找出 ListView 是否滚动到底部? [英] Find out if ListView is scrolled to the bottom?

问题描述

我能否知道我的 ListView 是否滚动到底部?我的意思是最后一项是完全可见的.

Can I find out if my ListView is scrolled to the bottom? By that I mean that the last item is fully visible.

推荐答案

已编辑:

因为我一直在我的一个应用程序中研究这个特定主题，所以我可以为这个问题的未来读者写一个扩展的答案.

Since I have been investigating in this particular subject in one of my applications, I can write an extended answer for future readers of this question.

实现一个 OnScrollListener，设置你的 ListView 的 onScrollListener 然后你应该能够正确处理事情.

Implement an OnScrollListener, set your ListView's onScrollListener and then you should be able to handle things correctly.

例如:

private int preLast;
// Initialization stuff.
yourListView.setOnScrollListener(this);

// ... ... ...

@Override
public void onScroll(AbsListView lw, final int firstVisibleItem,
        final int visibleItemCount, final int totalItemCount)
{

    switch(lw.getId()) 
    {
        case R.id.your_list_id:     

            // Make your calculation stuff here. You have all your
            // needed info from the parameters of this function.

            // Sample calculation to determine if the last 
            // item is fully visible.
            final int lastItem = firstVisibleItem + visibleItemCount;

            if(lastItem == totalItemCount)
            {
                if(preLast!=lastItem)
                {
                    //to avoid multiple calls for last item
                    Log.d("Last", "Last");
                    preLast = lastItem;
                }
            }
    }
}

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