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[pigeon] Reland: Add an initial example app (flutter#3832)
Relands flutter/packages#3761, with the native runners re-created from `stable`. The important change was the principle class in the macOS Info.plist being NSApplication instead of `FlutterApplication`, since the latter doesn't exist on stable. (The pigeon versions also changed because when I re-created the app I re-ran pigeon, and had a slightly newer version.)
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‎.github/dependabot.yml

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- dependency-name: "*"
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update-types: ["version-update:semver-minor", "version-update:semver-patch"]
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- package-ecosystem: "gradle"
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directory: "/packages/pigeon/example/app/android/app"
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commit-message:
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prefix: "[pigeon]"
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schedule:
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interval: "weekly"
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open-pull-requests-limit: 10
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ignore:
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- dependency-name: "com.android.tools.build:gradle"
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update-types: ["version-update:semver-minor", "version-update:semver-patch"]
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- dependency-name: "junit:junit"
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update-types: ["version-update:semver-minor", "version-update:semver-patch"]
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- dependency-name: "org.mockito:*"
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update-types: ["version-update:semver-minor", "version-update:semver-patch"]
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- dependency-name: "androidx.test:*"
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update-types: ["version-update:semver-minor", "version-update:semver-patch"]
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- dependency-name: "org.robolectric:*"
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update-types: ["version-update:semver-minor", "version-update:semver-patch"]
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- package-ecosystem: "gradle"
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directory: "/packages/pigeon/platform_tests/test_plugin/android"
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commit-message:

‎packages/pigeon/CHANGELOG.md

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## NEXT
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* Adds an example application that uses Pigeon directly, rather than in a plugin.
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## 9.2.5
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* Reports an error when trying to use an enum directly in a `List` or `Map`

‎packages/pigeon/example/app/.gitignore

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# Miscellaneous
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*.class
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*.log
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*.pyc
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*.swp
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.DS_Store
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.atom/
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.buildlog/
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.history
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.svn/
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migrate_working_dir/
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# IntelliJ related
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*.iml
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*.ipr
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*.iws
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.idea/
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# The .vscode folder contains launch configuration and tasks you configure in
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# VS Code which you may wish to be included in version control, so this line
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# is commented out by default.
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#.vscode/
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# Flutter/Dart/Pub related
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**/doc/api/
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**/ios/Flutter/.last_build_id
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.dart_tool/
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.flutter-plugins
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.flutter-plugins-dependencies
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.packages
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.pub-cache/
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.pub/
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/build/
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# Symbolication related
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app.*.symbols
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# Obfuscation related
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app.*.map.json
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# Android Studio will place build artifacts here
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/android/app/debug
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/android/app/profile
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/android/app/release

‎packages/pigeon/example/app/.metadata

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# This file tracks properties of this Flutter project.
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# Used by Flutter tool to assess capabilities and perform upgrades etc.
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#
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# This file should be version controlled.
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version:
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revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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channel: stable
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project_type: app
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# Tracks metadata for the flutter migrate command
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migration:
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platforms:
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- platform: root
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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- platform: android
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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- platform: ios
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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- platform: linux
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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- platform: macos
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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- platform: web
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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- platform: windows
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create_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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base_revision: 4d9e56e694b656610ab87fcf2efbcd226e0ed8cf
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# User provided section
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# List of Local paths (relative to this file) that should be
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# ignored by the migrate tool.
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#
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# Files that are not part of the templates will be ignored by default.
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unmanaged_files:
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- 'lib/main.dart'
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- 'ios/Runner.xcodeproj/project.pbxproj'

‎packages/pigeon/example/app/README.md

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# pigeon_example_app
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This demonstrates using Pigeon for platform communication directly in an
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application, rather than in a plugin.
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To update the generated code, run:
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```sh
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dart run pigeon --input pigeons/messages.dart
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```

‎packages/pigeon/example/app/android/.gitignore

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gradle-wrapper.jar
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/.gradle
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/captures/
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/gradlew
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/gradlew.bat
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/local.properties
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GeneratedPluginRegistrant.java
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# Remember to never publicly share your keystore.
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# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
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key.properties
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**/*.keystore
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**/*.jks

‎packages/pigeon/example/app/android/app/build.gradle

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def localProperties = new Properties()
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def localPropertiesFile = rootProject.file('local.properties')
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if (localPropertiesFile.exists()) {
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localPropertiesFile.withReader('UTF-8') { reader ->
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localProperties.load(reader)
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}
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}
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def flutterRoot = localProperties.getProperty('flutter.sdk')
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if (flutterRoot == null) {
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throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
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}
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def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
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if (flutterVersionCode == null) {
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flutterVersionCode = '1'
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}
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def flutterVersionName = localProperties.getProperty('flutter.versionName')
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if (flutterVersionName == null) {
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flutterVersionName = '1.0'
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}
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apply plugin: 'com.android.application'
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apply plugin: 'kotlin-android'
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apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
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android {
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namespace "dev.flutter.pigeon_example_app"
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compileSdkVersion flutter.compileSdkVersion
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ndkVersion flutter.ndkVersion
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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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kotlinOptions {
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jvmTarget = '1.8'
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}
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sourceSets {
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main.java.srcDirs += 'src/main/kotlin'
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}
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defaultConfig {
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// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
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applicationId "dev.flutter.pigeon_example_app"
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// You can update the following values to match your application needs.
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// For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
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minSdkVersion flutter.minSdkVersion
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targetSdkVersion flutter.targetSdkVersion
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versionCode flutterVersionCode.toInteger()
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versionName flutterVersionName
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}
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buildTypes {
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release {
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// TODO: Add your own signing config for the release build.
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// Signing with the debug keys for now, so `flutter run --release` works.
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signingConfig signingConfigs.debug
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}
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}
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}
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flutter {
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source '../..'
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}
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dependencies {
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implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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}

