How to show only one child of expandable list at a time?

If you have "ExpandableListView" and show only one child of expandable Listview at a time, then below is the code for it.

 expendListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {  
       int previousGroup = -1;  
       @Override  
       public void onGroupExpand(int groupPosition) {  
         if(groupPosition != previousGroup)  
           expendListView.collapseGroup(previousGroup);  
         previousGroup = groupPosition;  
       }  
     });  

"groupPosition" will return the open group id. So when I expand the other group then open group will collapse.

You can also expand specific item of "ExpandableListView" by applying following code:

 expendListView.expandGroup(i);