Android multilevel treeview
A quick and dirty port of http://androidcodesnips.blogspot.al/2011/09/three-level-expandable-list.html
No idea of the licence for the original, but this has been released under the DILLIGAF licence. No suitability, guarantee, or even ability to not completely destroy both your phone, computer and any near-by light bulbs are given. If you use it, and it does all of these things, well, DILLIGAF.
:)