java - Fragment v4 中的 AsyncTask 不在 2.2 上调用 onPostExecute，而是在 2.3 上调用最新版本的 android

Question

我对 Fragment 有一个问题，它不会在 2.2 上调用 onPostExecute，而是在 2.3 上调用最新版本的 android。

我试图找到解决方案几天但没有找到。

我这个片段的代码

public class MovieFragment extends SherlockFragment implements IHomeScreen, OnItemClickListener, IActivity {

private FrameLayout      loading          = null;
private ListView         listView         = null;
private ListMovieAdapter listMovieAdapter = null;
private boolean          isFavorite       = false;
private boolean          isSearch         = false;
private String           strSearch        = null;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    return inflater.inflate(R.layout.fragment_movie, container, false);
}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    init(view);
    initObjectListener();
    super.onViewCreated(view, savedInstanceState);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    if (strSearch == null) {
        loadingDataFromLocal();
    }
    else {
        loadingDataFromServer(strSearch);
    }
    super.onActivityCreated(savedInstanceState);
}

@Override
public void init() {
}

@Override
public void initFormValidation() {
}

@Override
public void init(View v) {
    listView = (ListView) v.findViewById(R.id.listView);
    loading = (FrameLayout) v.findViewById(R.id.loading);
    loading.setVisibility(View.GONE);
}

@Override
public void initObjectListener() {
    listView.setOnItemClickListener(this);
}

@Override
public void loadingDataFromServer() {
}

public void loadingDataFromServer(String strSearch) {
    if (Utils.isOnline(getActivity())) {
        new LoadingDataFromServer().execute(strSearch);
    }
}

public void refreshList(List<EntryVO> entryVOs) {
    listMovieAdapter = new ListMovieAdapter(getSherlockActivity(), entryVOs, isFavorite);
    listView.setAdapter(listMovieAdapter);
}

@Override
public void loadingDataFromLocal() {
    Utils.log(new Exception(), "[isFavorite]" + isFavorite);
    if (isFavorite) {
        refreshList(DataSourceDAO.getFavorite(getSherlockActivity()));
        return;
    }
}

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
    if (Utils.isOnline(getActivity())) {
        String youtubeID = listMovieAdapter.getItem(position).getYoutubeID();
        Utils.log(new Exception(), "[position]" + position + "[youtubeID]" + youtubeID);
        new YoutubePlayer(getSherlockActivity(), youtubeID);
    }
    else {
        Toast.makeText(getActivity(), R.string.no_internet_connection, Toast.LENGTH_LONG).show();
    }
}

class LoadingDataFromServer extends AsyncTask<String, Void, List<EntryVO>> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Utils.log(new Exception(), "[onPreExecute]");
        if (isSearch) {
            Utils.showProgressDialog(R.string.searching, getSherlockActivity());
        }
    }

    @Override
    protected void onPostExecute(List<EntryVO> result) {
        super.onPostExecute(result);
        Utils.log(new Exception(), "[onPostExecute]");
        Utils.dismissProgressDialog();
        refreshList(result);
    }

    @Override
    protected List<EntryVO> doInBackground(String... params) {
        Utils.log(new Exception(), "[doInBackground]");
        String search = params[0];
        List<EntryVO> entryVOs = new SearchYoutubeAPI().searchYoutube(search);
        Utils.log(new Exception(), "[entryVOs]" + entryVOs.size());
        return entryVOs;
    }
}

}

但如果我测试它复制

class LoadingDataFromServer extends AsyncTask<String, Void, List<EntryVO>> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        Utils.log(new Exception(), "[onPreExecute]");
        if (isSearch) {
            Utils.showProgressDialog(R.string.searching, getSherlockActivity());
        }
    }

    @Override
    protected void onPostExecute(List<EntryVO> result) {
        super.onPostExecute(result);
        Utils.log(new Exception(), "[onPostExecute]");
        Utils.dismissProgressDialog();
        refreshList(result);
    }

    @Override
    protected List<EntryVO> doInBackground(String... params) {
        Utils.log(new Exception(), "[doInBackground]");
        String search = params[0];
        List<EntryVO> entryVOs = new SearchYoutubeAPI().searchYoutube(search);
        Utils.log(new Exception(), "[entryVOs]" + entryVOs.size());
        return entryVOs;
    }
}

要在 Activity 中运行，它也适用于 2.2。

你能告诉我我的代码有什么问题吗......

非常感谢，