public static class FavoritesList extends GalleryList {

    public static FavoritesList newInstance(int page) {
        FavoritesList list = new FavoritesList();

        Bundle args = new Bundle();
        args.putInt("page",page);
        list.setArguments(args);

        return list;
    }

    @Override
    public void onCreate(Bundle saveInstanceState) {
        super.onCreate(saveInstanceState);

        Cursor cursor = dbHelper.getGalleries(fav,preferences.getString("sort"+fav,"date desc"));
        listAdapter = new GalleryListAdapter(activity,cursor);
        setListAdapter(listAdapter);
    }

    ...

    @Override
    public void onCreateOptionsMenu(Menu menu,MenuInflater inflater) {
        super.onCreateOptionsMenu(menu,inflater);
        menu.add(Menu.NONE,8,"Remove All");
    }

    @Override
    public void onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);

        //listAdapter is null the first time this is called...

        if (listAdapter != null && listlistAdapter.getCount() == 0) {
            menu.findItem(R.id.filter).setEnabled(false);
            menu.findItem(0).setEnabled(false);
        }
        else {
            menu.findItem(R.id.filter).setEnabled(true);
            menu.findItem(0).setEnabled(true);
        }
    }
}

这是问题：onPrepareOptionsMenu在加载此片段之前在onCreate(我初始化listAdapter)之前调用,并且在第一次显示选项菜单之前不再调用它！

当声明onPrepareOptionsMenu时,Fragment documentation在菜单显示之前被调用,每次显示时都是错误的.

附：我正在使用Android支持库(v4).有任何想法吗？