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

platform_channels/android/app/build.gradle

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+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+android {
+    namespace "dev.flutter.platform_channels"
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "dev.flutter.platform_channels"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation 'com.google.code.gson:gson:2.8.6'
+}

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

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

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

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

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

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+// Copyright 2020 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.
+
+package dev.flutter.platform_channels
+
+import android.hardware.Sensor
+import android.hardware.SensorEvent
+import android.hardware.SensorEventListener
+import android.hardware.SensorManager
+import io.flutter.plugin.common.EventChannel
+
+class AccelerometerStreamHandler(sManager: SensorManager, s: Sensor) : EventChannel.StreamHandler, SensorEventListener {
+    private val sensorManager: SensorManager = sManager
+    private val accelerometerSensor: Sensor = s
+    private lateinit var eventSink: EventChannel.EventSink
+
+    override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
+        if (events != null) {
+            eventSink = events
+            sensorManager.registerListener(this, accelerometerSensor, SensorManager.SENSOR_DELAY_UI)
+        }
+    }
+
+    override fun onCancel(arguments: Any?) {
+        sensorManager.unregisterListener(this)
+    }
+
+    override fun onAccuracyChanged(sensor: Sensor?, accuracy: Int) {}
+
+    override fun onSensorChanged(sensorEvent: SensorEvent?) {
+        if (sensorEvent != null) {
+            val axisValues = listOf(sensorEvent.values[0], sensorEvent.values[1], sensorEvent.values[2])
+            eventSink.success(axisValues)
+        } else {
+            eventSink.error("DATA_UNAVAILABLE", "Cannot get accelerometer data", null)
+        }
+    }
+}

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

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+// Copyright 2020 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.
+
+package dev.flutter.platform_channels
+
+import android.content.Context
+import android.hardware.Sensor
+import android.hardware.SensorManager
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.*
+import java.io.InputStream
+import java.nio.ByteBuffer
+
+class MainActivity : FlutterActivity() {
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        // Creates a MethodChannel as soon as the FlutterEngine is attached to
+        // the Activity, and registers a MethodCallHandler. The Method.setMethodCallHandler
+        // is responsible to register a MethodCallHandler to handle the incoming calls.
+
+        // The call parameter of MethodCallHandler has information about the incoming call,
+        // like method name, and arguments. The result parameter of MethodCallHandler is
+        // responsible to send the results of the call.
+        MethodChannel(flutterEngine.dartExecutor, "methodChannelDemo")
+                .setMethodCallHandler { call, result ->
+                    val count: Int? = call.argument<Int>("count")
+
+                    if (count == null) {
+                        result.error("INVALID ARGUMENT", "Value of count cannot be null", null)
+                    } else {
+                        when (call.method) {
+                            "increment" -> result.success(count + 1)
+                            "decrement" -> result.success(count - 1)
+                            else -> result.notImplemented()
+                        }
+                    }
+                }
+
+        val sensorManger: SensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
+        val accelerometerSensor: Sensor = sensorManger.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
+        EventChannel(flutterEngine.dartExecutor, "eventChannelDemo")
+                .setStreamHandler(AccelerometerStreamHandler(sensorManger, accelerometerSensor))
+
+        // Registers a MessageHandler for BasicMessageChannel to receive a message from Dart and send
+        // image data in reply.
+        BasicMessageChannel(flutterEngine.dartExecutor, "platformImageDemo", StandardMessageCodec())
+                .setMessageHandler { message, reply ->
+                    if (message == "getImage") {
+                        val inputStream: InputStream = assets.open("eat_new_orleans.jpg")
+                        reply.reply(inputStream.readBytes())
+                    }
+                }
+
+        val petList = mutableListOf<Map<String, String>>()
+        val gson = Gson()
+
+        // A BasicMessageChannel for sending petList to Dart.
+        val stringCodecChannel = BasicMessageChannel(flutterEngine.dartExecutor, "stringCodecDemo", StringCodec.INSTANCE)
+
+        // Registers a MessageHandler for BasicMessageChannel to receive pet details to be
+        // added in petList and send the it back to Dart using stringCodecChannel.
+        BasicMessageChannel(flutterEngine.dartExecutor, "jsonMessageCodecDemo", JSONMessageCodec.INSTANCE)
+                .setMessageHandler { message, reply ->
+                    petList.add(0, gson.fromJson(message.toString(), object : TypeToken<Map<String, String>>() {}.type))
+                    stringCodecChannel.send(gson.toJson(mapOf("petList" to petList)))
+                }
+
+        // Registers a MessageHandler for BasicMessageChannel to receive the index of pet
+        // details to be removed from the petList and send the petList back to Dart using
+        // stringCodecChannel. If the index is not in the range of petList, we send null
+        // back to Dart.
+        BasicMessageChannel(flutterEngine.dartExecutor, "binaryCodecDemo", BinaryCodec.INSTANCE)
+                .setMessageHandler { message, reply ->
+                    val index = String(message!!.array()).toInt()
+                    if (index >= 0 && index < petList.size) {
+                        petList.removeAt(index)
+                        val replyMessage = "Removed Successfully"
+                        reply.reply(ByteBuffer.allocateDirect(replyMessage.toByteArray().size).put(replyMessage.toByteArray()))
+                        stringCodecChannel.send(gson.toJson(mapOf("petList" to petList)))
+                    } else {
+                        reply.reply(null)
+                    }
+                }
+    }
+}

platform_channels/android/app/src/main/res/drawable-v21/launch_background.xml

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

platform_channels/android/app/src/main/res/drawable/launch_background.xml

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

platform_channels/android/app/src/main/res/values-night/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

platform_channels/android/app/src/main/res/values/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

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

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>