How do I use the bottomNavigationView variable outside of the MainActivity?
In MainActivity, I would use this to set and reove a badge
// To Add BadgeDrawable badge = bottomNavigationView.getOrCreateBadge(menuItemId); badge.setVisible(true); // To remove bottomNavigationView.removeBadge(menuItem.getItemId());
However it will return null in a fragment if I try the same method
public BottomNavigationView bottomNavigationView;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
MainActivity main = new MainActivity();
main.bottomNavigationView.removeBadge(2131231026);
I have also tried this in the fragment, but nothing occurs
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.fragment_chat, container, false);
final View nav = inflater.inflate(R.layout.activity_main, container, false);
bottomNavigationView = nav.findViewById(R.id.bottomNav);
BadgeDrawable badge = bottomNavigationView.getOrCreateBadge(2131231026);
badge.setVisible(false);
Answer
I don’t know if you have this in Java (requireActivity) and if you have only one Activity in your project, but It can be the solution :
(requireActivity() as MainActivity).findViewById(R.id.bottomNav)
Also you can add function in your main Activity like addBadge / removeBadge.
But I think you can’t get bottomNavigationView outside the main activity because it’s part of UI mainActivity and not others fragments PS : Your line ” MainActivity main = new MainActivity();” isn’t good because you instanciate an activity and not get actual instance so bottomNavigationView is null. May be use this.getActivity() ( this = fragment instance)