snapshot of https://github.com/flutter/samples.git (main, 2026-09-16; blobs > 131072B omitted)

add_to_app/multiple_flutters/README.md

@@ -0,0 +1,80 @@
+# multiple_flutters
+
+This is a sample that shows how to use the Flutter Engine Groups API to embed
+multiple instances of Flutter into an existing Android or iOS project.
+
+## Getting Started
+
+For iOS instructions, see:
+[multiple_flutters_ios](./multiple_flutters_ios/README.md).
+
+For Android instructions, see:
+[multiple_flutters_android](./multiple_flutters_android/README.md).
+
+## Requirements
+
+* Flutter -- after Flutter v2
+* Android
+  * Android Studio
+* iOS
+  * Xcode
+  * Cocoapods
+
+## Flutter Engine Group
+
+These examples use the Flutter Engine Group APIs on the host platform which
+allows engines to share memory and CPU intensive resources. This leads to easier
+embedding of Flutter into an existing app since multiple entrypoints can be
+maintained via a FlutterFragment on Android or a UIViewController on iOS.
+Before FlutterEngineGroup, users had to juggle the usage of a small number of
+engines judiciously.
+
+More info on those API's can be found in the source
+code:
+
+- iOS -
+  [FlutterEngineGroup.h](https://github.com/flutter/engine/blob/master/shell/platform/darwin/ios/framework/Headers/FlutterEngineGroup.h)
+- Android -
+  [FlutterEngineGroup.java](https://github.com/flutter/engine/blob/master/shell/platform/android/io/flutter/embedding/engine/FlutterEngineGroup.java)
+
+## Important Files
+
+### iOS
+
+- [DataModel.swift](./multiple_flutters_ios/MultipleFluttersIos/HostViewController.swift)
+  — Observable data model that is the source of truth for the host platform and Flutter.
+- [HostViewController.swift](./multiple_flutters_ios/MultipleFluttersIos/HostViewController.swift)
+  — A UIViewController that synchronizes to the DataModel.
+- [main.dart](./multiple_flutters_module/lib/main.dart) — The Flutter source
+  code.
+- [SingleFlutterViewController.swift](./multiple_flutters_ios/MultipleFluttersIos/SingleFlutterViewController.swift)
+  — A subclass of FlutterViewController that synchronizes with the DataModel.
+- [DoubleFlutterViewController.swift](./multiple_flutters_ios/MultipleFluttersIos/DoubleFlutterViewController.swift)
+  — A UIViewController that embeds multiple Flutter instances.
+
+### Android
+
+## Data Synchronization Description
+
+This sample code performs data synchronization to share data between the host
+platform and multiple instances of Flutter by combining the
+[Observer design pattern](https://en.wikipedia.org/wiki/Observer_pattern) and
+[Flutter platform channels](https://flutter.dev/docs/development/platform-integration/platform-channels).
+Here is how it works:
+
+- The definitive source of truth for the data lives in the host platform data
+  model.
+- Every host view displaying Flutter content maintains: a Flutter engine, a
+  bidirectional platform channel, and a subscription to the host data model.
+- Flutter instances maintain a copy of the data they are interested in reading,
+  and this data is seeded by the host when the instance is first displayed.
+- Mutations from Flutter code are sent to the host platform via the channel. The
+  host platform performs the mutations, and then notifies all host view
+  controllers and Flutter engines of the new value.
+- Mutations from host code happen directly on the data model who notifies host
+  view controllers and Flutter engines of the new value.
+
+This is just one possible way to synchronize the data between the host platform
+and multiple Flutter instances. A more complete implementation is proposed in
+the work of
+[flutter/issues/72030](https://github.com/flutter/flutter/issues/72030).

add_to_app/multiple_flutters/multiple_flutters_android/.gitignore

@@ -0,0 +1,15 @@
+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

add_to_app/multiple_flutters/multiple_flutters_android/README.md

@@ -0,0 +1,17 @@
+# multiple_flutters_android
+
+This is an add-to-app sample that uses the Flutter engine group API to host
+multiple instances of Flutter in the app.
+
+## Getting Started
+
+```sh
+cd ../multiple_flutters_module
+flutter pub get
+cd -
+open -a "Android Studio" multiple_flutters_android/ # macOS command
+# (build and run)
+```
+
+For more information see
+[multiple_flutters_module](../multiple_flutters_module/README.md).

