txId;
+    final public long txCount;
+
+    public PendingTx(PendingTransaction pendingTransaction) {
+        status = pendingTransaction.getStatus();
+        error = pendingTransaction.getErrorString();
+        amount = pendingTransaction.getAmount();
+        dust = pendingTransaction.getDust();
+        fee = pendingTransaction.getFee();
+        txId = pendingTransaction.getFirstTxId();
+        txCount = pendingTransaction.getTxCount();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/Subaddress.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import java.util.regex.Pattern;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.Setter;
+import lombok.ToString;
+
+@RequiredArgsConstructor
+@ToString
+@EqualsAndHashCode
+public class Subaddress implements Comparable<Subaddress> {
+    @Getter
+    final private int accountIndex;
+    @Getter
+    final private int addressIndex;
+    @Getter
+    final private String address;
+    @Getter
+    private final String label;
+    @Getter
+    @Setter
+    private long amount;
+
+    @Override
+    public int compareTo(Subaddress another) { // newer is <
+        final int compareAccountIndex = another.accountIndex - accountIndex;
+        if (compareAccountIndex == 0)
+            return another.addressIndex - addressIndex;
+        return compareAccountIndex;
+    }
+
+    public String getSquashedAddress() {
+        return address.substring(0, 8) + "…" + address.substring(address.length() - 8);
+    }
+
+    public static final Pattern DEFAULT_LABEL_FORMATTER = Pattern.compile("^[0-9]{4}-[0-9]{2}-[0-9]{2}-[0-9]{2}:[0-9]{2}:[0-9]{2}$");
+
+    public String getDisplayLabel() {
+        if (label.isEmpty() || (DEFAULT_LABEL_FORMATTER.matcher(label).matches()))
+            return ("#" + addressIndex);
+        else
+            return label;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/TxData.java

@@ -0,0 +1,149 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import com.m2049r.xmrwallet.model.PendingTransaction;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+
+// https://stackoverflow.com/questions/2139134/how-to-send-an-object-from-one-android-activity-to-another-using-intents
+public class TxData implements Parcelable {
+
+    public TxData() {
+    }
+
+    public TxData(TxData txData) {
+        this.dstAddr = txData.dstAddr;
+        this.amount = txData.amount;
+        this.mixin = txData.mixin;
+        this.priority = txData.priority;
+    }
+
+    public TxData(String dstAddr,
+                  long amount,
+                  int mixin,
+                  PendingTransaction.Priority priority) {
+        this.dstAddr = dstAddr;
+        this.amount = amount;
+        this.mixin = mixin;
+        this.priority = priority;
+    }
+
+    public String getDestinationAddress() {
+        return dstAddr;
+    }
+
+    public long getAmount() {
+        return amount;
+    }
+
+    public double getAmountAsDouble() {
+        return 1.0 * amount / Helper.ONE_XMR;
+    }
+
+    public int getMixin() {
+        return mixin;
+    }
+
+    public PendingTransaction.Priority getPriority() {
+        return priority;
+    }
+
+    public void setDestinationAddress(String dstAddr) {
+        this.dstAddr = dstAddr;
+    }
+
+    public void setAmount(long amount) {
+        this.amount = amount;
+    }
+
+    public void setAmount(double amount) {
+        this.amount = Wallet.getAmountFromDouble(amount);
+    }
+
+    public void setMixin(int mixin) {
+        this.mixin = mixin;
+    }
+
+    public void setPriority(PendingTransaction.Priority priority) {
+        this.priority = priority;
+    }
+
+    public UserNotes getUserNotes() {
+        return userNotes;
+    }
+
+    public void setUserNotes(UserNotes userNotes) {
+        this.userNotes = userNotes;
+    }
+
+    private String dstAddr;
+    private long amount;
+    private int mixin;
+    private PendingTransaction.Priority priority;
+
+    private UserNotes userNotes;
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeString(dstAddr);
+        out.writeLong(amount);
+        out.writeInt(mixin);
+        out.writeInt(priority.getValue());
+    }
+
+    // this is used to regenerate your object. All Parcelables must have a CREATOR that implements these two methods
+    public static final Parcelable.Creator<TxData> CREATOR = new Parcelable.Creator<TxData>() {
+        public TxData createFromParcel(Parcel in) {
+            return new TxData(in);
+        }
+
+        public TxData[] newArray(int size) {
+            return new TxData[size];
+        }
+    };
+
+    protected TxData(Parcel in) {
+        dstAddr = in.readString();
+        amount = in.readLong();
+        mixin = in.readInt();
+        priority = PendingTransaction.Priority.fromInteger(in.readInt());
+
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public String toString() {
+        StringBuffer sb = new StringBuffer();
+        sb.append("dstAddr:");
+        sb.append(dstAddr);
+        sb.append(",amount:");
+        sb.append(amount);
+        sb.append(",mixin:");
+        sb.append(mixin);
+        sb.append(",priority:");
+        sb.append(priority);
+        return sb.toString();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/TxDataBtc.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import android.os.Parcel;
+
+import androidx.annotation.NonNull;
+
+import lombok.Getter;
+import lombok.Setter;
+
+public class TxDataBtc extends TxData {
+    @Getter
+    @Setter
+    private String btcSymbol; // the actual non-XMR thing we're sending
+    @Getter
+    @Setter
+    private String xmrtoOrderId; // shown in success screen
+    @Getter
+    @Setter
+    private String btcAddress;
+    @Getter
+    @Setter
+    private double btcAmount;
+
+    public TxDataBtc() {
+        super();
+    }
+
+    public TxDataBtc(TxDataBtc txDataBtc) {
+        super(txDataBtc);
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        super.writeToParcel(out, flags);
+        out.writeString(btcSymbol);
+        out.writeString(xmrtoOrderId);
+        out.writeString(btcAddress);
+        out.writeDouble(btcAmount);
+    }
+
+    // this is used to regenerate your object. All Parcelables must have a CREATOR that implements these two methods
+    public static final Creator<TxDataBtc> CREATOR = new Creator<TxDataBtc>() {
+        public TxDataBtc createFromParcel(Parcel in) {
+            return new TxDataBtc(in);
+        }
+
+        public TxDataBtc[] newArray(int size) {
+            return new TxDataBtc[size];
+        }
+    };
+
+    protected TxDataBtc(Parcel in) {
+        super(in);
+        btcSymbol = in.readString();
+        xmrtoOrderId = in.readString();
+        btcAddress = in.readString();
+        btcAmount = in.readDouble();
+    }
+
+    @NonNull
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("xmrtoOrderId:");
+        sb.append(xmrtoOrderId);
+        sb.append(",btcSymbol:");
+        sb.append(btcSymbol);
+        sb.append(",btcAddress:");
+        sb.append(btcAddress);
+        sb.append(",btcAmount:");
+        sb.append(btcAmount);
+        return sb.toString();
+    }
+
+    public boolean validateAddress(@NonNull String address) {
+        if ((btcSymbol == null) || (btcAddress == null)) return false;
+        final Crypto crypto = Crypto.withSymbol(btcSymbol);
+        if (crypto == null) return false;
+        if (crypto.isCasefull()) { // compare as-is
+            return address.equals(btcAddress);
+        } else { // normalize & compare (e.g. ETH with and without checksum capitals
+            return address.toLowerCase().equals(btcAddress.toLowerCase());
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/data/UserNotes.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.data;
+
+import com.m2049r.xmrwallet.service.shift.sideshift.api.CreateOrder;
+import com.m2049r.xmrwallet.util.Helper;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class UserNotes {
+    public String txNotes = "";
+    public String note = "";
+    public String xmrtoTag = null;
+    public String xmrtoKey = null;
+    public String xmrtoAmount = null; // could be a double - but we are not doing any calculations
+    public String xmrtoCurrency = null;
+    public String xmrtoDestination = null;
+
+    public UserNotes(final String txNotes) {
+        if (txNotes == null) {
+            return;
+        }
+        this.txNotes = txNotes;
+        Pattern p = Pattern.compile("^\\{([a-z]+)-(\\w{6,}),([0-9.]*)([A-Z]+),(\\w*)\\} ?(.*)");
+        Matcher m = p.matcher(txNotes);
+        if (m.find()) {
+            xmrtoTag = m.group(1);
+            xmrtoKey = m.group(2);
+            xmrtoAmount = m.group(3);
+            xmrtoCurrency = m.group(4);
+            xmrtoDestination = m.group(5);
+            note = m.group(6);
+        } else {
+            note = txNotes;
+        }
+    }
+
+    public void setNote(String newNote) {
+        if (newNote != null) {
+            note = newNote;
+        } else {
+            note = "";
+        }
+        txNotes = buildTxNote();
+    }
+
+    public void setXmrtoOrder(CreateOrder order) {
+        if (order != null) {
+            xmrtoTag = order.TAG;
+            xmrtoKey = order.getOrderId();
+            xmrtoAmount = Helper.getDisplayAmount(order.getBtcAmount());
+            xmrtoCurrency = order.getBtcCurrency();
+            xmrtoDestination = order.getBtcAddress();
+        } else {
+            xmrtoTag = null;
+            xmrtoKey = null;
+            xmrtoAmount = null;
+            xmrtoDestination = null;
+        }
+        txNotes = buildTxNote();
+    }
+
+    private String buildTxNote() {
+        StringBuilder sb = new StringBuilder();
+        if (xmrtoKey != null) {
+            if ((xmrtoAmount == null) || (xmrtoDestination == null))
+                throw new IllegalArgumentException("Broken notes");
+            sb.append("{");
+            sb.append(xmrtoTag);
+            sb.append("-");
+            sb.append(xmrtoKey);
+            sb.append(",");
+            sb.append(xmrtoAmount);
+            sb.append(xmrtoCurrency);
+            sb.append(",");
+            sb.append(xmrtoDestination);
+            sb.append("}");
+            if ((note != null) && (!note.isEmpty()))
+                sb.append(" ");
+        }
+        sb.append(note);
+        return sb.toString();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/dialog/AboutFragment.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.dialog;
+
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+import android.text.Html;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.m2049r.xmrwallet.BuildConfig;
+import com.m2049r.xmrwallet.R;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+
+import timber.log.Timber;
+
+public class AboutFragment extends DialogFragment {
+    static final String TAG = "AboutFragment";
+
+    public static AboutFragment newInstance() {
+        return new AboutFragment();
+    }
+
+    public static void display(FragmentManager fm) {
+        FragmentTransaction ft = fm.beginTransaction();
+        Fragment prev = fm.findFragmentByTag(TAG);
+        if (prev != null) {
+            ft.remove(prev);
+        }
+
+        AboutFragment.newInstance().show(ft, TAG);
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_about, null);
+        ((TextView) view.findViewById(R.id.tvHelp)).setText(Html.fromHtml(getLicencesHtml()));
+        ((TextView) view.findViewById(R.id.tvVersion)).setText(getString(R.string.about_version, BuildConfig.VERSION_NAME, BuildConfig.VERSION_CODE));
+
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+                .setView(view)
+                .setNegativeButton(R.string.about_close,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int id) {
+                                dialog.dismiss();
+                            }
+                        });
+        return builder.create();
+    }
+
+    private String getLicencesHtml() {
+        try (BufferedReader reader = new BufferedReader(
+                new InputStreamReader(getContext().getAssets().open("licenses.html"), StandardCharsets.UTF_8))) {
+            StringBuilder sb = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null)
+                sb.append(line);
+            return sb.toString();
+        } catch (IOException ex) {
+            Timber.e(ex);
+            return ex.getLocalizedMessage();
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/dialog/CreditsFragment.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.dialog;
+
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.text.Html;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.m2049r.xmrwallet.R;
+
+public class CreditsFragment extends DialogFragment {
+    static final String TAG = "DonationFragment";
+
+    public static CreditsFragment newInstance() {
+        return new CreditsFragment();
+    }
+
+    public static void display(FragmentManager fm) {
+        FragmentTransaction ft = fm.beginTransaction();
+        Fragment prev = fm.findFragmentByTag(TAG);
+        if (prev != null) {
+            ft.remove(prev);
+        }
+
+        CreditsFragment.newInstance().show(ft, TAG);
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_credits, null);
+
+        ((TextView) view.findViewById(R.id.tvCredits)).setText(Html.fromHtml(getString(R.string.credits_text)));
+
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+                .setView(view)
+                .setNegativeButton(R.string.about_close,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int id) {
+                                dialog.dismiss();
+                            }
+                        });
+        return builder.create();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/dialog/HelpFragment.java

@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.dialog;
+
+import android.app.Dialog;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.os.Bundle;
+import android.text.Html;
+import android.text.Spanned;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.core.content.ContextCompat;
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.util.NetCipherHelper;
+
+public class HelpFragment extends DialogFragment {
+    static final String TAG = "HelpFragment";
+    private static final String HELP_ID = "HELP_ID";
+    private static final String TOR_BUTTON = "TOR";
+
+    public static HelpFragment newInstance(int helpResourceId) {
+        HelpFragment fragment = new HelpFragment();
+        Bundle bundle = new Bundle();
+        bundle.putInt(HELP_ID, helpResourceId);
+        // a hack for the tor button
+        if (helpResourceId == R.string.help_tor)
+            bundle.putInt(TOR_BUTTON, 7);
+        fragment.setArguments(bundle);
+        return fragment;
+    }
+
+    public static void display(FragmentManager fm, int helpResourceId) {
+        FragmentTransaction ft = fm.beginTransaction();
+        Fragment prev = fm.findFragmentByTag(TAG);
+        if (prev != null) {
+            ft.remove(prev);
+        }
+
+        HelpFragment.newInstance(helpResourceId).show(ft, TAG);
+    }
+
+    private Spanned getHtml(String html, double textSize) {
+        final Html.ImageGetter imageGetter = source -> {
+            final int imageId = getResources().getIdentifier(source.replace("/", ""), "drawable", requireActivity().getPackageName());
+            // Don't die if we don't find the image - use a heart instead
+            final Drawable drawable = ContextCompat.getDrawable(requireActivity(), imageId > 0 ? imageId : R.drawable.ic_favorite_24dp);
+            final double f = textSize / drawable.getIntrinsicHeight();
+            drawable.setBounds(0, 0, (int) (f * drawable.getIntrinsicWidth()), (int) textSize);
+            return drawable;
+        };
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            return Html.fromHtml(html, Html.FROM_HTML_MODE_LEGACY, imageGetter, null);
+        } else {
+            return Html.fromHtml(html, imageGetter, null);
+        }
+    }
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_help, null);
+
+        int helpId = 0;
+        boolean torButton = false;
+        Bundle arguments = getArguments();
+        if (arguments != null) {
+            helpId = arguments.getInt(HELP_ID);
+            torButton = arguments.getInt(TOR_BUTTON) > 0;
+        }
+        final TextView helpTv = view.findViewById(R.id.tvHelp);
+        if (helpId > 0)
+            helpTv.setText(getHtml(getString(helpId), helpTv.getTextSize()));
+
+        MaterialAlertDialogBuilder builder =
+                new MaterialAlertDialogBuilder(requireActivity())
+                        .setView(view);
+        if (torButton) {
+            builder.setNegativeButton(R.string.help_nok,
+                    (dialog, id) -> dialog.dismiss())
+                    .setPositiveButton(R.string.help_getorbot,
+                            (dialog, id) -> {
+                                dialog.dismiss();
+                                NetCipherHelper.getInstance().installOrbot(requireActivity());
+                            });
+        } else {
+            builder.setNegativeButton(R.string.help_ok,
+                    (dialog, id) -> dialog.dismiss());
+        }
+        return builder.create();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/dialog/PrivacyFragment.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.dialog;
+
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.os.Bundle;
+import android.text.Html;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.TextView;
+
+import androidx.fragment.app.DialogFragment;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.m2049r.xmrwallet.R;
+
+public class PrivacyFragment extends DialogFragment {
+    static final String TAG = "PrivacyFragment";
+
+    public static PrivacyFragment newInstance() {
+        return new PrivacyFragment();
+    }
+
+    public static void display(FragmentManager fm) {
+        FragmentTransaction ft = fm.beginTransaction();
+        Fragment prev = fm.findFragmentByTag(TAG);
+        if (prev != null) {
+            ft.remove(prev);
+        }
+
+        PrivacyFragment.newInstance().show(ft, TAG);
+    }
+
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        final View view = LayoutInflater.from(getActivity()).inflate(R.layout.fragment_privacy_policy, null);
+
+        ((TextView) view.findViewById(R.id.tvCredits)).setText(Html.fromHtml(getString(R.string.privacy_policy)));
+
+        MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(getActivity())
+                .setView(view)
+                .setNegativeButton(R.string.about_close,
+                        new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int id) {
+                                dialog.dismiss();
+                            }
+                        });
+        return builder.create();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/dialog/ProgressDialog.java

@@ -0,0 +1,132 @@
+package com.m2049r.xmrwallet.dialog;
+
+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ * Copyright (C) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import android.content.Context;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.WindowManager;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AlertDialog;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.util.Helper;
+
+import java.util.Locale;
+
+import timber.log.Timber;
+
+public class ProgressDialog extends AlertDialog {
+
+    private ProgressBar pbBar;
+
+    private TextView tvMessage;
+
+    private TextView tvProgress;
+
+    private View rlProgressBar, pbCircle;
+
+    static private final String PROGRESS_FORMAT = "%1d/%2d";
+
+    private CharSequence message;
+    private int maxValue, progressValue;
+    private boolean indeterminate = true;
+
+    public ProgressDialog(Context context) {
+        super(context);
+    }
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        final View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_ledger_progress, null);
+        pbCircle = view.findViewById(R.id.pbCircle);
+        tvMessage = view.findViewById(R.id.tvMessage);
+        rlProgressBar = view.findViewById(R.id.rlProgressBar);
+        pbBar = view.findViewById(R.id.pbBar);
+        tvProgress = view.findViewById(R.id.tvProgress);
+        setView(view);
+        setIndeterminate(indeterminate);
+        if (maxValue > 0) {
+            setMax(maxValue);
+        }
+        if (progressValue > 0) {
+            setProgress(progressValue);
+        }
+        if (message != null) {
+            Timber.d("msg=%s", message);
+            setMessage(message);
+        }
+
+        super.onCreate(savedInstanceState);
+
+        if (Helper.preventScreenshot()) {
+            getWindow().setFlags(WindowManager.LayoutParams.FLAG_SECURE, WindowManager.LayoutParams.FLAG_SECURE);
+        }
+    }
+
+    public void setProgress(int value, int max) {
+        progressValue = value;
+        maxValue = max;
+        if (pbBar != null) {
+            pbBar.setProgress(value);
+            pbBar.setMax(max);
+            tvProgress.setText(String.format(Locale.getDefault(), PROGRESS_FORMAT, value, maxValue));
+        }
+    }
+
+    public void setProgress(int value) {
+        progressValue = value;
+        if (pbBar != null) {
+            pbBar.setProgress(value);
+            tvProgress.setText(String.format(Locale.getDefault(), PROGRESS_FORMAT, value, maxValue));
+        }
+    }
+
+    public void setMax(int max) {
+        maxValue = max;
+        if (pbBar != null) {
+            pbBar.setMax(max);
+        }
+    }
+
+    public void setIndeterminate(boolean indeterminate) {
+        if (this.indeterminate != indeterminate) {
+            if (rlProgressBar != null) {
+                if (indeterminate) {
+                    pbCircle.setVisibility(View.VISIBLE);
+                    rlProgressBar.setVisibility(View.GONE);
+                } else {
+                    pbCircle.setVisibility(View.GONE);
+                    rlProgressBar.setVisibility(View.VISIBLE);
+                }
+            }
+            this.indeterminate = indeterminate;
+        }
+    }
+
+    @Override
+    public void setMessage(CharSequence message) {
+        this.message = message;
+        if (tvMessage != null) {
+            tvMessage.setText(message);
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendAddressWizardFragment.java

