addObserver method
Implementation
@override
Future<void> addObserver(TUICallObserver observer) async {
_observerList.add(observer);
methodChannel.invokeMethod("addObserver", {});
}
@override
Future<void> addObserver(TUICallObserver observer) async {
_observerList.add(observer);
methodChannel.invokeMethod("addObserver", {});
}