android - Fragment 的菜单在屏幕旋转时将自身多板化

Question

我有一个 fragment ，它有一个包含一个项目的菜单。问题是在每次屏幕方向更改时，此项目都会加倍。所以第一次屏幕更改后有 2 个(相同的)项目，第二次更改后有 3 个项目，依此类推...

public class ManageLinksFragment extends Fragment {



FragmentManager fragmentManager;
FragmentTransaction fragmentTransaction;



DBHttpLinks db;
long itemPosition;
SimpleCursorAdapter adapter;
ListView lv;
Listener mListener;



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

    setRetainInstance(true);
    setHasOptionsMenu(true);

    // Inflate the layout for this fragment
    View v = inflater.inflate(R.layout.chooseonelinkfragment, container, false);

    lv = (ListView) v.findViewById(R.id.listView1);



    return v;
}




@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.menu_links, menu);
    super.onCreateOptionsMenu(menu,inflater);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {
        case R.id.addlinks:

            fragmentManager = getFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();

            // AddNewRecordFragment is a class name!
            AddHttpLinksFragment fragment2 = new AddHttpLinksFragment();
            fragmentTransaction.replace(R.id.fragment_left, fragment2, "addlinksF");
            fragmentTransaction.addToBackStack("chooselinksF");
            fragmentTransaction.commit();

            return true;


        default:
            return super.onOptionsItemSelected(item);
    }
}



@Override
public void onCreateContextMenu(ContextMenu menu, View v,
                                ContextMenu.ContextMenuInfo menuInfo) {
    super.onCreateContextMenu(menu, v, menuInfo);
    MenuInflater inflater = getActivity().getMenuInflater();
    inflater.inflate(R.menu.context_menu_manage_links, menu);
}

}

Answer 1

尝试移动:

setHasOptionsMenu(true);
setRetainInstance(true);

到你的 fragment onCreate,

另外，请确保您没有在 Activity.onCreate 中添加您的 fragment ，即使它已经存在。