Flutter与Android互通的常用方式实现与适用场景详解

// Flutter 侧（Dart）
const channel = MethodChannel('com.example/app');
Future<void> getNativeData() async {
  try {
    final String result = await channel.invokeMethod('getData');
    print('原生返回: $result');
  } on PlatformException catch (e) {
    print('调用失败: ${e.message}');
  }
}

// Android 侧（Kotlin）
class MainActivity : FlutterActivity() {
    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)
        MethodChannel(flutterEngine.dartExecutor.binaryMessenger, "com.example/app").setMethodCallHandler { call, result ->
            if (call.method == "getData") {
                result.success("Hello from Android!")
            } else {
                result.notImplemented()
            }
        }
    }
}

dependencies:
  url_launcher: ^6.0.0

import 'package:url_launcher/url_launcher.dart';
Future<void> launchURL() async {
  if (await canLaunch('https://flutter.dev')) {
    await launch('https://flutter.dev');
  }
}

// Flutter 侧
Widget build(BuildContext context) {
  return AndroidView(
    viewType: 'native_view',
    creationParams: {'text': 'Flutter传递的参数'},
    creationParamsCodec: StandardMessageCodec(),
  );
}

// Android 侧注册视图
class NativeViewFactory : PlatformViewFactory(StandardMessageCodec.INSTANCE) {
    override fun create(context: Context, id: Int, args: Any?): PlatformView {
        val params = args as Map<String, Any>
        return NativeView(context, params["text"] as String)
    }
}

// 在 FlutterActivity 中注册
flutterEngine.platformViewsController.registry.registerViewFactory(
    "native_view", NativeViewFactory()
)

// Flutter 侧
const channel = MethodChannel('com.example/activity');
Future<void> startNativeActivity() async {
  await channel.invokeMethod('startVideoPlayer', {'url': 'video.mp4'});
}

// Android 侧
MethodChannel(flutterEngine.dartExecutor, "com.example/activity").setMethodCallHandler { call, result ->
    if (call.method == "startVideoPlayer") {
        val url = call.argument<String>("url")
        val intent = Intent(this, VideoPlayerActivity::class.java).apply {
            putExtra("videoUrl", url)
        }
        startActivity(intent)
        result.success(null)
    }
}

// Flutter 侧
final prefs = await SharedPreferences.getInstance();
await prefs.setString('token', 'abc123');

// Android 侧读取（同一文件）
val prefs = getSharedPreferences("FlutterSharedPreferences", MODE_PRIVATE)
val token = prefs.getString("flutter.token", "") // 注意键名前缀 `flutter.`