Loader异步装载CursorLoader的案例

public class MainActivity extends Activity implements LoaderCallbacks<</span>Cursor>{
02 
03     private ListView lvinfo;
04     private TextView tvempty;
05     private SimpleCursorAdapter adapter;
06     private LoaderManager manager;
07     @Override
08     protected void onCreate(Bundle savedInstanceState) {
09         super.onCreate(savedInstanceState);
10         setContentView(R.layout.activity_main);
11         lvinfo =(ListView) findViewById(R.id.lv);
12         tvempty = (TextView) findViewById(R.id.tvnothing);
13         adapter = new SimpleCursorAdapter(this, R.layout.listview, null, new String[]{"_id","address","body"}, newint[]{R.id.tvid,R.id.tvadd,R.id.tvbody}, SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
14         lvinfo.setAdapter(adapter);
15         lvinfo.setEmptyView(tvempty);
16         
17         //异步去加载数据，
18         //获得LoaderManager的管理器
19         manager=getLoaderManager();
20         //初始化Loader
21         manager.initLoader(1, null, this);
22     }
23     //初始化方法，只执行一次
24     @Override
25     public Loader<</span>Cursor> onCreateLoader(int id, Bundle args) {
26         // 启动
27         return new CursorLoader(this, Uri.parse("content://sms"), null, null, null, null);
28     }
29     //回调的方法
30     @Override
31     public void onLoadFinished(Loader<</span>Cursor> loader, Cursor data) {
32         // 当异步加载数据得到数据后就需要刷新listview
33         adapter.swapCursor(data);
34     }
35     //当loader被重置时执行
36     @Override
37     public void onLoaderReset(Loader<</span>Cursor> loader) {
38         // TODO Auto-generated method stub
39         adapter.swapCursor(null);
40     }
41 
42 }