@Override
 public void onPayClicked(int position) {
   PeopleDatabase database = new PeopleDatabase(getContext());
   database.open();
   int id = (int) adapter.getItemId(position);
   database.makePersonPay(id, mGroup.getId());
   mGroup.setPeople(database.getPeopleForGroup(mGroup.getId()));
   database.close();
   adapter.notifyDataSetChanged();
 }