Android - CommonGestures, implementacja we Fragmencie.

Question

Cześć, 

próbuje zaimplementować wykrywanie tzw. Common Gestures w mojej aplikacji, miejsce wykrywania to Fragment z ViewModelem.
Zaimplementowałem wszystkie niezbędne metody, onDown, onShowPress etc. GestureDetector  zostal zainicjalizowany w onCreateView. 

Kiedy użytkownik wykona jeden z "powszechnych" gestów, aplikacja powinna wywołać metodę umieszczoną w ViewModelu. 

Problem jest z nadpisaniem metody onTouchEvent. Android Studio wysyła błąd, w którym mówi, że moja implementacja nie nadpisuje żadnej metody.

public class SecondFragment extends Fragment  implements GestureDetector.OnGestureListener{

private SecondViewModel mViewModel;
private GestureDetectorCompat gDetector;
private final float rate = 3.14f;



public static SecondFragment newInstance() {
    return new SecondFragment();
}

@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
                         @Nullable Bundle savedInstanceState) {
    gDetector = new GestureDetectorCompat(getActivity(), this);
    return inflater.inflate(R.layout.second_fragment, container, false);
}


@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    mViewModel = new ViewModelProvider(this).get(SecondViewModel.class);




    TextView euroView = getView().findViewById(R.id.inEuro);
    TextView valueView = getView().findViewById(R.id.textView);
    Switch mSwitch = getView().findViewById(R.id.mySwitch);


    mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
            if (isChecked) {
                Navigation.findNavController(mSwitch).navigate(R.id.moveToMain);
            }
        }
    });

    final Observer<Float> valueObserver = new Observer<Float>() {
        @Override
        public void onChanged(@Nullable final Float myValue) {
            valueView.setText(myValue.toString());
        }
    };

    final Observer<Float> euroValueObserver = new Observer<Float>() {
        @Override
        public void onChanged(Float myValue) {
            euroView.setText(myValue.toString());
        }
    };

    mViewModel.getValue().observe(getViewLifecycleOwner(), valueObserver);
    mViewModel.getEuroV().observe(getViewLifecycleOwner(), euroValueObserver);
}


@Override
public void onStart(){
    super.onStart();
        mViewModel.setValue(SecondFragmentArgs.fromBundle(getArguments()).getVal());
}

@Override
public boolean onDown(MotionEvent motionEvent) {

   mViewModel.convertion();

    return false;
}

@Override
public void onShowPress(MotionEvent motionEvent) {

}

@Override
public boolean onSingleTapUp(MotionEvent motionEvent) {
    mViewModel.convertion();
    return false;
}

@Override
public boolean onScroll(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {
    mViewModel.convertion();
    return false;
}

@Override
public void onLongPress(MotionEvent motionEvent) {

}

@Override
public boolean onFling(MotionEvent motionEvent, MotionEvent motionEvent1, float v, float v1) {
    mViewModel.convertion();
    return false;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
    this.gDetector.onTouchEvent(event);
    return getActivity().onTouchEvent(event);
}