I have found the selection of mobile Latin apps rather sparse. But, if you have internet access on a mobile device, perhaps these exercises would be useful for you:
http://web.uvic.ca/hrd/latin/wheelock/index.htm
Nice site Decimvs. IMHO the exercises shown there may turn out too difficult for someone who never had any experience with latin.
As said before, I put little trust in efficiency of such sources in learning vocabulary or even simpliest phrases. The only reasonable soultion IMO is to acquire an e-studybook with audio companion adjusted in apropriate format best suited for adroid environment phone.
Rosetta Stone Ltd released mobile aplications of their original learning software, however as far as I know Mobile app of Rosetta Stone Latin has not yet been released.
Being a "very satisfied" owner of Rosetta Stone Latin course, I sincerely advise to be very careful in purchaising it even in Windows 7/Mac OS version (but this is just my subjective opinion)
Anyway, here is a link to their site with all their product range :
http://www.rosettastone.co.uk/learn-latin