The Official Android Developers Site
iOS Dev Center at https://developer.apple.com/devcenter/ios/index.action.
Just like the iOS Dev Center, the official Android Developers site (http://developer.android.com/index.html)is the only place you need to go to get the Android SDK API syntax, rules, and definitions.
This site is also where you get the ADT tools, product updates, and official announcements. A lot of training materials and valuable guidelines can be found there as well.
For your convenience, this book includes some tables excerpted from the Android Developers site. They are referenced by topics that appear in Chapters 5 and 6. I find these tables helpful for understanding the topics. You can merely glance through ...