How to navigate from Flutter Page to Native Android Page

Question

In this i am creating an app in which i successfully added the flutter module in existing android app by using these links https://flutter.dev/docs/development/add-to-app , https://flutter.dev/docs/development/add-to-app/android/add-flutter-screen . Here the launch screen is native android and then i added a button to navigate to flutter screen. But my question is how do i navigate from flutter screen to native android screen. Here is the code of native android and dart code. Note: I already added the flutter module dependencies in build.gradle and also added the code in settings.gradle, so i am not going to mention the code.

MainActivity.java

Button btn1;
        btn1=findViewById(R.id.button1);
        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(FlutterActivity.createDefaultIntent(v.getContext())); //this navigate to flutter page
            }
        });

Main.dart

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Demo'),),
      body: Container(
        child: Center(
          child: RaisedButton(
            onPressed: (){
              //Here how do i navigate to Native Android Screen ?
            },
            child: Text('Navigate to Android'),
          ),
        ),
      ),
    );
  }
}

Answer 1

In Flutter, you should invoke a method through Platform Channel to call a function to navigate from the activity/view controller which hosts your Flutter, you can't directly navigate to a native view from Flutter.

 // .dart file
 void _exitFlutter() {
    PlatformChannel.invokeMethod('navToNative');
 }

// .kt or .java file
MethodChannel(flutterEngine!!.getDartExecutor().getBinaryMessenger(), CHANNEL)
        .setMethodCallHandler { call, result ->
          run {
            when (call.method) {
              "navToNative" -> // start your activity here
              else -> result.notImplemented()
            }
          }
        }

You can check the detail here https://github.com/duytq94/demo-integrate-flutter