Flutter与Android原生界面交互

Flutter代码

class SendToApp extends StatefulWidget {

  @override
  State<StatefulWidget> createState() {
    return SendToAppState();
  }
}

class SendToAppState extends State<SendToApp> {
  //1.定义MethodChannel，参数要与原生app中MethodChannel的参数一致，可以任意写
  MethodChannel methodChannel = MethodChannel('song.test.com.myapplication');

  String result = "";

  void onClick() async {
    //3.调用原生方法，showToast传给原生app中MethodChannel方法,MethodCall根据这个值处理不同逻辑，result原生方法的返回值
    final String result = await methodChannel.invokeMethod('showToast');

    setState(() {
      this.result = result;
    });
  }

  //2.编写页面
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: Text("Flutter与原生界面交互"),
          ),
          body: Container(
            child: Center(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: <Widget>[
                    Text(result),
                    RaisedButton(
                      onPressed: onClick,
                      child: Text("点击"),
                    )
                  ],
                )
            ),
          )
      ),
    );
  }
}

Android原生代码

public class FlutterShowActivity extends AppCompatActivity {
    FlutterView flutterView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        String router = getIntent().getStringExtra("router");

        new Handler().postDelayed(new Runnable() {
            @Override
            public void run() {
//这个方法也太慢了
                flutterView = Flutter.createView(
                        FlutterShowActivity.this,
                        getLifecycle(),
//                        "route1"//路由信息，可以传递到flutter，判断显示什么组件，也可以传递一些简单的数据
                        router
                );

                setContentView(flutterView);


                //监听Flutter中的方法调用，song.test.com.myapplication跟Flutter中的参数一样
                new MethodChannel(flutterView, "song.test.com.myapplication").setMethodCallHandler(
                        new MethodChannel.MethodCallHandler() {
                            @Override
                            public void onMethodCall(MethodCall call, MethodChannel.Result result) {
                                if (call.method.equals("showToast")) {
                                    Toast.makeText(FlutterShowActivity.this, "Flutter让我弹出Toast", Toast.LENGTH_SHORT).show();
                                    result.success("APP回应Flutter已经弹过Toast了");
                                } else {
                                    result.notImplemented();
                                }
                            }
                        }
                );

            }
        }, 100);


    }
}