(This book is an amiable introduction to Android development, which is applicable to both developers and non developers. This paper introduces the building of the android development environment, understands the android SDK, and introduces Android introductory examples, including RSS readers, android based douban (Web2.0), online music players, and personal mobile maps based on Google Map. I don't need to talk about whether a book is good or bad. I don't know until I read it. This document includes the following annexes:)