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Added sample for multiple flutters for android
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‎add_to_app/multiple_flutters/multiple_flutters_android/.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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/captures
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.externalNativeBuild
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.cxx
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local.properties

‎add_to_app/multiple_flutters/multiple_flutters_android/README.md

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# multiple_flutters_android
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This is an add-to-app sample that uses the Flutter engine group API to host
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multiple instances of Flutter in the app.
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## Getting Started
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```sh
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cd ../multiple_flutters_module
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flutter pub get
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cd -
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open -a "Android Studio" multiple_flutters_android/ # macOS command
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# (build and run)
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```
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For more information see
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[multiple_flutters_module](../multiple_flutters_module/README.md).

‎add_to_app/multiple_flutters/multiple_flutters_android/app/.gitignore

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/build

‎add_to_app/multiple_flutters/multiple_flutters_android/app/build.gradle

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plugins {
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id 'com.android.application'
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id 'kotlin-android'
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}
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android {
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signingConfigs {
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self {
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}
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}
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compileSdkVersion 30
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defaultConfig {
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applicationId "dev.flutter.multipleflutters"
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minSdkVersion 24
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targetSdkVersion 30
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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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signingConfig debug.signingConfig
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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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kotlinOptions {
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jvmTarget = '1.8'
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}
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}
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dependencies {
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implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
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implementation 'androidx.core:core-ktx:1.2.0'
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implementation 'androidx.appcompat:appcompat:1.1.0'
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implementation 'com.google.android.material:material:1.1.0'
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implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
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testImplementation 'junit:junit:4.+'
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androidTestImplementation 'androidx.test.ext:junit:1.1.1'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
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implementation project(':flutter')
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}

‎add_to_app/multiple_flutters/multiple_flutters_android/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

‎add_to_app/multiple_flutters/multiple_flutters_android/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="dev.flutter.multipleflutters">
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<application
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android:name=".App"
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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.MultipleFlutters">
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<activity android:name=".MainActivity">
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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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<activity
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android:name=".SingleFlutterActivity"
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android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
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android:hardwareAccelerated="true"
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android:windowSoftInputMode="adjustResize"
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/>
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<activity
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android:name=".DoubleFlutterActivity"
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android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
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android:hardwareAccelerated="true"
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android:windowSoftInputMode="adjustResize"
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/>
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</application>
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</manifest>

‎add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/java/dev/flutter/multipleflutters/App.kt

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package dev.flutter.multipleflutters
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import android.app.Application
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import io.flutter.embedding.engine.FlutterEngineGroup
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/**
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* Application class for this app.
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*
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* This holds onto our engine group.
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*/
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class App : Application() {
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lateinit var engines : FlutterEngineGroup
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override fun onCreate() {
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super.onCreate()
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engines = FlutterEngineGroup(this)
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}
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}

‎add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/java/dev/flutter/multipleflutters/DataModel.kt

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package dev.flutter.multipleflutters
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import java.lang.ref.WeakReference
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/**
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* Interface for getting notifications when the DataModel is updated.
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*/
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interface DataModelObserver {
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fun onCountUpdate(newCount : Int)
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}
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/**
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* A singleton/observable data model for the data shared between Flutter and the host platform.
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*
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* This is the definitive source of truth for all data.
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*/
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class DataModel {
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companion object {
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val instance = DataModel()
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}
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private val observers = mutableListOf<WeakReference<DataModelObserver>>()
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public var counter = 0
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set(value) {
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field = value
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for (observer in observers) {
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observer.get()?.onCountUpdate(value)
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}
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}
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fun addObserver(observer : DataModelObserver) {
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observers.add(WeakReference(observer))
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}
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fun removeObserver(observer : DataModelObserver) {
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observers.removeIf {
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if (it.get() != null) it.get() == observer else true
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}
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}
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}

‎add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/java/dev/flutter/multipleflutters/DoubleFlutterActivity.kt

