How can I refresh the ActionBar when onPrepareOptionsMenu switched menu entries?

Question

Within my apps I often enable/disable menu entries and do make them visible from onPrepareOptionsMenu.

Today I started to add the android:showAsAction menu attribute

Answer 1

Also make sure you are not calling

myAppCompatActivity.setToolbarTitle("some dynamic title");

shortly after you have refreshed your menu.

I had the issue that the drawables would not show up even if there was room for them to be displayed. Once I did an orientation change the drawables then appeared.. ?

In Summary:

MainActivity:

public class MainActivity extends AppCompatActivity {

    private boolean showMenu = true;

    public void setShowMenu(boolean show) {
        showMenu = show;
        supportInvalidateOptionsMenu();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.my_menu, menu);
        menu.findItem(R.id.menu_share).setVisible(showMenu);
        // menu.findItem(...
        return true;
    }
}

FragmentNoMenu:

public abstract class FragmentNoMenu extends Fragment {

    protected MainActivity mainActivity;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
        mainActivity = (MainActivity) getActivity();
        if (mainActivity != null) {
            mainActivity.setShowMenu(false);
        }
    }

}

FragmentWithMenu:

public abstract class FragmentWithMenu extends Fragment {

    protected MainActivity mainActivity;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);
        mainActivity = (MainActivity) getActivity();
        if (mainActivity != null) {
            mainActivity.setShowMenu(true);
        }
    }

}