android，flutter混合开发，通信，传参

文章目录 app效果2.修改 Android 项目的 settings.gradle，添加 Flutter module3. 在 Android app 的 build.gradle 中添加依赖4. 原生和flutter_module通信BasePlugin5. io.flutter.embedding.engine.plugins.util.GeneratedPluginRegister 自动注册插件6 手动注册7. 通信关闭flutter页面8. dartEntrypointArgs传入参数9. 通信传入参数9.1 发送参数9.1 接收参数 10. android代码11 源码

app效果 #### 1. 创建flutter_module > File->New->New Flutter Project > name为flutter_module > 选择project type为module 2.修改 Android 项目的 settings.gradle，添加 Flutter module pluginManagement { repositories { google { content { includeGroupByRegex("com\\.android.*") includeGroupByRegex("com\\.google.*") includeGroupByRegex("androidx.*") } } mavenCentral() gradlePluginPortal() } } dependencyResolutionManagement { repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS) repositories { google() mavenCentral() maven(url = " storage.googleapis /download.flutter.io") } } rootProject.name = "hunheandroid" include(":app") //主要是这一句 apply(from = "../flutter_module/.android/include_flutter.groovy") 3. 在 Android app 的 build.gradle 中添加依赖 dependencies { implementation(project(":flutter")) } 4. 原生和flutter_module通信BasePlugin

参考文章生成对应的io/flutter/plugins/Messages.g.kt 用pigeon kotlin swift写一个自己的插件 拷贝BasePlugin

package io.flutter.plugins import android.app.Activity import android.util.Log import androidx.annotation.NonNull import io.flutter.embedding.engine.plugins.FlutterPlugin import io.flutter.embedding.engine.plugins.activity.ActivityAware import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding /** BasePlugin */ /** BasePlugin */ class BasePlugin : FlutterPlugin, HostMessageApi, ActivityAware { companion object { private var flutterMessageApi: FlutterMessageApi? = null fun getFlutterMessageApi(): FlutterMessageApi? { return flutterMessageApi } } private var activity: Activity? = null private var tag = "BasePlugin" override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) { Log.e(tag, "onAttachedToEngine-start") HostMessageApi.setUp(flutterPluginBinding.binaryMessenger, this) flutterMessageApi = FlutterMessageApi(flutterPluginBinding.binaryMessenger) Log.e(tag, "onAttachedToEngine-end") } override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) { HostMessageApi.setUp(binding.binaryMessenger, null) } override fun flutter2Native(message: String, type: Long): String { print("flutter2Native=message=start=>$message=type=$type") return "flutter2Native=message=$message=type=$type" } override fun flutter2NativeAsync( message: String, type: Long, callback: (Result<String>) -> Unit ) { print("flutter2NativeAsync=message=$message=type=$type") callback(Result.success("flutter2NativeAsync=message=$message=type=$type")) if (type == 1L) { closeCurrentActivity() } } private fun closeCurrentActivity() { activity?.finish() } override fun onAttachedToActivity(binding: ActivityPluginBinding) { this.activity = binding.activity } override fun onDetachedFromActivityForConfigChanges() { } override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) { } override fun onDetachedFromActivity() { this.activity = null } } 5. io.flutter.embedding.engine.plugins.util.GeneratedPluginRegister 自动注册插件 public static void registerGeneratedPlugins(@NonNull FlutterEngine flutterEngine) { try { Class<?> generatedPluginRegistrant = Class.forName("io.flutter.plugins.GeneratedPluginRegistrant"); Method registrationMethod = generatedPluginRegistrant.getDeclaredMethod("registerWith", FlutterEngine.class); registrationMethod.invoke(null, flutterEngine); } catch (Exception e) { Log.e( TAG, "Tried to automatically register plugins with FlutterEngine (" + flutterEngine + ") but could not find or invoke the GeneratedPluginRegistrant."); Log.e(TAG, "Received exception while registering", e); } } package io.flutter.plugins; import androidx.annotation.Keep; import androidx.annotation.NonNull; import io.flutter.Log; import io.flutter.embedding.engine.FlutterEngine; /** * Generated file. Do not edit. * This file is generated by the Flutter tool based on the * plugins that support the Android platform. */ @Keep public final class GeneratedPluginRegistrant { private static final String TAG = "GeneratedPluginRegistrant"; public static void registerWith(@NonNull FlutterEngine flutterEngine) { try { Log.e(TAG, "registerWith-start"); flutterEngine.getPlugins().add(new BasePlugin()); Log.e(TAG, "registerWith-end"); } catch (Exception e) { Log.e(TAG, "Error registering plugin base_plugin, com.app.base_plugin.BasePlugin", e); } } } 6 手动注册

flutterEngine.getPlugins().add(new BasePlugin());

7. 通信关闭flutter页面

使用flutter和原生通信，在收到消息以后，关闭当前页面 BasePlugin实现ActivityAware，获取到activity 在收到flutter传入进来的消息的时候关闭activity

