Recently my friend Cristobal Viedma showed me a book called "Professional Android 2 Application development" written by Reto Meier. Fortunately I have met the author in the event organized by btwen near T-Centrale, in Stockholm.
The book in question is this:
Here you may find the first chapter where explain the introduction to the world of Android from the book:
I have started to read the book few days ago. It contains a lot of examples and codes which the reader can practice.
Reto Meier: Android best practices.