android listview - onfling inconsistent

Question

Based on the code from Android: How to handle right to left swipe gestures, I've created the following GestureDetector for my ListView in order to handle swipes.

    public ListEntryViewHolder(View view) {
        ButterKnife.bind(this, view);
        mGestureDetector = new GestureDetector(view.getContext(), new ListSwipeListener(view));
    }

    @OnTouch(R.id.rl_list_entry)
    boolean ListTouch(View ListEntry, MotionEvent event) {
        mGestureDetector.onTouchEvent(event);
        return false;
    }

The abstract GestureDetector looks like

public abstract class LeftRightSwipeListener extends SimpleOnGestureListener {

    private static final int SWIPE_DISTANCE_THRESHOLD = 5;
    private static final int SWIPE_VELOCITY_THRESHOLD = 5;

    @Override
    public boolean onDown(MotionEvent e) {
        return true;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        // Print Statement
        // Swipe Based Code that does some math and calls onSwipeRight() and onSwipeLeft()
    }

    public abstract void onSwipeRight();
    public abstract void onSwipeLeft();
}

Using the print statement within OnFling, I've found that onFling is being called in a very inconsistent manner; only about half of my swipes trigger the function to be called. If and when the function is called, it's able to distinguish between onSwipeRight() and onSwipeLeft() just fine. Disabling long clicks seemed to help a little, but it's unclear why onFling only triggers from time to time, perhaps the MotionEvents are getting consumed somewhere?

android listview - onfling inconsistent

0 Answers0