Flutter 与 Android(安卓)相互调用、传递参数
16lz
2021-12-04
Flutter 调用原生
Android 定义插件
class MyFlutterPlugin implements MethodChannel.MethodCallHandler { private final Activity activity; public MyFlutterPlugin(Activity activity) { this.activity = activity; } @Override public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) { if (methodCall.method.equals("getUser")) { Integer userId = methodCall.argument("userId"); String mockUser = String.format("{\"name\":\"Wiki\",\"id\":%s}", userId); result.success(mockUser); } } public static void registerWith(PluginRegistry registry) { String CHANNEL = "com.example.flutter_app/plugin"; PluginRegistry.Registrar registrar = registry.registrarFor(CHANNEL); MethodChannel methodChannel = new MethodChannel(registrar.messenger(), CHANNEL); MyFlutterPlugin myFlutterPlugin = new MyFlutterPlugin(registrar.activity()); methodChannel.setMethodCallHandler(myFlutterPlugin); }}Android 插件注册
public class MainActivity extends FlutterActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); GeneratedPluginRegistrant.registerWith(this); MyFlutterPlugin.registerWith(this); }}Flutter 调用原生插件
static const myPlugin = const MethodChannel('com.example.flutter_app/plugin'); void getUser() async { Map map = {"userId": 101}; String result = await myPlugin.invokeMethod("getUser", map); print(result); } 原生调用 Flutter
Android 定义插件
class MyFlutterEventPlugin implements EventChannel.StreamHandler { public EventChannel.EventSink eventSink; public static MyFlutterEventPlugin registerWith(PluginRegistry registry) { String CHANNEL = "com.example.flutter_app/event_plugin"; PluginRegistry.Registrar registrar = registry.registrarFor(CHANNEL); EventChannel eventChannel = new EventChannel(registrar.messenger(), CHANNEL); MyFlutterEventPlugin myFlutterEventPlugin = new MyFlutterEventPlugin(); eventChannel.setStreamHandler(myFlutterEventPlugin); return myFlutterEventPlugin; } @Override public void onListen(Object o, EventChannel.EventSink eventSink) { this.eventSink = eventSink; } @Override public void onCancel(Object o) { }}Android 插件注册 & 调用
public class MainActivity extends FlutterActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); GeneratedPluginRegistrant.registerWith(this); MyFlutterPlugin.registerWith(this); MyFlutterEventPlugin eventPlugin = MyFlutterEventPlugin.registerWith(this); new Thread(new Runnable() { @Override public void run() { int counter = 0; while (true){ try { if (eventPlugin.eventSink != null) { eventPlugin.eventSink.success(counter++); } Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); eventPlugin.eventSink.error("计时器异常","计时器异常",e.getMessage()); } } } }).start(); }}Flutter 注册监听器接收来自原生的消息
static const myEventPlugin = const EventChannel('com.example.flutter_app/event_plugin'); @override void initState() { super.initState(); myEventPlugin.receiveBroadcastStream().listen(_onEvent, onError: _onError); } void _onEvent(Object event) { print("onEvent: $event"); } void _onError(Object error) { print("onError: $error"); }完整代码
Android
public class MainActivity extends FlutterActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); GeneratedPluginRegistrant.registerWith(this); MyFlutterPlugin.registerWith(this); MyFlutterEventPlugin eventPlugin = MyFlutterEventPlugin.registerWith(this); new Thread(new Runnable() { @Override public void run() { int counter = 0; while (true){ try { if (eventPlugin.eventSink != null) { eventPlugin.eventSink.success(counter++); } Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); eventPlugin.eventSink.error("计时器异常","计时器异常",e.getMessage()); } } } }).start(); }}class MyFlutterPlugin implements MethodChannel.MethodCallHandler { private final Activity activity; public MyFlutterPlugin(Activity activity) { this.activity = activity; } @Override public void onMethodCall(MethodCall methodCall, MethodChannel.Result result) { if (methodCall.method.equals("getUser")) { Integer userId = methodCall.argument("userId"); String mockUser = String.format("{\"name\":\"Wiki\",\"id\":%s}", userId); result.success(mockUser); } } public static void registerWith(PluginRegistry registry) { String CHANNEL = "com.example.flutter_app/plugin"; PluginRegistry.Registrar registrar = registry.registrarFor(CHANNEL); MethodChannel methodChannel = new MethodChannel(registrar.messenger(), CHANNEL); MyFlutterPlugin myFlutterPlugin = new MyFlutterPlugin(registrar.activity()); methodChannel.setMethodCallHandler(myFlutterPlugin); }}class MyFlutterEventPlugin implements EventChannel.StreamHandler { public EventChannel.EventSink eventSink; public static MyFlutterEventPlugin registerWith(PluginRegistry registry) { String CHANNEL = "com.example.flutter_app/event_plugin"; PluginRegistry.Registrar registrar = registry.registrarFor(CHANNEL); EventChannel eventChannel = new EventChannel(registrar.messenger(), CHANNEL); MyFlutterEventPlugin myFlutterEventPlugin = new MyFlutterEventPlugin(); eventChannel.setStreamHandler(myFlutterEventPlugin); return myFlutterEventPlugin; } @Override public void onListen(Object o, EventChannel.EventSink eventSink) { this.eventSink = eventSink; } @Override public void onCancel(Object o) { }}Flutter 代码
import 'package:flutter/material.dart';import 'package:flutter/services.dart';void main() => runApp(MyApp());class MyHomePageState extends State { static const myPlugin = const MethodChannel('com.example.flutter_app/plugin'); static const myEventPlugin = const EventChannel('com.example.flutter_app/event_plugin'); @override void initState() { super.initState(); myEventPlugin.receiveBroadcastStream().listen(_onEvent, onError: _onError); } void _onEvent(Object event) { print("onEvent: $event"); } void _onError(Object error) { print("onError: $error"); } void getUser() async { Map map = {"userId": 101}; String result = await myPlugin.invokeMethod("getUser", map); print(result); } @override Widget build(BuildContext context) { return new Center( child: new RaisedButton( onPressed: () { getUser(); }, child: new Text("调用原生"), ), ); }}class MyHomePage extends StatefulWidget { @override State createState() { return new MyHomePageState(); }}class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return new MaterialApp( title: 'Welcome to Flutter', home: new Scaffold( appBar: new AppBar( title: new Text('Welcome to Flutter'), ), body: MyHomePage(), ), ); }} 更多相关文章
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