Here is a little lesson on some issues with building a android wallet
Bitcoin wallet uses spv (simple payment verification)
      a. bitcoinj is a java implementation of this
     b. This allows multiple clients to Download header only files of the block chain.
Currently there is no implementation for pos coins to do this
a. The Blocks that are created threw pos and pow are different and this information is not stored in the block header.

              1. Not sure how this works now that mint is pure pos
            2. the app needs this information to work so this is a large bridge to cross
Hash engineering digitalcoin and digitalcoinj great repo to fork for wallet a. PROS
  1. He implements multiple variables into one class for easy porting of the code

     2. He has not implemented pos coins but he is very interested in the process.
b. Cons
  1. currently pow only
   2. Alot of coding required the cpp to be rewritten in java
I have been combing threw cpp code of mint coin and let me tell you the main.cpp between mint coin and bit coin for pos vs pow coin is very different. This will be a lot of work or maybe very easy work for smart person.
My Views:
Yes there is a nice bounty on wallet but I think we need a small development team I am willing to be a part of. Bounty will be split If the team completes app.
Set up a donation address There are plenty of people who would donate mint to make this happen. It would be a nice incentive for developers to know there getting payed a little bit for work they do. If people donate and developers are contributing they should be tipped as there going along. This will allow more motivation and stronger community support.