@@ -0,0 +1,525 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.content.Context;
+import android.nfc.NfcManager;
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.Html;
+import android.text.InputType;
+import android.text.Spanned;
+import android.text.TextWatcher;
+import android.util.Patterns;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.inputmethod.EditorInfo;
+import android.widget.EditText;
+import android.widget.ImageButton;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import androidx.annotation.NonNull;
+
+import com.google.android.material.textfield.TextInputLayout;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.BarcodeData;
+import com.m2049r.xmrwallet.data.Crypto;
+import com.m2049r.xmrwallet.data.TxData;
+import com.m2049r.xmrwallet.data.TxDataBtc;
+import com.m2049r.xmrwallet.data.UserNotes;
+import com.m2049r.xmrwallet.model.PendingTransaction;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.OpenAliasHelper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
+import com.m2049r.xmrwallet.util.validator.BitcoinAddressType;
+import com.m2049r.xmrwallet.util.validator.BitcoinAddressValidator;
+import com.m2049r.xmrwallet.util.validator.EthAddressValidator;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+import timber.log.Timber;
+
+public class SendAddressWizardFragment extends SendWizardFragment {
+
+    static final int INTEGRATED_ADDRESS_LENGTH = 106;
+
+    public static SendAddressWizardFragment newInstance(Listener listener) {
+        SendAddressWizardFragment instance = new SendAddressWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    Listener sendListener;
+
+    public void setSendListener(Listener listener) {
+        this.sendListener = listener;
+    }
+
+    public interface Listener {
+        void setBarcodeData(BarcodeData data);
+
+        BarcodeData getBarcodeData();
+
+        BarcodeData popBarcodeData();
+
+        void setMode(SendFragment.Mode mode);
+
+        TxData getTxData();
+    }
+
+    private EditText etDummy;
+    private TextInputLayout etAddress;
+    private TextInputLayout etNotes;
+    private TextView tvXmrTo;
+    private TextView tvTor;
+    private Map<Crypto, ImageButton> ibCrypto;
+    final private Set<Crypto> possibleCryptos = new HashSet<>();
+    private Crypto selectedCrypto = null;
+
+    private boolean resolvingOA = false;
+
+    OnScanListener onScanListener;
+
+    public interface OnScanListener {
+        void onScan();
+    }
+
+    private Crypto getCryptoForButton(ImageButton button) {
+        for (Map.Entry<Crypto, ImageButton> entry : ibCrypto.entrySet()) {
+            if (entry.getValue() == button) return entry.getKey();
+        }
+        return null;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        Timber.d("onCreateView() %s", (String.valueOf(savedInstanceState)));
+
+        View view = inflater.inflate(R.layout.fragment_send_address, container, false);
+
+        tvTor = view.findViewById(R.id.tvTor);
+        tvXmrTo = view.findViewById(R.id.tvXmrTo);
+        ibCrypto = new HashMap<>();
+        for (Crypto crypto : Crypto.values()) {
+            final ImageButton button = view.findViewById(crypto.getButtonId());
+            if (Helper.ALLOW_SHIFT || (crypto == Crypto.XMR)) {
+                ibCrypto.put(crypto, button);
+                button.setOnClickListener(v -> {
+                    if (possibleCryptos.contains(crypto)) {
+                        selectedCrypto = crypto;
+                        updateCryptoButtons(false);
+                    } else {
+                        // show help what to do:
+                        if (button.getId() != R.id.ibXMR) {
+                            final String name = getResources().getStringArray(R.array.cryptos)[crypto.ordinal()];
+                            final String symbol = getCryptoForButton(button).getSymbol();
+                            tvXmrTo.setText(Html.fromHtml(getString(R.string.info_xmrto_help, name, symbol)));
+                            tvXmrTo.setVisibility(View.VISIBLE);
+                        } else {
+                            tvXmrTo.setText(Html.fromHtml(getString(R.string.info_xmrto_help_xmr)));
+                            tvXmrTo.setVisibility(View.VISIBLE);
+                            tvTor.setVisibility(View.INVISIBLE);
+                        }
+                    }
+                });
+            } else {
+                button.setImageResource(crypto.getIconDisabledId());
+                button.setImageAlpha(128);
+                button.setEnabled(false);
+            }
+        }
+        if (!Helper.ALLOW_SHIFT) {
+            tvTor.setVisibility(View.VISIBLE);
+        }
+        updateCryptoButtons(true);
+
+        etAddress = view.findViewById(R.id.etAddress);
+        etAddress.getEditText().setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+        etAddress.getEditText().setOnEditorActionListener(new TextView.OnEditorActionListener() {
+            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
+                // ignore ENTER
+                return ((event != null) && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER));
+            }
+        });
+        etAddress.getEditText().setOnFocusChangeListener((v, hasFocus) -> {
+            if (!hasFocus) {
+                String enteredAddress = etAddress.getEditText().getText().toString().trim();
+                String dnsOA = dnsFromOpenAlias(enteredAddress);
+                Timber.d("OpenAlias is %s", dnsOA);
+                if (dnsOA != null) {
+                    processOpenAlias(dnsOA);
+                }
+            }
+        });
+        etAddress.getEditText().addTextChangedListener(new TextWatcher() {
+            @Override
+            public void afterTextChanged(Editable editable) {
+                Timber.d("AFTER: %s", editable.toString());
+                etAddress.setError(null);
+                possibleCryptos.clear();
+                selectedCrypto = null;
+                final String address = etAddress.getEditText().getText().toString();
+                if (isIntegratedAddress(address)) {
+                    Timber.d("isIntegratedAddress");
+                    possibleCryptos.add(Crypto.XMR);
+                    selectedCrypto = Crypto.XMR;
+                    etAddress.setError(getString(R.string.info_paymentid_integrated));
+                    sendListener.setMode(SendFragment.Mode.XMR);
+                } else if (isStandardAddress(address)) {
+                    Timber.d("isStandardAddress");
+                    possibleCryptos.add(Crypto.XMR);
+                    selectedCrypto = Crypto.XMR;
+                    sendListener.setMode(SendFragment.Mode.XMR);
+                }
+                if (!Helper.ALLOW_SHIFT) return;
+                if ((selectedCrypto == null) && isEthAddress(address)) {
+                    Timber.d("isEthAddress");
+                    possibleCryptos.add(Crypto.ETH);
+                    selectedCrypto = Crypto.ETH;
+                    tvXmrTo.setVisibility(View.VISIBLE);
+                    sendListener.setMode(SendFragment.Mode.BTC);
+                }
+                if (possibleCryptos.isEmpty()) {
+                    Timber.d("isBitcoinAddress");
+                    for (BitcoinAddressType type : BitcoinAddressType.values()) {
+                        if (BitcoinAddressValidator.validate(address, type)) {
+                            possibleCryptos.add(Crypto.valueOf(type.name()));
+                        }
+                    }
+                    if (!possibleCryptos.isEmpty()) // found something in need of shifting!
+                        sendListener.setMode(SendFragment.Mode.BTC);
+                    if (possibleCryptos.size() == 1) {
+                        selectedCrypto = (Crypto) possibleCryptos.toArray()[0];
+                    }
+                }
+                if (possibleCryptos.isEmpty()) {
+                    Timber.d("other");
+                    tvXmrTo.setVisibility(View.INVISIBLE);
+                    sendListener.setMode(SendFragment.Mode.XMR);
+                }
+                updateCryptoButtons(address.isEmpty());
+            }
+
+            @Override
+            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
+            }
+
+            @Override
+            public void onTextChanged(CharSequence s, int start, int before, int count) {
+            }
+        });
+
+        final ImageButton bPasteAddress = view.findViewById(R.id.bPasteAddress);
+        bPasteAddress.setOnClickListener(v -> {
+            final String clip = Helper.getClipBoardText(getActivity());
+            if (clip == null) return;
+            // clean it up
+            final String address = clip.replaceAll("( +)|(\\r?\\n?)", "");
+            BarcodeData bc = BarcodeData.fromString(address);
+            if (bc != null) {
+                processScannedData(bc);
+                final EditText et = etAddress.getEditText();
+                et.setSelection(et.getText().length());
+                etAddress.requestFocus();
+            } else {
+                Toast.makeText(getActivity(), getString(R.string.send_address_invalid), Toast.LENGTH_SHORT).show();
+            }
+        });
+
+        etNotes = view.findViewById(R.id.etNotes);
+        etNotes.getEditText().setRawInputType(InputType.TYPE_CLASS_TEXT);
+        etNotes.getEditText().
+
+                setOnEditorActionListener((v, actionId, event) -> {
+                    if ((event != null && (event.getKeyCode() == KeyEvent.KEYCODE_ENTER) && (event.getAction() == KeyEvent.ACTION_DOWN))
+                            || (actionId == EditorInfo.IME_ACTION_DONE)) {
+                        etDummy.requestFocus();
+                        return true;
+                    }
+                    return false;
+                });
+
+        final View cvScan = view.findViewById(R.id.bScan);
+        cvScan.setOnClickListener(v -> onScanListener.onScan());
+
+        etDummy = view.findViewById(R.id.etDummy);
+        etDummy.setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+        etDummy.requestFocus();
+
+        View tvNfc = view.findViewById(R.id.tvNfc);
+        NfcManager manager = (NfcManager) getContext().getSystemService(Context.NFC_SERVICE);
+        if ((manager != null) && (manager.getDefaultAdapter() != null))
+            tvNfc.setVisibility(View.VISIBLE);
+
+        return view;
+    }
+
+    private void selectedCrypto(Crypto crypto) {
+        final ImageButton button = ibCrypto.get(crypto);
+        button.setImageResource(crypto.getIconEnabledId());
+        button.setImageAlpha(255);
+        button.setEnabled(true);
+    }
+
+    private void possibleCrypto(Crypto crypto) {
+        final ImageButton button = ibCrypto.get(crypto);
+        button.setImageResource(crypto.getIconDisabledId());
+        button.setImageAlpha(255);
+        button.setEnabled(true);
+    }
+
+    private void impossibleCrypto(Crypto crypto) {
+        final ImageButton button = ibCrypto.get(crypto);
+        button.setImageResource(crypto.getIconDisabledId());
+        button.setImageAlpha(128);
+        button.setEnabled(true);
+    }
+
+    private void updateCryptoButtons(boolean noAddress) {
+        if (!Helper.ALLOW_SHIFT) return;
+        for (Crypto crypto : Crypto.values()) {
+            if (crypto == selectedCrypto) {
+                selectedCrypto(crypto);
+            } else if (possibleCryptos.contains(crypto)) {
+                possibleCrypto(crypto);
+            } else {
+                impossibleCrypto(crypto);
+            }
+        }
+        if ((selectedCrypto != null) && (selectedCrypto != Crypto.XMR)) {
+            tvXmrTo.setText(Html.fromHtml(getString(R.string.info_xmrto, selectedCrypto.getSymbol())));
+            tvXmrTo.setVisibility(View.VISIBLE);
+        } else if ((selectedCrypto == null) && (possibleCryptos.size() > 1)) {
+            tvXmrTo.setText(Html.fromHtml(getString(R.string.info_xmrto_ambiguous)));
+            tvXmrTo.setVisibility(View.VISIBLE);
+        } else {
+            tvXmrTo.setVisibility(View.INVISIBLE);
+        }
+        if (noAddress) {
+            selectedCrypto(Crypto.XMR);
+        }
+    }
+
+    private void processOpenAlias(String dnsOA) {
+        if (resolvingOA) return; // already resolving - just wait
+        sendListener.popBarcodeData();
+        if (dnsOA != null) {
+            resolvingOA = true;
+            etAddress.setError(getString(R.string.send_address_resolve_openalias));
+            OpenAliasHelper.resolve(dnsOA, new OpenAliasHelper.OnResolvedListener() {
+                @Override
+                public void onResolved(Map<Crypto, BarcodeData> dataMap) {
+                    resolvingOA = false;
+                    BarcodeData barcodeData = dataMap.get(Crypto.XMR);
+                    if (barcodeData == null) barcodeData = dataMap.get(Crypto.BTC);
+                    if (barcodeData != null) {
+                        Timber.d("Security=%s, %s", barcodeData.security.toString(), barcodeData.address);
+                        processScannedData(barcodeData);
+                    } else {
+                        etAddress.setError(getString(R.string.send_address_not_openalias));
+                        Timber.d("NO XMR OPENALIAS TXT FOUND");
+                    }
+                }
+
+                @Override
+                public void onFailure() {
+                    resolvingOA = false;
+                    etAddress.setError(getString(R.string.send_address_not_openalias));
+                    Timber.e("OA FAILED");
+                }
+            });
+        } // else ignore
+    }
+
+    private boolean checkAddressNoError() {
+        return selectedCrypto != null;
+    }
+
+    private boolean checkAddress() {
+        boolean ok = checkAddressNoError();
+        if (possibleCryptos.isEmpty()) {
+            etAddress.setError(getString(R.string.send_address_invalid));
+        } else {
+            etAddress.setError(null);
+        }
+        return ok;
+    }
+
+    private boolean isStandardAddress(String address) {
+        return Wallet.isAddressValid(address);
+    }
+
+    private boolean isIntegratedAddress(String address) {
+        return (address.length() == INTEGRATED_ADDRESS_LENGTH)
+                && Wallet.isAddressValid(address);
+    }
+
+    private boolean isBitcoinishAddress(String address) {
+        return BitcoinAddressValidator.validate(address, BitcoinAddressType.BTC)
+                ||
+                BitcoinAddressValidator.validate(address, BitcoinAddressType.LTC)
+                ||
+                BitcoinAddressValidator.validate(address, BitcoinAddressType.DASH);
+    }
+
+    private boolean isEthAddress(String address) {
+        return EthAddressValidator.validate(address);
+    }
+
+    private void shakeAddress() {
+        if (possibleCryptos.size() > 1) { // address ambiguous
+            for (Crypto crypto : Crypto.values()) {
+                if (possibleCryptos.contains(crypto)) {
+                    ibCrypto.get(crypto).startAnimation(Helper.getShakeAnimation(getContext()));
+                }
+            }
+        } else {
+            etAddress.startAnimation(Helper.getShakeAnimation(getContext()));
+        }
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        if (!checkAddressNoError()) {
+            shakeAddress();
+            String enteredAddress = etAddress.getEditText().getText().toString().trim();
+            String dnsOA = dnsFromOpenAlias(enteredAddress);
+            Timber.d("OpenAlias is %s", dnsOA);
+            if (dnsOA != null) {
+                processOpenAlias(dnsOA);
+            }
+            return false;
+        }
+
+        if (sendListener != null) {
+            TxData txData = sendListener.getTxData();
+            if (txData instanceof TxDataBtc) {
+                ((TxDataBtc) txData).setBtcAddress(etAddress.getEditText().getText().toString());
+                ((TxDataBtc) txData).setBtcSymbol(selectedCrypto.getSymbol());
+                txData.setDestinationAddress(null);
+                ServiceHelper.ASSET = selectedCrypto.getSymbol().toLowerCase();
+            } else {
+                txData.setDestinationAddress(etAddress.getEditText().getText().toString());
+                ServiceHelper.ASSET = null;
+            }
+            txData.setUserNotes(new UserNotes(etNotes.getEditText().getText().toString()));
+            txData.setPriority(PendingTransaction.Priority.Priority_Default);
+            txData.setMixin(SendFragment.MIXIN);
+        }
+        return true;
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        super.onAttach(context);
+        if (context instanceof OnScanListener) {
+            onScanListener = (OnScanListener) context;
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement ScanListener");
+        }
+    }
+
+    // QR Scan Stuff
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume");
+        processScannedData();
+    }
+
+    public void processScannedData(BarcodeData barcodeData) {
+        sendListener.setBarcodeData(barcodeData);
+        if (isResumed())
+            processScannedData();
+    }
+
+    public void processScannedData() {
+        BarcodeData barcodeData = sendListener.getBarcodeData();
+        if (barcodeData != null) {
+            Timber.d("GOT DATA");
+            if (!Helper.ALLOW_SHIFT && (barcodeData.asset != Crypto.XMR)) {
+                Timber.d("BUT ONLY XMR SUPPORTED");
+                barcodeData = null;
+                sendListener.setBarcodeData(barcodeData);
+                return;
+            }
+            if (barcodeData.address != null) {
+                etAddress.getEditText().setText(barcodeData.address);
+                possibleCryptos.clear();
+                selectedCrypto = null;
+                if (barcodeData.isAmbiguous()) {
+                    possibleCryptos.addAll(barcodeData.ambiguousAssets);
+                } else {
+                    possibleCryptos.add(barcodeData.asset);
+                    selectedCrypto = barcodeData.asset;
+                }
+                if (Helper.ALLOW_SHIFT)
+                    updateCryptoButtons(false);
+                if (checkAddress()) {
+                    if (barcodeData.security == BarcodeData.Security.OA_NO_DNSSEC)
+                        etAddress.setError(getString(R.string.send_address_no_dnssec));
+                    else if (barcodeData.security == BarcodeData.Security.OA_DNSSEC)
+                        etAddress.setError(getString(R.string.send_address_openalias));
+                }
+            } else {
+                etAddress.getEditText().getText().clear();
+                etAddress.setError(null);
+            }
+
+            String scannedNotes = barcodeData.addressName;
+            if (scannedNotes == null) {
+                scannedNotes = barcodeData.description;
+            } else if (barcodeData.description != null) {
+                scannedNotes = scannedNotes + ": " + barcodeData.description;
+            }
+            if (scannedNotes != null) {
+                etNotes.getEditText().setText(scannedNotes);
+            } else {
+                etNotes.getEditText().getText().clear();
+                etNotes.setError(null);
+            }
+        } else
+            Timber.d("barcodeData=null");
+    }
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        etDummy.requestFocus();
+    }
+
+    String dnsFromOpenAlias(String openalias) {
+        Timber.d("checking openalias candidate %s", openalias);
+        if (Patterns.DOMAIN_NAME.matcher(openalias).matches()) return openalias;
+        if (Patterns.EMAIL_ADDRESS.matcher(openalias).matches()) {
+            openalias = openalias.replaceFirst("@", ".");
+            if (Patterns.DOMAIN_NAME.matcher(openalias).matches()) return openalias;
+        }
+        return null; // not an openalias
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendAmountWizardFragment.java

@@ -0,0 +1,159 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.TextView;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.BarcodeData;
+import com.m2049r.xmrwallet.data.TxData;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.widget.ExchangeEditText;
+
+import timber.log.Timber;
+
+public class SendAmountWizardFragment extends SendWizardFragment {
+
+    public static SendAmountWizardFragment newInstance(Listener listener) {
+        SendAmountWizardFragment instance = new SendAmountWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    Listener sendListener;
+
+    public void setSendListener(Listener listener) {
+        this.sendListener = listener;
+    }
+
+    interface Listener {
+        SendFragment.Listener getActivityCallback();
+
+        TxData getTxData();
+
+        BarcodeData popBarcodeData();
+    }
+
+    private TextView tvFunds;
+    private ExchangeEditText etAmount;
+    private View rlSweep;
+    private ImageButton ibSweep;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Timber.d("onCreateView() %s", (String.valueOf(savedInstanceState)));
+
+        sendListener = (Listener) getParentFragment();
+
+        View view = inflater.inflate(R.layout.fragment_send_amount, container, false);
+
+        tvFunds = view.findViewById(R.id.tvFunds);
+        etAmount = view.findViewById(R.id.etAmount);
+        rlSweep = view.findViewById(R.id.rlSweep);
+
+        view.findViewById(R.id.ivSweep).setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                sweepAll(false);
+            }
+        });
+
+        ibSweep = view.findViewById(R.id.ibSweep);
+
+        ibSweep.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                sweepAll(true);
+            }
+        });
+
+        etAmount.requestFocus();
+        return view;
+    }
+
+    private boolean spendAllMode = false;
+
+    private void sweepAll(boolean spendAllMode) {
+        if (spendAllMode) {
+            ibSweep.setVisibility(View.INVISIBLE);
+            etAmount.setVisibility(View.GONE);
+            rlSweep.setVisibility(View.VISIBLE);
+        } else {
+            ibSweep.setVisibility(View.VISIBLE);
+            etAmount.setVisibility(View.VISIBLE);
+            rlSweep.setVisibility(View.GONE);
+        }
+        this.spendAllMode = spendAllMode;
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        if (spendAllMode) {
+            if (sendListener != null) {
+                sendListener.getTxData().setAmount(Wallet.SWEEP_ALL);
+            }
+        } else {
+            if (!etAmount.validate(maxFunds, 0)) {
+                return false;
+            }
+
+            if (sendListener != null) {
+                String xmr = etAmount.getNativeAmount();
+                if (xmr != null) {
+                    sendListener.getTxData().setAmount(Wallet.getAmountFromString(xmr));
+                } else {
+                    sendListener.getTxData().setAmount(0L);
+                }
+            }
+        }
+        return true;
+    }
+
+    double maxFunds = 0;
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        Helper.showKeyboard(getActivity());
+        final long funds = getTotalFunds();
+        maxFunds = 1.0 * funds / Helper.ONE_XMR;
+        if (!sendListener.getActivityCallback().isStreetMode()) {
+            tvFunds.setText(getString(R.string.send_available,
+                    Wallet.getDisplayAmount(funds)));
+        } else {
+            tvFunds.setText(getString(R.string.send_available,
+                    getString(R.string.unknown_amount)));
+        }
+        final BarcodeData data = sendListener.popBarcodeData();
+        if ((data != null) && (data.amount != null)) {
+            etAmount.setAmount(data.amount);
+        }
+    }
+
+    long getTotalFunds() {
+        return sendListener.getActivityCallback().getTotalFunds();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendBtcAmountWizardFragment.java

@@ -0,0 +1,263 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.os.Bundle;
+import android.text.Html;
+import android.text.Spanned;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.BarcodeData;
+import com.m2049r.xmrwallet.data.TxDataBtc;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.service.shift.ShiftCallback;
+import com.m2049r.xmrwallet.service.shift.ShiftError;
+import com.m2049r.xmrwallet.service.shift.ShiftException;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.QueryOrderParameters;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.SideShiftApi;
+import com.m2049r.xmrwallet.service.shift.sideshift.network.SideShiftApiImpl;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
+import com.m2049r.xmrwallet.widget.ExchangeOtherEditText;
+import com.m2049r.xmrwallet.widget.SendProgressView;
+
+import java.text.NumberFormat;
+import java.util.Locale;
+
+import timber.log.Timber;
+
+public class SendBtcAmountWizardFragment extends SendWizardFragment {
+
+    public static SendBtcAmountWizardFragment newInstance(SendAmountWizardFragment.Listener listener) {
+        SendBtcAmountWizardFragment instance = new SendBtcAmountWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    SendAmountWizardFragment.Listener sendListener;
+
+    public SendBtcAmountWizardFragment setSendListener(SendAmountWizardFragment.Listener listener) {
+        this.sendListener = listener;
+        return this;
+    }
+
+    private TextView tvFunds;
+    private ExchangeOtherEditText etAmount;
+
+    private TextView tvXmrToParms;
+    private SendProgressView evParams;
+    private View llXmrToParms;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Timber.d("onCreateView() %s", (String.valueOf(savedInstanceState)));
+
+        sendListener = (SendAmountWizardFragment.Listener) getParentFragment();
+
+        View view = inflater.inflate(R.layout.fragment_send_btc_amount, container, false);
+
+        tvFunds = view.findViewById(R.id.tvFunds);
+
+        evParams = view.findViewById(R.id.evXmrToParms);
+        llXmrToParms = view.findViewById(R.id.llXmrToParms);
+
+        tvXmrToParms = view.findViewById(R.id.tvXmrToParms);
+
+        etAmount = view.findViewById(R.id.etAmount);
+        etAmount.requestFocus();
+
+        return view;
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        Timber.i(maxBtc + "/" + minBtc);
+        if (!etAmount.validate(maxBtc, minBtc)) {
+            return false;
+        }
+        if (orderParameters == null) {
+            return false; // this should never happen
+        }
+        if (sendListener != null) {
+            TxDataBtc txDataBtc = (TxDataBtc) sendListener.getTxData();
+            String btcString = etAmount.getNativeAmount();
+            if (btcString != null) {
+                try {
+                    double btc = Double.parseDouble(btcString);
+                    Timber.d("setBtcAmount %f", btc);
+                    txDataBtc.setBtcAmount(btc);
+                    txDataBtc.setAmount(btc / orderParameters.getPrice());
+                } catch (NumberFormatException ex) {
+                    Timber.d(ex.getLocalizedMessage());
+                    txDataBtc.setBtcAmount(0);
+                }
+            } else {
+                txDataBtc.setBtcAmount(0);
+            }
+        }
+        return true;
+    }
+
+    double maxBtc = 0;
+    double minBtc = 0;
+
+    @Override
+    public void onPauseFragment() {
+        llXmrToParms.setVisibility(View.INVISIBLE);
+    }
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        final String btcSymbol = ((TxDataBtc) sendListener.getTxData()).getBtcSymbol();
+        if (!btcSymbol.toLowerCase().equals(ServiceHelper.ASSET))
+            throw new IllegalStateException("Asset Symbol is wrong!");
+        final long funds = getTotalFunds();
+        if (!sendListener.getActivityCallback().isStreetMode()) {
+            tvFunds.setText(getString(R.string.send_available,
+                    Wallet.getDisplayAmount(funds)));
+            //TODO
+        } else {
+            tvFunds.setText(getString(R.string.send_available,
+                    getString(R.string.unknown_amount)));
+        }
+        etAmount.setAmount("");
+        final BarcodeData data = sendListener.popBarcodeData();
+        if (data != null) {
+            if (data.amount != null) {
+                etAmount.setAmount(data.amount);
+            }
+        }
+        etAmount.setBaseCurrency(btcSymbol);
+        callXmrTo();
+    }
+
+    long getTotalFunds() {
+        return sendListener.getActivityCallback().getTotalFunds();
+    }
+
+    private QueryOrderParameters orderParameters = null;
+
+    private void processOrderParms(final QueryOrderParameters orderParameters) {
+        this.orderParameters = orderParameters;
+        getView().post(() -> {
+            final double price = orderParameters.getPrice();
+            etAmount.setExchangeRate(1 / price);
+            maxBtc = price * orderParameters.getUpperLimit();
+            minBtc = price * orderParameters.getLowerLimit();
+            Timber.d("minBtc=%f / maxBtc=%f", minBtc, maxBtc);
+            NumberFormat df = NumberFormat.getInstance(Locale.US);
+            df.setMaximumFractionDigits(6);
+            String min = df.format(minBtc);
+            String max = df.format(maxBtc);
+            String rate = df.format(price);
+            final TxDataBtc txDataBtc = (TxDataBtc) sendListener.getTxData();
+            Spanned xmrParmText = Html.fromHtml(getString(R.string.info_send_xmrto_parms,
+                    min, max, rate, txDataBtc.getBtcSymbol()));
+            tvXmrToParms.setText(xmrParmText);
+
+            final long funds = getTotalFunds();
+            double availableXmr = 1.0 * funds / Helper.ONE_XMR;
+
+            String availBtcString;
+            String availXmrString;
+            if (!sendListener.getActivityCallback().isStreetMode()) {
+                availBtcString = df.format(availableXmr * price);
+                availXmrString = df.format(availableXmr);
+            } else {
+                availBtcString = getString(R.string.unknown_amount);
+                availXmrString = availBtcString;
+            }
+            tvFunds.setText(getString(R.string.send_available_btc,
+                    availXmrString,
+                    availBtcString,
+                    ((TxDataBtc) sendListener.getTxData()).getBtcSymbol()));
+            llXmrToParms.setVisibility(View.VISIBLE);
+            evParams.hideProgress();
+        });
+    }
+
+    private void processOrderParmsError(final Exception ex) {
+        etAmount.setExchangeRate(0);
+        orderParameters = null;
+        maxBtc = 0;
+        minBtc = 0;
+        Timber.e(ex);
+        getView().post(() -> {
+            if (ex instanceof ShiftException) {
+                ShiftException xmrEx = (ShiftException) ex;
+                ShiftError xmrErr = xmrEx.getError();
+                if (xmrErr != null) {
+                    if (xmrErr.isRetryable()) {
+                        evParams.showMessage(xmrErr.getErrorType().toString(), xmrErr.getErrorMsg(),
+                                getString(R.string.text_retry));
+                        evParams.setOnClickListener(v -> {
+                            evParams.setOnClickListener(null);
+                            callXmrTo();
+                        });
+                    } else {
+                        evParams.showMessage(xmrErr.getErrorType().toString(), xmrErr.getErrorMsg(),
+                                getString(R.string.text_noretry));
+                    }
+                } else {
+                    evParams.showMessage(getString(R.string.label_generic_xmrto_error),
+                            getString(R.string.text_generic_xmrto_error, xmrEx.getCode()),
+                            getString(R.string.text_noretry));
+                }
+            } else {
+                evParams.showMessage(getString(R.string.label_generic_xmrto_error),
+                        ex.getLocalizedMessage(),
+                        getString(R.string.text_noretry));
+            }
+        });
+    }
+
+    private void callXmrTo() {
+        evParams.showProgress(getString(R.string.label_send_progress_queryparms));
+        getXmrToApi().queryOrderParameters(new ShiftCallback<QueryOrderParameters>() {
+            @Override
+            public void onSuccess(final QueryOrderParameters orderParameters) {
+                processOrderParms(orderParameters);
+            }
+
+            @Override
+            public void onError(final Exception e) {
+                processOrderParmsError(e);
+            }
+        });
+    }
+
+    private SideShiftApi xmrToApi = null;
+
+    private SideShiftApi getXmrToApi() {
+        if (xmrToApi == null) {
+            synchronized (this) {
+                if (xmrToApi == null) {
+                    xmrToApi = new SideShiftApiImpl(ServiceHelper.getXmrToBaseUrl());
+                }
+            }
+        }
+        return xmrToApi;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendBtcConfirmWizardFragment.java

