@Override
    public boolean onSingleTapUp(MotionEvent ev) {
        if (mRemoveEnabled && mRemoveMode == CLICK_REMOVE) {
            if (mClickRemoveHitPos != MISS) {
                mDslv.removeItem(mClickRemoveHitPos - mDslv.getHeaderViewsCount());
            }
        }
        return true;
    }
Checks for the touch of an item's drag handle (specified by
{@link #setDragHandleId(int)}), and returns that item's position
if a drag handle touch was detected.

@param ev The ACTION_DOWN MotionEvent.
@return The list position of the item whose drag handle was
touched; MISS if unsuccessful.
third_party/DragSortListView/src/com/mobeta/android/dslv/DragSortController.java