Flutter混合开发-通信

public class MyFlutterActivity extends FragmentActivity {


    FlutterFragment flutterFragment;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my_flutter);
        
        initFlutterEngine();
        attachFlutterFragment();
    }


    String ENGINE_ID = "a";

    private FlutterEngine initFlutterEngine() {
        FlutterEngine flutterEngine = FlutterEngineCache.getInstance().get(ENGINE_ID);

        if (null == flutterEngine) {
            flutterEngine = new FlutterEngine(this);
            flutterEngine.getNavigationChannel().setInitialRoute("/");
            flutterEngine.getDartExecutor().executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault());
            FlutterEngineCache
                    .getInstance()
                    .put(ENGINE_ID, flutterEngine);
            messageChannelFunction(this,flutterEngine);
        }
        return flutterEngine;
    }

    private void attachFlutterFragment() {
        if (null == flutterFragment) {
            flutterFragment =
                    FlutterFragment.withCachedEngine(ENGINE_ID)
                            .shouldAttachEngineToActivity(true)
                            .build();
        }
        getSupportFragmentManager()
                .beginTransaction()
                .add(R.id.container, flutterFragment)
                .commit();
    }
}