我正在使用FragmentActivity中的ListFragment与SimpleCursorAdapter和修改的CursorLoader.修改的CursorLoader只是发出rawQueries – 没有其他更改.
在FragmentActivity中的某个时刻,我需要重新获取ListFragment中的ListView的数据/游标.
我怎样才能做到这一点？
提前谢谢了.
这是FragmentActivity调用ListFragment中的一个方法：
public class ActivityList extends FragmentActivity {
@Override
protected void onActivityResult(final int requestCode,final int resultCode,final Intent intent) {
...
processUpdateList();
}
...
private void processUpdateList() {
Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragmentlist);
if (fragment != null) {
((FragmentList) fragment).requeryList();
}
}
}
这里是ListFragment,该方法应该启动ListView的重新查询,重新加载或重新绘制. ListView.invalidate()没有帮助 – 它没有更改显示的数据.
public class FragmentList extends ListFragment implements LoaderManager.LoaderCallbacks {
private SimpleCursorAdapter adapter;
private Context context;
private ListView listView;
public void requeryList() {
// listView.invalidate(); didn't re-query
// TODO: How???
}
@Override
public void onActivityCreated(final Bundle bundle) {
super.onActivityCreated(bundle);
context = getActivity().getApplicationContext();
listView = getListView();
getActivity().getSupportLoaderManager().initLoader(MyConstants.LDR_TABLE1LIST,null,this);
adapter = new SimpleCursorAdapter(context,R.layout.fragmentlist_row,new String[] { Table1.DESCRIPTION },new int[] { R.id.fragmentlist_row_description },CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
setListAdapter(adapter);
setListShown(false);
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
@Override
public Loader onCreateLoader(final int id,final Bundle bundle) {
MyCursorLoader loader = null;
switch (id) {
case MyConstants.LDR_TABLE1LIST:
loader = new MyCursorLoader(context,MysqLiteOpenHelper.TABLE1_FETCH,null);
break;
}
return loader;
}
@Override
public void onLoaderReset(final Loader loader) {
adapter.swapCursor(null);
}
@Override
public void onLoadFinished(final Loader loader,final Cursor cursor) {
adapter.swapCursor(cursor);
setListShown(true);
}
}