如何找出是否有的ListView滚动到最上面的位置？ [英] How to find out if ListView has scrolled to top Most position?

问题描述

我有一个ListView，第一它向下滚动，现在当我们向上滚动，它达到最顶端点。我想检测。就是有什么办法？我开发应用程序的API级别8.Pls帮助..

I have a ListView, first its scrolled down, now when we scroll up,it reach top most point. I want to detect that .Is there any way?I am developing application with api level 8.Pls help..

推荐答案

修改

见下面的意见，为什么，特别是在不同的API版本（尤其是后来者），这不是一个简单的方法，如果你列表的顶部（填充等）。但是，它给你一个开端低于API 14设备的解决方案：

See comments below as to why, especially on different API versions (esp later ones), this isn't a foolproof way to see if you're list is at the top (padding etc). However, it does give you a start for a solution on devices below API 14:

private boolean listIsAtTop()   {   
    if(listView.getChildCount() == 0) return true;
    return listView.getChildAt(0).getTop() == 0;
}

据我实施年前 - 这工作完全在当时

As far as my implementation years ago - this worked perfectly at the time.

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