@@ -0,0 +1,551 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.TxData;
+import com.m2049r.xmrwallet.data.TxDataBtc;
+import com.m2049r.xmrwallet.model.PendingTransaction;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.service.shift.ShiftCallback;
+import com.m2049r.xmrwallet.service.shift.ShiftError;
+import com.m2049r.xmrwallet.service.shift.ShiftException;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.CreateOrder;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.RequestQuote;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.SideShiftApi;
+import com.m2049r.xmrwallet.service.shift.sideshift.network.SideShiftApiImpl;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
+import com.m2049r.xmrwallet.widget.SendProgressView;
+
+import java.text.NumberFormat;
+import java.util.Locale;
+
+import timber.log.Timber;
+
+public class SendBtcConfirmWizardFragment extends SendWizardFragment implements SendConfirm {
+    public static SendBtcConfirmWizardFragment newInstance(SendConfirmWizardFragment.Listener listener) {
+        SendBtcConfirmWizardFragment instance = new SendBtcConfirmWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    SendConfirmWizardFragment.Listener sendListener;
+
+    public void setSendListener(SendConfirmWizardFragment.Listener listener) {
+        this.sendListener = listener;
+    }
+
+    private View llStageA;
+    private SendProgressView evStageA;
+    private View llStageB;
+    private SendProgressView evStageB;
+    private View llStageC;
+    private SendProgressView evStageC;
+    private TextView tvTxBtcAmount;
+    private TextView tvTxBtcRate;
+    private TextView tvTxBtcAddress;
+    private TextView tvTxBtcAddressLabel;
+    private TextView tvTxXmrToKey;
+    private TextView tvTxFee;
+    private TextView tvTxTotal;
+    private View llConfirmSend;
+    private Button bSend;
+    private View pbProgressSend;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Timber.d("onCreateView(%s)", (String.valueOf(savedInstanceState)));
+
+        View view = inflater.inflate(
+                R.layout.fragment_send_btc_confirm, container, false);
+
+        tvTxBtcAddress = view.findViewById(R.id.tvTxBtcAddress);
+        tvTxBtcAddressLabel = view.findViewById(R.id.tvTxBtcAddressLabel);
+        tvTxBtcAmount = view.findViewById(R.id.tvTxBtcAmount);
+        tvTxBtcRate = view.findViewById(R.id.tvTxBtcRate);
+        tvTxXmrToKey = view.findViewById(R.id.tvTxXmrToKey);
+
+        tvTxFee = view.findViewById(R.id.tvTxFee);
+        tvTxTotal = view.findViewById(R.id.tvTxTotal);
+
+        llStageA = view.findViewById(R.id.llStageA);
+        evStageA = view.findViewById(R.id.evStageA);
+        llStageB = view.findViewById(R.id.llStageB);
+        evStageB = view.findViewById(R.id.evStageB);
+        llStageC = view.findViewById(R.id.llStageC);
+        evStageC = view.findViewById(R.id.evStageC);
+
+        tvTxXmrToKey.setOnClickListener(v -> {
+            Helper.clipBoardCopy(getActivity(), getString(R.string.label_copy_xmrtokey), tvTxXmrToKey.getText().toString());
+            Toast.makeText(getActivity(), getString(R.string.message_copy_xmrtokey), Toast.LENGTH_SHORT).show();
+        });
+
+        llConfirmSend = view.findViewById(R.id.llConfirmSend);
+        pbProgressSend = view.findViewById(R.id.pbProgressSend);
+
+        bSend = view.findViewById(R.id.bSend);
+        bSend.setEnabled(false);
+
+        bSend.setOnClickListener(v -> {
+            Timber.d("bSend.setOnClickListener");
+            bSend.setEnabled(false);
+            preSend();
+        });
+
+        return view;
+    }
+
+    int inProgress = 0;
+    final static int STAGE_X = 0;
+    final static int STAGE_A = 1;
+    final static int STAGE_B = 2;
+    final static int STAGE_C = 3;
+
+    private void showProgress(int stage, String progressText) {
+        Timber.d("showProgress(%d)", stage);
+        inProgress = stage;
+        switch (stage) {
+            case STAGE_A:
+                evStageA.showProgress(progressText);
+                break;
+            case STAGE_B:
+                evStageB.showProgress(progressText);
+                break;
+            case STAGE_C:
+                evStageC.showProgress(progressText);
+                break;
+            default:
+                throw new IllegalStateException("unknown stage " + stage);
+        }
+    }
+
+    public void hideProgress() {
+        Timber.d("hideProgress(%d)", inProgress);
+        switch (inProgress) {
+            case STAGE_A:
+                evStageA.hideProgress();
+                llStageA.setVisibility(View.VISIBLE);
+                break;
+            case STAGE_B:
+                evStageB.hideProgress();
+                llStageB.setVisibility(View.VISIBLE);
+                break;
+            case STAGE_C:
+                evStageC.hideProgress();
+                llStageC.setVisibility(View.VISIBLE);
+                break;
+            default:
+                throw new IllegalStateException("unknown stage " + inProgress);
+        }
+        inProgress = STAGE_X;
+    }
+
+    public void showStageError(String code, String message, String solution) {
+        switch (inProgress) {
+            case STAGE_A:
+                evStageA.showMessage(code, message, solution);
+                break;
+            case STAGE_B:
+                evStageB.showMessage(code, message, solution);
+                break;
+            case STAGE_C:
+                evStageC.showMessage(code, message, solution);
+                break;
+            default:
+                throw new IllegalStateException("unknown stage");
+        }
+        inProgress = STAGE_X;
+    }
+
+    PendingTransaction pendingTransaction = null;
+
+    void send() {
+        Timber.d("SEND @%d", sendCountdown);
+        if (sendCountdown <= 0) {
+            Timber.i("User waited too long in password dialog.");
+            Toast.makeText(getContext(), getString(R.string.send_xmrto_timeout), Toast.LENGTH_SHORT).show();
+            return;
+        }
+        sendListener.getTxData().getUserNotes().setXmrtoOrder(xmrtoOrder); // note the transaction in the TX notes
+        ((TxDataBtc) sendListener.getTxData()).setXmrtoOrderId(xmrtoOrder.getOrderId()); // remember the order id for later
+        // TODO make method in TxDataBtc to set both of the above in one go
+        sendListener.commitTransaction();
+        getActivity().runOnUiThread(() -> pbProgressSend.setVisibility(View.VISIBLE));
+    }
+
+    @Override
+    public void sendFailed(String error) {
+        pbProgressSend.setVisibility(View.INVISIBLE);
+        Toast.makeText(getContext(), getString(R.string.status_transaction_failed, error), Toast.LENGTH_LONG).show();
+    }
+
+    @Override
+    // callback from wallet when PendingTransaction created (started by prepareSend() here
+    public void transactionCreated(final String txTag, final PendingTransaction pendingTransaction) {
+        if (isResumed
+                && (inProgress == STAGE_C)
+                && (xmrtoOrder != null)
+                && (xmrtoOrder.getOrderId().equals(txTag))) {
+            this.pendingTransaction = pendingTransaction;
+            getView().post(() -> {
+                hideProgress();
+                tvTxFee.setText(Wallet.getDisplayAmount(pendingTransaction.getFee()));
+                tvTxTotal.setText(Wallet.getDisplayAmount(
+                        pendingTransaction.getFee() + pendingTransaction.getAmount()));
+                updateSendButton();
+            });
+        } else {
+            this.pendingTransaction = null;
+            sendListener.disposeTransaction();
+        }
+    }
+
+    @Override
+    public void createTransactionFailed(String errorText) {
+        Timber.e("CREATE TX FAILED");
+        if (pendingTransaction != null) {
+            throw new IllegalStateException("pendingTransaction is not null");
+        }
+        showStageError(getString(R.string.send_create_tx_error_title),
+                errorText,
+                getString(R.string.text_noretry_monero));
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        return true;
+    }
+
+    private boolean isResumed = false;
+
+    @Override
+    public void onPauseFragment() {
+        isResumed = false;
+        stopSendTimer();
+        sendListener.disposeTransaction();
+        pendingTransaction = null;
+        inProgress = STAGE_X;
+        updateSendButton();
+        super.onPauseFragment();
+    }
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        if (sendListener.getMode() != SendFragment.Mode.BTC) {
+            throw new IllegalStateException("Mode is not BTC!");
+        }
+        if (!((TxDataBtc) sendListener.getTxData()).getBtcSymbol().toLowerCase().equals(ServiceHelper.ASSET))
+            throw new IllegalStateException("Asset Symbol is wrong!");
+        Helper.hideKeyboard(getActivity());
+        llStageA.setVisibility(View.INVISIBLE);
+        evStageA.hideProgress();
+        llStageB.setVisibility(View.INVISIBLE);
+        evStageB.hideProgress();
+        llStageC.setVisibility(View.INVISIBLE);
+        evStageC.hideProgress();
+        isResumed = true;
+        if ((pendingTransaction == null) && (inProgress == STAGE_X)) {
+            stageA();
+        } // otherwise just sit there blank
+        // TODO: don't sit there blank - can this happen? should we just die?
+    }
+
+    private int sendCountdown = 0;
+    private static final int XMRTO_COUNTDOWN_STEP = 1; // 1 second
+
+    Runnable updateRunnable = null;
+
+    void startSendTimer(int timeout) {
+        Timber.d("startSendTimer()");
+        sendCountdown = timeout;
+        updateRunnable = new Runnable() {
+            @Override
+            public void run() {
+                if (!isAdded())
+                    return;
+                Timber.d("updateTimer()");
+                if (sendCountdown <= 0) {
+                    bSend.setEnabled(false);
+                    sendCountdown = 0;
+                    Toast.makeText(getContext(), getString(R.string.send_xmrto_timeout), Toast.LENGTH_SHORT).show();
+                }
+                int minutes = sendCountdown / 60;
+                int seconds = sendCountdown % 60;
+                String t = String.format("%d:%02d", minutes, seconds);
+                bSend.setText(getString(R.string.send_send_timed_label, t));
+                if (sendCountdown > 0) {
+                    sendCountdown -= XMRTO_COUNTDOWN_STEP;
+                    getView().postDelayed(this, XMRTO_COUNTDOWN_STEP * 1000);
+                }
+            }
+        };
+        getView().post(updateRunnable);
+    }
+
+    void stopSendTimer() {
+        getView().removeCallbacks(updateRunnable);
+    }
+
+    void updateSendButton() {
+        Timber.d("updateSendButton()");
+        if (pendingTransaction != null) {
+            llConfirmSend.setVisibility(View.VISIBLE);
+            bSend.setEnabled(sendCountdown > 0);
+        } else {
+            llConfirmSend.setVisibility(View.GONE);
+            bSend.setEnabled(false);
+        }
+    }
+
+    public void preSend() {
+        Helper.promptPassword(getContext(), getActivityCallback().getWalletName(), false, new Helper.PasswordAction() {
+            @Override
+            public void act(String walletName, String password, boolean fingerprintUsed) {
+                send();
+            }
+
+            public void fail(String walletName) {
+                getActivity().runOnUiThread(() -> {
+                    bSend.setEnabled(sendCountdown > 0); // allow to try again
+                });
+            }
+        });
+    }
+
+    // creates a pending transaction and calls us back with transactionCreated()
+    // or createTransactionFailed()
+    void prepareSend() {
+        if (!isResumed) return;
+        if ((xmrtoOrder == null)) {
+            throw new IllegalStateException("xmrtoOrder is null");
+        }
+        showProgress(3, getString(R.string.label_send_progress_create_tx));
+        final TxData txData = sendListener.getTxData();
+        txData.setDestinationAddress(xmrtoOrder.getXmrAddress());
+        txData.setAmount(xmrtoOrder.getXmrAmount());
+        getActivityCallback().onPrepareSend(xmrtoOrder.getOrderId(), txData);
+    }
+
+    SendFragment.Listener getActivityCallback() {
+        return sendListener.getActivityCallback();
+    }
+
+    private RequestQuote xmrtoQuote = null;
+
+    private void processStageA(final RequestQuote requestQuote) {
+        Timber.d("processCreateOrder %s", requestQuote.getId());
+        TxDataBtc txDataBtc = (TxDataBtc) sendListener.getTxData();
+        // verify the BTC amount is correct
+        if (requestQuote.getBtcAmount() != txDataBtc.getBtcAmount()) {
+            Timber.d("Failed to get quote");
+            getView().post(() -> showStageError(ShiftError.Error.SERVICE.toString(),
+                    getString(R.string.shift_noquote),
+                    getString(R.string.shift_checkamount)));
+            return; // just stop for now
+        }
+        xmrtoQuote = requestQuote;
+        txDataBtc.setAmount(xmrtoQuote.getXmrAmount());
+        getView().post(() -> {
+            // show data from the actual quote as that is what is used to
+            NumberFormat df = NumberFormat.getInstance(Locale.US);
+            df.setMaximumFractionDigits(12);
+            final String btcAmount = df.format(xmrtoQuote.getBtcAmount());
+            final String xmrAmountTotal = df.format(xmrtoQuote.getXmrAmount());
+            tvTxBtcAmount.setText(getString(R.string.text_send_btc_amount,
+                    btcAmount, xmrAmountTotal, txDataBtc.getBtcSymbol()));
+            final String xmrPriceBtc = df.format(xmrtoQuote.getPrice());
+            tvTxBtcRate.setText(getString(R.string.text_send_btc_rate, xmrPriceBtc, txDataBtc.getBtcSymbol()));
+            hideProgress();
+        });
+        stageB(requestQuote.getId());
+    }
+
+    private void processStageAError(final Exception ex) {
+        Timber.e("processStageAError %s", ex.getLocalizedMessage());
+        getView().post(() -> {
+            if (ex instanceof ShiftException) {
+                ShiftException xmrEx = (ShiftException) ex;
+                ShiftError xmrErr = xmrEx.getError();
+                if (xmrErr != null) {
+                    if (xmrErr.isRetryable()) {
+                        showStageError(xmrErr.getErrorType().toString(), xmrErr.getErrorMsg(),
+                                getString(R.string.text_retry));
+                        evStageA.setOnClickListener(v -> {
+                            evStageA.setOnClickListener(null);
+                            stageA();
+                        });
+                    } else {
+                        showStageError(xmrErr.getErrorType().toString(), xmrErr.getErrorMsg(),
+                                getString(R.string.text_noretry));
+                    }
+                } else {
+                    showStageError(getString(R.string.label_generic_xmrto_error),
+                            getString(R.string.text_generic_xmrto_error, xmrEx.getCode()),
+                            getString(R.string.text_noretry));
+                }
+            } else {
+                evStageA.showMessage(getString(R.string.label_generic_xmrto_error),
+                        ex.getLocalizedMessage(),
+                        getString(R.string.text_noretry));
+            }
+        });
+    }
+
+    private void stageA() {
+        if (!isResumed) return;
+        Timber.d("Request Quote");
+        xmrtoQuote = null;
+        xmrtoOrder = null;
+        showProgress(1, getString(R.string.label_send_progress_xmrto_create));
+        TxDataBtc txDataBtc = (TxDataBtc) sendListener.getTxData();
+
+        ShiftCallback<RequestQuote> callback = new ShiftCallback<RequestQuote>() {
+            @Override
+            public void onSuccess(RequestQuote requestQuote) {
+                if (!isResumed) return;
+                if (xmrtoQuote != null) {
+                    Timber.w("another ongoing request quote request");
+                    return;
+                }
+                processStageA(requestQuote);
+            }
+
+            @Override
+            public void onError(Exception ex) {
+                if (!isResumed) return;
+                if (xmrtoQuote != null) {
+                    Timber.w("another ongoing request quote request");
+                    return;
+                }
+                processStageAError(ex);
+            }
+        };
+
+        getXmrToApi().requestQuote(txDataBtc.getBtcAmount(), callback);
+    }
+
+    private CreateOrder xmrtoOrder = null;
+
+    private void processStageB(final CreateOrder order) {
+        Timber.d("processCreateOrder %s for %s", order.getOrderId(), order.getQuoteId());
+        TxDataBtc txDataBtc = (TxDataBtc) sendListener.getTxData();
+        // verify amount & destination
+        if ((order.getBtcAmount() != txDataBtc.getBtcAmount())
+                || (!txDataBtc.validateAddress(order.getBtcAddress()))) {
+            throw new IllegalStateException("Order does not fulfill quote!"); // something is terribly wrong - die
+        }
+        xmrtoOrder = order;
+        getView().post(() -> {
+            tvTxXmrToKey.setText(order.getOrderId());
+            tvTxBtcAddress.setText(order.getBtcAddress());
+            tvTxBtcAddressLabel.setText(getString(R.string.label_send_btc_address, txDataBtc.getBtcSymbol()));
+            hideProgress();
+            Timber.d("Expires @ %s", order.getExpiresAt().toString());
+            final int timeout = (int) (order.getExpiresAt().getTime() - order.getCreatedAt().getTime()) / 1000 - 60; // -1 minute buffer
+            startSendTimer(timeout);
+            prepareSend();
+        });
+    }
+
+    private void processStageBError(final Exception ex) {
+        Timber.e("processCreateOrderError %s", ex.getLocalizedMessage());
+        getView().post(() -> {
+            if (ex instanceof ShiftException) {
+                ShiftException xmrEx = (ShiftException) ex;
+                ShiftError xmrErr = xmrEx.getError();
+                if (xmrErr != null) {
+                    if (xmrErr.isRetryable()) {
+                        showStageError(xmrErr.getErrorType().toString(), xmrErr.getErrorMsg(),
+                                getString(R.string.text_retry));
+                        evStageB.setOnClickListener(v -> {
+                            evStageB.setOnClickListener(null);
+                            stageB(xmrtoOrder.getOrderId());
+                        });
+                    } else {
+                        showStageError(xmrErr.getErrorType().toString(), xmrErr.getErrorMsg(),
+                                getString(R.string.text_noretry));
+                    }
+                } else {
+                    showStageError(getString(R.string.label_generic_xmrto_error),
+                            getString(R.string.text_generic_xmrto_error, xmrEx.getCode()),
+                            getString(R.string.text_noretry));
+                }
+            } else {
+                evStageB.showMessage(getString(R.string.label_generic_xmrto_error),
+                        ex.getLocalizedMessage(),
+                        getString(R.string.text_noretry));
+            }
+        });
+    }
+
+    private void stageB(final String quoteId) {
+        Timber.d("createOrder(%s)", quoteId);
+        if (!isResumed) return;
+        final String btcAddress = ((TxDataBtc) sendListener.getTxData()).getBtcAddress();
+        getView().post(() -> {
+            xmrtoOrder = null;
+            showProgress(2, getString(R.string.label_send_progress_xmrto_query));
+            getXmrToApi().createOrder(quoteId, btcAddress, new ShiftCallback<CreateOrder>() {
+                @Override
+                public void onSuccess(CreateOrder order) {
+                    if (!isResumed) return;
+                    if (xmrtoQuote == null) return;
+                    if (!order.getQuoteId().equals(xmrtoQuote.getId())) {
+                        Timber.d("Quote ID does not match");
+                        // ignore (we got a response to a stale request)
+                        return;
+                    }
+                    if (xmrtoOrder != null)
+                        throw new IllegalStateException("xmrtoOrder must be null here!");
+                    processStageB(order);
+                }
+
+                @Override
+                public void onError(Exception ex) {
+                    if (!isResumed) return;
+                    processStageBError(ex);
+                }
+            });
+        });
+    }
+
+    private SideShiftApi xmrToApi = null;
+
+    private SideShiftApi getXmrToApi() {
+        if (xmrToApi == null) {
+            synchronized (this) {
+                if (xmrToApi == null) {
+                    xmrToApi = new SideShiftApiImpl(ServiceHelper.getXmrToBaseUrl());
+                }
+            }
+        }
+        return xmrToApi;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendBtcSuccessWizardFragment.java

