(This book includes the new features of Android 3/4, and the development cases of "settling down" practice, and introduces the basic concepts, practical technologies and use modes of Android platform development. The primary contents include the use of program framework, high-end interface, database use, network communication and Web development, wireless communication, multimedia use, personal information management, telephone system management, XML use, map use and system information management. This book selects 95 cases, mainly for developers with certain mobile platform development experience, and programmers who are interested in developing Android platform.)