add_to_app/multiple_flutters/multiple_flutters_android/app/.gitignore

@@ -0,0 +1 @@
+/build

add_to_app/multiple_flutters/multiple_flutters_android/app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+}
+
+android {
+    signingConfigs {
+        self {
+        }
+    }
+    compileSdk 36
+
+    defaultConfig {
+        applicationId "dev.flutter.multipleflutters"
+        minSdkVersion 24
+        targetSdk 36
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            signingConfig debug.signingConfig
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+    namespace 'dev.flutter.multipleflutters'
+}
+
+dependencies {
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation 'androidx.core:core-ktx:1.13.1'
+    implementation 'androidx.appcompat:appcompat:1.7.0'
+    implementation 'com.google.android.material:material:1.12.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
+    implementation project(':flutter')
+}

add_to_app/multiple_flutters/multiple_flutters_android/app/proguard-rules.pro

@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- Provide required visibility configuration for API level 30 and above -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.VIEW" />
+            <data android:scheme="https" />
+        </intent>
+    </queries>
+
+    <application
+        android:name=".App"
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.MultipleFlutters">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+        <activity
+            android:name=".SingleFlutterActivity"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize"
+            android:exported="true"
+            />
+        <activity
+            android:name=".DoubleFlutterActivity"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize"
+            android:exported="true"
+            />
+        <!-- Whether leave or clean up the VM after the last shell shuts down. If your want to let
+             your app destroy the last shell and re-create shells more quickly, set it to true,
+             otherwise if you want to clean up the memory of the leak VM, set it to false.
+             (This setting works after the Flutter 2.10 stable version.)
+             View https://github.com/flutter/flutter/issues/95903 for more detail. -->
+        <meta-data
+            android:name="io.flutter.embedding.android.LeakVM"
+            android:value="false"
+            />
+    </application>
+
+</manifest>

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

@@ -0,0 +1,18 @@
+package dev.flutter.multipleflutters
+
+import android.app.Application
+import io.flutter.embedding.engine.FlutterEngineGroup
+
+/**
+ * Application class for this app.
+ *
+ * This holds onto our engine group.
+ */
+class App : Application() {
+    lateinit var engines: FlutterEngineGroup
+
+    override fun onCreate() {
+        super.onCreate()
+        engines = FlutterEngineGroup(this)
+    }
+}

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

@@ -0,0 +1,41 @@
+package dev.flutter.multipleflutters
+
+import java.lang.ref.WeakReference
+
+/**
+ * Interface for getting notifications when the DataModel is updated.
+ */
+interface DataModelObserver {
+    fun onCountUpdate(newCount: Int)
+}
+
+/**
+ * A singleton/observable data model for the data shared between Flutter and the host platform.
+ *
+ * This is the definitive source of truth for all data.
+ */
+class DataModel {
+    companion object {
+        val instance = DataModel()
+    }
+
+    private val observers = mutableListOf<WeakReference<DataModelObserver>>()
+
+    public var counter = 0
+        set(value) {
+            field = value
+            for (observer in observers) {
+                observer.get()?.onCountUpdate(value)
+            }
+        }
+
+    fun addObserver(observer: DataModelObserver) {
+        observers.add(WeakReference(observer))
+    }
+
+    fun removeObserver(observer: DataModelObserver) {
+        observers.removeIf {
+            if (it.get() != null) it.get() == observer else true
+        }
+    }
+}

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

@@ -0,0 +1,91 @@
+package dev.flutter.multipleflutters
+
+import android.content.Intent
+import android.os.Bundle
+import android.widget.FrameLayout
+import android.widget.LinearLayout
+import androidx.fragment.app.FragmentActivity
+import androidx.fragment.app.FragmentManager
+import io.flutter.embedding.android.FlutterFragment
+import io.flutter.embedding.engine.FlutterEngineCache
+
+/**
+ * An activity that displays 2 FlutterFragments vertically.
+ */
+class DoubleFlutterActivity : FragmentActivity(), EngineBindingsDelegate {
+    private val topBindings: EngineBindings by lazy {
+        EngineBindings(activity = this, delegate = this, entrypoint = "topMain")
+    }
+    private val bottomBindings: EngineBindings by lazy {
+        EngineBindings(activity = this, delegate = this, entrypoint = "bottomMain")
+    }
+    private val numberOfFlutters = 2
+    private val engineCountStart : Int
+    private companion object {
+        var engineCounter = 0
+    }
+
+    init {
+        engineCountStart = engineCounter
+        engineCounter += numberOfFlutters
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val root = LinearLayout(this)
+        root.layoutParams = LinearLayout.LayoutParams(
+            LinearLayout.LayoutParams.MATCH_PARENT,
+            LinearLayout.LayoutParams.MATCH_PARENT
+        )
+        root.orientation = LinearLayout.VERTICAL
+        root.weightSum = numberOfFlutters.toFloat()
+
+        val fragmentManager: FragmentManager = supportFragmentManager
+
+        setContentView(root)
+
+        for (i in 0 until numberOfFlutters) {
+            val engineId = engineCountStart + i
+            val containerId = 12345 + engineId
+            val flutterContainer = FrameLayout(this)
+            root.addView(flutterContainer)
+            flutterContainer.id = containerId
+            flutterContainer.layoutParams = LinearLayout.LayoutParams(
+                FrameLayout.LayoutParams.MATCH_PARENT,
+                FrameLayout.LayoutParams.MATCH_PARENT,
+                1.0f
+            )
+            val engine = if (i == 0) topBindings.engine else bottomBindings.engine
+            FlutterEngineCache.getInstance().put(engineId.toString(), engine)
+            val flutterFragment =
+                FlutterFragment.withCachedEngine(engineId.toString()).build<FlutterFragment>()
+            fragmentManager
+                .beginTransaction()
+                .add(
+                        containerId,
+                        flutterFragment
+                )
+                .commit()
+        }
+
+        topBindings.attach()
+        bottomBindings.attach()
+    }
+
+    override fun onDestroy() {
+        for (i in 0 until numberOfFlutters) {
+            val engineId = engineCountStart + i
+            FlutterEngineCache.getInstance().remove(engineId.toString())
+        }
+
+        super.onDestroy()
+
+        bottomBindings.detach()
+        topBindings.detach()
+    }
+
+    override fun onNext() {
+        val flutterIntent = Intent(this, MainActivity::class.java)
+        startActivity(flutterIntent)
+    }
+}

