android – 如何检测Horizo​​ntalScrollView已到达终点

我希望当到达结束时,右键会改变颜色,当到达开始时,左键会改变颜色,所以,我想问一下如何检测Horizo​​ntalScrollView已经到了结尾.

解决方法

maxScrollX = horizontalscrollview.getChildAt(0).getMeasuredWidth()-horizontalscrollview.getMeasuredWidth(); 
    if (horizontalscrollview.getScrollX() == 0) { 
        lImageView.setimageResource(R.drawable.left_green); 
    } else { 
        lImageView.setimageResource(R.drawable.left); 
    }

    if (horizontalscrollview.getScrollX() == maxScrollX) { 
        rImageView.setimageResource(R.drawable.right_green); 
    } else { 
        rImageView.setimageResource(R.drawable.right); 
    }