I have been developing small applications on android platform for last 4 months or so. What started as a hobby / plaything has become an important part of my day Job now! When I look back, I can see I have worked with almost all major components of android: Async work, Services, Wake locks, GPS, Alarm, REST etc.
And here is what I am trying to say “ITS REALLY EASY & FUN !!!”. Infact its so much fun that you wouldn’t even realize you have read 400 pages of books / 100s of articles without even knowing it! It is also one of my most favorite frameworks beside Spring where you get to see cool designs , great sample applications and lots of quality documentation.
Just grab the CommonsWare books and a 400$ android device(Optional, the emulator will do for the starters) and you are good to go!