如何检测该Horizo​​ntalScrollView已达到结束 [英] How to detect that the HorizontalScrollView has reached an end

问题描述

我想，当到达终点，右边的按钮会改变颜色，在到达的开始，左键会变色，所以，我想问问如何检测到Horizo​​ntalScrollView已经到头了。

解决方案

  maxScrollX = horizo​​ntalScrollView.getChildAt（0）.getMeasuredWidth（） -  horizo​​ntalScrollView.getMeasuredWidth（）;
    如果（horizo​​ntalScrollView.getScrollX（）== 0）{
        lImageView.setImageResource（R.drawable.left_green）;
    }其他{
        lImageView.setImageResource（R.drawable.left）;
    }    如果（horizo​​ntalScrollView.getScrollX（）== maxScrollX）{
        rImageView.setImageResource（R.drawable.right_green）;
    }其他{
        rImageView.setImageResource（R.drawable.right）;
    }
 

i want when reach to end ,the right button will change color ,when reach to the begin,the left button will change color ,so ,i want to ask how to detect that the HorizontalScrollView has reached an end.

解决方案

    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); 
    }

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