对ListView进行优化，加载大数据量或者包含图片信息的时候滚屏加载

最新推荐文章于 2021-05-26 06:08:46 发布

休止符O

最新推荐文章于 2021-05-26 06:08:46 发布

阅读量2.6k

点赞数

CC 4.0 BY-SA版权

分类专栏： android开发文章标签： listview 优化 scroll callback list api

本文链接：https://blog.youkuaiyun.com/Jimmy5z/article/details/7799390

android开发专栏收录该内容

27 篇文章

订阅专栏

本文详细介绍了如何通过重写OnScrollListener的onScroll和onScrollStateChanged方法来实现滚动加载，有效解决ListView在大量数据时加载时间过长导致的卡屏问题。通过设置适配器的计数和调用notifyDataSetChanged方法，可以实现按需加载数据，提高用户体验。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

在做ListView加载数据时如果数据量大的话会造成加载时间过长而卡屏，所以为了解决这个问题，查看了SDK，

在OnScrollListener中有两个方法

只要重写这两个方法就可以实现滚动加载，例如：

public void onScroll(AbsListView v, int firstVisibleItem,
   int visibleItemCount, int totalItemCount) {
lastItem = firstVisibleItem + visibleItemCount - 1;
if (adapter.count == lastItem) {
   adapter.count += 10;
   adapter.notifyDataSetChanged();
}

}

public void onScrollStateChanged(AbsListView view, int scrollState) {
// TODO Auto-generated method stub

Log.i("onScrollStateChanged", "onScrollStateChanged");
}

public abstract void onScroll (AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)

Since: API Level 1

Callback method to be invoked when the list or grid has been scrolled. This will be called after the scroll has completed

Parameters

view	The view whose scroll state is being reported
firstVisibleItem	the index of the first visible cell (ignore if visibleItemCount == 0)
visibleItemCount	the number of visible cells
totalItemCount	the number of items in the list adaptor

public abstract void onScrollStateChanged (AbsListView view, int scrollState)

Since: API Level 1

Callback method to be invoked while the list view or grid view is being scrolled. If the view is being scrolled, this method will be called before the next frame of the scroll is rendered. In particular, it will be called before any calls togetView(int, View, ViewGroup).

Parameters

view	The view whose scroll state is being reported
scrollState	The current scroll state. One of `SCROLL_STATE_IDLE`, `SCROLL_STATE_TOUCH_SCROLL` or`SCROLL_STATE_IDLE`.