flutterView

flutterView.java

View flutterView = Flutter.createView(
                MainActivity.this,
                getLifecycle(),
                "splashRoute"
        );

FrameLayout.LayoutParams frameLayout =
        new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        );

addContentView(flutterView, frameLayout);