ExpandableLists in Android, I want to allow only one parent list to expand at a time

Question

I want to make only one item in the parent list expand at a time, my code for the onCreate is currently the following. (It works as I want, But the method to allow only one pare

Answer 1

Modified the answer from Iram: So you can reopen the same Group

// Listview Group expanded listener
    expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

        @Override
        public void onGroupExpand(int groupPosition) {
            if (prevouriousExpandedGroupNumber != -1 && prevouriousExpandedGroupNumber != groupPosition) {
                expListView.collapseGroup(prevouriousExpandedGroupNumber);
            }
            prevouriousExpandedGroupNumber = groupPosition;
        }
    });