@@ -0,0 +1,262 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.content.Intent;
+import android.graphics.Paint;
+import android.net.Uri;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.Crypto;
+import com.m2049r.xmrwallet.data.PendingTx;
+import com.m2049r.xmrwallet.data.TxDataBtc;
+import com.m2049r.xmrwallet.service.shift.ShiftCallback;
+import com.m2049r.xmrwallet.service.shift.ShiftException;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.QueryOrderStatus;
+import com.m2049r.xmrwallet.service.shift.sideshift.api.SideShiftApi;
+import com.m2049r.xmrwallet.service.shift.sideshift.network.SideShiftApiImpl;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ServiceHelper;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+
+import java.text.NumberFormat;
+import java.util.Locale;
+
+import timber.log.Timber;
+
+public class SendBtcSuccessWizardFragment extends SendWizardFragment {
+
+    public static SendBtcSuccessWizardFragment newInstance(SendSuccessWizardFragment.Listener listener) {
+        SendBtcSuccessWizardFragment instance = new SendBtcSuccessWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    SendSuccessWizardFragment.Listener sendListener;
+
+    public void setSendListener(SendSuccessWizardFragment.Listener listener) {
+        this.sendListener = listener;
+    }
+
+    ImageButton bCopyTxId;
+    private TextView tvTxId;
+    private TextView tvTxAddress;
+    private TextView tvTxAmount;
+    private TextView tvTxFee;
+    private TextView tvXmrToAmount;
+    private ImageView ivXmrToIcon;
+    private TextView tvXmrToStatus;
+    private ImageView ivXmrToStatus;
+    private ImageView ivXmrToStatusBig;
+    private ProgressBar pbXmrto;
+    private TextView tvTxXmrToKey;
+    private TextView tvXmrToSupport;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Timber.d("onCreateView() %s", (String.valueOf(savedInstanceState)));
+
+        View view = inflater.inflate(
+                R.layout.fragment_send_btc_success, container, false);
+
+        bCopyTxId = view.findViewById(R.id.bCopyTxId);
+        bCopyTxId.setEnabled(false);
+        bCopyTxId.setOnClickListener(v -> {
+            Helper.clipBoardCopy(getActivity(), getString(R.string.label_send_txid), tvTxId.getText().toString());
+            Toast.makeText(getActivity(), getString(R.string.message_copy_txid), Toast.LENGTH_SHORT).show();
+        });
+
+        tvXmrToAmount = view.findViewById(R.id.tvXmrToAmount);
+        ivXmrToIcon = view.findViewById(R.id.ivXmrToIcon);
+        tvXmrToStatus = view.findViewById(R.id.tvXmrToStatus);
+        ivXmrToStatus = view.findViewById(R.id.ivXmrToStatus);
+        ivXmrToStatusBig = view.findViewById(R.id.ivXmrToStatusBig);
+
+        tvTxId = view.findViewById(R.id.tvTxId);
+        tvTxAddress = view.findViewById(R.id.tvTxAddress);
+        tvTxAmount = view.findViewById(R.id.tvTxAmount);
+        tvTxFee = view.findViewById(R.id.tvTxFee);
+
+        pbXmrto = view.findViewById(R.id.pbXmrto);
+        pbXmrto.getIndeterminateDrawable().setColorFilter(0x61000000, android.graphics.PorterDuff.Mode.MULTIPLY);
+
+        tvTxXmrToKey = view.findViewById(R.id.tvTxXmrToKey);
+        tvTxXmrToKey.setOnClickListener(v -> {
+            Helper.clipBoardCopy(getActivity(), getString(R.string.label_copy_xmrtokey), tvTxXmrToKey.getText().toString());
+            Toast.makeText(getActivity(), getString(R.string.message_copy_xmrtokey), Toast.LENGTH_SHORT).show();
+        });
+
+        tvXmrToSupport = view.findViewById(R.id.tvXmrToSupport);
+        tvXmrToSupport.setPaintFlags(tvXmrToSupport.getPaintFlags() | Paint.UNDERLINE_TEXT_FLAG);
+
+        return view;
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        return true;
+    }
+
+    private boolean isResumed = false;
+
+    @Override
+    public void onPauseFragment() {
+        isResumed = false;
+        super.onPauseFragment();
+    }
+
+    TxDataBtc btcData = null;
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        Helper.hideKeyboard(getActivity());
+        isResumed = true;
+
+        btcData = (TxDataBtc) sendListener.getTxData();
+        tvTxAddress.setText(btcData.getDestinationAddress());
+
+        final PendingTx committedTx = sendListener.getCommittedTx();
+        if (committedTx != null) {
+            tvTxId.setText(committedTx.txId);
+            bCopyTxId.setEnabled(true);
+            tvTxAmount.setText(getString(R.string.send_amount, Helper.getDisplayAmount(committedTx.amount)));
+            tvTxFee.setText(getString(R.string.send_fee, Helper.getDisplayAmount(committedTx.fee)));
+            if (btcData != null) {
+                NumberFormat df = NumberFormat.getInstance(Locale.US);
+                df.setMaximumFractionDigits(12);
+                String btcAmount = df.format(btcData.getBtcAmount());
+                tvXmrToAmount.setText(getString(R.string.info_send_xmrto_success_btc, btcAmount, btcData.getBtcSymbol()));
+                //TODO         btcData.getBtcAddress();
+                tvTxXmrToKey.setText(btcData.getXmrtoOrderId());
+                final Crypto crypto = Crypto.withSymbol(btcData.getBtcSymbol());
+                ivXmrToIcon.setImageResource(crypto.getIconEnabledId());
+                tvXmrToSupport.setOnClickListener(v -> {
+                    Uri orderUri = getXmrToApi().getQueryOrderUri(btcData.getXmrtoOrderId());
+                    Intent intent = new Intent(Intent.ACTION_VIEW, orderUri);
+                    startActivity(intent);
+                });
+                queryOrder();
+            } else {
+                throw new IllegalStateException("btcData is null");
+            }
+        }
+        sendListener.enableDone();
+    }
+
+    private void processQueryOrder(final QueryOrderStatus status) {
+        Timber.d("processQueryOrder %s for %s", status.getState().toString(), status.getOrderId());
+        if (!btcData.getXmrtoOrderId().equals(status.getOrderId()))
+            throw new IllegalStateException("UUIDs do not match!");
+        if (isResumed && (getView() != null))
+            getView().post(() -> {
+                showXmrToStatus(status);
+                if (!status.isTerminal()) {
+                    getView().postDelayed(this::queryOrder, SideShiftApi.QUERY_INTERVAL);
+                }
+            });
+    }
+
+    private void queryOrder() {
+        Timber.d("queryOrder(%s)", btcData.getXmrtoOrderId());
+        if (!isResumed) return;
+        getXmrToApi().queryOrderStatus(btcData.getXmrtoOrderId(), new ShiftCallback<QueryOrderStatus>() {
+            @Override
+            public void onSuccess(QueryOrderStatus status) {
+                if (!isAdded()) return;
+                processQueryOrder(status);
+            }
+
+            @Override
+            public void onError(final Exception ex) {
+                if (!isResumed) return;
+                Timber.w(ex);
+                getActivity().runOnUiThread(() -> {
+                    if (ex instanceof ShiftException) {
+                        Toast.makeText(getActivity(), ((ShiftException) ex).getError().getErrorMsg(), Toast.LENGTH_LONG).show();
+                    } else {
+                        Toast.makeText(getActivity(), ex.getLocalizedMessage(), Toast.LENGTH_LONG).show();
+                    }
+                });
+            }
+        });
+    }
+
+    void showXmrToStatus(final QueryOrderStatus status) {
+        int statusResource = 0;
+        if (status.isError()) {
+            tvXmrToStatus.setText(getString(R.string.info_send_xmrto_error, status.toString()));
+            statusResource = R.drawable.ic_error_red_24dp;
+            pbXmrto.getIndeterminateDrawable().setColorFilter(
+                    ThemeHelper.getThemedColor(getContext(), android.R.attr.colorError),
+                    android.graphics.PorterDuff.Mode.MULTIPLY);
+        } else if (status.isSent() || status.isPaid()) {
+            tvXmrToStatus.setText(getString(R.string.info_send_xmrto_sent, btcData.getBtcSymbol()));
+            statusResource = R.drawable.ic_success;
+            pbXmrto.getIndeterminateDrawable().setColorFilter(
+                    ThemeHelper.getThemedColor(getContext(), R.attr.positiveColor),
+                    android.graphics.PorterDuff.Mode.MULTIPLY);
+        } else if (status.isWaiting()) {
+            tvXmrToStatus.setText(getString(R.string.info_send_xmrto_unpaid));
+            statusResource = R.drawable.ic_pending;
+            pbXmrto.getIndeterminateDrawable().setColorFilter(
+                    ThemeHelper.getThemedColor(getContext(), R.attr.neutralColor),
+                    android.graphics.PorterDuff.Mode.MULTIPLY);
+        } else if (status.isPending()) {
+            tvXmrToStatus.setText(getString(R.string.info_send_xmrto_paid));
+            statusResource = R.drawable.ic_pending;
+            pbXmrto.getIndeterminateDrawable().setColorFilter(
+                    ThemeHelper.getThemedColor(getContext(), R.attr.neutralColor),
+                    android.graphics.PorterDuff.Mode.MULTIPLY);
+        } else {
+            throw new IllegalStateException("status is broken: " + status.toString());
+        }
+        ivXmrToStatus.setImageResource(statusResource);
+        if (status.isTerminal()) {
+            pbXmrto.setVisibility(View.INVISIBLE);
+            ivXmrToIcon.setVisibility(View.GONE);
+            ivXmrToStatus.setVisibility(View.GONE);
+            ivXmrToStatusBig.setImageResource(statusResource);
+            ivXmrToStatusBig.setVisibility(View.VISIBLE);
+        }
+    }
+
+    private SideShiftApi xmrToApi = null;
+
+    private SideShiftApi getXmrToApi() {
+        if (xmrToApi == null) {
+            synchronized (this) {
+                if (xmrToApi == null) {
+                    xmrToApi = new SideShiftApiImpl(ServiceHelper.getXmrToBaseUrl());
+                }
+            }
+        }
+        return xmrToApi;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendConfirm.java

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import com.m2049r.xmrwallet.model.PendingTransaction;
+
+interface SendConfirm {
+    void sendFailed(String errorText);
+
+    void createTransactionFailed(String errorText);
+
+    void transactionCreated(String txTag, PendingTransaction pendingTransaction);
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendConfirmWizardFragment.java

@@ -0,0 +1,247 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.os.Bundle;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.view.KeyEvent;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AlertDialog;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+import com.google.android.material.textfield.TextInputLayout;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.TxData;
+import com.m2049r.xmrwallet.data.UserNotes;
+import com.m2049r.xmrwallet.model.PendingTransaction;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+
+import timber.log.Timber;
+
+public class SendConfirmWizardFragment extends SendWizardFragment implements SendConfirm {
+
+    public static SendConfirmWizardFragment newInstance(Listener listener) {
+        SendConfirmWizardFragment instance = new SendConfirmWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    Listener sendListener;
+
+    public SendConfirmWizardFragment setSendListener(Listener listener) {
+        this.sendListener = listener;
+        return this;
+    }
+
+    interface Listener {
+        SendFragment.Listener getActivityCallback();
+
+        TxData getTxData();
+
+        void commitTransaction();
+
+        void disposeTransaction();
+
+        SendFragment.Mode getMode();
+    }
+
+    private TextView tvTxAddress;
+    private TextView tvTxNotes;
+    private TextView tvTxAmount;
+    private TextView tvTxFee;
+    private TextView tvTxTotal;
+    private View llProgress;
+    private View bSend;
+    private View llConfirmSend;
+    private View pbProgressSend;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Timber.d("onCreateView() %s", (String.valueOf(savedInstanceState)));
+
+        View view = inflater.inflate(
+                R.layout.fragment_send_confirm, container, false);
+
+        tvTxAddress = view.findViewById(R.id.tvTxAddress);
+        tvTxNotes = view.findViewById(R.id.tvTxNotes);
+        tvTxAmount = view.findViewById(R.id.tvTxAmount);
+        tvTxFee = view.findViewById(R.id.tvTxFee);
+        tvTxTotal = view.findViewById(R.id.tvTxTotal);
+
+        llProgress = view.findViewById(R.id.llProgress);
+        pbProgressSend = view.findViewById(R.id.pbProgressSend);
+        llConfirmSend = view.findViewById(R.id.llConfirmSend);
+
+        bSend = view.findViewById(R.id.bSend);
+        bSend.setEnabled(false);
+        bSend.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Timber.d("bSend.setOnClickListener");
+                bSend.setEnabled(false);
+                preSend();
+            }
+        });
+        return view;
+    }
+
+    boolean inProgress = false;
+
+    public void hideProgress() {
+        llProgress.setVisibility(View.INVISIBLE);
+        inProgress = false;
+    }
+
+    public void showProgress() {
+        llProgress.setVisibility(View.VISIBLE);
+        inProgress = true;
+    }
+
+    PendingTransaction pendingTransaction = null;
+
+    @Override
+    // callback from wallet when PendingTransaction created
+    public void transactionCreated(String txTag, PendingTransaction pendingTransaction) {
+        // ignore txTag - the app flow ensures this is the correct tx
+        // TODO: use the txTag
+        hideProgress();
+        if (isResumed) {
+            this.pendingTransaction = pendingTransaction;
+            refreshTransactionDetails();
+        } else {
+            sendListener.disposeTransaction();
+        }
+    }
+
+    void send() {
+        sendListener.commitTransaction();
+        getActivity().runOnUiThread(() -> pbProgressSend.setVisibility(View.VISIBLE));
+    }
+
+    @Override
+    public void sendFailed(String errorText) {
+        pbProgressSend.setVisibility(View.INVISIBLE);
+        showAlert(getString(R.string.send_create_tx_error_title), errorText);
+    }
+
+    @Override
+    public void createTransactionFailed(String errorText) {
+        hideProgress();
+        showAlert(getString(R.string.send_create_tx_error_title), errorText);
+    }
+
+    private void showAlert(String title, String message) {
+        AlertDialog.Builder builder = new MaterialAlertDialogBuilder(getActivity());
+        builder.setCancelable(true).
+                setTitle(title).
+                setMessage(message).
+                create().
+                show();
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        return true;
+    }
+
+    private boolean isResumed = false;
+
+    @Override
+    public void onPauseFragment() {
+        isResumed = false;
+        pendingTransaction = null;
+        sendListener.disposeTransaction();
+        refreshTransactionDetails();
+        super.onPauseFragment();
+    }
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        Helper.hideKeyboard(getActivity());
+        isResumed = true;
+
+        final TxData txData = sendListener.getTxData();
+        tvTxAddress.setText(txData.getDestinationAddress());
+        UserNotes notes = sendListener.getTxData().getUserNotes();
+        if ((notes != null) && (!notes.note.isEmpty())) {
+            tvTxNotes.setText(notes.note);
+        } else {
+            tvTxNotes.setText("-");
+        }
+        refreshTransactionDetails();
+        if ((pendingTransaction == null) && (!inProgress)) {
+            showProgress();
+            prepareSend(txData);
+        }
+    }
+
+    void refreshTransactionDetails() {
+        Timber.d("refreshTransactionDetails()");
+        if (pendingTransaction != null) {
+            llConfirmSend.setVisibility(View.VISIBLE);
+            bSend.setEnabled(true);
+            tvTxFee.setText(Wallet.getDisplayAmount(pendingTransaction.getFee()));
+            if (getActivityCallback().isStreetMode()
+                    && (sendListener.getTxData().getAmount() == Wallet.SWEEP_ALL)) {
+                tvTxAmount.setText(getString(R.string.street_sweep_amount));
+                tvTxTotal.setText(getString(R.string.street_sweep_amount));
+            } else {
+                tvTxAmount.setText(Wallet.getDisplayAmount(pendingTransaction.getAmount()));
+                tvTxTotal.setText(Wallet.getDisplayAmount(
+                        pendingTransaction.getFee() + pendingTransaction.getAmount()));
+            }
+        } else {
+            llConfirmSend.setVisibility(View.GONE);
+            bSend.setEnabled(false);
+        }
+    }
+
+    public void preSend() {
+        Helper.promptPassword(getContext(), getActivityCallback().getWalletName(), false, new Helper.PasswordAction() {
+            @Override
+            public void act(String walletName, String password, boolean fingerprintUsed) {
+                send();
+            }
+
+            public void fail(String walletName) {
+                getActivity().runOnUiThread(() -> {
+                    bSend.setEnabled(true); // allow to try again
+                });
+            }
+        });
+    }
+
+    // creates a pending transaction and calls us back with transactionCreated()
+    // or createTransactionFailed()
+    void prepareSend(TxData txData) {
+        getActivityCallback().onPrepareSend(null, txData);
+    }
+
+    SendFragment.Listener getActivityCallback() {
+        return sendListener.getActivityCallback();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendFragment.java

@@ -0,0 +1,558 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.text.InputType;
+import android.util.SparseArray;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.EditText;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentStatePagerAdapter;
+import androidx.viewpager.widget.ViewPager;
+
+import com.google.android.material.transition.MaterialContainerTransform;
+import com.m2049r.xmrwallet.OnBackPressedListener;
+import com.m2049r.xmrwallet.OnUriScannedListener;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.WalletActivity;
+import com.m2049r.xmrwallet.data.BarcodeData;
+import com.m2049r.xmrwallet.data.PendingTx;
+import com.m2049r.xmrwallet.data.TxData;
+import com.m2049r.xmrwallet.data.TxDataBtc;
+import com.m2049r.xmrwallet.data.UserNotes;
+import com.m2049r.xmrwallet.layout.SpendViewPager;
+import com.m2049r.xmrwallet.model.PendingTransaction;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.Notice;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+import com.m2049r.xmrwallet.widget.DotBar;
+import com.m2049r.xmrwallet.widget.Toolbar;
+
+import java.lang.ref.WeakReference;
+
+import timber.log.Timber;
+
+public class SendFragment extends Fragment
+        implements SendAddressWizardFragment.Listener,
+        SendAmountWizardFragment.Listener,
+        SendConfirmWizardFragment.Listener,
+        SendSuccessWizardFragment.Listener,
+        OnBackPressedListener, OnUriScannedListener {
+
+    final static public int MIXIN = 0;
+
+    private Listener activityCallback;
+
+    public interface Listener {
+        SharedPreferences getPrefs();
+
+        long getTotalFunds();
+
+        boolean isStreetMode();
+
+        void onPrepareSend(String tag, TxData data);
+
+        String getWalletName();
+
+        void onSend(UserNotes notes);
+
+        void onDisposeRequest();
+
+        void onFragmentDone();
+
+        void setToolbarButton(int type);
+
+        void setTitle(String title);
+
+        void setSubtitle(String subtitle);
+
+        void setOnUriScannedListener(OnUriScannedListener onUriScannedListener);
+    }
+
+    private View llNavBar;
+    private DotBar dotBar;
+    private Button bPrev;
+    private Button bNext;
+
+    private Button bDone;
+
+    static private final int MAX_FALLBACK = Integer.MAX_VALUE;
+
+    public static SendFragment newInstance(String uri) {
+        SendFragment f = new SendFragment();
+        Bundle args = new Bundle();
+        args.putString(WalletActivity.REQUEST_URI, uri);
+        f.setArguments(args);
+        return f;
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        final View view = inflater.inflate(R.layout.fragment_send, container, false);
+
+        llNavBar = view.findViewById(R.id.llNavBar);
+        bDone = view.findViewById(R.id.bDone);
+
+        dotBar = view.findViewById(R.id.dotBar);
+        bPrev = view.findViewById(R.id.bPrev);
+        bNext = view.findViewById(R.id.bNext);
+
+        ViewGroup llNotice = view.findViewById(R.id.llNotice);
+        Notice.showAll(llNotice, ".*_send");
+
+        spendViewPager = view.findViewById(R.id.pager);
+        pagerAdapter = new SpendPagerAdapter(getChildFragmentManager());
+        spendViewPager.setOffscreenPageLimit(pagerAdapter.getCount()); // load & keep all pages in cache
+        spendViewPager.setAdapter(pagerAdapter);
+
+        spendViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
+            private int fallbackPosition = MAX_FALLBACK;
+            private int currentPosition = 0;
+
+            @Override
+            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+            }
+
+            @Override
+            public void onPageSelected(int newPosition) {
+                Timber.d("onPageSelected=%d/%d", newPosition, fallbackPosition);
+                if (fallbackPosition < newPosition) {
+                    spendViewPager.setCurrentItem(fallbackPosition);
+                } else {
+                    pagerAdapter.getFragment(currentPosition).onPauseFragment();
+                    pagerAdapter.getFragment(newPosition).onResumeFragment();
+                    updatePosition(newPosition);
+                    currentPosition = newPosition;
+                    fallbackPosition = MAX_FALLBACK;
+                }
+            }
+
+            @Override
+            public void onPageScrollStateChanged(int state) {
+                if (state == ViewPager.SCROLL_STATE_DRAGGING) {
+                    if (!spendViewPager.validateFields(spendViewPager.getCurrentItem())) {
+                        fallbackPosition = spendViewPager.getCurrentItem();
+                    } else {
+                        fallbackPosition = spendViewPager.getCurrentItem() + 1;
+                    }
+                }
+            }
+        });
+
+        bPrev.setOnClickListener(v -> spendViewPager.previous());
+
+        bNext.setOnClickListener(v -> spendViewPager.next());
+
+        bDone.setOnClickListener(v -> {
+            Timber.d("bDone.onClick");
+            activityCallback.onFragmentDone();
+        });
+
+        updatePosition(0);
+
+        final EditText etDummy = view.findViewById(R.id.etDummy);
+        etDummy.setRawInputType(InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS);
+        etDummy.requestFocus();
+        Helper.hideKeyboard(getActivity());
+
+        Bundle args = getArguments();
+        if (args != null) {
+            String uri = args.getString(WalletActivity.REQUEST_URI);
+            Timber.d("URI: %s", uri);
+            if (uri != null) {
+                barcodeData = BarcodeData.fromString(uri);
+                Timber.d("barcodeData: %s", barcodeData != null ? barcodeData.toString() : "null");
+            }
+        }
+
+        return view;
+    }
+
+    void updatePosition(int position) {
+        dotBar.setActiveDot(position);
+        CharSequence nextLabel = pagerAdapter.getPageTitle(position + 1);
+        bNext.setText(nextLabel);
+        if (nextLabel != null) {
+            bNext.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_navigate_next, 0);
+        } else {
+            bNext.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
+        }
+        CharSequence prevLabel = pagerAdapter.getPageTitle(position - 1);
+        bPrev.setText(prevLabel);
+        if (prevLabel != null) {
+            bPrev.setCompoundDrawablesWithIntrinsicBounds(R.drawable.ic_navigate_prev, 0, 0, 0);
+        } else {
+            bPrev.setCompoundDrawablesWithIntrinsicBounds(0, 0, 0, 0);
+        }
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Timber.d("onResume");
+        activityCallback.setSubtitle(getString(R.string.send_title));
+        if (spendViewPager.getCurrentItem() == SpendPagerAdapter.POS_SUCCESS) {
+            activityCallback.setToolbarButton(Toolbar.BUTTON_NONE);
+        } else {
+            activityCallback.setToolbarButton(Toolbar.BUTTON_CANCEL);
+        }
+    }
+
+    @Override
+    public void onAttach(@NonNull Context context) {
+        Timber.d("onAttach %s", context);
+        super.onAttach(context);
+        if (context instanceof Listener) {
+            activityCallback = (Listener) context;
+            activityCallback.setOnUriScannedListener(this);
+        } else {
+            throw new ClassCastException(context.toString()
+                    + " must implement Listener");
+        }
+    }
+
+    @Override
+    public void onDetach() {
+        activityCallback.setOnUriScannedListener(null);
+        super.onDetach();
+    }
+
+    private SpendViewPager spendViewPager;
+    private SpendPagerAdapter pagerAdapter;
+
+    @Override
+    public boolean onBackPressed() {
+        if (isComitted()) return true; // no going back
+        if (spendViewPager.getCurrentItem() == 0) {
+            return false;
+        } else {
+            spendViewPager.previous();
+            return true;
+        }
+    }
+
+    @Override
+    public boolean onUriScanned(BarcodeData barcodeData) {
+        if (spendViewPager.getCurrentItem() == SpendPagerAdapter.POS_ADDRESS) {
+            final SendWizardFragment fragment = pagerAdapter.getFragment(SpendPagerAdapter.POS_ADDRESS);
+            if (fragment instanceof SendAddressWizardFragment) {
+                ((SendAddressWizardFragment) fragment).processScannedData(barcodeData);
+                return true;
+            }
+        }
+        return false;
+    }
+
+    enum Mode {
+        XMR, BTC
+    }
+
+    Mode mode = Mode.XMR;
+
+    @Override
+    public void setMode(Mode aMode) {
+        if (mode != aMode) {
+            mode = aMode;
+            switch (aMode) {
+                case XMR:
+                    txData = new TxData();
+                    break;
+                case BTC:
+                    txData = new TxDataBtc();
+                    break;
+                default:
+                    throw new IllegalArgumentException("Mode " + String.valueOf(aMode) + " unknown!");
+            }
+            getView().post(() -> pagerAdapter.notifyDataSetChanged());
+            Timber.d("New Mode = %s", mode.toString());
+        }
+    }
+
+    @Override
+    public Mode getMode() {
+        return mode;
+    }
+
+    public class SpendPagerAdapter extends FragmentStatePagerAdapter {
+        private static final int POS_ADDRESS = 0;
+        private static final int POS_AMOUNT = 1;
+        private static final int POS_CONFIRM = 2;
+        private static final int POS_SUCCESS = 3;
+        private int numPages = 3;
+
+        SparseArray<WeakReference<SendWizardFragment>> myFragments = new SparseArray<>();
+
+        public SpendPagerAdapter(FragmentManager fm) {
+            super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
+        }
+
+        public void addSuccess() {
+            numPages++;
+            notifyDataSetChanged();
+        }
+
+        @Override
+        public int getCount() {
+            return numPages;
+        }
+
+        @NonNull
+        @Override
+        public Object instantiateItem(@NonNull ViewGroup container, int position) {
+            Timber.d("instantiateItem %d", position);
+            SendWizardFragment fragment = (SendWizardFragment) super.instantiateItem(container, position);
+            myFragments.put(position, new WeakReference<>(fragment));
+            return fragment;
+        }
+
+        @Override
+        public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
+            Timber.d("destroyItem %d", position);
+            myFragments.remove(position);
+            super.destroyItem(container, position, object);
+        }
+
+        public SendWizardFragment getFragment(int position) {
+            WeakReference<SendWizardFragment> ref = myFragments.get(position);
+            if (ref != null)
+                return myFragments.get(position).get();
+            else
+                return null;
+        }
+
+        @NonNull
+        @Override
+        public SendWizardFragment getItem(int position) {
+            Timber.d("getItem(%d) CREATE", position);
+            Timber.d("Mode=%s", mode.toString());
+            if (mode == Mode.XMR) {
+                switch (position) {
+                    case POS_ADDRESS:
+                        return SendAddressWizardFragment.newInstance(SendFragment.this);
+                    case POS_AMOUNT:
+                        return SendAmountWizardFragment.newInstance(SendFragment.this);
+                    case POS_CONFIRM:
+                        return SendConfirmWizardFragment.newInstance(SendFragment.this);
+                    case POS_SUCCESS:
+                        return SendSuccessWizardFragment.newInstance(SendFragment.this);
+                    default:
+                        throw new IllegalArgumentException("no such send position(" + position + ")");
+                }
+            } else if (mode == Mode.BTC) {
+                switch (position) {
+                    case POS_ADDRESS:
+                        return SendAddressWizardFragment.newInstance(SendFragment.this);
+                    case POS_AMOUNT:
+                        return SendBtcAmountWizardFragment.newInstance(SendFragment.this);
+                    case POS_CONFIRM:
+                        return SendBtcConfirmWizardFragment.newInstance(SendFragment.this);
+                    case POS_SUCCESS:
+                        return SendBtcSuccessWizardFragment.newInstance(SendFragment.this);
+                    default:
+                        throw new IllegalArgumentException("no such send position(" + position + ")");
+                }
+            } else {
+                throw new IllegalStateException("Unknown mode!");
+            }
+        }
+
+        @Override
+        public CharSequence getPageTitle(int position) {
+            Timber.d("getPageTitle(%d)", position);
+            if (position >= numPages) return null;
+            switch (position) {
+                case POS_ADDRESS:
+                    return getString(R.string.send_address_title);
+                case POS_AMOUNT:
+                    return getString(R.string.send_amount_title);
+                case POS_CONFIRM:
+                    return getString(R.string.send_confirm_title);
+                case POS_SUCCESS:
+                    return getString(R.string.send_success_title);
+                default:
+                    return null;
+            }
+        }
+
+        @Override
+        public int getItemPosition(@NonNull Object object) {
+            Timber.d("getItemPosition %s", String.valueOf(object));
+            if (object instanceof SendAddressWizardFragment) {
+                // keep these pages
+                return POSITION_UNCHANGED;
+            } else {
+                return POSITION_NONE;
+            }
+        }
+    }
+
+    @Override
+    public TxData getTxData() {
+        return txData;
+    }
+
+    private TxData txData = new TxData();
+
+    private BarcodeData barcodeData;
+
+    // Listeners
+    @Override
+    public void setBarcodeData(BarcodeData data) {
+        barcodeData = data;
+    }
+
+    @Override
+    public BarcodeData getBarcodeData() {
+        return barcodeData;
+    }
+
+    @Override
+    public BarcodeData popBarcodeData() {
+        Timber.d("POPPED");
+        BarcodeData data = barcodeData;
+        barcodeData = null;
+        return data;
+    }
+
+    boolean isComitted() {
+        return committedTx != null;
+    }
+
+    PendingTx committedTx;
+
+    @Override
+    public PendingTx getCommittedTx() {
+        return committedTx;
+    }
+
+
+    @Override
+    public void commitTransaction() {
+        Timber.d("REALLY SEND");
+        disableNavigation(); // committed - disable all navigation
+        activityCallback.onSend(txData.getUserNotes());
+        committedTx = pendingTx;
+    }
+
+    void disableNavigation() {
+        spendViewPager.allowSwipe(false);
+    }
+
+    void enableNavigation() {
+        spendViewPager.allowSwipe(true);
+    }
+
+    @Override
+    public void enableDone() {
+        llNavBar.setVisibility(View.INVISIBLE);
+        bDone.setVisibility(View.VISIBLE);
+    }
+
+    public Listener getActivityCallback() {
+        return activityCallback;
+    }
+
+
+    // callbacks from send service
+
+    public void onTransactionCreated(final String txTag, final PendingTransaction pendingTransaction) {
+        final SendConfirm confirm = getSendConfirm();
+        if (confirm != null) {
+            pendingTx = new PendingTx(pendingTransaction);
+            confirm.transactionCreated(txTag, pendingTransaction);
+        } else {
+            // not in confirm fragment => dispose & move on
+            disposeTransaction();
+        }
+    }
+
+    @Override
+    public void disposeTransaction() {
+        pendingTx = null;
+        activityCallback.onDisposeRequest();
+    }
+
+    PendingTx pendingTx;
+
+    public PendingTx getPendingTx() {
+        return pendingTx;
+    }
+
+    public void onCreateTransactionFailed(String errorText) {
+        final SendConfirm confirm = getSendConfirm();
+        if (confirm != null) {
+            confirm.createTransactionFailed(errorText);
+        }
+    }
+
+    SendConfirm getSendConfirm() {
+        final SendWizardFragment fragment = pagerAdapter.getFragment(SpendPagerAdapter.POS_CONFIRM);
+        if (fragment instanceof SendConfirm) {
+            return (SendConfirm) fragment;
+        } else {
+            return null;
+        }
+    }
+
+    public void onTransactionSent(final String txId) {
+        Timber.d("txid=%s", txId);
+        pagerAdapter.addSuccess();
+        Timber.d("numPages=%d", spendViewPager.getAdapter().getCount());
+        activityCallback.setToolbarButton(Toolbar.BUTTON_NONE);
+        spendViewPager.setCurrentItem(SpendPagerAdapter.POS_SUCCESS);
+    }
+
+    public void onSendTransactionFailed(final String error) {
+        Timber.d("error=%s", error);
+        committedTx = null;
+        final SendConfirm confirm = getSendConfirm();
+        if (confirm != null) {
+            confirm.sendFailed(getString(R.string.status_transaction_failed, error));
+        }
+        enableNavigation();
+    }
+
+    public void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setHasOptionsMenu(true);
+        final MaterialContainerTransform transform = new MaterialContainerTransform();
+        transform.setDrawingViewId(R.id.fragment_container);
+        transform.setDuration(getResources().getInteger(R.integer.tx_item_transition_duration));
+        transform.setAllContainerColors(ThemeHelper.getThemedColor(getContext(), android.R.attr.colorBackground));
+        setSharedElementEnterTransition(transform);
+    }
+
+    @Override
+    public void onCreateOptionsMenu(@NonNull Menu menu, MenuInflater inflater) {
+        inflater.inflate(R.menu.send_menu, menu);
+        super.onCreateOptionsMenu(menu, inflater);
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendSuccessWizardFragment.java