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

@@ -0,0 +1,85 @@
+package dev.flutter.multipleflutters
+
+import android.app.Activity
+import io.flutter.FlutterInjector
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.embedding.engine.dart.DartExecutor
+import io.flutter.plugin.common.MethodChannel
+
+/**
+ * This interface represents the notifications an EngineBindings may be receiving from the Flutter
+ * instance.
+ *
+ * What methods this interface has depends on the messages that are sent over the EngineBinding's
+ * channel in `main.dart`.  Messages that interact with the DataModel are handled automatically
+ * by the EngineBindings.
+ *
+ * @see main.dart for what messages are getting sent from Flutter.
+ */
+interface EngineBindingsDelegate {
+    fun onNext()
+}
+
+/**
+ * This binds a FlutterEngine instance with the DataModel and a channel for communicating with that
+ * engine.
+ *
+ * Messages involving the DataModel are handled by the EngineBindings, other messages are forwarded
+ * to the EngineBindingsDelegate.
+ *
+ * @see main.dart for what messages are getting sent from Flutter.
+ */
+class EngineBindings(activity: Activity, delegate: EngineBindingsDelegate, entrypoint: String) :
+    DataModelObserver {
+    val channel: MethodChannel
+    val engine: FlutterEngine
+    val delegate: EngineBindingsDelegate
+
+    init {
+        val app = activity.applicationContext as App
+        // This has to be lazy to avoid creation before the FlutterEngineGroup.
+        val dartEntrypoint =
+            DartExecutor.DartEntrypoint(
+                FlutterInjector.instance().flutterLoader().findAppBundlePath(), entrypoint
+            )
+        engine = app.engines.createAndRunEngine(activity, dartEntrypoint)
+        this.delegate = delegate
+        channel = MethodChannel(engine.dartExecutor.binaryMessenger, "multiple-flutters")
+    }
+
+    /**
+     * This setups the messaging connections on the platform channel and the DataModel.
+     */
+    fun attach() {
+        DataModel.instance.addObserver(this)
+        channel.invokeMethod("setCount", DataModel.instance.counter)
+        channel.setMethodCallHandler { call, result ->
+            when (call.method) {
+                "incrementCount" -> {
+                    DataModel.instance.counter = DataModel.instance.counter + 1
+                    result.success(null)
+                }
+                "next" -> {
+                    this.delegate.onNext()
+                    result.success(null)
+                }
+                else -> {
+                    result.notImplemented()
+                }
+            }
+        }
+    }
+
+    /**
+     * This tears down the messaging connections on the platform channel and the DataModel.
+     */
+    fun detach() {
+        engine.destroy();
+        DataModel.instance.removeObserver(this)
+        channel.setMethodCallHandler(null)
+    }
+
+    override fun onCountUpdate(newCount: Int) {
+        channel.invokeMethod("setCount", newCount)
+    }
+}

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

@@ -0,0 +1,61 @@
+package dev.flutter.multipleflutters
+
+import android.content.Intent
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.view.View
+import android.widget.TextView
+
+/**
+ * The activity that uses standard platform UI APIs.
+ *
+ * This doesn't talk directly to or render Flutter content and represents a part of your app that
+ * would potentially already be written that wants to interface with Flutter.
+ */
+class MainActivity : AppCompatActivity(), DataModelObserver {
+    private lateinit var countView: TextView
+    private val mainActivityIdentifier: Int
+
+    private companion object {
+        /** A count that makes every other MainActivity have 1 or 2 Flutter instances. */
+        var mainActivityCount = 0
+    }
+
+    init {
+        mainActivityIdentifier = mainActivityCount
+        mainActivityCount += 1
+    }
+
+    /** Implemented from AppCompactActivity. */
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+        DataModel.instance.addObserver(this)
+        countView = findViewById(R.id.count)
+        countView.text = DataModel.instance.counter.toString()
+    }
+
+    /** Implemented from AppCompactActivity. */
+    override fun onDestroy() {
+        super.onDestroy()
+        DataModel.instance.removeObserver(this)
+    }
+
+    /** Event from `activity_main.xml`. */
+    fun onClickNext(view: View) {
+        val nextClass =
+            if (mainActivityIdentifier % 2 == 0) SingleFlutterActivity::class.java else DoubleFlutterActivity::class.java
+        val flutterIntent = Intent(this, nextClass)
+        startActivity(flutterIntent)
+    }
+
+    /** Event from `activity_main.xml`. */
+    fun onClickAdd(view: View) {
+        DataModel.instance.counter = DataModel.instance.counter + 1
+    }
+
+    /** Implemented from DataModelObserver. */
+    override fun onCountUpdate(newCount: Int) {
+        countView.text = newCount.toString()
+    }
+}

