Question

I have Activity with ViewPager that contains several Fragments. I am also using drop-down navigation in actionbar

actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

To this navigation bar I have some callbacks:

actionBar.setListNavigationCallbacks(mSpinnerAdapter, mNavigationCallback);

My problem is that changing option in navigation list should affect all Fragments inside ViewPager.

How should I do it to be compliant with good OO principles?

Answer 1

I would have your fragments implement an interface like this:

public Interface NavigationListener {
    public void onNavigationChanged(args...)
}

And then just call that method on each fragment in mNavigationCallback.