I would like to know if it is possible to put an ExpandableListView as one child of one element of another ExpandableListView. Thanks
yes.It is possible to create the expandable listview inside the expandable listview.
Follow the bellow link.It demonstrates the 3_level expandable listview.
http://mylifewithandroid.blogspot.com/2011/02/3-level-expandable-lists.html