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

Iram Bukhari's answer is working fine. but i have did once change:

private static int prev = -1;
// and OnGroupExpandListener implement


 mExpandableList.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {

                if(prev!=-1 && prev!=groupPosition )
                {

                    mExpandableList.collapseGroup(prev);    

                }
                prev=groupPosition;
            }
        });

I have added prev!=groupPosition as extra condition. Because if

item 1 has clicked(opened) 
item 1 has clicked(closed) 
item 1 has clicked(Not opening. because prev has same position so the item is opened and collapsed immediatly ) 

After Adding the condition

item 1 has clicked(opened) 
item 1 has clicked(closed) 
item 1 has clicked(opened)