when you click continuously (before the transition animation ends) on the next image it crashes

[hussam789]

 @Override
public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
        mIsSingleTap = event.getPointerCount() == 1;
        final int index = mSelectedCoverView.getNumber();
        if (mIsSingleTap) {
            mStartX = event.getX(0);
            int lowest,highest;

            try {

                lowest = mTouchedCovers.first();
                highest = mTouchedCovers.last();
            } catch (Exception e) {
                return true;
            }
                             .

mTouchedCovers.first() throws exception on this case, you have to ignore this touch and wait to the animation to finish so i returned true and exist the method