android directory tree

I am a android beginner, now doing a show in a small program android file directory , you need to show up in a tree style , but I do not know how dynamic multi-level directory will be added to the ListView control , make friend with experience in the development ideas, grateful brother !
------ Solution ---------------------------------------- ----
I have this demo
------ reference ----------------------------- ----------
can be sent to me to see you, my mail : android927@163.com. Thank you very much ! ! !
------ reference --------------------------------------- < br> I now do with a tree structure to achieve android phone's file directory ( file manager ) , how to achieve the levels on your phone files and folders in a tree display ?
------ reference --------------------------------------- < br> also gave me a , 357861819@qq.com
------ reference --------------------------- ------------
can send one to me? kunchan@126.com
------ reference ----------------------------------- ----
resources can share what I also want to look at . . .
------ reference --------------------------------------- < br> Qiufa 987604356@qq.com
------ reference ----------------------------- ----------
Qiufa guxing_574842645@qq.com