android - how to modifiy a list from ListFragment in its parent activity -

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i have sherlocklistfragment , i'm creating adapter inside onactivitycreated. parent activity implements callback interface communicating fragments. when method activity called want add / remove item fragment's list. have tried use getlistadapter , receive npe. if use getlistview, "content view not yet created" error received. how can modify list fragment in correct way?

activity code:

@override public void addfavorite(contact item) {     list<contact> favoritecontacts = ((favoritecontactsadapter) favouritecontactsfragment             .getlistadapter()).getcontacts();     favoritecontacts.add(0, item);     favoritecontactsadapter adapter = new favoritecontactsadapter(             getapplicationcontext(), r.layout.contact_layout,             favoritecontacts);     favouritecontactsfragment.setlistadapter(adapter); }

fragment code: 

@override public void onactivitycreated(bundle savedinstancestate) {     contacts = getarguments()             .getparcelablearraylist(constants.contacts_key);      adapter = new favoritecontactsadapter(getactivity(),             r.layout.contact_layout,             contactsutils.getfavoritecontacts(contacts));     setlistadapter(adapter);     ...


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