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

    @Override
    public void onGroupExpanded(int groupPosition) {
        super.onGroupExpanded(groupPosition);
        int len = getGroupCount();

        for (int i = 0; i < len; i++) {
            if (i != groupPosition) {
               expListView.collapseGroup(i);
            }
        }
    }