Question

我对AsyncTaskLoader有疑问。当应用程序启动时，它工作正常。然后我打电话给onRefreshStarted，而且一切都很好。但是，如果更改方向，AsyncTaskLoader开始处理loadInBackground，但永远不会调用onLoadFinished。有什么问题？

这是简化的SherlockFragment：

public class MyFragment extends SherlockFragment implements LoaderCallbacks<Object> {

    PullToRefreshLayout Rl;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        if (Rl == null) {
            Rl = (PullToRefreshLayout) inflater.inflate(
                R.layout.friends_fragment_rpc, null);
            getData();
        } else {
            ViewGroup parent = (ViewGroup) Rl.getParent();
            parent.removeView(Rl);
            getData();
        }
        setRetainInstance(true);
        return Rl;
    }

    private void getData() {
        loaderBndl = new Bundle();
        loaderBndl.putString(RequestLoader.ARGS_URL, url);

        getActivity().getLoaderManager().initLoader(LOADER_ID, loaderBndl, this)
                .forceLoad();
    }

    @Override
    public Loader<Object> onCreateLoader(int id, Bundle args) {
        Loader<Object> loader = null;
        if (id == LOADER_ID) {
            loader = new RequestLoader(getActivity(), args);
        }
        return loader;
    }

    @Override
    public void onLoadFinished(Loader<Object> loader, Object result) {
        Log.d(TAG, "onLoadFinished");
    }

    @Override
    public void onRefreshStarted(View view) {
        getData();
    }
}

和AsyncTaskLoader：

public class RequestLoader extends AsyncTaskLoader<Object> {
    public RequestLoader(Context context, Bundle args) {
        super(context);
        if (isDebug)
            Log.d(TAG, "create RequestLoader");
        ...
    }

    @Override
    public Object loadInBackground() {
        if (isDebug)
            Log.d(TAG, "loadInBackground");

        Object requestResult = null;
        ...
        return requestResult;
     }
}

Answer 1

问题解决了--Sherlock Fragment应该使用SupportLoaderManager。

AsyncTaskLoader不调用onLoadFinished

1 个答案: