create method channel after upgrading flutter- can not resolve method getFlutterView()

Replace getFlutterView() with getFlutterEngine().getDartExecutor().getBinaryMessenger().

You don't actually need the .getBinaryMessenger() as DartExecutor implements BinaryMessenger itself (by just forwarding), but I think it's more correct to specify the messenger.

Simply add this method to your class:

BinaryMessenger getFlutterView(){
    return getFlutterEngine().getDartExecutor().getBinaryMessenger();
}

And then optionally replace all ( Refactor > Rename ) "getFlutterView" to "getBinaryMessenger" to have a more readable code:

BinaryMessenger getBinaryMessenger(){
    return getFlutterEngine().getDartExecutor().getBinaryMessenger();
}

Remove this import io.flutter.embedding.android.FlutterActivity;

Add this import io.flutter.app.FlutterActivity;

Worked for Me