This week's book giveaways are in the Refactoring and Agile forums. We're giving away four copies each of Re-engineering Legacy Software and Docker in Action and have the authors on-line! See this thread and this one for details.
A book covering 2.x (even 2.0) should serve you well for quite a while. Development is already slowing down, and many of today's devices will not run the upcoming version (2.3, or 3.0, or whatever). Even now, Android 1.5/1.6 have over a third of market share, so targeting 2.x with your app would leave many users behind.