(This book is the original English version of Mastery with Android 4. As a classic work of Android development, it is very suitable for readers who are committed to developing smartphones and tablet apps using Android 4SDK technology. Compared with mastering Android 3, version 4 has made necessary updates to the greatly changed animation API, address book API and other changed APIs, and together set a new chapter to explain the asynctask API. About the author: Satya Komatineni: Master of Electronic Engineering, Indian University of Technology. With more than 20 years of programming experience, he has developed AspireWeb, a simple open source tool for Java Web development, and AspireKnowledge Central, an open source personal Web operating system. Good at using Java NET and database technology, and published more than 30 articles in this field. Dave MacLean: Bachelor of Systems Design Engineering, University of Waterloo, Canada. He has been engaged in software development since 1980, and has used multiple languages for programming. He has developed robot automation, data warehouse, Web self-service user program, EDI business manager and other systems. Dave has worked in Sun, IBM, Trimble Navigation, General Motors and other enterprises.)