列表视图上未更新微调器值

Question

我有一个微调器，让用户从xml中的一组字符串数组中选择一顿饭。用户选择项目后，我将选择放入数据库，并显示在Listview上。

在我的模型中，我有一个toString（），

@Override
public String toString() {

    return id + " " + note +"\n meal: " + this.meal;
}

在用于编辑膳食的控制器类中，我有这个，

    public class EditNoteFragment extends Fragment implements
    OnItemSelectedListener{

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_edit,
            container, false);

    // populating the spinner with string array of time category
    spinner = (Spinner) rootView.findViewById(R.id.spinner_meal_category);

    ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
            getActivity().getApplicationContext(), R.array.meal_array,
            android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(adapter);
    spinner.setOnItemSelectedListener(this);
   }

        @Override
    public void onItemSelected(AdapterView<?> parent, View view, int pos,
        long id) {
        meal = parent.getItemAtPosition(pos).toString();
        Log.i(LOGTAG, "Got the meal: " + meal);

}  


    public boolean onOptionsItemSelected(MenuItem item) {
    // I added the field variable meal into the datebase in this block of code
            //note.setMeal(meal.toString());
}

    }

我使用log验证我得到了用户选择并存储在字段变量＆＃34; meal＆＃34;在我的课堂上，但是当我运行应用程序并且列表显示为空时。

我确信我已成功将这顿饭添加到数据库中。

这是视图类

            public static class NoteFragment extends ListFragment {
    TextView tx_list_note;
    NoteDataSource datasource;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        datasource = new NotesDataSource(getActivity());
        datasource.open();

        List<Note> notes = datasource.findAll();
        if (notes.size() == 0) {
            createData();
            notes = datasource.findAll();           
                      }

        ArrayAdapter<Note> adapter = new ArrayAdapter<Note>(getActivity(),
                android.R.layout.simple_list_item_1, notes);
        setListAdapter(adapter);

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_notes,
                container, false);


        return rootView;
    }
}

}

在fragment_notes.xml中，我在相对布局中有一个listview

<ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_above="@+id/textView1"
    android:layout_alignParentLeft="true"
    >
  </ListView>

非常感谢你提前帮助。任何建议将不胜感激。