Android, the world’s most popular mobile platform | Android Developers

http://developer.android.com/about/index.html

Android, the world’s most popular mobile platform | Android Developers

Krishna Dathan

Galaxy S II Bible: Complete reference (updated 01/02/12)

A very useful tutorial cleanly depicting the basics of the android development.

http://forum.xda-developers.com/showthread.php?t=1473577