‎packages/pigeon/example/app/android/app/src/debug/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<!-- The INTERNET permission is required for development. Specifically,
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the Flutter tool needs it to communicate with the running application
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to allow setting breakpoints, to provide hot reload, etc.
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-->
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<uses-permission android:name="android.permission.INTERNET"/>
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</manifest>

‎packages/pigeon/example/app/android/app/src/main/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<application
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android:label="pigeon_example_app"
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android:name="${applicationName}"
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android:icon="@mipmap/ic_launcher">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:launchMode="singleTop"
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android:theme="@style/LaunchTheme"
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android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
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android:hardwareAccelerated="true"
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android:windowSoftInputMode="adjustResize">
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<!-- Specifies an Android theme to apply to this Activity as soon as
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the Android process has started. This theme is visible to the user
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while the Flutter UI initializes. After that, this theme continues
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to determine the Window background behind the Flutter UI. -->
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<meta-data
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android:name="io.flutter.embedding.android.NormalTheme"
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android:resource="@style/NormalTheme"
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/>
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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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<!-- Don't delete the meta-data below.
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This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
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<meta-data
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android:name="flutterEmbedding"
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android:value="2" />
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</application>
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</manifest>

‎packages/pigeon/example/app/android/app/src/main/kotlin/dev/flutter/pigeon_example_app/MainActivity.kt

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// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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package dev.flutter.pigeon_example_app
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import ExampleHostApi
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import androidx.annotation.NonNull
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import io.flutter.embedding.android.FlutterActivity
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import io.flutter.embedding.engine.FlutterEngine
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private class PigeonApiImplementation: ExampleHostApi {
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override fun getHostLanguage(): String {
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return "Kotlin"
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}
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}
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class MainActivity: FlutterActivity() {
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override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
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super.configureFlutterEngine(flutterEngine)
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val api = PigeonApiImplementation()
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ExampleHostApi.setUp(flutterEngine.dartExecutor.binaryMessenger, api);
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}
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}

‎packages/pigeon/example/app/android/app/src/main/kotlin/dev/flutter/pigeon_example_app/Messages.g.kt

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// Copyright 2013 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Autogenerated from Pigeon (v9.2.5), do not edit directly.
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// See also: https://pub.dev/packages/pigeon
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import android.util.Log
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import io.flutter.plugin.common.BasicMessageChannel
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import io.flutter.plugin.common.BinaryMessenger
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import io.flutter.plugin.common.MessageCodec
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import io.flutter.plugin.common.StandardMessageCodec
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import java.io.ByteArrayOutputStream
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import java.nio.ByteBuffer
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private fun wrapResult(result: Any?): List<Any?> {
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return listOf(result)
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}
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private fun wrapError(exception: Throwable): List<Any?> {
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if (exception is FlutterError) {
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return listOf(
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exception.code,
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exception.message,
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exception.details
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)
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} else {
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return listOf(
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exception.javaClass.simpleName,
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exception.toString(),
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"Cause: " + exception.cause + ", Stacktrace: " + Log.getStackTraceString(exception)
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)
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}
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}
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/**
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* Error class for passing custom error details to Flutter via a thrown PlatformException.
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* @property code The error code.
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* @property message The error message.
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* @property details The error details. Must be a datatype supported by the api codec.
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*/
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class FlutterError (
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val code: String,
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override val message: String? = null,
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val details: Any? = null
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) : Throwable()
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/** Generated interface from Pigeon that represents a handler of messages from Flutter. */
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interface ExampleHostApi {
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fun getHostLanguage(): String
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companion object {
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/** The codec used by ExampleHostApi. */
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val codec: MessageCodec<Any?> by lazy {
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StandardMessageCodec()
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}
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/** Sets up an instance of `ExampleHostApi` to handle messages through the `binaryMessenger`. */
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@Suppress("UNCHECKED_CAST")
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fun setUp(binaryMessenger: BinaryMessenger, api: ExampleHostApi?) {
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run {
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val channel = BasicMessageChannel<Any?>(binaryMessenger, "dev.flutter.pigeon.ExampleHostApi.getHostLanguage", codec)
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if (api != null) {
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channel.setMessageHandler { _, reply ->
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var wrapped: List<Any?>
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try {
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wrapped = listOf<Any?>(api.getHostLanguage())
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} catch (exception: Throwable) {
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wrapped = wrapError(exception)
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}
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reply.reply(wrapped)
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}
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} else {
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channel.setMessageHandler(null)
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}
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}
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}
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}
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}

‎packages/pigeon/example/app/android/app/src/main/res/drawable-v21/launch_background.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!-- Modify this file to customize your launch splash screen -->
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:drawable="?android:colorBackground" />
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<!-- You can insert your own image assets here -->
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<!-- <item>
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<bitmap
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android:gravity="center"
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android:src="@mipmap/launch_image" />
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</item> -->
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</layer-list>

‎packages/pigeon/example/app/android/app/src/main/res/drawable/launch_background.xml

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<?xml version="1.0" encoding="utf-8"?>
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<!-- Modify this file to customize your launch splash screen -->
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<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
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<item android:drawable="@android:color/white" />
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<!-- You can insert your own image assets here -->
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<!-- <item>
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<bitmap
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android:gravity="center"
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android:src="@mipmap/launch_image" />
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</item> -->
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</layer-list>

‎packages/pigeon/example/app/android/app/src/main/res/mipmap-hdpi/ic_launcher.png

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‎packages/pigeon/example/app/android/app/src/main/res/mipmap-xhdpi/ic_launcher.png

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‎packages/pigeon/example/app/android/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png

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