switch (event.getAction()) {
    case MotionEvent.ACTION_MOVE:
        int moveX = (int) event.getRawX();
        if (moveX - downX >= 0 && Math.abs((int) event.getRawY() - downY) < mTouchSlop) {
            isSilding = true;
        }

        if (moveX - downX >= 0 && isSilding) {
            System.out.println("finals  " + (downX - moveX));
            mContentView.scrollTo(downX - moveX, 0);
        }else{
            mContentView.scrollTo(0, 0);
        }
        break;