(This book covers most scenarios developed with Android, from basic introduction of Android, environment construction, SDK introduction, market use, to use analysis, component introduction, example demonstration, etc. In terms of technical implementation, it explains the complete comprehensive examples and source code analysis under five Android platforms, namely RSS reader, personal GPS based on Google Map, Douban (Web2.0) client, online music player and mobile information helper. This book pays attention to the guidance of practical ability. In compliance with the strictness of the technical development knowledge system, it provides detailed screenshots of the development situation in the links that simply produce errors and are difficult to understand, and presents important knowledge points and experience skills to the readers in a vivid way of "small experiments" and "small knowledge". In terms of the explanation of program examples, the examples are inserted in the essential knowledge chapter of Android development, which provides a good guide for beginners to combine learning with practice. This book is equipped with more than 300 minutes of engineering development video discs to guide readers to learn Android practical development technology quickly and without obstacles. This book is suitable for programmers with certain software development experience who want to quickly enter the field of Android development; A book for developers and Android development enthusiasts with some experience in mobile phone development; It is also suitable for Android training materials on relevant training campuses.)