8. dartEntrypointArgs传入参数 //跳转带入参数 val initialRoute = listOf( "aaa", "bbbb" ) startActivity( withNewEngine() .dartEntrypointArgs(initialRoute) .build(this) ) //args就是传入的参数 void main(List<String> args){ print("args=$args"); runApp(const MyApp()); } 9. 通信传入参数 9.1 发送参数 val initialRoute = listOf( "/page2", "bbbb" ) BasePlugin.getFlutterMessageApi()?.native2Flutter(initialRoute.joinToString("#"), 1){ Log.e(tag, "flutter2NativeAsync: $it") FlutterLibrary.startFlutterPage(this) } 9.1 接收参数 class RouterPage extends StatefulWidget { const RouterPage({super.key}); @override State<RouterPage> createState() => _RouterPageState(); } class _RouterPageState extends State<RouterPage> implements FlutterMessageApi { late String args; @override void initState() { super.initState(); FlutterMessageApi.setUp(this); } @override String native2Flutter(String message, int type) { print("native2Flutter=$message $type"); setState(() { args = message; }); return "我是原生调用flutter方法返回的值=》native2Flutter"; } @override Future<String> native2FlutterAsync(String message, int type) { args = message; print("native2Flutter=$message $type"); return Future.value("我是原生调用flutter方法返回的值=》native2FlutterAsync"); } @override Widget build(BuildContext context) { // final value = widget.args.isNotEmpty ? widget.args[0] : "/"; if (args.isEmpty||!args.contains("#")) { return MyHomePage(title: "首页"); } final value = args.split("#").first; switch (value) { case '/page2': return SecondPage(); } print("_RouterPageState=build"); return MyHomePage(title: "首页"); } } class MyHomePage extends StatefulWidget { const MyHomePage({super.key, required this.title}); final String title; @override State<MyHomePage> createState() => _MyHomePageState(); } class _MyHomePageState extends State<MyHomePage> { int _counter = 0; void _incrementCounter() { setState(() { _counter++; }); } @override void initState() { super.initState(); } @override Widget build(BuildContext context) { print("_MyHomePageState=build"); return Scaffold( appBar: AppBar(title: Text(widget.title), leading: BackButton()), body: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ TextButton( onPressed: () { BasePlugin.flutter2NativeAsync("flutter2NativeAsync", 1).then(( value, ) { print("flutter2NativeAsync=$value"); }); }, child: Text('flutter2NativeAsync'), ), TextButton( onPressed: () { Navigator.of(context).pushNamed("/page2"); }, child: Text('flutter2NativeAsync'), ), const Text('You have pushed the button this many times:'), Text( '$_counter', style: Theme.of(context).textTheme.headlineMedium, ), ], ), ), floatingActionButton: FloatingActionButton( onPressed: _incrementCounter, tooltip: 'Increment', child: const Icon(Icons.add), ), // This trailing comma makes auto-formatting nicer for build methods. ); } } class SecondPage extends StatelessWidget { const SecondPage({super.key}); @override Widget build(BuildContext context) { print("SecondPage=build"); return Scaffold( appBar: AppBar(title: Text("SecondPage")), body: Center( child: TextButton( onPressed: () { Navigator.of(context).pop(); }, child: Text('关闭'), ), ), ); } } 10. android代码 package com.example.hunheandroid import android.app.Application import android.content.Context import android.content.Intent import io.flutter.embedding.android.FlutterActivity import io.flutter.embedding.engine.FlutterEngine import io.flutter.embedding.engine.FlutterEngineCache import io.flutter.embedding.engine.FlutterEngineGroup import io.flutter.embedding.engine.dart.DartExecutor import io.flutter.plugins.BasePlugin const val ENGINE_ID = "my_engine_id" object FlutterLibrary { fun init(application: Application) { FlutterEngineManager.getInstance().init(application) } fun startFlutterPage(context: Context) { val intent = FlutterActivity .withCachedEngine(ENGINE_ID) .build(context).addFlags(Intent.FLAG_ACTIVITY_NEW_TASK) context.startActivity(intent) } } // FlutterEngineManager.kt class FlutterEngineManager private constructor() { private lateinit var engineGroup: FlutterEngineGroup private var engine: FlutterEngine? = null companion object { private var instance: FlutterEngineManager? = null fun getInstance(): FlutterEngineManager { return instance ?: synchronized(this) { instance ?: FlutterEngineManager().also { instance = it } } } } fun init(application: Application) { engineGroup = FlutterEngineGroup(application) engine = engineGroup.createAndRunEngine( application, DartExecutor.DartEntrypoint.createDefault() ) FlutterEngineCache.getInstance().put(ENGINE_ID, engine) engine!!.plugins.add(BasePlugin()) } fun getEngine(): FlutterEngine? { return engine } fun destroyEngine() { engine?.destroy() engine = null } } class GoFlutterActivity : FlutterActivity(), HostMessageApi { private val tag = "GoFlutterActivity" private lateinit var binding: ActivityGoFlutterBinding override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) binding = ActivityGoFlutterBinding.inflate(layoutInflater) setContentView(binding.root) binding.goFlutter.setOnClickListener { //跳转到flutter val initialRoute = listOf( // Map 形式的参数 "/", "aaaa" ) BasePlugin.getFlutterMessageApi()?.native2Flutter(initialRoute.joinToString("#"), 1) { Log.e(tag, "flutter2NativeAsync: $it") FlutterLibrary.startFlutterPage(this) } } binding.goFlutter2.setOnClickListener { //跳转到flutter val initialRoute = listOf( // Map 形式的参数 "/page2", "bbbb" ) BasePlugin.getFlutterMessageApi()?.native2Flutter(initialRoute.joinToString("#"), 1) { Log.e(tag, "flutter2NativeAsync: $it") FlutterLibrary.startFlutterPage(this) } } } override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) { Log.e(tag, "configureFlutterEngine") // GeneratedPluginRegistrant.registerWith(flutterEngine) } override fun flutter2Native(message: String, type: Long): String { Log.e(tag, "$message$type") return "我是flutter调用原生方法的返回值=》flutter2Native" } override fun flutter2NativeAsync( message: String, type: Long, callback: (Result<String>) -> Unit ) { Log.e(tag, "$message$type") callback(Result.success("我是flutter调用原生方法的返回值=》flutter2NativeAsync")) } } 11 源码

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