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Initial Commit for PlaformChannel Sample App (#453)
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‎platform_channels/.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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# 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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.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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# Web related
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lib/generated_plugin_registrant.dart
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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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# Exceptions to above rules.
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!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

‎platform_channels/.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 and should not be manually edited.
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version:
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revision: 5f21edf8b66e31a39133177319414395cc5b5f48
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channel: stable
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project_type: app

‎platform_channels/README.md

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# Platform Channel Samples
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A sample app which demonstrates how to use `MethodChannel`, `EventChannel`, `BasicMessageChannel` and `MessageCodec` in Flutter.
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This sample is currently being built. Not all platforms and functionality are in place.
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## Goals
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* Demonstrate how to use `MethodChannel` to invoke platform methods.
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* Demonstrate how to use `EventChannel` to listen continuous value changes from the platform.
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* Demonstrate how to use `BasicMessageChanngel` and `MessageCodec` to send messages of different types across the platform.
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## Questions/issues
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If you have a general question about Platform Channels in Flutter, the
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best places to go are:
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* [The FlutterDev Google Group](https://groups.google.com/forum/#!forum/flutter-dev)
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* [The Flutter Gitter channel](https://gitter.im/flutter/flutter)
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* [StackOverflow](https://stackoverflow.com/questions/tagged/flutter)
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If you run into an issue with the sample itself, please file an issue [here](https://github.com/flutter/samples/issues).

‎platform_channels/analysis_options.yaml

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include: package:pedantic/analysis_options.yaml
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analyzer:
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strong-mode:
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implicit-casts: false
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implicit-dynamic: false
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linter:
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rules:
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- avoid_types_on_closure_parameters
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- avoid_void_async
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- await_only_futures
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- camel_case_types
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- cancel_subscriptions
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- close_sinks
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- constant_identifier_names
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- control_flow_in_finally
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- directives_ordering
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- empty_statements
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- hash_and_equals
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- implementation_imports
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- non_constant_identifier_names
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- package_api_docs
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- package_names
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- package_prefixed_library_names
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- test_types_in_equals
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- throw_in_finally
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- unnecessary_brace_in_string_interps
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- unnecessary_getters_setters
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- unnecessary_new
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- unnecessary_statements

‎platform_channels/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

‎platform_channels/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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compileSdkVersion 28
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sourceSets {
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main.java.srcDirs += 'src/main/kotlin'
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}
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lintOptions {
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disable 'InvalidPackage'
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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 "com.example.platform_channels"
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minSdkVersion 16
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targetSdkVersion 28
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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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}

‎platform_channels/android/app/src/debug/AndroidManifest.xml

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="dev.flutter.platform_channels">
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<!-- Flutter 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>

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

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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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package="dev.flutter.platform_channels">
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<!-- io.flutter.app.FlutterApplication is an android.app.Application that
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calls FlutterMain.startInitialization(this); in its onCreate method.
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In most cases you can leave this as-is, but you if you want to provide
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additional functionality it is fine to subclass or reimplement
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FlutterApplication and put your custom class here. -->
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<application
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android:name="io.flutter.app.FlutterApplication"
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android:label="platform_channels"
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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: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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<!-- Displays an Android View that continues showing the launch screen
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Drawable until Flutter paints its first frame, then this splash
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screen fades out. A splash screen is useful to avoid any visual
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gap between the end of Android's launch screen and the painting of
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Flutter's first frame. -->
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<meta-data
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android:name="io.flutter.embedding.android.SplashScreenDrawable"
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android:resource="@drawable/launch_background"
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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>

‎platform_channels/android/app/src/main/kotlin/dev/flutter/platform_channels/MainActivity.kt

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package dev.flutter.platform_channels
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import io.flutter.embedding.android.FlutterActivity
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import io.flutter.embedding.engine.FlutterEngine
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import io.flutter.plugin.common.MethodChannel
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class MainActivity : FlutterActivity() {
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override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
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// Creates a MethodChannel as soon as the FlutterEngine is attached to
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// the Activity, and registers a MethodCallHandler. The Method.setMethodCallHandler
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// is responsible to register a MethodCallHandler to handle the incoming calls.
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// The call parameter of MethodCallHandler has information about the incoming call,
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// like method name, and arguments. The result parameter of MethodCallHandler is
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// responsible to send the results of the call.
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MethodChannel(flutterEngine.dartExecutor, "methodChannelDemo")
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.setMethodCallHandler { call, result ->
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val count: Int? = call.argument<Int>("count")
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if (count == null) {
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result.error("INVALID ARGUMENT", "Value of count cannot be null", null)
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} else {
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when (call.method) {
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"increment" -> result.success(count + 1)
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"decrement" -> result.success(count - 1)
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else -> result.notImplemented()
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}
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}
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}
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}
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}

‎platform_channels/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>

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