Android : how to get ExpandableListView child text

i am using expandable listview with json array. i have get sample code

 http://stackoverflow.com/questions/18269261/how-to-make-expandablelistview-with-json-array/18271181#18271181

my question is how to get child title as string. I need child data while click childlist.

 expListView.setOnChildClickListener(new OnChildClickListener() {

    @Override
    public boolean onChildClick(ExpandableListView parent, View v,
            int groupPosition, int childPosition, long id) {


  GlobalData.childheader=ListChildXXXXXXXXX.get(
                 Listparent.get(groupPosition)).get(
                         childPosition);

} It not executed. please help