(It can be merged into a complete pdf file with adobe acrobat protocol------------------------------- Based on the previous version, this book has been improved comprehensively, and added knowledge about Android internals. It introduces threads, processes, long running services, broadcast receiver and alarm clock manager. This version also introduced more UI controls, and devoted more than 150 pages to Android 3.0, including fragments, fragment dialog boxes, ActionBar, and drag and drop. In addition, the book has greatly improved the relevant chapters on services and sensors, and revised the chapter on OpenGL to cover OpenGLES2.0 2.0 This book includes the comprehensive knowledge required by Android developers, which can not only lay a solid foundation for Android developers, but also improve their technology.)