Hi,
I just thought I would post this incase anyone is interested.
In August of last year I released a game on Google play and after its somewhat failed success I made it free-to-play and have now decided to release the source code which can be found here:
http://sourceforge.net/projects/dreadsarmy/
The game only made something like £15 overall which was about 5 months of work (a few months also working full-time for a games company). I suppose this is partly my fault for not capitalising on the micro-transactions approach most companies are taking nowadays (i.e Clash of Clans) and also for not having a marketing division but hey.
Just thought this might be useful to some people starting in Android mobile development, the code is very simple, the majority of work was the artwork which was done in Blender.
Cheers.