How can I change option menu in different fragment

问题:

I have a Fragment with menu:

public class FragmentA extends Fragment {

    public FragmentA() {
        setHasOptionsMenu(true);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        setHasOptionsMenu(true);
    }

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

I would like to change menu but it doesn't work and keep the old action menu

Fragment B is equals like above with different inflate XML menu.

public class FragmentB extends Fragment {

    public FragmentB() {
        setHasOptionsMenu(true);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        setHasOptionsMenu(true);
    }

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

EDITED:

Can be useful to use different menu layout for different fragments and 1 menu layout for main activity and differents id

回答1:

Put setHasOptionsMenu(true) in constructor and inflate fragment specific menu.

public class FragmentA extends Fragment {

    public FragmentA() {
       setHasOptionsMenu(true);
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ...
        setHasOptionsMenu(true);
    }

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

menu in main activity

public class MainActivity extends Activity {
    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.main_menu, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }
}

回答2:

Can all be done via Fragment - no need to inflate menu from activity:

public class UpdateFragment extends Fragment  {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // ...
        setHasOptionsMenu(true);
    }

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

        inflater.inflate(R.menu.update_menu, menu);
        super.onCreateOptionsMenu(menu, inflater);
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id){
            case R.id.navUpdateProfile:
                showToast("navUpdateProfile");
                return true;

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