Passing MotionEvents from RecyclerView.OnItemTouchListener to GestureDetectorCompat

Question

I have a Fragment that implemets RecyclerView.OnItemTouchListener. How do I pass click and long-click motion events only from the RecyclerView to the Gestur

Answer 1

You have to initialize GestureDetectorCompat in onCreateView() method:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.myfrag, container, false);

    detector = new GestureDetectorCompat(getActivity(), new RecyclerViewOnGestureListener());

    recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerview);

    layoutManager = new LinearLayoutManager(getActivity());
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.addOnItemTouchListener(this);

    adapter = new MyAdapter(myData));
    recyclerView.setAdapter(adapter);
    return rootView;
}

RecyclerViewOnGestureListener is your own inner class extending SimpleOnGestureListener (that provides empty implementation of OnGestureListener methods)

private class RecyclerViewOnGestureListener extends SimpleOnGestureListener {

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e) {
        View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
        int position = recyclerView.getChildPosition(view);

        // handle single tap

        return super.onSingleTapConfirmed(e);
    }

    public void onLongPress(MotionEvent e) {
        View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
        int position = recyclerView.getChildPosition(view);

        // handle long press

        super.onLongPress(e);
    }
}

Now look at line (from onCreateView() method):

recyclerView.addOnItemTouchListener(this);

In our case 'this' is OnItemTouchListener containing two methods we need to implement:

@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
    detector.onTouchEvent(e);
    return false;
}

@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}

Here is an explanation what these methods mean: https://developer.android.com/reference/android/support/v7/widget/RecyclerView.OnItemTouchListener.html

It's all you need to handle single tap and long press events from RecyclerView.

Answer 2

I might be late but for visual feedback add this to your list_item layout

android:background="@drawable/tranparent_selector"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true"

Also, onSingleTapUp can be used instead of onSingleTapConfirmed as tapping is usually fast. So if you tap fast to other items you wont get it working. For fast tapping I prefer onSingleTapUp