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Sample Android application
This is a sample Android application that can be built with gradle and buck. It requires import_deps provided in facebook/buck#2706.
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‎android/hello_world/.buckconfig

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[cache]
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mode = dir
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dir_max_size = 1GB
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[android]
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target = android-32
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[java]
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src_roots = /java/
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source_level = 8
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target_level = 8

‎android/hello_world/.gitignore

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*.iml
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.gradle
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/local.properties
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/.idea/caches
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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/.idea/navEditor.xml
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/.idea/assetWizardSettings.xml
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.DS_Store
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/build
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/app/build
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/captures
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.externalNativeBuild
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.cxx
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local.properties
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app/libs/*
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# Buck
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/.buckd
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/buck-out
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/buck-cache
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# Keystores
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# In Buck, all input files must live under the project root.
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# Therefore, you need to create the following files in this
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# project with your own keystore:
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keystore/debug.keystore
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# Most likely, you can use the standard debug keystore by running
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# the following:
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#
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# cp ~/.android/debug.keystore keystore/debug.keystore
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third-party

‎android/hello_world/README.md

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This is a sample Android app that can be built with gradle and buck.
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How to build
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-------------
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Define ANDROID_SDK environment variable
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```shell
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export ANDROID_SDK=/home/yourname/Android/Sdk
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```
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Generate a keystore:
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```shell
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cd keystore
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keytool -genkey -keystore debug.keystore -alias my_alias \
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> -keyalg RSA -keysize 2048 -validity 10000
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```
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Update the keystore password in keystore/debug.keystore.properties.
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Create a list of project dependencies
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```shell
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cd ..
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mkdir buck-out
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./gradlew -q :app:dependencies --configuration debugCompileClasspath > buck-out/deps.txt
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./gradlew -q :app:dependencies --configuration debugRuntimeClasspath >> buck-out/deps.txt
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./gradlew -q :app:dependencies --configuration debugAnnotationProcessorClasspath >> buck-out/deps.txt
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```
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Use the import_deps tool to download dependencies and generate BUCK files.
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```shell
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cd ../import_deps
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./importdeps.py --gdeps /Users/mdzyuba/whatsapp/android/tools/buck/hello_world/buck-out/deps.txt --libs third-party
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cd ../hello_world
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mv ../import_deps/third-party .
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```
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Verify the generated third-party BUCK
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```shell
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buck targets //third-party:
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buck build //third-party:core
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```
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Start an Android emulator or device. It could be based on SDK Platform v21 - v32.
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To build and install the app, run:
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```shell
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buck install //app:app
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```
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Then run Hello World app on the device.
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Hare is a list of sample buck targets:
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```shell
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buck build //app:deps
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buck build //app:lib
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buck build //keystore:debug_keystore
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buck build //app:app
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```
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‎android/hello_world/app/BUCK

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android_library(
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name = "deps",
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exported_deps = [
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"//third-party/androidx/appcompat:appcompat",
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"//third-party/com/google/android/material:material",
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"//third-party/androidx/constraintlayout:constraintlayout"
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],
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visibility = ["PUBLIC"],
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)
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android_build_config(
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name = "build_config",
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package = "com.example.helloworld",
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)
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android_resource(
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name = 'res',
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res = 'src/main/res',
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package = 'com.example.helloworld',
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visibility = [
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"PUBLIC",
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],
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)
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android_library(
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name = 'lib',
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srcs = glob(['src/main/java/**/*.java']),
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deps = [
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':res',
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':deps'
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],
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)
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android_binary(
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name = 'app',
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aapt_mode = 'aapt2',
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manifest = 'src/main/AndroidManifest.xml',
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manifest_entries = {
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'version_code': 1,
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'version_name': '1.0',
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'min_sdk_version': 21,
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'target_sdk_version': 32
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},
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keystore = '//keystore:debug_keystore',
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deps = [
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':lib',
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':res',
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':deps',
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],
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)

‎android/hello_world/app/build.gradle

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plugins {
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id 'com.android.application'
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}
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android {
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compileSdk 32
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defaultConfig {
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applicationId "com.example.helloworld"
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minSdk 21
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targetSdk 32
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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compileOptions {
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sourceCompatibility JavaVersion.VERSION_1_8
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targetCompatibility JavaVersion.VERSION_1_8
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}
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}
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dependencies {
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implementation 'androidx.appcompat:appcompat:1.4.1'
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implementation 'com.google.android.material:material:1.5.0'
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implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
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testImplementation 'junit:junit:4.13.2'
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androidTestImplementation 'androidx.test.ext:junit:1.1.3'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
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}
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configurations {
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toCopy
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}
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dependencies {
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toCopy 'androidx.appcompat:appcompat:1.4.1'
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toCopy 'com.google.android.material:material:1.5.0'
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toCopy 'androidx.constraintlayout:constraintlayout:2.1.3'
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}
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task download(type: Copy) {
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from configurations.toCopy
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into 'libs'
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}
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‎android/hello_world/app/proguard-rules.pro

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎android/hello_world/app/src/androidTest/java/com/example/helloworld/ExampleInstrumentedTest.java

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package com.example.helloworld;
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import static org.junit.Assert.*;
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import android.content.Context;
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import androidx.test.ext.junit.runners.AndroidJUnit4;
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import androidx.test.platform.app.InstrumentationRegistry;
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import org.junit.Test;
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import org.junit.runner.RunWith;
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
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*/
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@RunWith(AndroidJUnit4.class)
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public class ExampleInstrumentedTest {
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@Test
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public void useAppContext() {
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// Context of the app under test.
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Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
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assertEquals("com.example.helloworld", appContext.getPackageName());
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}
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}

‎android/hello_world/app/src/main/AndroidManifest.xml

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="com.example.helloworld">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/Theme.HelloWorld">
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<activity
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android:name=".MainActivity"
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android:exported="true">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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</application>
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</manifest>

‎android/hello_world/app/src/main/java/com/example/helloworld/MainActivity.java

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package com.example.helloworld;
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import android.os.Bundle;
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import androidx.appcompat.app.AppCompatActivity;
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public class MainActivity extends AppCompatActivity {
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@Override
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protected void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
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}
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}

‎android/hello_world/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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<vector xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:aapt="http://schemas.android.com/aapt"
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android:width="108dp"
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android:height="108dp"
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android:viewportWidth="108"
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android:viewportHeight="108">
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<path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
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<aapt:attr name="android:fillColor">
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<gradient
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android:endX="85.84757"
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android:endY="92.4963"
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android:startX="42.9492"
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android:startY="49.59793"
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android:type="linear">
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<item
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android:color="#44000000"
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android:offset="0.0" />
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<item
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android:color="#00000000"
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android:offset="1.0" />
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</gradient>
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</aapt:attr>
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</path>
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<path
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android:fillColor="#FFFFFF"
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android:fillType="nonZero"
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android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
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android:strokeWidth="1"
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android:strokeColor="#00000000" />
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</vector>

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