Android：检测 ScrollView 何时触底 [重复]

Question

可能重复：
How to trigger an event when scrollView reach the bottom with Android?

我已经尝试了一个小时左右来检测我的 scrollView 何时到达屏幕底部。由于屏幕尺寸的不同，以及与Android无关的原因，我不能简单地说它的Y位置达到某个值时它在底部，但是我没有找到检测它何时处于底部的方法。

我确信有一个简单的解决方案，将视图的高度减去一些其他变量或其他东西，但由于某种原因，它只是不适合我。任何想法将不胜感激，谢谢。

Answer 1

试试这个：

@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) 
{
    // Grab the last child placed in the ScrollView, we need it to determinate the bottom position.
    View view = (View) getChildAt(getChildCount()-1);

    // Calculate the scrolldiff
    int diff = (view.getBottom()-(getHeight()+getScrollY()));

    // if diff is zero, then the bottom has been reached
    if( diff == 0 )
    {
        // notify that we have reached the bottom
        Log.d(ScrollTest.LOG_TAG, "MyScrollView: Bottom has been reached" );
    }

    super.onScrollChanged(l, t, oldl, oldt);
}

要实现这一点，请扩展 ScrollView，然后重写 onScrollChanged 方法（继承自 View）。

参考：Android: Understanding when ScrollView has reached the bottom