Android : Custom listview, custom expandablelistview with listview inside (item list is listview)

I want to create a list of friends with index 'A', 'B', 'C', and more ..(like a listview or expandablelistview)

With each item view, i want to add more friends with each character, ex: 'A' are : abert, abum,...

With each friend i want to add more phone number ( also like listview )

I have attached the pichture

I get difficult in doing this.

I hope experts can help me? or give me solutions.

Hope get your feedback soon,

[illustration picture: http://i62.tinypic.com/2ak9pvd.png]

Thank you so much