@@ -0,0 +1,128 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.TextView;
+import android.widget.Toast;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.PendingTx;
+import com.m2049r.xmrwallet.data.TxData;
+import com.m2049r.xmrwallet.model.Wallet;
+import com.m2049r.xmrwallet.util.Helper;
+
+import timber.log.Timber;
+
+public class SendSuccessWizardFragment extends SendWizardFragment {
+
+    public static SendSuccessWizardFragment newInstance(Listener listener) {
+        SendSuccessWizardFragment instance = new SendSuccessWizardFragment();
+        instance.setSendListener(listener);
+        return instance;
+    }
+
+    Listener sendListener;
+
+    public SendSuccessWizardFragment setSendListener(Listener listener) {
+        this.sendListener = listener;
+        return this;
+    }
+
+    interface Listener {
+        TxData getTxData();
+
+        PendingTx getCommittedTx();
+
+        void enableDone();
+
+        SendFragment.Mode getMode();
+
+        SendFragment.Listener getActivityCallback();
+    }
+
+    ImageButton bCopyTxId;
+    private TextView tvTxId;
+    private TextView tvTxAddress;
+    private TextView tvTxPaymentId;
+    private TextView tvTxAmount;
+    private TextView tvTxFee;
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+
+        Timber.d("onCreateView() %s", (String.valueOf(savedInstanceState)));
+
+        View view = inflater.inflate(
+                R.layout.fragment_send_success, container, false);
+
+        bCopyTxId = view.findViewById(R.id.bCopyTxId);
+        bCopyTxId.setEnabled(false);
+        bCopyTxId.setOnClickListener(v -> {
+            Helper.clipBoardCopy(getActivity(), getString(R.string.label_send_txid), tvTxId.getText().toString());
+            Toast.makeText(getActivity(), getString(R.string.message_copy_txid), Toast.LENGTH_SHORT).show();
+        });
+
+        tvTxId = view.findViewById(R.id.tvTxId);
+        tvTxAddress = view.findViewById(R.id.tvTxAddress);
+        tvTxPaymentId = view.findViewById(R.id.tvTxPaymentId);
+        tvTxAmount = view.findViewById(R.id.tvTxAmount);
+        tvTxFee = view.findViewById(R.id.tvTxFee);
+
+        return view;
+    }
+
+    @Override
+    public boolean onValidateFields() {
+        return true;
+    }
+
+    @Override
+    public void onPauseFragment() {
+        super.onPauseFragment();
+    }
+
+    @Override
+    public void onResumeFragment() {
+        super.onResumeFragment();
+        Timber.d("onResumeFragment()");
+        Helper.hideKeyboard(getActivity());
+
+        final TxData txData = sendListener.getTxData();
+        tvTxAddress.setText(txData.getDestinationAddress());
+
+        final PendingTx committedTx = sendListener.getCommittedTx();
+        if (committedTx != null) {
+            tvTxId.setText(committedTx.txId);
+            bCopyTxId.setEnabled(true);
+
+            if (sendListener.getActivityCallback().isStreetMode()
+                    && (sendListener.getTxData().getAmount() == Wallet.SWEEP_ALL)) {
+                tvTxAmount.setText(getString(R.string.street_sweep_amount));
+            } else {
+                tvTxAmount.setText(getString(R.string.send_amount, Helper.getDisplayAmount(committedTx.amount)));
+            }
+            tvTxFee.setText(getString(R.string.send_fee, Helper.getDisplayAmount(committedTx.fee)));
+        }
+        sendListener.enableDone();
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/fragment/send/SendWizardFragment.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.fragment.send;
+
+import androidx.fragment.app.Fragment;
+
+import com.m2049r.xmrwallet.layout.SpendViewPager;
+
+abstract public class SendWizardFragment extends Fragment
+        implements SpendViewPager.OnValidateFieldsListener {
+
+    @Override
+    public boolean onValidateFields() {
+        return true;
+    }
+
+    public void onPauseFragment() {
+    }
+
+    public void onResumeFragment() {
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/layout/DiffCallback.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2021 yorha-0x
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.layout;
+
+import androidx.recyclerview.widget.DiffUtil;
+
+import java.util.List;
+
+public abstract class DiffCallback<T> extends DiffUtil.Callback {
+
+    protected final List<T> mOldList;
+    protected final List<T> mNewList;
+
+    public DiffCallback(List<T> oldList, List<T> newList) {
+        this.mOldList = oldList;
+        this.mNewList = newList;
+    }
+
+    @Override
+    public int getOldListSize() {
+        return mOldList.size();
+    }
+
+    @Override
+    public int getNewListSize() {
+        return mNewList.size();
+    }
+
+    public abstract boolean areItemsTheSame(int oldItemPosition, int newItemPosition);
+
+    public abstract boolean areContentsTheSame(int oldItemPosition, int newItemPosition);
+}

app/src/main/java/com/m2049r/xmrwallet/layout/NodeInfoAdapter.java

@@ -0,0 +1,261 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.layout;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.FragmentActivity;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.NodeInfo;
+import com.m2049r.xmrwallet.dialog.HelpFragment;
+import com.m2049r.xmrwallet.util.NetCipherHelper;
+
+import java.net.HttpURLConnection;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+public class NodeInfoAdapter extends RecyclerView.Adapter<NodeInfoAdapter.ViewHolder> {
+    public interface OnInteractionListener {
+        void onInteraction(View view, NodeInfo item);
+
+        boolean onLongInteraction(View view, NodeInfo item);
+    }
+
+    private final List<NodeInfo> nodeItems = new ArrayList<>();
+    private final OnInteractionListener listener;
+
+    private final FragmentActivity activity;
+
+    public NodeInfoAdapter(FragmentActivity activity, OnInteractionListener listener) {
+        this.activity = activity;
+        this.listener = listener;
+    }
+
+    public void notifyItemChanged(NodeInfo nodeInfo) {
+        final int pos = nodeItems.indexOf(nodeInfo);
+        if (pos >= 0) notifyItemChanged(pos);
+    }
+
+    private static class NodeDiff extends DiffCallback<NodeInfo> {
+
+        public NodeDiff(List<NodeInfo> oldList, List<NodeInfo> newList) {
+            super(oldList, newList);
+        }
+
+        @Override
+        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).equals(mNewList.get(newItemPosition));
+        }
+
+        @Override
+        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+            final NodeInfo oldItem = mOldList.get(oldItemPosition);
+            final NodeInfo newItem = mNewList.get(newItemPosition);
+            return (oldItem.getTimestamp() == newItem.getTimestamp())
+                    && (oldItem.isTested() == newItem.isTested())
+                    && (oldItem.isValid() == newItem.isValid())
+                    && (oldItem.getResponseTime() == newItem.getResponseTime())
+                    && (oldItem.isSelected() == newItem.isSelected())
+                    && (oldItem.getName().equals(newItem.getName()));
+        }
+    }
+
+    @Override
+    public @NonNull
+    ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_node, parent, false);
+        return new ViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(final @NonNull ViewHolder holder, int position) {
+        holder.bind(position);
+    }
+
+    @Override
+    public int getItemCount() {
+        return nodeItems.size();
+    }
+
+    public void addNode(NodeInfo node) {
+        List<NodeInfo> newItems = new ArrayList<>(nodeItems);
+        if (!nodeItems.contains(node))
+            newItems.add(node);
+        setNodes(newItems); // in case the nodeinfo has changed
+    }
+
+    public void setNodes(Collection<NodeInfo> newItemsCollection) {
+        List<NodeInfo> newItems;
+        if (newItemsCollection != null) {
+            newItems = new ArrayList<>(newItemsCollection);
+            Collections.sort(newItems, NodeInfo.BestNodeComparator);
+        } else {
+            newItems = new ArrayList<>();
+        }
+        final NodeInfoAdapter.NodeDiff diffCallback = new NodeInfoAdapter.NodeDiff(nodeItems, newItems);
+        final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
+        nodeItems.clear();
+        nodeItems.addAll(newItems);
+        diffResult.dispatchUpdatesTo(this);
+    }
+
+    public void setNodes() {
+        setNodes(nodeItems);
+    }
+
+    private boolean itemsClickable = true;
+
+    public void allowClick(boolean clickable) {
+        itemsClickable = clickable;
+        notifyDataSetChanged();
+    }
+
+    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
+        final ImageButton ibBookmark;
+        final View pbBookmark;
+        final TextView tvName;
+        final TextView tvInfo;
+        final ImageView ivPing;
+        NodeInfo nodeItem;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+            ibBookmark = itemView.findViewById(R.id.ibBookmark);
+            pbBookmark = itemView.findViewById(R.id.pbBookmark);
+            tvName = itemView.findViewById(R.id.tvName);
+            tvInfo = itemView.findViewById(R.id.tvInfo);
+            ivPing = itemView.findViewById(R.id.ivPing);
+            ibBookmark.setOnClickListener(v -> {
+                nodeItem.toggleFavourite();
+                showStar();
+                if (!nodeItem.isFavourite()) {
+                    nodeItem.setSelected(false);
+                    setNodes(nodeItems);
+                }
+            });
+            itemView.setOnClickListener(this);
+            itemView.setOnLongClickListener(this);
+        }
+
+        private void showStar() {
+            if (nodeItem.isFavourite()) {
+                ibBookmark.setImageResource(R.drawable.ic_favorite_24dp);
+            } else {
+                ibBookmark.setImageResource(R.drawable.ic_favorite_border_24dp);
+            }
+        }
+
+        void bind(int position) {
+            nodeItem = nodeItems.get(position);
+            tvName.setText(nodeItem.getName());
+            ivPing.setImageResource(getPingIcon(nodeItem));
+            if (nodeItem.isTested()) {
+                if (nodeItem.isValid()) {
+                    nodeItem.showInfo(tvInfo);
+                } else {
+                    nodeItem.showInfo(tvInfo, getResponseErrorText(activity, nodeItem.getResponseCode()), true);
+                }
+            } else {
+                nodeItem.showInfo(tvInfo);
+            }
+            itemView.setSelected(nodeItem.isSelected());
+            itemView.setClickable(itemsClickable);
+            itemView.setEnabled(itemsClickable);
+            ibBookmark.setClickable(itemsClickable);
+            pbBookmark.setVisibility(nodeItem.isSelecting() ? View.VISIBLE : View.INVISIBLE);
+            showStar();
+        }
+
+        @Override
+        public void onClick(View view) {
+            if (listener != null) {
+                int position = getAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    final NodeInfo node = nodeItems.get(position);
+                    if (node.isOnion()) {
+                        switch (NetCipherHelper.getStatus()) {
+                            case NOT_INSTALLED:
+                                HelpFragment.display(activity.getSupportFragmentManager(), R.string.help_tor);
+                                return;
+                            case DISABLED:
+                                HelpFragment.display(activity.getSupportFragmentManager(), R.string.help_tor_enable);
+                                return;
+                        }
+                    }
+                    node.setSelecting(true);
+                    allowClick(false);
+                    listener.onInteraction(view, node);
+                }
+            }
+        }
+
+        @Override
+        public boolean onLongClick(View view) {
+            if (listener != null) {
+                int position = getAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    return listener.onLongInteraction(view, nodeItems.get(position));
+                }
+            }
+            return false;
+        }
+    }
+
+    static public int getPingIcon(NodeInfo nodeInfo) {
+        if (nodeInfo.isUnauthorized()) {
+            return R.drawable.ic_wifi_lock;
+        }
+        if (nodeInfo.isValid()) {
+            final double ping = nodeInfo.getResponseTime();
+            if (ping < NodeInfo.PING_GOOD) {
+                return R.drawable.ic_wifi_4_bar;
+            } else if (ping < NodeInfo.PING_MEDIUM) {
+                return R.drawable.ic_wifi_3_bar;
+            } else if (ping < NodeInfo.PING_BAD) {
+                return R.drawable.ic_wifi_2_bar;
+            } else {
+                return R.drawable.ic_wifi_1_bar;
+            }
+        } else {
+            return R.drawable.ic_wifi_off;
+        }
+    }
+
+    static public String getResponseErrorText(Context ctx, int responseCode) {
+        if (responseCode == 0) {
+            return ctx.getResources().getString(R.string.node_general_error);
+        } else if (responseCode == HttpURLConnection.HTTP_UNAUTHORIZED) {
+            return ctx.getResources().getString(R.string.node_auth_error);
+        } else if (responseCode == 418) {
+            return ctx.getResources().getString(R.string.node_tor_error);
+        } else {
+            return ctx.getResources().getString(R.string.node_test_error, responseCode);
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/layout/SpendViewPager.java

@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.layout;
+
+import android.content.Context;
+import androidx.viewpager.widget.ViewPager;
+import android.util.AttributeSet;
+import android.view.MotionEvent;
+
+import com.m2049r.xmrwallet.fragment.send.SendFragment;
+
+public class SpendViewPager extends ViewPager {
+
+    public interface OnValidateFieldsListener {
+        boolean onValidateFields();
+    }
+
+    public SpendViewPager(Context context) {
+        super(context);
+    }
+
+    public SpendViewPager(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    public void next() {
+        int pos = getCurrentItem();
+        if (validateFields(pos)) {
+            setCurrentItem(pos + 1);
+        }
+    }
+
+    public void previous() {
+        setCurrentItem(getCurrentItem() - 1);
+    }
+
+    private boolean allowSwipe = true;
+
+    public void allowSwipe(boolean allow) {
+        allowSwipe = allow;
+    }
+
+    public boolean validateFields(int position) {
+        OnValidateFieldsListener c = ((SendFragment.SpendPagerAdapter) getAdapter()).getFragment(position);
+        return c.onValidateFields();
+    }
+
+    @Override
+    public boolean onInterceptTouchEvent(MotionEvent event) {
+        if (allowSwipe) return super.onInterceptTouchEvent(event);
+        return false;
+    }
+
+    @Override
+    public boolean onTouchEvent(MotionEvent event) {
+        if (allowSwipe) return super.onTouchEvent(event);
+        return false;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/layout/SubaddressInfoAdapter.java

@@ -0,0 +1,164 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.layout;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.Subaddress;
+import com.m2049r.xmrwallet.util.Helper;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+import timber.log.Timber;
+
+public class SubaddressInfoAdapter extends RecyclerView.Adapter<SubaddressInfoAdapter.ViewHolder> {
+    public interface OnInteractionListener {
+        void onInteraction(View view, Subaddress item);
+
+        boolean onLongInteraction(View view, Subaddress item);
+    }
+
+    private final List<Subaddress> items;
+    private final OnInteractionListener listener;
+
+    Context context;
+
+    public SubaddressInfoAdapter(Context context, OnInteractionListener listener) {
+        this.context = context;
+        this.items = new ArrayList<>();
+        this.listener = listener;
+    }
+
+    private static class SubaddressInfoDiff extends DiffCallback<Subaddress> {
+
+        public SubaddressInfoDiff(List<Subaddress> oldList, List<Subaddress> newList) {
+            super(oldList, newList);
+        }
+
+        @Override
+        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).getAddress().equals(mNewList.get(newItemPosition).getAddress());
+        }
+
+        @Override
+        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).equals(mNewList.get(newItemPosition));
+        }
+    }
+
+    @NonNull
+    @Override
+    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.item_subaddress, parent, false);
+        return new ViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(final ViewHolder holder, int position) {
+        holder.bind(position);
+    }
+
+    @Override
+    public int getItemCount() {
+        return items.size();
+    }
+
+    public Subaddress getItem(int position) {
+        return items.get(position);
+    }
+
+    public void setInfos(List<Subaddress> newItems) {
+        if (newItems == null) {
+            newItems = new ArrayList<>();
+            Timber.d("setInfos null");
+        } else {
+            Timber.d("setInfos %s", newItems.size());
+        }
+        Collections.sort(newItems);
+        final DiffCallback<Subaddress> diffCallback = new SubaddressInfoDiff(items, newItems);
+        final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
+        items.clear();
+        items.addAll(newItems);
+        diffResult.dispatchUpdatesTo(this);
+    }
+
+    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener {
+        final TextView tvName;
+        final TextView tvAddress;
+        final TextView tvAmount;
+        Subaddress item;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+            tvName = itemView.findViewById(R.id.tvName);
+            tvAddress = itemView.findViewById(R.id.tvAddress);
+            tvAmount = itemView.findViewById(R.id.tx_amount);
+            itemView.setOnClickListener(this);
+            itemView.setOnLongClickListener(this);
+        }
+
+        void bind(int position) {
+            item = getItem(position);
+            itemView.setTransitionName(context.getString(R.string.subaddress_item_transition_name, item.getAddressIndex()));
+
+            final String label = item.getDisplayLabel();
+            final String address = context.getString(R.string.subbaddress_info_subtitle,
+                    item.getAddressIndex(), item.getSquashedAddress());
+            tvName.setText(label.isEmpty() ? address : label);
+            tvAddress.setText(address);
+            final long amount = item.getAmount();
+            if (amount > 0)
+                tvAmount.setText(context.getString(R.string.tx_list_amount_positive,
+                        Helper.getDisplayAmount(amount, Helper.DISPLAY_DIGITS_INFO)));
+            else
+                tvAmount.setText("");
+        }
+
+        @Override
+        public void onClick(View view) {
+            if (listener != null) {
+                int position = getAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    listener.onInteraction(view, getItem(position));
+                }
+            }
+        }
+
+        @Override
+        public boolean onLongClick(View view) {
+            if (listener != null) {
+                int position = getAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    return listener.onLongInteraction(view, getItem(position));
+                }
+            }
+            return true;
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java

