使用光标时清空ListView

Question

我正在尝试在我的片段中填充ListView，但即使Cursor不是空的，因为我发现使用了log cat，ListView仍然是空的。我尝试过使用光标加载器，但没有帮助。光标是从内容提供者加载的。这是我的代码：

public class WisdomProverbsNormalFragment extends SherlockListFragment
    implements ShowcaseView.OnShowcaseEventListener {
Context mContext;

int i;

String TAG = "#Wisdom";
boolean showAds = true;

ShowcaseView sv;
AdView adView;

static final String KEY_ITEM = "tweet";
static final String KEY_PROVERB = "proverb";

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    setHasOptionsMenu(true);

    View rootView = inflater.inflate(R.layout.activity_hastag_wisdom,
            container, false);

    mContext = getSherlockActivity();


    if (haveNetworkConnection() != true) {
        // Ask for internet connection
        Context context = getActivity();
        LayoutInflater inflaterToast = getActivity().getLayoutInflater();

        View toastRoot = inflaterToast.inflate(
                R.layout.toast_layout_connection, null);

        Toast toast = new Toast(context);

        toast.setView(toastRoot);

        toast.setGravity(Gravity.BOTTOM, 0, 0);
        toast.setDuration(Toast.LENGTH_LONG);
        toast.show();
    } else {
        // Has connection; start service
    getSherlockActivity().startService(
                new Intent(mContext, GetTweetsService.class));
    }

    fillData();
    return rootView;
}

public void fillData() {
    Log.d(TAG, "Filling");
    String[] projection = { WisdomDB.ID, WisdomDB.PROVERB_TITLE };
    Cursor proverbs = getSherlockActivity().managedQuery(
            ProverbProvider.CONTENT_URI, projection, null, null, null); 

    String[] from = new String[] { WisdomDB.PROVERB_TITLE };
    int[] to = new int[] { R.id.textView1 };

    // Now create a simple cursor adapter and set it to display
    SimpleCursorAdapter dbAdapter = new SimpleCursorAdapter(mContext,
            R.layout.row, proverbs, from, to);

    setListAdapter(dbAdapter);

    Log.d(TAG, String.valueOf(dbAdapter.getCount()));

}

@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    Log.d("TAG", "onViewCreated");
    fillData();
}
  }