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

@@ -0,0 +1,37 @@
+package dev.flutter.multipleflutters
+
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+
+/**
+ * This is an Activity that displays one instance of Flutter.
+ *
+ * EngineBindings is used to bridge communication between the Flutter instance and the DataModel.
+ */
+class SingleFlutterActivity : FlutterActivity(), EngineBindingsDelegate {
+    private val engineBindings: EngineBindings by lazy {
+        EngineBindings(activity = this, delegate = this, entrypoint = "main")
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        engineBindings.attach()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        engineBindings.detach()
+    }
+
+    override fun provideFlutterEngine(context: Context): FlutterEngine? {
+        return engineBindings.engine
+    }
+
+    override fun onNext() {
+        val flutterIntent = Intent(this, MainActivity::class.java)
+        startActivity(flutterIntent)
+    }
+}

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <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">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        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"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/layout/activity_main.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <TextView
+        android:id="@+id/count"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="1dp"
+        android:layout_marginEnd="260dp"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/countLabel"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/countLabel"
+        android:layout_width="58dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:text="Count:"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <Button
+        android:id="@+id/button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="16dp"
+        android:onClick="onClickNext"
+        android:text="Next"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+    <Button
+        android:id="@+id/button2"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="16dp"
+        android:onClick="onClickAdd"
+        android:text="Add"
+        app:layout_constraintBottom_toTopOf="@+id/button"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/values-night/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.MultipleFlutters" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_200</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/values/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Multiple Flutters</string>
+</resources>

add_to_app/multiple_flutters/multiple_flutters_android/app/src/main/res/values/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.MultipleFlutters" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_500</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

add_to_app/multiple_flutters/multiple_flutters_android/build.gradle

@@ -0,0 +1,26 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+buildscript {
+    ext.kotlin_version = "1.8.22"
+    repositories {
+        google()
+        mavenCentral()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:8.9.0'
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+
+        // NOTE: Do not place your application dependencies here; they belong
+        // in the individual module build.gradle files
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+tasks.register('clean', Delete) {
+    delete rootProject.buildDir
+}

add_to_app/multiple_flutters/multiple_flutters_android/gradle.properties

@@ -0,0 +1,24 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Automatically convert third-party libraries to use AndroidX
+android.enableJetifier=true
+# Kotlin code style for this project: "official" or "obsolete":
+kotlin.code.style=official
+android.defaults.buildfeatures.buildconfig=true
+android.nonTransitiveRClass=false
+android.nonFinalResIds=false

add_to_app/multiple_flutters/multiple_flutters_android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,6 @@
+#Mon Dec 11 09:57:20 AEDT 2023
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

add_to_app/multiple_flutters/multiple_flutters_android/gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

add_to_app/multiple_flutters/multiple_flutters_android/gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

add_to_app/multiple_flutters/multiple_flutters_android/settings.gradle

@@ -0,0 +1,7 @@
+include ':app'
+rootProject.name = "Multiple Flutters"
+setBinding(new Binding([gradle: this]))                                // new
+evaluate(new File(                                                     // new
+        settingsDir.parentFile,                                              // new
+        './multiple_flutters_module/.android/include_flutter.groovy'                         // new
+))

add_to_app/multiple_flutters/multiple_flutters_ios/.gitignore

@@ -0,0 +1,6 @@
+MultipleFluttersIos.xcworkspace/xcuserdata
+MultipleFluttersIos.xcodeproj/project.xcworkspace/xcuserdata
+Pods/Pods.xcodeproj/xcuserdata
+MultipleFluttersIos.xcodeproj/xcuserdata
+Pods/
+MultipleFluttersIos.xcodeproj/xcshareddata/

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos.xcodeproj/project.pbxproj