@@ -0,0 +1,278 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.layout;
+
+import android.content.Context;
+import android.text.Html;
+import android.text.Spanned;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.core.content.ContextCompat;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.google.android.material.progressindicator.CircularProgressIndicator;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.data.Crypto;
+import com.m2049r.xmrwallet.data.UserNotes;
+import com.m2049r.xmrwallet.model.TransactionInfo;
+import com.m2049r.xmrwallet.util.Helper;
+import com.m2049r.xmrwallet.util.ThemeHelper;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+import java.util.Objects;
+import java.util.TimeZone;
+
+import timber.log.Timber;
+
+public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfoAdapter.ViewHolder> {
+    private final static SimpleDateFormat DATETIME_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm");
+
+    private final int outboundColour;
+    private final int inboundColour;
+    private final int pendingColour;
+    private final int failedColour;
+
+    public interface OnInteractionListener {
+        void onInteraction(View view, TransactionInfo item);
+    }
+
+    private final List<TransactionInfo> infoItems;
+    private final OnInteractionListener listener;
+
+    private final Context context;
+
+    public TransactionInfoAdapter(Context context, OnInteractionListener listener) {
+        this.context = context;
+        inboundColour = ThemeHelper.getThemedColor(context, R.attr.positiveColor);
+        outboundColour = ThemeHelper.getThemedColor(context, R.attr.negativeColor);
+        pendingColour = ThemeHelper.getThemedColor(context, R.attr.neutralColor);
+        failedColour = ThemeHelper.getThemedColor(context, R.attr.neutralColor);
+        infoItems = new ArrayList<>();
+        this.listener = listener;
+        Calendar cal = Calendar.getInstance();
+        TimeZone tz = cal.getTimeZone(); //get the local time zone.
+        DATETIME_FORMATTER.setTimeZone(tz);
+    }
+
+    public boolean needsTransactionUpdateOnNewBlock() {
+        return (infoItems.size() > 0) && !infoItems.get(0).isConfirmed();
+    }
+
+    private static class TransactionInfoDiff extends DiffCallback<TransactionInfo> {
+
+        public TransactionInfoDiff(List<TransactionInfo> oldList, List<TransactionInfo> newList) {
+            super(oldList, newList);
+        }
+
+        @Override
+        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).hash.equals(mNewList.get(newItemPosition).hash);
+        }
+
+        @Override
+        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+            final TransactionInfo oldItem = mOldList.get(oldItemPosition);
+            final TransactionInfo newItem = mNewList.get(newItemPosition);
+            return (oldItem.direction == newItem.direction)
+                    && (oldItem.isPending == newItem.isPending)
+                    && (oldItem.isFailed == newItem.isFailed)
+                    && ((oldItem.confirmations == newItem.confirmations) || (oldItem.isConfirmed()))
+                    && (oldItem.subaddressLabel.equals(newItem.subaddressLabel))
+                    && (Objects.equals(oldItem.notes, newItem.notes));
+        }
+    }
+
+    @NonNull
+    @Override
+    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_transaction, parent, false);
+        return new ViewHolder(view);
+    }
+
+    @Override
+    public void onBindViewHolder(final ViewHolder holder, int position) {
+        holder.bind(position);
+    }
+
+    @Override
+    public int getItemCount() {
+        return infoItems.size();
+    }
+
+    public void setInfos(List<TransactionInfo> newItems) {
+        if (newItems == null) {
+            newItems = new ArrayList<>();
+            Timber.d("setInfos null");
+        } else {
+            Timber.d("setInfos %s", newItems.size());
+        }
+        Collections.sort(newItems);
+        final DiffCallback<TransactionInfo> diffCallback = new TransactionInfoAdapter.TransactionInfoDiff(infoItems, newItems);
+        final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
+        infoItems.clear();
+        infoItems.addAll(newItems);
+        diffResult.dispatchUpdatesTo(this);
+    }
+
+    public void removeItem(int position) {
+        List<TransactionInfo> newItems = new ArrayList<>(infoItems);
+        if (newItems.size() > position)
+            newItems.remove(position);
+        setInfos(newItems); // in case the nodeinfo has changed
+    }
+
+    public TransactionInfo getItem(int position) {
+        return infoItems.get(position);
+    }
+
+    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
+        final ImageView ivTxType;
+        final TextView tvAmount;
+        final TextView tvFailed;
+        final TextView tvPaymentId;
+        final TextView tvDateTime;
+        final CircularProgressIndicator pbConfirmations;
+        final TextView tvConfirmations;
+        TransactionInfo infoItem;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+            ivTxType = itemView.findViewById(R.id.ivTxType);
+            tvAmount = itemView.findViewById(R.id.tx_amount);
+            tvFailed = itemView.findViewById(R.id.tx_failed);
+            tvPaymentId = itemView.findViewById(R.id.tx_paymentid);
+            tvDateTime = itemView.findViewById(R.id.tx_datetime);
+            pbConfirmations = itemView.findViewById(R.id.pbConfirmations);
+            pbConfirmations.setMax(TransactionInfo.CONFIRMATION);
+            tvConfirmations = itemView.findViewById(R.id.tvConfirmations);
+        }
+
+        private String getDateTime(long time) {
+            return DATETIME_FORMATTER.format(new Date(time * 1000));
+        }
+
+        private void setTxColour(int clr) {
+            tvAmount.setTextColor(clr);
+        }
+
+        void bind(int position) {
+            infoItem = infoItems.get(position);
+            itemView.setTransitionName(context.getString(R.string.tx_item_transition_name, infoItem.hash));
+
+            UserNotes userNotes = new UserNotes(infoItem.notes);
+            if (userNotes.xmrtoKey != null) {
+                final Crypto crypto = Crypto.withSymbol(userNotes.xmrtoCurrency);
+                if (crypto != null) {
+                    ivTxType.setImageResource(crypto.getIconEnabledId());
+                    ivTxType.setVisibility(View.VISIBLE);
+                } else {// otherwirse pretend we don't know it's a shift
+                    ivTxType.setVisibility(View.GONE);
+                }
+            } else {
+                ivTxType.setVisibility(View.GONE);
+            }
+
+            String displayAmount = Helper.getDisplayAmount(infoItem.amount, Helper.DISPLAY_DIGITS_INFO);
+            if (infoItem.direction == TransactionInfo.Direction.Direction_Out) {
+                tvAmount.setText(context.getString(R.string.tx_list_amount_negative, displayAmount));
+            } else {
+                tvAmount.setText(context.getString(R.string.tx_list_amount_positive, displayAmount));
+            }
+
+            tvFailed.setVisibility(View.GONE);
+            if (infoItem.isFailed) {
+                this.tvAmount.setText(context.getString(R.string.tx_list_amount_failed, displayAmount));
+                tvFailed.setVisibility(View.VISIBLE);
+                setTxColour(failedColour);
+                pbConfirmations.setVisibility(View.GONE);
+                tvConfirmations.setVisibility(View.GONE);
+            } else if (infoItem.isPending) {
+                setTxColour(pendingColour);
+                pbConfirmations.setVisibility(View.GONE);
+                pbConfirmations.setIndeterminate(true);
+                pbConfirmations.setVisibility(View.VISIBLE);
+                tvConfirmations.setVisibility(View.GONE);
+            } else if (infoItem.direction == TransactionInfo.Direction.Direction_In) {
+                setTxColour(inboundColour);
+                if (!infoItem.isConfirmed()) {
+                    pbConfirmations.setVisibility(View.VISIBLE);
+                    final int confirmations = (int) infoItem.confirmations;
+                    pbConfirmations.setProgressCompat(confirmations, true);
+                    final String confCount = Integer.toString(confirmations);
+                    tvConfirmations.setText(confCount);
+                    if (confCount.length() == 1) // we only have space for character in the progress circle
+                        tvConfirmations.setVisibility(View.VISIBLE);
+                    else
+                        tvConfirmations.setVisibility(View.GONE);
+                } else {
+                    pbConfirmations.setVisibility(View.GONE);
+                    tvConfirmations.setVisibility(View.GONE);
+                }
+            } else {
+                setTxColour(outboundColour);
+                pbConfirmations.setVisibility(View.GONE);
+                tvConfirmations.setVisibility(View.GONE);
+            }
+
+            String tag = null;
+            String info = "";
+            if ((infoItem.addressIndex != 0) && (infoItem.direction == TransactionInfo.Direction.Direction_In))
+                tag = infoItem.getDisplayLabel();
+            if ((userNotes.note.isEmpty())) {
+                if (!infoItem.paymentId.equals("0000000000000000")) {
+                    info = infoItem.paymentId;
+                }
+            } else {
+                info = userNotes.note;
+            }
+            if (tag == null) {
+                tvPaymentId.setText(info);
+            } else {
+                Spanned label = Html.fromHtml(context.getString(R.string.tx_details_notes,
+                        Integer.toHexString(ThemeHelper.getThemedColor(context, R.attr.positiveColor) & 0xFFFFFF),
+                        Integer.toHexString(ThemeHelper.getThemedColor(context, android.R.attr.colorBackground) & 0xFFFFFF),
+                        tag, info.isEmpty() ? "" : ("&nbsp; " + info)));
+                tvPaymentId.setText(label);
+            }
+
+            this.tvDateTime.setText(getDateTime(infoItem.timestamp));
+
+            itemView.setOnClickListener(this);
+        }
+
+        @Override
+        public void onClick(View view) {
+            if (listener != null) {
+                int position = getAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    listener.onInteraction(view, infoItems.get(position));
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/layout/WalletInfoAdapter.java

@@ -0,0 +1,174 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.layout;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageButton;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.appcompat.widget.PopupMenu;
+import androidx.recyclerview.widget.DiffUtil;
+import androidx.recyclerview.widget.RecyclerView;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.model.WalletManager;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Collections;
+import java.util.Date;
+import java.util.List;
+import java.util.TimeZone;
+
+import timber.log.Timber;
+
+public class WalletInfoAdapter extends RecyclerView.Adapter<WalletInfoAdapter.ViewHolder> {
+
+    private final SimpleDateFormat DATETIME_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm");
+
+    public interface OnInteractionListener {
+        void onInteraction(View view, WalletManager.WalletInfo item);
+
+        boolean onContextInteraction(MenuItem item, WalletManager.WalletInfo infoItem);
+    }
+
+    private final List<WalletManager.WalletInfo> infoItems;
+    private final OnInteractionListener listener;
+
+    Context context;
+
+    public WalletInfoAdapter(Context context, OnInteractionListener listener) {
+        this.context = context;
+        this.infoItems = new ArrayList<>();
+        this.listener = listener;
+        Calendar cal = Calendar.getInstance();
+        TimeZone tz = cal.getTimeZone(); //get the local time zone.
+        DATETIME_FORMATTER.setTimeZone(tz);
+    }
+
+    private static class WalletInfoDiff extends DiffCallback<WalletManager.WalletInfo> {
+
+        public WalletInfoDiff(List<WalletManager.WalletInfo> oldList, List<WalletManager.WalletInfo> newList) {
+            super(oldList, newList);
+        }
+
+        @Override
+        public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).getName().equals(mNewList.get(newItemPosition).getName());
+        }
+
+        @Override
+        public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
+            return mOldList.get(oldItemPosition).compareTo(mNewList.get(newItemPosition)) == 0;
+        }
+    }
+
+    @NonNull
+    @Override
+    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        return new ViewHolder(
+                LayoutInflater.from(parent.getContext()).inflate(R.layout.item_wallet, parent, false)
+        );
+    }
+
+    @Override
+    public void onBindViewHolder(final ViewHolder holder, int position) {
+        holder.bind(position);
+    }
+
+    @Override
+    public int getItemCount() {
+        return infoItems.size();
+    }
+
+    public WalletManager.WalletInfo getItem(int position) {
+        return infoItems.get(position);
+    }
+
+    public void setInfos(List<WalletManager.WalletInfo> newItems) {
+        if (newItems == null) {
+            newItems = new ArrayList<>();
+            Timber.d("setInfos null");
+        } else {
+            Timber.d("setInfos %s", newItems.size());
+        }
+        Collections.sort(newItems);
+        final DiffCallback<WalletManager.WalletInfo> diffCallback = new WalletInfoAdapter.WalletInfoDiff(infoItems, newItems);
+        final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
+        infoItems.clear();
+        infoItems.addAll(newItems);
+        diffResult.dispatchUpdatesTo(this);
+    }
+
+    class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
+        final TextView tvName;
+        final ImageButton ibOptions;
+        WalletManager.WalletInfo infoItem;
+        boolean popupOpen = false;
+
+        ViewHolder(View itemView) {
+            super(itemView);
+            tvName = itemView.findViewById(R.id.tvName);
+            ibOptions = itemView.findViewById(R.id.ibOptions);
+            ibOptions.setOnClickListener(view -> {
+                if (popupOpen) return;
+                //creating a popup menu
+                PopupMenu popup = new PopupMenu(context, ibOptions);
+                //inflating menu from xml resource
+                popup.inflate(R.menu.list_context_menu);
+                popupOpen = true;
+                //adding click listener
+                popup.setOnMenuItemClickListener(item -> {
+                    if (listener != null) {
+                        return listener.onContextInteraction(item, infoItem);
+                    }
+                    return false;
+                });
+                //displaying the popup
+                popup.show();
+                popup.setOnDismissListener(menu -> popupOpen = false);
+
+            });
+            itemView.setOnClickListener(this);
+        }
+
+        private String getDateTime(long time) {
+            return DATETIME_FORMATTER.format(new Date(time * 1000));
+        }
+
+        void bind(int position) {
+            infoItem = infoItems.get(position);
+            tvName.setText(infoItem.getName());
+        }
+
+        @Override
+        public void onClick(View view) {
+            if (listener != null) {
+                int position = getAdapterPosition(); // gets item position
+                if (position != RecyclerView.NO_POSITION) { // Check if an item was deleted, but the user clicked it before the UI removed it
+                    listener.onInteraction(view, infoItems.get(position));
+                }
+            }
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/ledger/Instruction.java

@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.ledger;
+
+public enum Instruction {
+
+    INS_NONE(0x00),
+    INS_RESET(0x02),
+    INS_GET_KEY(0x20),
+    INS_DISPLAY_ADDRESS(0x21),
+    INS_PUT_KEY(0x22),
+    INS_GET_CHACHA8_PREKEY(0x24),
+    INS_VERIFY_KEY(0x26),
+    INS_MANAGE_SEEDWORDS(0x28),
+
+    INS_SECRET_KEY_TO_PUBLIC_KEY(0x30),
+    INS_GEN_KEY_DERIVATION(0x32),
+    INS_DERIVATION_TO_SCALAR(0x34),
+    INS_DERIVE_PUBLIC_KEY(0x36),
+    INS_DERIVE_SECRET_KEY(0x38),
+    INS_GEN_KEY_IMAGE(0x3A),
+
+    INS_SECRET_KEY_ADD(0x3C),
+    INS_SECRET_KEY_SUB(0x3E),
+    INS_GENERATE_KEYPAIR(0x40),
+    INS_SECRET_SCAL_MUL_KEY(0x42),
+    INS_SECRET_SCAL_MUL_BASE(0x44),
+
+    INS_DERIVE_SUBADDRESS_PUBLIC_KEY(0x46),
+    INS_GET_SUBADDRESS(0x48),
+    INS_GET_SUBADDRESS_SPEND_PUBLIC_KEY(0x4A),
+    INS_GET_SUBADDRESS_SECRET_KEY(0x4C),
+
+    INS_OPEN_TX(0x70),
+    INS_SET_SIGNATURE_MODE(0x72),
+    INS_GET_ADDITIONAL_KEY(0x74),
+    INS_STEALTH(0x76),
+    INS_GEN_COMMITMENT_MASK(0x77),
+    INS_BLIND(0x78),
+    INS_UNBLIND(0x7A),
+    INS_GEN_TXOUT_KEYS(0x7B),
+    INS_VALIDATE(0x7C),
+    INS_PREFIX_HASH(0x7D),
+    INS_MLSAG(0x7E),
+    INS_CLOSE_TX(0x80),
+
+    INS_GET_TX_PROOF(0xA0),
+
+    INS_GET_RESPONSE(0xC0),
+
+    INS_UNDEFINED(0xFF);
+
+    public static Instruction fromByte(byte n) {
+        switch (n & 0xFF) {
+            case 0x00:
+                return INS_NONE;
+            case 0x02:
+                return INS_RESET;
+
+            case 0x20:
+                return INS_GET_KEY;
+            case 0x22:
+                return INS_PUT_KEY;
+            case 0x24:
+                return INS_GET_CHACHA8_PREKEY;
+            case 0x26:
+                return INS_VERIFY_KEY;
+
+            case 0x30:
+                return INS_SECRET_KEY_TO_PUBLIC_KEY;
+            case 0x32:
+                return INS_GEN_KEY_DERIVATION;
+            case 0x34:
+                return INS_DERIVATION_TO_SCALAR;
+            case 0x36:
+                return INS_DERIVE_PUBLIC_KEY;
+            case 0x38:
+                return INS_DERIVE_SECRET_KEY;
+            case 0x3A:
+                return INS_GEN_KEY_IMAGE;
+            case 0x3C:
+                return INS_SECRET_KEY_ADD;
+            case 0x3E:
+                return INS_SECRET_KEY_SUB;
+            case 0x40:
+                return INS_GENERATE_KEYPAIR;
+            case 0x42:
+                return INS_SECRET_SCAL_MUL_KEY;
+            case 0x44:
+                return INS_SECRET_SCAL_MUL_BASE;
+
+            case 0x46:
+                return INS_DERIVE_SUBADDRESS_PUBLIC_KEY;
+            case 0x48:
+                return INS_GET_SUBADDRESS;
+            case 0x4A:
+                return INS_GET_SUBADDRESS_SPEND_PUBLIC_KEY;
+            case 0x4C:
+                return INS_GET_SUBADDRESS_SECRET_KEY;
+
+            case 0x70:
+                return INS_OPEN_TX;
+            case 0x72:
+                return INS_SET_SIGNATURE_MODE;
+            case 0x74:
+                return INS_GET_ADDITIONAL_KEY;
+            case 0x76:
+                return INS_STEALTH;
+            case 0x78:
+                return INS_BLIND;
+            case 0x7A:
+                return INS_UNBLIND;
+            case 0x7C:
+                return INS_VALIDATE;
+            case 0x7E:
+                return INS_MLSAG;
+            case 0x80:
+                return INS_CLOSE_TX;
+
+            case 0xc0:
+                return INS_GET_RESPONSE;
+
+            default:
+                return INS_UNDEFINED;
+        }
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+    public byte getByteValue() {
+        return (byte) (value & 0xFF);
+    }
+
+    private int value;
+
+    Instruction(int value) {
+        this.value = value;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/ledger/Ledger.java

@@ -0,0 +1,240 @@
+/*
+ *******************************************************************************
+ *   BTChip Bitcoin Hardware Wallet Java API
+ *   (c) 2014 BTChip - 1BTChip7VfTnrPra5jqci7ejnMguuHogTn
+ *   Copyright (c) 2018 m2049r
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *   Unless required by applicable law or agreed to in writing, software
+ *   distributed under the License is distributed on an "AS IS" BASIS,
+ *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *   limitations under the License.
+ ********************************************************************************
+ */
+
+package com.m2049r.xmrwallet.ledger;
+
+import android.hardware.usb.UsbDevice;
+import android.hardware.usb.UsbManager;
+
+import com.btchip.BTChipException;
+import com.btchip.comm.BTChipTransport;
+import com.btchip.comm.android.BTChipTransportAndroidHID;
+import com.m2049r.xmrwallet.BuildConfig;
+import com.m2049r.xmrwallet.model.WalletManager;
+import com.m2049r.xmrwallet.util.Helper;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+
+import timber.log.Timber;
+
+public class Ledger {
+    static final public boolean ENABLED = true;
+    // 5:20 is same as wallet2.cpp::restore()
+    static public final int LOOKAHEAD_ACCOUNTS = 5;
+    static public final int LOOKAHEAD_SUBADDRESSES = 20;
+    static public final String SUBADDRESS_LOOKAHEAD = LOOKAHEAD_ACCOUNTS + ":" + LOOKAHEAD_SUBADDRESSES;
+
+    private static final byte PROTOCOL_VERSION = 0x03;
+    public static final int SW_OK = 0x9000;
+    public static final int SW_INS_NOT_SUPPORTED = 0x6D00;
+    public static final int OK[] = {SW_OK};
+    public static final int MINIMUM_LEDGER_VERSION = (1 << 16) + (8 << 8) + (0); // 1.6.0
+
+    public static UsbDevice findDevice(UsbManager usbManager) {
+        if (!ENABLED) return null;
+        return BTChipTransportAndroidHID.getDevice(usbManager);
+    }
+
+    static private Ledger Instance = null;
+
+    static public String connect(UsbManager usbManager, UsbDevice usbDevice) throws IOException {
+        if (Instance != null) {
+            disconnect();
+        }
+        Instance = new Ledger(usbManager, usbDevice);
+        return Name();
+    }
+
+    static public void disconnect() {
+        // this is not synchronized so as to close immediately
+        if (Instance != null) {
+            Instance.close();
+            Instance = null;
+        }
+    }
+
+    static public boolean isConnected() {
+        //TODO synchronize with connect/disconnect?
+        return Instance != null;
+    }
+
+    static public String Name() {
+        if (Instance != null) {
+            return Instance.name;
+        } else {
+            return null;
+        }
+    }
+
+    static public byte[] Exchange(byte[] apdu) {
+        if (Instance != null) {
+            Timber.d("INS: %s", Instruction.fromByte(apdu[1]));
+            return Instance.exchangeRaw(apdu);
+        } else {
+            return null;
+        }
+    }
+
+    static public boolean check() {
+        if (Instance == null) return false;
+        byte[] moneroVersion = WalletManager.moneroVersion().getBytes(StandardCharsets.US_ASCII);
+
+        try {
+            byte[] resp = Instance.exchangeApduNoOpt(Instruction.INS_RESET, moneroVersion, OK);
+            int deviceVersion = (resp[0] << 16) + (resp[1] << 8) + (resp[2]);
+            if (deviceVersion < MINIMUM_LEDGER_VERSION)
+                return false;
+        } catch (BTChipException ex) { // comm error - probably wrong app started on device
+            return false;
+        }
+        return true;
+    }
+
+    final private BTChipTransport transport;
+    final private String name;
+    private int lastSW = 0;
+
+    private Ledger(UsbManager usbManager, UsbDevice usbDevice) throws IOException {
+        final BTChipTransport transport = BTChipTransportAndroidHID.open(usbManager, usbDevice);
+        Timber.d("transport opened = %s", transport.toString());
+        transport.setDebug(BuildConfig.DEBUG);
+        this.transport = transport;
+        this.name = usbDevice.getManufacturerName() + " " + usbDevice.getProductName();
+        initKey();
+    }
+
+    synchronized private void close() {
+        initKey(); // don't leak key after we disconnect
+        transport.close();
+        Timber.d("transport closed");
+        lastSW = 0;
+    }
+
+    synchronized private byte[] exchangeRaw(byte[] apdu) {
+        if (transport == null)
+            throw new IllegalStateException("No transport (probably closed previously)");
+        Timber.d("exchangeRaw %02x", apdu[1]);
+        Instruction ins = Instruction.fromByte(apdu[1]);
+        if (listener != null) listener.onInstructionSend(ins, apdu);
+        sniffOut(ins, apdu);
+        byte[] data = transport.exchange(apdu);
+        if (listener != null) listener.onInstructionReceive(ins, data);
+        sniffIn(data);
+        return data;
+    }
+
+    private byte[] exchange(byte[] apdu) throws BTChipException {
+        byte[] response = exchangeRaw(apdu);
+        if (response.length < 2) {
+            throw new BTChipException("Truncated response");
+        }
+        lastSW = ((response[response.length - 2] & 0xff) << 8) |
+                response[response.length - 1] & 0xff;
+        byte[] result = new byte[response.length - 2];
+        System.arraycopy(response, 0, result, 0, response.length - 2);
+        return result;
+    }
+
+    private byte[] exchangeCheck(byte[] apdu, int acceptedSW[]) throws BTChipException {
+        byte[] response = exchange(apdu);
+        if (acceptedSW == null) {
+            return response;
+        }
+        for (int SW : acceptedSW) {
+            if (lastSW == SW) {
+                return response;
+            }
+        }
+        throw new BTChipException("Invalid status", lastSW);
+    }
+
+    private byte[] exchangeApduNoOpt(Instruction instruction, byte[] data, int acceptedSW[])
+            throws BTChipException {
+        byte[] apdu = new byte[data.length + 6];
+        apdu[0] = PROTOCOL_VERSION;
+        apdu[1] = instruction.getByteValue();
+        apdu[2] = 0; // p1
+        apdu[3] = 0; // p2
+        apdu[4] = (byte) (data.length + 1); // +1 because the opt byte is part of the data
+        apdu[5] = 0; // opt
+        System.arraycopy(data, 0, apdu, 6, data.length);
+        return exchangeCheck(apdu, acceptedSW);
+    }
+
+    public interface Listener {
+        void onInstructionSend(Instruction ins, byte[] apdu);
+
+        void onInstructionReceive(Instruction ins, byte[] data);
+    }
+
+    Listener listener;
+
+    static public void setListener(Listener listener) {
+        if (Instance != null) {
+            Instance.listener = listener;
+        }
+    }
+
+    static public void unsetListener(Listener listener) {
+        if ((Instance != null) && (Instance.listener == listener))
+            Instance.listener = null;
+    }
+
+    // very stupid hack to extract the view key
+    // without messing around with monero core code
+    // NB: as all the ledger comm can be sniffed off the USB cable - there is no security issue here
+    private boolean snoopKey = false;
+    private byte[] key;
+
+    private void initKey() {
+        key = Helper.hexToBytes("0000000000000000000000000000000000000000000000000000000000000000");
+    }
+
+    static public String Key() {
+        if (Instance != null) {
+            return Helper.bytesToHex(Instance.key).toLowerCase();
+        } else {
+            return null;
+        }
+    }
+
+    private void sniffOut(Instruction ins, byte[] apdu) {
+        if (ins == Instruction.INS_GET_KEY) {
+            snoopKey = (apdu[2] == 2);
+        }
+    }
+
+    private void sniffIn(byte[] data) {
+        // stupid hack to extract the view key
+        // without messing around with monero core code
+        if (snoopKey) {
+            if (data.length == 34) { // 32 key + result code 9000
+                long sw = ((data[data.length - 2] & 0xff) << 8) |
+                        (data[data.length - 1] & 0xff);
+                Timber.e("WS %d", sw);
+                if (sw == SW_OK) {
+                    System.arraycopy(data, 0, key, 0, 32);
+                }
+            }
+            snoopKey = false;
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/ledger/LedgerProgressDialog.java

