Android: How to recreate Action bar when fragment changed

Question

I have an activity showing a few fragments. Activity view contains only ViewPager initialized with custom FragmentPagerAdapter. This adapter provide navigation among 3 fragments

Answer 1

You can ask android to re-create the actionbar before it automatically does by calling invalidateOptionsMenu();

Do this somewhere close to the point where you change fragments to try and decrease the 'lag' between the fragment and actionbar changing.

Edit

a complete solution may look like this:

class activity extends Activity{

private void switchFragment(){

...do fragment changing stuff

activity.invalidateOptionsMenu();

}

}

class someFragment extends Fragment{

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


    //fragment specific menu creation
}

}

whichever fragment is open during the

activity.invalidateOptionsMenu();

will then call its

 onCreateOptionsMenu

and you can do fragment specific menu creation in there