@@ -0,0 +1,437 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 51;
+	objects = {
+
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+		};
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+			isa = PBXGroup;
+			children = (
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+				0D61B20025BB8FDF00A1A590 /* DataModel.swift */,
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+				0D61B1EA25BB8A2400A1A590 /* Assets.xcassets */,
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+				0D61B1EF25BB8A2400A1A590 /* Info.plist */,
+				0D61B20725BBEA9E00A1A590 /* SingleFlutterViewController.swift */,
+				0D61B20A25BBF88700A1A590 /* DoubleFlutterViewController.swift */,
+			);
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+		};
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+			);
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+			isa = PBXGroup;
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+
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+/* End PBXResourcesBuildPhase section */
+
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+		};
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+		};
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+		};
+		0D61B1F325BB8A2400A1A590 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 5EE6997543EAE7F85C674231 /* Pods-MultipleFluttersIos.debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				INFOPLIST_FILE = MultipleFluttersIos/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.MultipleFluttersIos;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		0D61B1F425BB8A2400A1A590 /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 4F02FEA4EA8C75406BC5FFC5 /* Pods-MultipleFluttersIos.release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				INFOPLIST_FILE = MultipleFluttersIos/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.flutter.MultipleFluttersIos;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		0D61B1D925BB8A2300A1A590 /* Build configuration list for PBXProject "MultipleFluttersIos" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				0D61B1F025BB8A2400A1A590 /* Debug */,
+				0D61B1F125BB8A2400A1A590 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		0D61B1F225BB8A2400A1A590 /* Build configuration list for PBXNativeTarget "MultipleFluttersIos" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				0D61B1F325BB8A2400A1A590 /* Debug */,
+				0D61B1F425BB8A2400A1A590 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 0D61B1D625BB8A2300A1A590 /* Project object */;
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:MultipleFluttersIos.xcodeproj">
+   </FileRef>
+   <FileRef
+      location = "group:Pods/Pods.xcodeproj">
+   </FileRef>
+</Workspace>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/AppDelegate.swift

@@ -0,0 +1,47 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import Flutter
+import UIKit
+
+/// The app's UIApplicationDelegate.
+@main
+class AppDelegate: UIResponder, UIApplicationDelegate {
+  let engines = FlutterEngineGroup(name: "multiple-flutters", project: nil)
+
+  func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    #if DEBUG
+      let isDebug = true
+    #else
+      let isDebug = false
+    #endif
+    if isDebug {
+      NSLog(
+        "📣 NOTICE: the memory and CPU costs for Flutter engine groups are significantly greater in debug builds.  See also: https://github.com/dart-lang/sdk/issues/36097"
+      )
+    } else {
+      NSLog(
+        "📣 NOTICE: the memory and CPU costs for Flutter engine groups are significantly less here than in debug builds.  See also: https://github.com/dart-lang/sdk/issues/36097"
+      )
+    }
+
+    return true
+  }
+
+  func application(
+    _ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession,
+    options: UIScene.ConnectionOptions
+  ) -> UISceneConfiguration {
+    return UISceneConfiguration(
+      name: "Default Configuration", sessionRole: connectingSceneSession.role)
+  }
+
+  func application(
+    _ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>
+  ) {
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/Assets.xcassets/AccentColor.colorset/Contents.json

@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/Assets.xcassets/Contents.json

@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+</document>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/Base.lproj/Main.storyboard

@@ -0,0 +1,116 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17506" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="zV5-X7-f4o">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17505"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="System colors in document resources" minToolsVersion="11.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--Navigation Controller-->
+        <scene sceneID="iJJ-8n-QPC">
+            <objects>
+                <navigationController id="zV5-X7-f4o" sceneMemberID="viewController">
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="NiM-Jj-k9k">
+                        <rect key="frame" x="0.0" y="44" width="414" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </navigationBar>
+                    <connections>
+                        <segue destination="BYZ-38-t0r" kind="relationship" relationship="rootViewController" id="PBq-fn-vqE"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="22r-TG-MDZ" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-1555" y="-191"/>
+        </scene>
+        <!--Host View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController storyboardIdentifier="NativeViewCount" id="BYZ-38-t0r" customClass="HostViewController" customModule="MultipleFluttersIos" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Count:" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="CgZ-JE-gda">
+                                <rect key="frame" x="20" y="437.5" width="51" height="21"/>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="1234" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="dKf-iz-CSn">
+                                <rect key="frame" x="79" y="437.5" width="39" height="21"/>
+                                <constraints>
+                                    <constraint firstAttribute="width" constant="39" id="Aw7-RN-dwx"/>
+                                </constraints>
+                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                <nil key="textColor"/>
+                                <nil key="highlightedColor"/>
+                            </label>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="vVY-o2-UDW">
+                                <rect key="frame" x="350" y="818" width="44" height="44"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="44" id="h7j-l3-taD"/>
+                                    <constraint firstAttribute="width" constant="44" id="sQd-lU-0zD"/>
+                                </constraints>
+                                <state key="normal" title="Next"/>
+                                <connections>
+                                    <action selector="onNext" destination="BYZ-38-t0r" eventType="touchUpInside" id="XN9-kg-pAi"/>
+                                </connections>
+                            </button>
+                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Ohd-Fe-iAE">
+                                <rect key="frame" x="350" y="772" width="44" height="44"/>
+                                <constraints>
+                                    <constraint firstAttribute="height" constant="44" id="8Nc-hA-ZbV"/>
+                                    <constraint firstAttribute="width" constant="44" id="P0Q-km-hJ3"/>
+                                </constraints>
+                                <state key="normal" title="Add"/>
+                                <connections>
+                                    <action selector="onAddCount" destination="BYZ-38-t0r" eventType="touchUpInside" id="QYB-J4-vI2"/>
+                                </connections>
+                            </button>
+                        </subviews>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                        <constraints>
+                            <constraint firstItem="CgZ-JE-gda" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" id="1Dz-Aq-10E"/>
+                            <constraint firstItem="vVY-o2-UDW" firstAttribute="top" secondItem="Ohd-Fe-iAE" secondAttribute="bottom" constant="2" id="EqG-G1-3gr"/>
+                            <constraint firstItem="vVY-o2-UDW" firstAttribute="bottom" secondItem="6Tk-OE-BBY" secondAttribute="bottom" id="IDv-xt-QVd"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="vVY-o2-UDW" secondAttribute="trailing" constant="20" id="IQ1-E7-q9T"/>
+                            <constraint firstItem="dKf-iz-CSn" firstAttribute="leading" secondItem="CgZ-JE-gda" secondAttribute="trailing" constant="8" symbolic="YES" id="ZKK-wt-eqr"/>
+                            <constraint firstItem="dKf-iz-CSn" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" id="hUq-Je-pdK"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="Ohd-Fe-iAE" secondAttribute="trailing" constant="20" id="wT9-j5-NMO"/>
+                            <constraint firstItem="CgZ-JE-gda" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="20" id="ybv-NA-2by"/>
+                        </constraints>
+                    </view>
+                    <navigationItem key="navigationItem" id="NPA-Os-dNw"/>
+                    <connections>
+                        <outlet property="countView" destination="dKf-iz-CSn" id="9dM-Hg-UMg"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-722" y="-192"/>
+        </scene>
+        <!--View Controller-->
+        <scene sceneID="e8d-wy-DfZ">
+            <objects>
+                <viewController id="EXG-G5-awH" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="3av-sG-Ibb">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <viewLayoutGuide key="safeArea" id="R4s-uY-wnW"/>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="xYB-oQ-Y1A" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="4" y="-192"/>
+        </scene>
+    </scenes>
+    <resources>
+        <systemColor name="systemBackgroundColor">
+            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
+        </systemColor>
+    </resources>
+</document>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/DataModel.swift

