android wallet are light weight clients and don't download the whole block chain
if the download the complete blockchain then you will need to download 30GB blockchain data on your smartphone
and what about running wallet with that much data? i can't imagine
what i want is the source code for an entirely different purpose
Then please explain your purpose, so that we can point you in the right direction. I don't believe anyone has made a full-chain android wallet for Bitcoin, even older ones wouldn't exist for the simple reason that older Android phones also had much less storage capability so very few were even capable of holding the full-chain if it were possible.