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package dev.flutter.multipleflutters
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import android.content.Intent
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import android.os.Bundle
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import android.widget.FrameLayout
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import android.widget.LinearLayout
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import androidx.fragment.app.FragmentActivity
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import androidx.fragment.app.FragmentManager
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import io.flutter.embedding.android.FlutterFragment
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import io.flutter.embedding.engine.FlutterEngineCache
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/**
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* An activity that displays 2 FlutterFragments vertically.
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*/
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class DoubleFlutterActivity : FragmentActivity(), EngineBindingsDelegate {
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private val topBindings : EngineBindings by lazy {
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EngineBindings(activity = this, delegate = this, entrypoint = "topMain")
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}
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private val bottomBindings : EngineBindings by lazy {
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EngineBindings(activity = this, delegate = this, entrypoint = "bottomMain")
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}
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private val numberOfFlutters = 2
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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val root = LinearLayout(this)
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root.layoutParams = LinearLayout.LayoutParams(
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LinearLayout.LayoutParams.MATCH_PARENT,
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LinearLayout.LayoutParams.MATCH_PARENT
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)
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root.orientation = LinearLayout.VERTICAL
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root.weightSum = numberOfFlutters.toFloat()
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val fragmentManager: FragmentManager = supportFragmentManager
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setContentView(root)
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val app = applicationContext as App
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for (i in 0 until numberOfFlutters) {
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val flutterContainer = FrameLayout(this)
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root.addView(flutterContainer)
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flutterContainer.id = 12345 + i
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flutterContainer.layoutParams = LinearLayout.LayoutParams(
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FrameLayout.LayoutParams.MATCH_PARENT,
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FrameLayout.LayoutParams.MATCH_PARENT,
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1.0f
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)
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val engine = if (i == 0) topBindings.engine else bottomBindings.engine
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FlutterEngineCache.getInstance().put(i.toString(), engine)
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val flutterFragment =
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FlutterFragment.withCachedEngine(i.toString()).build<FlutterFragment>()
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fragmentManager
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.beginTransaction()
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.add(
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12345 + i,
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flutterFragment
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)
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.commit()
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}
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topBindings.attach()
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bottomBindings.attach()
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}
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override fun onDestroy() {
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topBindings.detach()
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topBindings.detach()
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for (i in 0 until numberOfFlutters) {
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FlutterEngineCache.getInstance().remove(i.toString())
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}
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super.onDestroy()
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}
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override fun onNext() {
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val flutterIntent = Intent(this, MainActivity::class.java)
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startActivity(flutterIntent)
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}
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}

‎add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/java/dev/flutter/multipleflutters/EngineBindings.kt

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package dev.flutter.multipleflutters
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import android.app.Activity
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import io.flutter.FlutterInjector
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import io.flutter.embedding.engine.FlutterEngine
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import io.flutter.embedding.engine.dart.DartExecutor
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import io.flutter.plugin.common.MethodChannel
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/**
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* This interface represents the notifications an EngineBindings may be receiving from the Flutter
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* instance.
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*
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* What methods this interface has depends on the messages that are sent over the EngineBinding's
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* channel in `main.dart`. Messages that interact with the DataModel are handled automatically
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* by the EngineBindings.
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*
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* @see main.dart for what messages are getting sent from Flutter.
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*/
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interface EngineBindingsDelegate {
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fun onNext()
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}
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/**
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* This binds a FlutterEngine instance with the DataModel and a channel for communicating with that
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* engine.
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*
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* Messages involving the DataModel are handled by the EngineBindings, other messages are forwarded
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* to the EngineBindingsDelegate.
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*
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* @see main.dart for what messages are getting sent from Flutter.
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*/
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class EngineBindings(activity: Activity, delegate: EngineBindingsDelegate, entrypoint: String) : DataModelObserver {
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val channel: MethodChannel
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val engine: FlutterEngine
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val delegate: EngineBindingsDelegate
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init {
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val app = activity.applicationContext as App
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// This has to be lazy to avoid creation before the FlutterEngineGroup.
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val dartEntrypoint =
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DartExecutor.DartEntrypoint(FlutterInjector.instance().flutterLoader().findAppBundlePath(), entrypoint)
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engine = app.engines.createAndRunEngine(activity, dartEntrypoint)
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this.delegate = delegate
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channel = MethodChannel(engine.dartExecutor.binaryMessenger, "multiple-flutters")
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}
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/**
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* This setups the messaging connections on the platform channel and the DataModel.
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*/
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fun attach() {
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DataModel.instance.addObserver(this)
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channel.invokeMethod("setCount", DataModel.instance.counter)
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channel.setMethodCallHandler { call, result ->
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when (call.method) {
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"incrementCount" -> {
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DataModel.instance.counter = DataModel.instance.counter + 1
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result.success(null)
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}
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"next" -> {
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this.delegate.onNext()
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result.success(null)
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}
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else -> {
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result.notImplemented()
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}
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}
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}
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}
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/**
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* This tears down the messaging connections on the platform channel and the DataModel.
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*/
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fun detach() {
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DataModel.instance.removeObserver(this)
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channel.setMethodCallHandler(null)
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}
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override fun onCountUpdate(newCount: Int) {
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channel.invokeMethod("setCount", newCount)
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}
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}

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