@@ -0,0 +1,56 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import Foundation
+
+/// A protocol that receives updates when the datamodel is changed.
+protocol DataModelObserver: AnyObject {
+  func onCountUpdate(newCount: Int64)
+}
+
+/// A wrapper object around a weak reference to an object that implements DataModelObserver.
+///
+/// This is required since you can't directly hold weak references to protocols in data structures.
+private struct DataModelObserverWrapper {
+  weak var wrapped: DataModelObserver?
+
+  init(_ wrapped: DataModelObserver) {
+    self.wrapped = wrapped
+  }
+}
+
+/// A singleton data model that is observable.
+class DataModel {
+  private var _count: Int64 = 0
+  var count: Int64 {
+    get {
+      return self._count
+    }
+    set {
+      self._count = newValue
+      for observer in observers {
+        if let wrapped = observer.wrapped {
+          wrapped.onCountUpdate(newCount: self._count)
+        }
+      }
+    }
+  }
+  private var observers: [DataModelObserverWrapper] = []
+  static let shared = DataModel()
+
+  func addObserver(observer: DataModelObserver) {
+    observers.append(DataModelObserverWrapper(observer))
+  }
+
+  func removeObserver(observer: DataModelObserver) {
+    observers.removeAll { (element: DataModelObserverWrapper) -> Bool in
+      if let wrapped = element.wrapped {
+        return wrapped === observer
+      } else {
+        // Handle observers who dealloc'd without removing themselves.
+        return true
+      }
+    }
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/DoubleFlutterViewController.swift

@@ -0,0 +1,29 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import UIKit
+
+/// A UIViewController that hosts two instances of SingleFlutterViewController, splitting the screen
+/// between them.
+class DoubleFlutterViewController: UIViewController {
+  private let topFlutter: SingleFlutterViewController = SingleFlutterViewController(
+    withEntrypoint: "topMain")
+  private let bottomFlutter: SingleFlutterViewController = SingleFlutterViewController(
+    withEntrypoint: "bottomMain")
+
+  override func viewDidLoad() {
+    addChild(topFlutter)
+    addChild(bottomFlutter)
+    let safeFrame = self.view.safeAreaLayoutGuide.layoutFrame
+    let halfHeight = safeFrame.height / 2.0
+    topFlutter.view.frame = CGRect(
+      x: safeFrame.minX, y: safeFrame.minY, width: safeFrame.width, height: halfHeight)
+    bottomFlutter.view.frame = CGRect(
+      x: safeFrame.minX, y: topFlutter.view.frame.maxY, width: safeFrame.width, height: halfHeight)
+    self.view.addSubview(topFlutter.view)
+    self.view.addSubview(bottomFlutter.view)
+    topFlutter.didMove(toParent: self)
+    bottomFlutter.didMove(toParent: self)
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/HostViewController.swift