@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.ledger;
+
+import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.dialog.ProgressDialog;
+
+import timber.log.Timber;
+
+public class LedgerProgressDialog extends ProgressDialog implements Ledger.Listener {
+
+    static public final int TYPE_DEBUG = 0;
+    static public final int TYPE_RESTORE = 1;
+    static public final int TYPE_SUBADDRESS = 2;
+    static public final int TYPE_ACCOUNT = 3;
+    static public final int TYPE_SEND = 4;
+
+    private final int type;
+    private Handler uiHandler = new Handler(Looper.getMainLooper());
+
+    public LedgerProgressDialog(Context context, int type) {
+        super(context);
+        this.type = type;
+        setCancelable(false);
+        if (type == TYPE_SEND)
+            setMessage(context.getString(R.string.info_prepare_tx));
+        else
+            setMessage(context.getString(R.string.progress_ledger_progress));
+    }
+
+    @Override
+    public void onBackPressed() {
+        // prevent back button
+    }
+
+    private int firstSubaddress = Integer.MAX_VALUE;
+
+    private boolean validate = false;
+    private boolean validated = false;
+
+    @Override
+    public void onInstructionSend(final Instruction ins, final byte[] apdu) {
+        Timber.d("LedgerProgressDialog SEND %s", ins);
+        uiHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                if (type > TYPE_DEBUG) {
+                    validate = false;
+                    switch (ins) {
+                        case INS_RESET: // ledger may ask for confirmation - maybe a bug?
+                        case INS_GET_KEY: // ledger asks for confirmation to send keys
+                        case INS_DISPLAY_ADDRESS:
+                            setIndeterminate(true);
+                            setMessage(getContext().getString(R.string.progress_ledger_confirm));
+                            break;
+                        case INS_GET_SUBADDRESS_SPEND_PUBLIC_KEY: // lookahead
+                            //00 4a 00 00 09 00 01000000 30000000
+                            // 0  1  2  3  4  5  6 7 8 9  a b c d
+                            int account = bytesToInteger(apdu, 6);
+                            int subaddress = bytesToInteger(apdu, 10);
+                            Timber.d("fetching subaddress (%d, %d)", account, subaddress);
+                            switch (type) {
+                                case TYPE_RESTORE:
+                                    setProgress(account * Ledger.LOOKAHEAD_SUBADDRESSES + subaddress + 1,
+                                            Ledger.LOOKAHEAD_ACCOUNTS * Ledger.LOOKAHEAD_SUBADDRESSES);
+                                    setIndeterminate(false);
+                                    break;
+                                case TYPE_ACCOUNT:
+                                    final int requestedSubaddress = account * Ledger.LOOKAHEAD_SUBADDRESSES + subaddress;
+                                    if (firstSubaddress > requestedSubaddress) {
+                                        firstSubaddress = requestedSubaddress;
+                                    }
+                                    setProgress(requestedSubaddress - firstSubaddress + 1,
+                                            Ledger.LOOKAHEAD_ACCOUNTS * Ledger.LOOKAHEAD_SUBADDRESSES);
+                                    setIndeterminate(false);
+                                    break;
+                                case TYPE_SUBADDRESS:
+                                    if (firstSubaddress > subaddress) {
+                                        firstSubaddress = subaddress;
+                                    }
+                                    setProgress(subaddress - firstSubaddress + 1, Ledger.LOOKAHEAD_SUBADDRESSES);
+                                    setIndeterminate(false);
+                                    break;
+                                default:
+                                    setIndeterminate(true);
+                                    break;
+                            }
+                            setMessage(getContext().getString(R.string.progress_ledger_lookahead));
+                            break;
+                        case INS_VERIFY_KEY:
+                            setIndeterminate(true);
+                            setMessage(getContext().getString(R.string.progress_ledger_verify));
+                            break;
+                        case INS_OPEN_TX:
+                            setIndeterminate(true);
+                            setMessage(getContext().getString(R.string.progress_ledger_opentx));
+                            break;
+                        case INS_MLSAG:
+                            if (validated) {
+                                setIndeterminate(true);
+                                setMessage(getContext().getString(R.string.progress_ledger_mlsag));
+                            }
+                            break;
+                        case INS_PREFIX_HASH:
+                            if ((apdu[2] != 1) || (apdu[3] != 0)) break;
+                            setIndeterminate(true);
+                            setMessage(getContext().getString(R.string.progress_ledger_confirm));
+                            break;
+                        case INS_VALIDATE:
+                            if ((apdu[2] != 1) || (apdu[3] != 1)) break;
+                            validate = true;
+                            uiHandler.postDelayed(new Runnable() {
+                                @Override
+                                public void run() {
+                                    if (validate) {
+                                        setIndeterminate(true);
+                                        setMessage(getContext().getString(R.string.progress_ledger_confirm));
+                                        validated = true;
+                                    }
+                                }
+                            }, 250);
+                            break;
+                        default:
+                            // ignore others and maintain state
+                    }
+                } else {
+                    setMessage(ins.name());
+                }
+            }
+        });
+    }
+
+    @Override
+    public void onInstructionReceive(final Instruction ins, final byte[] data) {
+        Timber.d("LedgerProgressDialog RECV %s", ins);
+        uiHandler.post(new Runnable() {
+            @Override
+            public void run() {
+                if (type > TYPE_DEBUG) {
+                    switch (ins) {
+                        case INS_GET_SUBADDRESS_SPEND_PUBLIC_KEY: // lookahead
+                        case INS_VERIFY_KEY:
+                        case INS_GET_CHACHA8_PREKEY:
+                            break;
+                        default:
+                            if (type != TYPE_SEND)
+                                setMessage(getContext().getString(R.string.progress_ledger_progress));
+                    }
+                } else {
+                    setMessage("Returned from " + ins.name());
+                }
+            }
+        });
+    }
+
+    // TODO: we use ints in Java but the are signed; accounts & subaddresses are unsigned ...
+    private int bytesToInteger(byte[] bytes, int offset) {
+        int result = 0;
+        for (int i = 3; i >= 0; i--) {
+            result <<= 8;
+            result |= (bytes[offset + i] & 0xFF);
+        }
+        return result;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/model/NetworkType.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2018 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+public enum NetworkType {
+    NetworkType_Mainnet(0),
+    NetworkType_Testnet(1),
+    NetworkType_Stagenet(2);
+
+    public static NetworkType fromInteger(int n) {
+        switch (n) {
+            case 0:
+                return NetworkType_Mainnet;
+            case 1:
+                return NetworkType_Testnet;
+            case 2:
+                return NetworkType_Stagenet;
+        }
+        return null;
+    }
+
+    public int getValue() {
+        return value;
+    }
+
+    private int value;
+
+    NetworkType(int value) {
+        this.value = value;
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/model/PendingTransaction.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+public class PendingTransaction {
+    static {
+        System.loadLibrary("monerujo");
+    }
+
+    public long handle;
+
+    PendingTransaction(long handle) {
+        this.handle = handle;
+    }
+
+    public enum Status {
+        Status_Ok,
+        Status_Error,
+        Status_Critical
+    }
+
+    public enum Priority {
+        Priority_Default(0),
+        Priority_Low(1),
+        Priority_Medium(2),
+        Priority_High(3),
+        Priority_Last(4);
+
+        public static Priority fromInteger(int n) {
+            switch (n) {
+                case 0:
+                    return Priority_Default;
+                case 1:
+                    return Priority_Low;
+                case 2:
+                    return Priority_Medium;
+                case 3:
+                    return Priority_High;
+            }
+            return null;
+        }
+
+        public int getValue() {
+            return value;
+        }
+
+        private int value;
+
+        Priority(int value) {
+            this.value = value;
+        }
+
+
+    }
+
+    public Status getStatus() {
+        return Status.values()[getStatusJ()];
+    }
+
+    public native int getStatusJ();
+
+    public native String getErrorString();
+
+    // commit transaction or save to file if filename is provided.
+    public native boolean commit(String filename, boolean overwrite);
+
+    public native long getAmount();
+
+    public native long getDust();
+
+    public native long getFee();
+
+    public String getFirstTxId() {
+        String id = getFirstTxIdJ();
+        if (id == null)
+            throw new IndexOutOfBoundsException();
+        return id;
+    }
+
+    public native String getFirstTxIdJ();
+
+    public native long getTxCount();
+
+}

app/src/main/java/com/m2049r/xmrwallet/model/TransactionHistory.java

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import timber.log.Timber;
+
+public class TransactionHistory {
+    static {
+        System.loadLibrary("monerujo");
+    }
+
+    private long handle;
+
+    int accountIndex;
+
+    public void setAccountFor(Wallet wallet) {
+        if (accountIndex != wallet.getAccountIndex()) {
+            this.accountIndex = wallet.getAccountIndex();
+            refreshWithNotes(wallet);
+        }
+    }
+
+    public TransactionHistory(long handle, int accountIndex) {
+        this.handle = handle;
+        this.accountIndex = accountIndex;
+    }
+
+    private void loadNotes(Wallet wallet) {
+        for (TransactionInfo info : transactions) {
+            info.notes = wallet.getUserNote(info.hash);
+        }
+    }
+
+    public native int getCount(); // over all accounts/subaddresses
+
+    //private native long getTransactionByIndexJ(int i);
+
+    //private native long getTransactionByIdJ(String id);
+
+    public List<TransactionInfo> getAll() {
+        return transactions;
+    }
+
+    private List<TransactionInfo> transactions = new ArrayList<>();
+
+    void refreshWithNotes(Wallet wallet) {
+        refresh();
+        loadNotes(wallet);
+    }
+
+    private void refresh() {
+        List<TransactionInfo> transactionInfos = refreshJ();
+        Timber.d("refresh size=%d", transactionInfos.size());
+        for (Iterator<TransactionInfo> iterator = transactionInfos.iterator(); iterator.hasNext(); ) {
+            TransactionInfo info = iterator.next();
+            if (info.accountIndex != accountIndex) {
+                iterator.remove();
+            }
+        }
+        transactions = transactionInfos;
+    }
+
+    private native List<TransactionInfo> refreshJ();
+}

app/src/main/java/com/m2049r/xmrwallet/model/TransactionInfo.java

@@ -0,0 +1,186 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import com.m2049r.xmrwallet.data.Subaddress;
+
+import java.util.List;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+// this is not the TransactionInfo from the API as that is owned by the TransactionHistory
+// this is a POJO for the TransactionInfoAdapter
+public class TransactionInfo implements Parcelable, Comparable<TransactionInfo> {
+    public static final int CONFIRMATION = 10; // blocks
+
+    @RequiredArgsConstructor
+    public enum Direction {
+        Direction_In(0),
+        Direction_Out(1);
+
+        public static Direction fromInteger(int n) {
+            switch (n) {
+                case 0:
+                    return Direction_In;
+                case 1:
+                    return Direction_Out;
+            }
+            return null;
+        }
+
+        @Getter
+        private final int value;
+    }
+
+    public Direction direction;
+    public boolean isPending;
+    public boolean isFailed;
+    public long amount;
+    public long fee;
+    public long blockheight;
+    public String hash;
+    public long timestamp;
+    public String paymentId;
+    public int accountIndex;
+    public int addressIndex;
+    public long confirmations;
+    public String subaddressLabel;
+    public List<Transfer> transfers;
+
+    public String txKey = null;
+    public String notes = null;
+    public String address = null;
+
+    public TransactionInfo(
+            int direction,
+            boolean isPending,
+            boolean isFailed,
+            long amount,
+            long fee,
+            long blockheight,
+            String hash,
+            long timestamp,
+            String paymentId,
+            int accountIndex,
+            int addressIndex,
+            long confirmations,
+            String subaddressLabel,
+            List<Transfer> transfers) {
+        this.direction = Direction.values()[direction];
+        this.isPending = isPending;
+        this.isFailed = isFailed;
+        this.amount = amount;
+        this.fee = fee;
+        this.blockheight = blockheight;
+        this.hash = hash;
+        this.timestamp = timestamp;
+        this.paymentId = paymentId;
+        this.accountIndex = accountIndex;
+        this.addressIndex = addressIndex;
+        this.confirmations = confirmations;
+        this.subaddressLabel = subaddressLabel;
+        this.transfers = transfers;
+    }
+
+    public boolean isConfirmed() {
+        return confirmations >= CONFIRMATION;
+    }
+
+    public String getDisplayLabel() {
+        if (subaddressLabel.isEmpty() || (Subaddress.DEFAULT_LABEL_FORMATTER.matcher(subaddressLabel).matches()))
+            return ("#" + addressIndex);
+        else
+            return subaddressLabel;
+    }
+
+    public String toString() {
+        return direction + "@" + blockheight + " " + amount;
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeInt(direction.getValue());
+        out.writeByte((byte) (isPending ? 1 : 0));
+        out.writeByte((byte) (isFailed ? 1 : 0));
+        out.writeLong(amount);
+        out.writeLong(fee);
+        out.writeLong(blockheight);
+        out.writeString(hash);
+        out.writeLong(timestamp);
+        out.writeString(paymentId);
+        out.writeInt(accountIndex);
+        out.writeInt(addressIndex);
+        out.writeLong(confirmations);
+        out.writeString(subaddressLabel);
+        out.writeList(transfers);
+        out.writeString(txKey);
+        out.writeString(notes);
+        out.writeString(address);
+    }
+
+    public static final Parcelable.Creator<TransactionInfo> CREATOR = new Parcelable.Creator<TransactionInfo>() {
+        public TransactionInfo createFromParcel(Parcel in) {
+            return new TransactionInfo(in);
+        }
+
+        public TransactionInfo[] newArray(int size) {
+            return new TransactionInfo[size];
+        }
+    };
+
+    private TransactionInfo(Parcel in) {
+        direction = Direction.fromInteger(in.readInt());
+        isPending = in.readByte() != 0;
+        isFailed = in.readByte() != 0;
+        amount = in.readLong();
+        fee = in.readLong();
+        blockheight = in.readLong();
+        hash = in.readString();
+        timestamp = in.readLong();
+        paymentId = in.readString();
+        accountIndex = in.readInt();
+        addressIndex = in.readInt();
+        confirmations = in.readLong();
+        subaddressLabel = in.readString();
+        transfers = in.readArrayList(Transfer.class.getClassLoader());
+        txKey = in.readString();
+        notes = in.readString();
+        address = in.readString();
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public int compareTo(TransactionInfo another) {
+        long b1 = this.timestamp;
+        long b2 = another.timestamp;
+        if (b1 > b2) {
+            return -1;
+        } else if (b1 < b2) {
+            return 1;
+        } else {
+            return this.hash.compareTo(another.hash);
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/model/Transfer.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+public class Transfer implements Parcelable {
+    public long amount;
+    public String address;
+
+    public Transfer(long amount, String address) {
+        this.amount = amount;
+        this.address = address;
+    }
+
+    @Override
+    public void writeToParcel(Parcel out, int flags) {
+        out.writeLong(amount);
+        out.writeString(address);
+    }
+
+    public static final Parcelable.Creator<Transfer> CREATOR = new Parcelable.Creator<Transfer>() {
+        public Transfer createFromParcel(Parcel in) {
+            return new Transfer(in);
+        }
+
+        public Transfer[] newArray(int size) {
+            return new Transfer[size];
+        }
+    };
+
+    private Transfer(Parcel in) {
+        amount = in.readLong();
+        address = in.readString();
+    }
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+}

app/src/main/java/com/m2049r/xmrwallet/model/Wallet.java

@@ -0,0 +1,507 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.m2049r.xmrwallet.data.Subaddress;
+import com.m2049r.xmrwallet.data.TxData;
+
+import java.io.File;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.Locale;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import timber.log.Timber;
+
+public class Wallet {
+    final static public long SWEEP_ALL = Long.MAX_VALUE;
+
+    static {
+        System.loadLibrary("monerujo");
+    }
+
+    static public class Status {
+        Status(int status, String errorString) {
+            this.status = StatusEnum.values()[status];
+            this.errorString = errorString;
+        }
+
+        final private StatusEnum status;
+        final private String errorString;
+        @Nullable
+        private ConnectionStatus connectionStatus; // optional
+
+        public StatusEnum getStatus() {
+            return status;
+        }
+
+        public String getErrorString() {
+            return errorString;
+        }
+
+        public void setConnectionStatus(@Nullable ConnectionStatus connectionStatus) {
+            this.connectionStatus = connectionStatus;
+        }
+
+        @Nullable
+        public ConnectionStatus getConnectionStatus() {
+            return connectionStatus;
+        }
+
+        public boolean isOk() {
+            return (getStatus() == StatusEnum.Status_Ok)
+                    && ((getConnectionStatus() == null) ||
+                    (getConnectionStatus() == ConnectionStatus.ConnectionStatus_Connected));
+        }
+
+        @Override
+        @NonNull
+        public String toString() {
+            return "Wallet.Status: " + status + "/" + errorString + "/" + connectionStatus;
+        }
+    }
+
+    private int accountIndex = 0;
+
+    public int getAccountIndex() {
+        return accountIndex;
+    }
+
+    public void setAccountIndex(int accountIndex) {
+        Timber.d("setAccountIndex(%d)", accountIndex);
+        this.accountIndex = accountIndex;
+        getHistory().setAccountFor(this);
+    }
+
+    public String getName() {
+        return new File(getPath()).getName();
+    }
+
+    private long handle = 0;
+    private long listenerHandle = 0;
+
+    Wallet(long handle) {
+        this.handle = handle;
+    }
+
+    Wallet(long handle, int accountIndex) {
+        this.handle = handle;
+        this.accountIndex = accountIndex;
+    }
+
+    @RequiredArgsConstructor
+    @Getter
+    public enum Device {
+        Device_Undefined(0, 0),
+        Device_Software(50, 200),
+        Device_Ledger(5, 20);
+        private final int accountLookahead;
+        private final int subaddressLookahead;
+    }
+
+    public enum StatusEnum {
+        Status_Ok,
+        Status_Error,
+        Status_Critical
+    }
+
+    public enum ConnectionStatus {
+        ConnectionStatus_Disconnected,
+        ConnectionStatus_Connected,
+        ConnectionStatus_WrongVersion
+    }
+
+    public native String getSeed(String offset);
+
+    public native String getSeedLanguage();
+
+    public native void setSeedLanguage(String language);
+
+    public Status getStatus() {
+        return statusWithErrorString();
+    }
+
+    public Status getFullStatus() {
+        Wallet.Status walletStatus = statusWithErrorString();
+        walletStatus.setConnectionStatus(getConnectionStatus());
+        return walletStatus;
+    }
+
+    private native Status statusWithErrorString();
+
+    public native synchronized boolean setPassword(String password);
+
+    public String getAddress() {
+        return getAddress(accountIndex);
+    }
+
+    public String getAddress(int accountIndex) {
+        return getAddressJ(accountIndex, 0);
+    }
+
+    public String getSubaddress(int addressIndex) {
+        return getAddressJ(accountIndex, addressIndex);
+    }
+
+    public String getSubaddress(int accountIndex, int addressIndex) {
+        return getAddressJ(accountIndex, addressIndex);
+    }
+
+    private native String getAddressJ(int accountIndex, int addressIndex);
+
+    public Subaddress getSubaddressObject(int accountIndex, int subAddressIndex) {
+        return new Subaddress(accountIndex, subAddressIndex,
+                getSubaddress(subAddressIndex), getSubaddressLabel(subAddressIndex));
+    }
+
+    public Subaddress getSubaddressObject(int subAddressIndex) {
+        Subaddress subaddress = getSubaddressObject(accountIndex, subAddressIndex);
+        long amount = 0;
+        for (TransactionInfo info : getHistory().getAll()) {
+            if ((info.addressIndex == subAddressIndex)
+                    && (info.direction == TransactionInfo.Direction.Direction_In)) {
+                amount += info.amount;
+            }
+        }
+        subaddress.setAmount(amount);
+        return subaddress;
+    }
+
+    public native String getPath();
+
+    public NetworkType getNetworkType() {
+        return NetworkType.fromInteger(nettype());
+    }
+
+    public native int nettype();
+
+//TODO virtual void hardForkInfo(uint8_t &version, uint64_t &earliest_height) const = 0;
+//TODO virtual bool useForkRules(uint8_t version, int64_t early_blocks) const = 0;
+
+    public native String getIntegratedAddress(String payment_id);
+
+    public native String getSecretViewKey();
+
+    public native String getSecretSpendKey();
+
+    public boolean store() {
+        return store("");
+    }
+
+    public native synchronized boolean store(String path);
+
+    public boolean close() {
+        disposePendingTransaction();
+        return WalletManager.getInstance().close(this);
+    }
+
+    public native String getFilename();
+
+    //    virtual std::string keysFilename() const = 0;
+    public boolean init(long upper_transaction_size_limit) {
+        return initJ(WalletManager.getInstance().getDaemonAddress(), upper_transaction_size_limit,
+                WalletManager.getInstance().getDaemonUsername(),
+                WalletManager.getInstance().getDaemonPassword());
+    }
+
+    private native boolean initJ(String daemon_address, long upper_transaction_size_limit,
+                                 String daemon_username, String daemon_password);
+
+//    virtual bool createWatchOnly(const std::string &path, const std::string &password, const std::string &language) const = 0;
+//    virtual void setRefreshFromBlockHeight(uint64_t refresh_from_block_height) = 0;
+
+    public native void setRestoreHeight(long height);
+
+    public native long getRestoreHeight();
+
+    //    virtual void setRecoveringFromSeed(bool recoveringFromSeed) = 0;
+//    virtual bool connectToDaemon() = 0;
+
+    public ConnectionStatus getConnectionStatus() {
+        int s = getConnectionStatusJ();
+        return Wallet.ConnectionStatus.values()[s];
+    }
+
+    private native int getConnectionStatusJ();
+
+//TODO virtual void setTrustedDaemon(bool arg) = 0;
+//TODO virtual bool trustedDaemon() const = 0;
+
+    public native boolean setProxy(String address);
+
+    public long getBalance() {
+        return getBalance(accountIndex);
+    }
+
+    public native long getBalance(int accountIndex);
+
+    public native long getBalanceAll();
+
+    public long getUnlockedBalance() {
+        return getUnlockedBalance(accountIndex);
+    }
+
+    public native long getUnlockedBalanceAll();
+
+    public native long getUnlockedBalance(int accountIndex);
+
+    public native boolean isWatchOnly();
+
+    public native long getBlockChainHeight();
+
+    public native long getApproximateBlockChainHeight();
+
+    public native long getDaemonBlockChainHeight();
+
+    public native long getDaemonBlockChainTargetHeight();
+
+    boolean synced = false;
+
+    public boolean isSynchronized() {
+        return synced;
+    }
+
+    public void setSynchronized() {
+        this.synced = true;
+    }
+
+    public static native String getDisplayAmount(long amount);
+
+    public static native long getAmountFromString(String amount);
+
+    public static native long getAmountFromDouble(double amount);
+
+    public static native String generatePaymentId();
+
+    public static native boolean isPaymentIdValid(String payment_id);
+
+    public static boolean isAddressValid(String address) {
+        return isAddressValid(address, WalletManager.getInstance().getNetworkType().getValue());
+    }
+
+    public static native boolean isAddressValid(String address, int networkType);
+
+    public static native String getPaymentIdFromAddress(String address, int networkType);
+
+    public static native long getMaximumAllowedAmount();
+
+    public native void startRefresh();
+
+    public native void pauseRefresh();
+
+    public native boolean refresh();
+
+    public native void refreshAsync();
+
+    public native void rescanBlockchainAsyncJ();
+
+    public void rescanBlockchainAsync() {
+        synced = false;
+        rescanBlockchainAsyncJ();
+    }
+
+//TODO virtual void setAutoRefreshInterval(int millis) = 0;
+//TODO virtual int autoRefreshInterval() const = 0;
+
+
+    private PendingTransaction pendingTransaction = null;
+
+    public PendingTransaction getPendingTransaction() {
+        return pendingTransaction;
+    }
+
+    public void disposePendingTransaction() {
+        if (pendingTransaction != null) {
+            disposeTransaction(pendingTransaction);
+            pendingTransaction = null;
+        }
+    }
+
+    public PendingTransaction createTransaction(TxData txData) {
+        return createTransaction(
+                txData.getDestinationAddress(),
+                txData.getAmount(),
+                txData.getMixin(),
+                txData.getPriority());
+    }
+
+    public PendingTransaction createTransaction(String dst_addr,
+                                                long amount, int mixin_count,
+                                                PendingTransaction.Priority priority) {
+        disposePendingTransaction();
+        int _priority = priority.getValue();
+        long txHandle =
+                (amount == SWEEP_ALL ?
+                        createSweepTransaction(dst_addr, "", mixin_count, _priority,
+                                accountIndex) :
+                        createTransactionJ(dst_addr, "", amount, mixin_count, _priority,
+                                accountIndex));
+        pendingTransaction = new PendingTransaction(txHandle);
+        return pendingTransaction;
+    }
+
+    private native long createTransactionJ(String dst_addr, String payment_id,
+                                           long amount, int mixin_count,
+                                           int priority, int accountIndex);
+
+    private native long createSweepTransaction(String dst_addr, String payment_id,
+                                               int mixin_count,
+                                               int priority, int accountIndex);
+
+
+    public PendingTransaction createSweepUnmixableTransaction() {
+        disposePendingTransaction();
+        long txHandle = createSweepUnmixableTransactionJ();
+        pendingTransaction = new PendingTransaction(txHandle);
+        return pendingTransaction;
+    }
+
+    private native long createSweepUnmixableTransactionJ();
+
+//virtual UnsignedTransaction * loadUnsignedTx(const std::string &unsigned_filename) = 0;
+//virtual bool submitTransaction(const std::string &fileName) = 0;
+
+    public native void disposeTransaction(PendingTransaction pendingTransaction);
+
+//virtual bool exportKeyImages(const std::string &filename) = 0;
+//virtual bool importKeyImages(const std::string &filename) = 0;
+
+
+//virtual TransactionHistory * history() const = 0;
+
+    private TransactionHistory history = null;
+
+    public TransactionHistory getHistory() {
+        if (history == null) {
+            history = new TransactionHistory(getHistoryJ(), accountIndex);
+        }
+        return history;
+    }
+
+    private native long getHistoryJ();
+
+    public void refreshHistory() {
+        getHistory().refreshWithNotes(this);
+    }
+
+//virtual AddressBook * addressBook() const = 0;
+//virtual void setListener(WalletListener *) = 0;
+
+    private native long setListenerJ(WalletListener listener);
+
+    public void setListener(WalletListener listener) {
+        this.listenerHandle = setListenerJ(listener);
+    }
+
+    public native int getDefaultMixin();
+
+    public native void setDefaultMixin(int mixin);
+
+    public native boolean setUserNote(String txid, String note);
+
+    public native String getUserNote(String txid);
+
+    public native String getTxKey(String txid);
+
+//virtual std::string signMessage(const std::string &message) = 0;
+//virtual bool verifySignedMessage(const std::string &message, const std::string &addres, const std::string &signature) const = 0;
+
+//virtual bool parse_uri(const std::string &uri, std::string &address, std::string &payment_id, uint64_t &tvAmount, std::string &tx_description, std::string &recipient_name, std::vector<std::string> &unknown_parameters, std::string &error) = 0;
+//virtual bool rescanSpent() = 0;
+
+    private static final String NEW_ACCOUNT_NAME = "Untitled account"; // src/wallet/wallet2.cpp:941
+
+    public void addAccount() {
+        addAccount(NEW_ACCOUNT_NAME);
+    }
+
+    public native void addAccount(String label);
+
+    public String getAccountLabel() {
+        return getAccountLabel(accountIndex);
+    }
+
+    public String getAccountLabel(int accountIndex) {
+        String label = getSubaddressLabel(accountIndex, 0);
+        if (label.equals(NEW_ACCOUNT_NAME)) {
+            String address = getAddress(accountIndex);
+            int len = address.length();
+            label = address.substring(0, 6) +
+                    "\u2026" + address.substring(len - 6, len);
+        }
+        return label;
+    }
+
+    public String getSubaddressLabel(int addressIndex) {
+        return getSubaddressLabel(accountIndex, addressIndex);
+    }
+
+    public native String getSubaddressLabel(int accountIndex, int addressIndex);
+
+    public void setAccountLabel(String label) {
+        setAccountLabel(accountIndex, label);
+    }
+
+    public void setAccountLabel(int accountIndex, String label) {
+        setSubaddressLabel(accountIndex, 0, label);
+    }
+
+    public void setSubaddressLabel(int addressIndex, String label) {
+        setSubaddressLabel(accountIndex, addressIndex, label);
+        refreshHistory();
+    }
+
+    public native void setSubaddressLabel(int accountIndex, int addressIndex, String label);
+
+    public native int getNumAccounts();
+
+    public int getNumSubaddresses() {
+        return getNumSubaddresses(accountIndex);
+    }
+
+    public native int getNumSubaddresses(int accountIndex);
+
+    public String getNewSubaddress() {
+        return getNewSubaddress(accountIndex);
+    }
+
+    public String getNewSubaddress(int accountIndex) {
+        String timeStamp = new SimpleDateFormat("yyyy-MM-dd-HH:mm:ss", Locale.US).format(new Date());
+        addSubaddress(accountIndex, timeStamp);
+        String subaddress = getLastSubaddress(accountIndex);
+        Timber.d("%d: %s", getNumSubaddresses(accountIndex) - 1, subaddress);
+        return subaddress;
+    }
+
+    public native void addSubaddress(int accountIndex, String label);
+
+    public String getLastSubaddress(int accountIndex) {
+        return getSubaddress(accountIndex, getNumSubaddresses(accountIndex) - 1);
+    }
+
+    public Wallet.Device getDeviceType() {
+        int device = getDeviceTypeJ();
+        return Wallet.Device.values()[device + 1]; // mapping is monero+1=android
+    }
+
+    private native int getDeviceTypeJ();
+
+}

