public void refresh() {
   if (groupListView != null && groupAdapter != null) {
     grouplist = EMGroupManager.getInstance().getAllGroups();
     groupAdapter = new GroupAdapter(GroupsActivity.this, 1, grouplist);
     groupListView.setAdapter(groupAdapter);
     groupAdapter.notifyDataSetChanged();
   }
 }
 @Override
 public void onResume() {
   super.onResume();
   grouplist = EMGroupManager.getInstance().getAllGroups();
   groupAdapter = new GroupAdapter(this, 1, grouplist);
   groupListView.setAdapter(groupAdapter);
   groupAdapter.notifyDataSetChanged();
 }