android – 使用CursorLoader在填充列表视图之前显示进度指示器

我找到了一些使用assynctask的方法,但在我的例子中,我使用的是Loader / CursorLoader.

public class TestActivity extends SherlockFragmentActivity implements
    LoaderCallbacks<Cursor> {

SimpleCursorAdapter mAdapter;
ListView mListView;

private static final String[] UI_BINDING_FROM = new String[] {
        TestDBAdapter.KEY_NAME,TestDBAdapter.KEY_ICON };

private static final int[] UI_BINDING_TO = new int[] { R.id.text,R.id.icon };

@Override
public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_Test);

    mListView = (ListView) findViewById(R.id.listview);

    mAdapter = new TestAdapter(getApplicationContext(),R.layout.list_item_Test,null,UI_BINDING_FROM,UI_BINDING_TO,0);

    mListView.setAdapter(mAdapter);

    getSupportLoaderManager().initLoader(0,this);

}

@Override
public Loader<Cursor> onCreateLoader(int id,Bundle args) {


    Uri uri = ContentProviderTest.CONTENT_URI;

    CursorLoader cursorLoader = new CursorLoader(
            this,uri,null);

    return cursorLoader;

}

@Override
public void onLoadFinished(Loader<Cursor> loader,Cursor data) {
    mAdapter.swapCursor(data);
}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
    mAdapter.swapCursor(null);
}
}

一个可能的解决方案是创建一个扩展ListFragment的新类并使用setListShown()方法,但我不知道它是否是解决此问题的最佳方法.

谢谢