app/src/main/java/com/m2049r/xmrwallet/model/WalletListener.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+public interface WalletListener {
+    /**
+     * moneySpent - called when money spent
+     * @param txId   - transaction id
+     * @param amount - tvAmount
+     */
+    void moneySpent(String txId, long amount);
+
+    /**
+     * moneyReceived - called when money received
+     * @param txId   - transaction id
+     * @param amount - tvAmount
+     */
+    void moneyReceived(String txId, long amount);
+
+    /**
+     * unconfirmedMoneyReceived - called when payment arrived in tx pool
+     * @param txId   - transaction id
+     * @param amount - tvAmount
+     */
+    void unconfirmedMoneyReceived(String txId, long amount);
+
+    /**
+     * newBlock      - called when new block received
+     * @param height - block height
+     */
+    void newBlock(long height);
+
+    /**
+     * updated  - generic callback, called when any event (sent/received/block reveived/etc) happened with the wallet;
+     */
+    void updated();
+
+    /**
+     * refreshed - called when wallet refreshed by background thread or explicitly refreshed by calling "refresh" synchronously
+     */
+    void refreshed();
+
+}

app/src/main/java/com/m2049r/xmrwallet/model/WalletManager.java

@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2017 m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.model;
+
+import com.m2049r.xmrwallet.XmrWalletApplication;
+import com.m2049r.xmrwallet.data.Node;
+import com.m2049r.xmrwallet.ledger.Ledger;
+import com.m2049r.xmrwallet.util.RestoreHeight;
+
+import java.io.File;
+import java.io.FilenameFilter;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.List;
+
+import lombok.Getter;
+import timber.log.Timber;
+
+public class WalletManager {
+
+    static {
+        System.loadLibrary("monerujo");
+    }
+
+    // no need to keep a reference to the REAL WalletManager (we get it every tvTime we need it)
+    private static WalletManager Instance = null;
+
+    public static synchronized WalletManager getInstance() {
+        if (WalletManager.Instance == null) {
+            WalletManager.Instance = new WalletManager();
+        }
+
+        return WalletManager.Instance;
+    }
+
+    public String addressPrefix() {
+        return addressPrefix(getNetworkType());
+    }
+
+    static public String addressPrefix(NetworkType networkType) {
+        switch (networkType) {
+            case NetworkType_Testnet:
+                return "9A-";
+            case NetworkType_Mainnet:
+                return "4-";
+            case NetworkType_Stagenet:
+                return "5-";
+            default:
+                throw new IllegalStateException("Unsupported Network: " + networkType);
+        }
+    }
+
+    private Wallet managedWallet = null;
+
+    public Wallet getWallet() {
+        return managedWallet;
+    }
+
+    private void manageWallet(Wallet wallet) {
+        Timber.d("Managing %s", wallet.getName());
+        managedWallet = wallet;
+    }
+
+    private void unmanageWallet(Wallet wallet) {
+        if (wallet == null) {
+            throw new IllegalArgumentException("Cannot unmanage null!");
+        }
+        if (getWallet() == null) {
+            throw new IllegalStateException("No wallet under management!");
+        }
+        if (getWallet() != wallet) {
+            throw new IllegalStateException(wallet.getName() + " not under management!");
+        }
+        Timber.d("Unmanaging %s", managedWallet.getName());
+        managedWallet = null;
+    }
+
+    public Wallet createWallet(File aFile, String password, String language, long height) {
+        long walletHandle = createWalletJ(aFile.getAbsolutePath(), password, language, getNetworkType().getValue());
+        Wallet wallet = new Wallet(walletHandle);
+        manageWallet(wallet);
+        if (wallet.getStatus().isOk()) {
+            // (Re-)Estimate restore height based on what we know
+            final long oldHeight = wallet.getRestoreHeight();
+            // Go back 4 days if we don't have a precise restore height
+            Calendar restoreDate = Calendar.getInstance();
+            restoreDate.add(Calendar.DAY_OF_MONTH, -4);
+            final long restoreHeight =
+                    (height > -1) ? height : RestoreHeight.getInstance().getHeight(restoreDate.getTime());
+            wallet.setRestoreHeight(restoreHeight);
+            Timber.d("Changed Restore Height from %d to %d", oldHeight, wallet.getRestoreHeight());
+            wallet.setPassword(password); // this rewrites the keys file (which contains the restore height)
+        } else
+            Timber.e(wallet.getStatus().toString());
+        return wallet;
+    }
+
+    private native long createWalletJ(String path, String password, String language, int networkType);
+
+    public Wallet openAccount(String path, int accountIndex, String password) {
+        long walletHandle = openWalletJ(path, password, getNetworkType().getValue());
+        Wallet wallet = new Wallet(walletHandle, accountIndex);
+        manageWallet(wallet);
+        return wallet;
+    }
+
+    public Wallet openWallet(String path, String password) {
+        long walletHandle = openWalletJ(path, password, getNetworkType().getValue());
+        Wallet wallet = new Wallet(walletHandle);
+        manageWallet(wallet);
+        return wallet;
+    }
+
+    private native long openWalletJ(String path, String password, int networkType);
+
+    public Wallet recoveryWallet(File aFile, String password,
+                                 String mnemonic, String offset,
+                                 long restoreHeight) {
+        long walletHandle = recoveryWalletJ(aFile.getAbsolutePath(), password,
+                mnemonic, offset,
+                getNetworkType().getValue(), restoreHeight);
+        Wallet wallet = new Wallet(walletHandle);
+        manageWallet(wallet);
+        return wallet;
+    }
+
+    private native long recoveryWalletJ(String path, String password,
+                                        String mnemonic, String offset,
+                                        int networkType, long restoreHeight);
+
+    public Wallet createWalletWithKeys(File aFile, String password, String language, long restoreHeight,
+                                       String addressString, String viewKeyString, String spendKeyString) {
+        long walletHandle = createWalletFromKeysJ(aFile.getAbsolutePath(), password,
+                language, getNetworkType().getValue(), restoreHeight,
+                addressString, viewKeyString, spendKeyString);
+        Wallet wallet = new Wallet(walletHandle);
+        manageWallet(wallet);
+        return wallet;
+    }
+
+    private native long createWalletFromKeysJ(String path, String password,
+                                              String language,
+                                              int networkType,
+                                              long restoreHeight,
+                                              String addressString,
+                                              String viewKeyString,
+                                              String spendKeyString);
+
+    public Wallet createWalletFromDevice(File aFile, String password, long restoreHeight,
+                                         String deviceName) {
+        long walletHandle = createWalletFromDeviceJ(aFile.getAbsolutePath(), password,
+                getNetworkType().getValue(), deviceName, restoreHeight,
+                Ledger.SUBADDRESS_LOOKAHEAD);
+        Wallet wallet = new Wallet(walletHandle);
+        manageWallet(wallet);
+        return wallet;
+    }
+
+    private native long createWalletFromDeviceJ(String path, String password,
+                                                int networkType,
+                                                String deviceName,
+                                                long restoreHeight,
+                                                String subaddressLookahead);
+
+
+    public native boolean closeJ(Wallet wallet);
+
+    public boolean close(Wallet wallet) {
+        unmanageWallet(wallet);
+        boolean closed = closeJ(wallet);
+        if (!closed) {
+            // in case we could not close it
+            // we manage it again
+            manageWallet(wallet);
+        }
+        return closed;
+    }
+
+    public boolean walletExists(File aFile) {
+        return walletExists(aFile.getAbsolutePath());
+    }
+
+    public native boolean walletExists(String path);
+
+    public native boolean verifyWalletPassword(String keys_file_name, String password, boolean watch_only);
+
+    public boolean verifyWalletPasswordOnly(String keys_file_name, String password) {
+        return queryWalletDeviceJ(keys_file_name, password) >= 0;
+    }
+
+    public Wallet.Device queryWalletDevice(String keys_file_name, String password) {
+        int device = queryWalletDeviceJ(keys_file_name, password);
+        return Wallet.Device.values()[device + 1]; // mapping is monero+1=android
+    }
+
+    private native int queryWalletDeviceJ(String keys_file_name, String password);
+
+    //public native List<String> findWallets(String path); // this does not work - some error in boost
+
+    public class WalletInfo implements Comparable<WalletInfo> {
+        @Getter
+        final private File path;
+        @Getter
+        final private String name;
+
+        public WalletInfo(File wallet) {
+            path = wallet.getParentFile();
+            name = wallet.getName();
+        }
+
+        @Override
+        public int compareTo(WalletInfo another) {
+            return name.toLowerCase().compareTo(another.name.toLowerCase());
+        }
+    }
+
+    public List<WalletInfo> findWallets(File path) {
+        List<WalletInfo> wallets = new ArrayList<>();
+        Timber.d("Scanning: %s", path.getAbsolutePath());
+        File[] found = path.listFiles(new FilenameFilter() {
+            public boolean accept(File dir, String filename) {
+                return filename.endsWith(".keys");
+            }
+        });
+        for (int i = 0; i < found.length; i++) {
+            String filename = found[i].getName();
+            File f = new File(found[i].getParent(), filename.substring(0, filename.length() - 5)); // 5 is length of ".keys"+1
+            wallets.add(new WalletInfo(f));
+        }
+        return wallets;
+    }
+
+//TODO virtual bool checkPayment(const std::string &address, const std::string &txid, const std::string &txkey, const std::string &daemon_address, uint64_t &received, uint64_t &height, std::string &error) const = 0;
+
+    private String daemonAddress = null;
+    private final NetworkType networkType = XmrWalletApplication.getNetworkType();
+
+    public NetworkType getNetworkType() {
+        return networkType;
+    }
+
+    // this should not be called on the main thread as it connects to the node (and takes a long time)
+    public void setDaemon(Node node) {
+        if (node != null) {
+            this.daemonAddress = node.getAddress();
+            if (networkType != node.getNetworkType())
+                throw new IllegalArgumentException("network type does not match");
+            this.daemonUsername = node.getUsername();
+            this.daemonPassword = node.getPassword();
+            setDaemonAddressJ(daemonAddress);
+        } else {
+            this.daemonAddress = null;
+            this.daemonUsername = "";
+            this.daemonPassword = "";
+            //setDaemonAddressJ(""); // don't disconnect as monero code blocks for many seconds!
+            //TODO: need to do something about that later
+        }
+    }
+
+    public String getDaemonAddress() {
+        if (daemonAddress == null) {
+            throw new IllegalStateException("use setDaemon() to initialise daemon and net first!");
+        }
+        return this.daemonAddress;
+    }
+
+    private native void setDaemonAddressJ(String address);
+
+    private String daemonUsername = "";
+
+    public String getDaemonUsername() {
+        return daemonUsername;
+    }
+
+    private String daemonPassword = "";
+
+    public String getDaemonPassword() {
+        return daemonPassword;
+    }
+
+    public native int getDaemonVersion();
+
+    public native long getBlockchainHeight();
+
+    public native long getBlockchainTargetHeight();
+
+    public native long getNetworkDifficulty();
+
+    public native double getMiningHashRate();
+
+    public native long getBlockTarget();
+
+    public native boolean isMining();
+
+    public native boolean startMining(String address, boolean background_mining, boolean ignore_battery);
+
+    public native boolean stopMining();
+
+    public native String resolveOpenAlias(String address, boolean dnssec_valid);
+
+    public native boolean setProxy(String address);
+
+//TODO static std::tuple<bool, std::string, std::string, std::string, std::string> checkUpdates(const std::string &software, const std::string &subdir);
+
+    static public native void initLogger(String argv0, String defaultLogBaseName);
+
+    //TODO: maybe put these in an enum like in monero core - but why?
+    static public int LOGLEVEL_SILENT = -1;
+    static public int LOGLEVEL_WARN = 0;
+    static public int LOGLEVEL_INFO = 1;
+    static public int LOGLEVEL_DEBUG = 2;
+    static public int LOGLEVEL_TRACE = 3;
+    static public int LOGLEVEL_MAX = 4;
+
+    static public native void setLogLevel(int level);
+
+    static public native void logDebug(String category, String message);
+
+    static public native void logInfo(String category, String message);
+
+    static public native void logWarning(String category, String message);
+
+    static public native void logError(String category, String message);
+
+    static public native String moneroVersion();
+}

app/src/main/java/com/m2049r/xmrwallet/onboarding/OnBoardingActivity.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright (c) 2018-2020 EarlOfEgo, m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.onboarding;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.TypedValue;
+import android.view.View;
+import android.widget.Button;
+import android.widget.LinearLayout;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.viewpager.widget.ViewPager;
+
+import com.google.android.material.tabs.TabLayout;
+import com.m2049r.xmrwallet.LoginActivity;
+import com.m2049r.xmrwallet.R;
+import com.m2049r.xmrwallet.util.KeyStoreHelper;
+
+public class OnBoardingActivity extends AppCompatActivity implements OnBoardingAdapter.Listener {
+
+    private OnBoardingViewPager pager;
+    private OnBoardingAdapter pagerAdapter;
+    private Button nextButton;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_on_boarding);
+
+        nextButton = findViewById(R.id.buttonNext);
+
+        pager = findViewById(R.id.pager);
+        pagerAdapter = new OnBoardingAdapter(this, this);
+        pager.setAdapter(pagerAdapter);
+        int pixels = (int) TypedValue.applyDimension(
+                TypedValue.COMPLEX_UNIT_DIP, 16, getResources().getDisplayMetrics());
+        pager.setPageMargin(pixels);
+        pager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
+            @Override
+            public void onPageSelected(int position) {
+                setButtonState(position);
+            }
+        });
+
+        final TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
+        if (pagerAdapter.getCount() > 1) {
+            tabLayout.setupWithViewPager(pager, true);
+            LinearLayout tabStrip = ((LinearLayout) tabLayout.getChildAt(0));
+            for (int i = 0; i < tabStrip.getChildCount(); i++) {
+                tabStrip.getChildAt(i).setClickable(false);
+            }
+        } else {
+            tabLayout.setVisibility(View.GONE);
+        }
+
+        nextButton.setOnClickListener(v -> {
+            final int item = pager.getCurrentItem();
+            if (item + 1 >= pagerAdapter.getCount()) {
+                finishOnboarding();
+            } else {
+                pager.setCurrentItem(item + 1);
+            }
+        });
+
+        // let old users who have fingerprint wallets already agree for fingerprint sending
+        OnBoardingScreen.FPSEND.setMustAgree(KeyStoreHelper.hasStoredPasswords(this));
+
+        for (int i = 0; i < OnBoardingScreen.values().length; i++) {
+            agreed[i] = !OnBoardingScreen.values()[i].isMustAgree();
+        }
+
+        setButtonState(0);
+    }
+
+    private void finishOnboarding() {
+        nextButton.setEnabled(false);
+        OnBoardingManager.setOnBoardingShown(getApplicationContext());
+        startActivity(new Intent(this, LoginActivity.class));
+        finish();
+    }
+
+    boolean[] agreed = new boolean[OnBoardingScreen.values().length];
+
+    @Override
+    public void setAgreeClicked(int position, boolean isChecked) {
+        agreed[position] = isChecked;
+        setButtonState(position);
+    }
+
+    @Override
+    public boolean isAgreeClicked(int position) {
+        return agreed[position];
+    }
+
+    @Override
+    public void setButtonState(int position) {
+        nextButton.setEnabled(agreed[position]);
+        if (nextButton.isEnabled())
+            pager.setAllowedSwipeDirection(OnBoardingViewPager.SwipeDirection.ALL);
+        else
+            pager.setAllowedSwipeDirection(OnBoardingViewPager.SwipeDirection.LEFT);
+        if (pager.getCurrentItem() + 1 == pagerAdapter.getCount()) { // last page
+            nextButton.setText(R.string.onboarding_button_ready);
+        } else {
+            nextButton.setText(R.string.onboarding_button_next);
+        }
+    }
+}

app/src/main/java/com/m2049r/xmrwallet/onboarding/OnBoardingAdapter.java

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2018-2020 EarlOfEgo, m2049r
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.m2049r.xmrwallet.onboarding;
+
+import android.content.Context;
+import android.graphics.drawable.Drawable;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CheckBox;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.core.content.ContextCompat;
+import androidx.viewpager.widget.PagerAdapter;
+
+import com.m2049r.xmrwallet.R;
+
+import timber.log.Timber;
+
+public class OnBoardingAdapter extends PagerAdapter {
+
+    interface Listener {
+        void setAgreeClicked(int position, boolean isChecked);
+
+        boolean isAgreeClicked(int position);
+
+        void setButtonState(int position);
+    }
+
+    private final Context context;
+    private Listener listener;
+
+    OnBoardingAdapter(final Context context, final Listener listener) {
+        this.context = context;
+        this.listener = listener;
+    }
+
+    @NonNull
+    @Override
+    public Object instantiateItem(@NonNull ViewGroup collection, int position) {
+        LayoutInflater inflater = LayoutInflater.from(context);
+        final View view = inflater.inflate(R.layout.view_onboarding, collection, false);
+        final OnBoardingScreen onBoardingScreen = OnBoardingScreen.values()[position];
+
+        final Drawable drawable = ContextCompat.getDrawable(context, onBoardingScreen.getDrawable());
+        ((ImageView) view.findViewById(R.id.onboardingImage)).setImageDrawable(drawable);
+        ((TextView) view.findViewById(R.id.onboardingTitle)).setText(onBoardingScreen.getTitle());
+        ((TextView) view.findViewById(R.id.onboardingInformation)).setText(onBoardingScreen.getInformation());
+        if (onBoardingScreen.isMustAgree()) {
+            final CheckBox agree = ((CheckBox) view.findViewById(R.id.onboardingAgree));
+            agree.setVisibility(View.VISIBLE);
+            agree.setChecked(listener.isAgreeClicked(position));
+            agree.setOnClickListener(v -> {
+                listener.setAgreeClicked(position, ((CheckBox) v).isChecked());
+            });
+        }
+        collection.addView(view);
+        return view;
+    }
+
+    @Override
+    public int getCount() {
+        return OnBoardingScreen.values().length;
+    }
+
+    @Override
+    public void destroyItem(@NonNull ViewGroup collection, int position, @NonNull Object view) {
+        Timber.d("destroy " + position);
+        collection.removeView((View) view);
+    }
+
+    @Override
+    public boolean isViewFromObject(@NonNull final View view, @NonNull final Object object) {
+        return view == object;
+    }
+}