android

Start with android development:

A good general starting point is always the wiki page: http://en.wikipedia.org/wiki/Android_(operating_system)

and the SDK http://developer.android.com/sdk/index.html

• this is a very good tutorial for developers that wish to have nice interfaces (android SDK required) http://blog.blprnt.com/blog/blprnt/processing-android-mobile-app-development-made-very-easy