@@ -0,0 +1,43 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import Flutter
+import UIKit
+
+/// UIViewController associated with the NativeViewCount storyboard scene.
+class HostViewController: UIViewController, DataModelObserver {
+  @IBOutlet weak var countView: UILabel!
+
+  deinit {
+    DataModel.shared.removeObserver(observer: self)
+  }
+
+  func onCountUpdate(newCount: Int64) {
+    self.countView.text = String(format: "%d", newCount)
+  }
+
+  override func viewDidLoad() {
+    super.viewDidLoad()
+    DataModel.shared.addObserver(observer: self)
+    onCountUpdate(newCount: DataModel.shared.count)
+  }
+
+  @IBAction func onAddCount() {
+    DataModel.shared.count = DataModel.shared.count + 1
+  }
+
+  @IBAction func onNext() {
+    let navController = self.navigationController!
+    // Based on the number of view controllers in the stack we push a
+    // SingleFlutterViewController or DoubleFlutterViewController to alternatve
+    // between the two.
+    if navController.viewControllers.count % 4 == 1 {
+      let vc = SingleFlutterViewController(withEntrypoint: nil)
+      navController.pushViewController(vc, animated: true)
+    } else {
+      let vc = DoubleFlutterViewController()
+      navController.pushViewController(vc, animated: true)
+    }
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/Info.plist

@@ -0,0 +1,66 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>Default Configuration</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/SceneDelegate.swift

@@ -0,0 +1,32 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import UIKit
+
+/// The UIWindowSceneDelegate for the app.
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+  var window: UIWindow?
+
+  func scene(
+    _ scene: UIScene, willConnectTo session: UISceneSession,
+    options connectionOptions: UIScene.ConnectionOptions
+  ) {
+    guard let _ = (scene as? UIWindowScene) else { return }
+  }
+
+  func sceneDidDisconnect(_ scene: UIScene) {
+  }
+
+  func sceneDidBecomeActive(_ scene: UIScene) {
+  }
+
+  func sceneWillResignActive(_ scene: UIScene) {
+  }
+
+  func sceneWillEnterForeground(_ scene: UIScene) {
+  }
+
+  func sceneDidEnterBackground(_ scene: UIScene) {
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/MultipleFluttersIos/SingleFlutterViewController.swift

@@ -0,0 +1,59 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import Flutter
+import FlutterPluginRegistrant
+import Foundation
+
+/// A FlutterViewController intended for the MyApp widget in the Flutter module.
+///
+/// This view controller maintains a connection to the Flutter instance and syncs it with the
+/// datamodel.  In practice you should override the other init methods or switch to composition
+/// instead of inheritence.
+class SingleFlutterViewController: FlutterViewController, DataModelObserver {
+  private var channel: FlutterMethodChannel?
+
+  init(withEntrypoint entryPoint: String?) {
+    let appDelegate: AppDelegate = UIApplication.shared.delegate as! AppDelegate
+    let newEngine = appDelegate.engines.makeEngine(withEntrypoint: entryPoint, libraryURI: nil)
+    GeneratedPluginRegistrant.register(with: newEngine)
+    super.init(engine: newEngine, nibName: nil, bundle: nil)
+    DataModel.shared.addObserver(observer: self)
+  }
+
+  deinit {
+    DataModel.shared.removeObserver(observer: self)
+  }
+
+  required init(coder aDecoder: NSCoder) {
+    fatalError("init(coder:) has not been implemented")
+  }
+
+  func onCountUpdate(newCount: Int64) {
+    if let channel = channel {
+      channel.invokeMethod("setCount", arguments: newCount)
+    }
+  }
+
+  override func viewDidLoad() {
+    super.viewDidLoad()
+    channel = FlutterMethodChannel(
+      name: "multiple-flutters", binaryMessenger: self.engine!.binaryMessenger)
+    channel!.invokeMethod("setCount", arguments: DataModel.shared.count)
+    let navController = self.navigationController!
+    channel!.setMethodCallHandler { (call: FlutterMethodCall, result: @escaping FlutterResult) in
+      if call.method == "incrementCount" {
+        DataModel.shared.count = DataModel.shared.count + 1
+        result(nil)
+      } else if call.method == "next" {
+        let storyboard = UIStoryboard(name: "Main", bundle: nil)
+        let vc = storyboard.instantiateViewController(withIdentifier: "NativeViewCount")
+        navController.pushViewController(vc, animated: true)
+        result(nil)
+      } else {
+        result(FlutterMethodNotImplemented)
+      }
+    }
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_ios/Podfile

@@ -0,0 +1,15 @@
+# Copyright 2021 The Flutter team. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+flutter_application_path = '../multiple_flutters_module'
+load File.join(flutter_application_path, '.ios', 'Flutter', 'podhelper.rb')
+
+target 'MultipleFluttersIos' do
+  use_frameworks!
+  install_all_flutter_pods(flutter_application_path)
+end
+
+post_install do |installer|
+  flutter_post_install(installer) if defined?(flutter_post_install)
+end

add_to_app/multiple_flutters/multiple_flutters_ios/README.md

@@ -0,0 +1,17 @@
+# multiple_flutters_ios
+
+This is an add-to-app sample that uses the Flutter Engine Group API to host
+multiple instances of Flutter in an iOS app.
+
+## Getting Started
+
+```sh
+cd ../multiple_flutters_module
+flutter pub get
+cd -
+pod install
+open MultipleFluttersIos.xcworkspace
+# (build and run)
+```
+
+For more information see: [multiple_flutters/README.md](../README.md)

