(Proficient in Android 3 has made comprehensive improvements on the basis of the previous version, added knowledge about Android internals, and introduced threads, processes, long running services, broadcast receiving programs, and alarm clock managers. 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, Proficient in Android 3 has greatly improved the relevant chapters on services and sensors, and revised the chapter on OpenGL to cover OpenGLES 2.0. Proficient in Android 3 includes all the knowledge required by Android developers, which can not only lay a solid foundation for Android developers, but also improve their technology. 89M high-definition PDF, uploaded in three volumes. Please decompress the first volume after downloading. The high-quality Android development book produced by Apress is worth having! This document includes the following annexes:)