@Override public boolean onTouchEvent(MotionEvent event) { if (!isEnabled()) { return false; } int actionMasked = MotionEventCompat.getActionMasked(event); switch (actionMasked) { case MotionEvent.ACTION_DOWN: mDownX = event.getX(); startDragging(event, isInScrollingContainer()); break; case MotionEvent.ACTION_MOVE: if (isDragging()) { updateDragging(event); } else { final float x = event.getX(); if (Math.abs(x - mDownX) > mTouchSlop) { startDragging(event, false); } } break; case MotionEvent.ACTION_UP: case MotionEvent.ACTION_CANCEL: stopDragging(); break; } return true; }