如何填充一个ListView异步? [英] how to populate a listview asynchronously?
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问题描述
我想知道我应该怎么实施 ListAdapter
的异步加载其观点成的ListView
?我想这样做,因为我填充列表从我的数据库,它使我的行为有点慢加载的时间的信息。
I am wondering how I should implement a ListAdapter
that loads its views asynchronously into a ListView
? I want to do this because I am populating the list with information from my database, which is making my activity a bit slow to load at times.
推荐答案
您可以使用的 的AsyncTask
和使用的 onPostExecute
方法来发布新加载的结果:
You can use an AsyncTask
and use the onPostExecute
methods to publish the newly loaded results:
private ArrayAdapter adapter = new YourArrayAdapter();
private class YourAsyncTask extends AsyncTask<Void, Void, List<YourItem>> {
@Override
protected void onPreExecute() {
// start loading animation maybe?
adapter.clear(); // clear "old" entries (optional)
}
@Override
protected List<YourItem> doInBackground(Void... params) {
// everything in here gets executed in a separate thread
return DataBase.getItems();
}
@Override
protected void onPostExecute(List<YourItem> items) {
// stop the loading animation or something
adapter.addAll(items);
}
}
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