How to show changes in a common ExpandableListAdapter used in two fragments(Uses different arraylists)?

I am using two different fragments. First is for mainList and second one is for favoriteList. Both list use same ExpandableListView and same adapter but different arraylists of custom model class. Data of Arraylists is coming from database. When I click an ImageButton(Favorite) in mainList then instant changes in favoriteList are not happening. Changes are visible when I again load the whole application. notifyDataSetChanged() only changes the background image of ImageButton.

Thanks in anticipation.