Android：调用onCreateOptionsMenu，但未在片段中更新操作栏菜单

Question

I am using drawerlayout in activity with several fragments. By clicking the navigation item, I switch the fragment this way:

switch (index) {
            case 0:
                if (checkinFragment == null) {
                    checkinFragment = new CheckinFragment();
                    ft.add(R.id.main_container, checkinFragment, "0");
                } else {
                    ft.show(checkinFragment);
                }

                break;
            case 3:
                if (jianGuanFragment == null) {
                    jianGuanFragment = new JianGuanFragment();
                    ft.add(R.id.main_container, jianGuanFragment, "3");
                } else {
                    ft.show(jianGuanFragment);
                }

                break;
        }

        ft.commitAllowingStateLoss();

Each fragment has a different menu resource file inflated in its onCreateOptionsMenu(Menu menu, MenuInflater inflater) method.

Steps:
1. When first enter the activity the menu in checkinFragment is shown.(All right)
2. Then switch to the jianGuanFragment , the menu in jianGuanFragment is shown.(Also right)
3. However, when switch back to the first fragment( checkinFragment ), the actionbar menu isn't updated. The showing menu is still the one in jianGuanFragment . That's the problem.

And from the log I know the onCreateOptionsMenu in the showing fragment is called each time I switch to it. That's to say:

onCreateOptionsMenu is called but actionbar menu isn't updated.

Anyone can help me? Thanks a lot.

EDIT 1: add the code in onCreateOptionsMenu:
(1)in checkinFragment

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

        LogUtils.e("TAG", "CheckinFragment onCreateOptionsMenu");
        menu.clear();
        inflater.inflate(R.menu.menu_setting, menu);
    }

(2)in jianGuanFragment

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

        LogUtils.e("TAG", "JianGuanFragment onCreateOptionsMenu");
        menu.clear();
        inflater.inflate(R.menu.menu_jianguan, menu);
    }

EDIT 2: I use toolbar, not the old actionbar.

Answer 1

Use invalidateOptionsMenu() . You need to use it where call to OnCreateOptionsMenu() is required.

EDIT: getActivity().invalidateOptionsMenu() can be used if you want to call it from Fragment .

Hope that helps!!!

Answer 2

Try this 1)in checkinFragment

 @Override
    public void onPrepareOptionsMenu(Menu menu) {
        menu.clear();
        LogUtils.e("TAG", "CheckinFragment onCreateOptionsMenu");
        getActivity().getMenuInflater().inflate(R.menu.menu_setting, menu);
        super.onPrepareOptionsMenu(menu);
   }

Answer 3

At last I find the solution:

Each time entering a fragment, re-set the toolbar as ationbar again.

@Override
public void onHiddenChanged(boolean hidden) {
    super.onHiddenChanged(hidden);

    if (!hidden) {
        AppCompatActivity compatActivity = (AppCompatActivity) mActivity;
        mToolbar = (Toolbar) compatActivity.findViewById(toolbarId);
        compatActivity.setSupportActionBar(mToolbar);
    }
}