add_to_app/multiple_flutters/multiple_flutters_module/.gitignore

@@ -0,0 +1,48 @@
+.DS_Store
+.dart_tool/
+
+.packages
+.pub/
+
+.idea/
+.vagrant/
+.sconsign.dblite
+.svn/
+
+*.swp
+profile
+
+DerivedData/
+
+.generated/
+
+*.pbxuser
+*.mode1v3
+*.mode2v3
+*.perspectivev3
+
+!default.pbxuser
+!default.mode1v3
+!default.mode2v3
+!default.perspectivev3
+
+xcuserdata
+
+*.moved-aside
+
+*.pyc
+*sync/
+Icon?
+.tags*
+
+build/
+.android/
+.ios/
+.flutter-plugins
+.flutter-plugins-dependencies
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json

add_to_app/multiple_flutters/multiple_flutters_module/.metadata

@@ -0,0 +1,10 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 1d3f6971600f6e3fb144a30fab2b889e34af0c22
+  channel: master
+
+project_type: module

add_to_app/multiple_flutters/multiple_flutters_module/README.md

@@ -0,0 +1,5 @@
+# multiple_flutters_module
+
+This is the Flutter module that is embedded in the `multiple_flutters` projects.
+
+See also: [multiple_flutters/README.md](../README.md)

add_to_app/multiple_flutters/multiple_flutters_module/analysis_options.yaml

@@ -0,0 +1 @@
+include: ../../../analysis_options.yaml

add_to_app/multiple_flutters/multiple_flutters_module/lib/main.dart

@@ -0,0 +1,111 @@
+// Copyright 2021 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:url_launcher/url_launcher.dart' as launcher;
+
+void main() => runApp(const MyApp(color: Colors.blue));
+
+@pragma('vm:entry-point')
+void topMain() => runApp(const MyApp(color: Colors.green));
+
+@pragma('vm:entry-point')
+void bottomMain() => runApp(const MyApp(color: Colors.purple));
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key, required this.color});
+
+  final MaterialColor color;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Flutter Demo',
+      theme: ThemeData(
+        colorSchemeSeed: color,
+        appBarTheme: AppBarTheme(
+          backgroundColor: color,
+          foregroundColor: Colors.white,
+          elevation: 8,
+        ),
+      ),
+      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+    );
+  }
+}
+
+class MyHomePage extends StatefulWidget {
+  const MyHomePage({super.key, required this.title});
+  final String title;
+
+  @override
+  State<MyHomePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<MyHomePage> {
+  int? _counter = 0;
+  late MethodChannel _channel;
+
+  @override
+  void initState() {
+    super.initState();
+    _channel = const MethodChannel('multiple-flutters');
+    _channel.setMethodCallHandler((call) async {
+      if (call.method == "setCount") {
+        // A notification that the host platform's data model has been updated.
+        setState(() {
+          _counter = call.arguments as int?;
+        });
+      } else {
+        throw Exception('not implemented ${call.method}');
+      }
+    });
+  }
+
+  void _incrementCounter() {
+    // Mutations to the data model are forwarded to the host platform.
+    _channel.invokeMethod<void>("incrementCount", _counter);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text(widget.title)),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            const Text('You have pushed the button this many times:'),
+            Text(
+              '$_counter',
+              style: Theme.of(context).textTheme.headlineMedium,
+            ),
+            TextButton(
+              onPressed: _incrementCounter,
+              child: const Text('Add'),
+            ),
+            TextButton(
+              onPressed: () {
+                _channel.invokeMethod<void>("next", _counter);
+              },
+              child: const Text('Next'),
+            ),
+            ElevatedButton(
+              onPressed: () async {
+                // Use the url_launcher plugin to open the Flutter docs in
+                // a browser.
+                final url = Uri.parse('https://flutter.dev/docs');
+                if (await launcher.canLaunchUrl(url)) {
+                  await launcher.launchUrl(url);
+                }
+              },
+              child: const Text('Open Flutter Docs'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

add_to_app/multiple_flutters/multiple_flutters_module/pubspec.yaml

@@ -0,0 +1,28 @@
+name: multiple_flutters_module
+description: A module that is embedded in the multiple_flutters_ios and multiple_flutters_android sample code.
+version: 1.0.0+1
+resolution: workspace
+
+environment:
+  sdk: ^3.9.0-0
+
+dependencies:
+  flutter:
+    sdk: flutter
+  url_launcher: ^6.0.6
+
+  cupertino_icons: ^1.0.0
+
+dev_dependencies:
+  analysis_defaults:
+    path: ../../../analysis_defaults
+  flutter_test:
+    sdk: flutter
+
+flutter:
+  uses-material-design: true
+
+  module:
+    androidX: true
+    androidPackage: com.example.multiple_flutters_module
+    iosBundleIdentifier: com.example.multipleFluttersModule