(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 attaches importance to the guidance of practical ability. In compliance with the strictness of the technical development knowledge system, it provides detailed screenshots of development scenarios in the links that are simple to generate errors and difficult to understand, and presents important knowledge points and experience skills to readers in a lively way of "small experiments" and "small knowledge". In the explanation of program examples, the examples are inserted in the essence knowledge chapter of Android development, which provides a good guide for beginners to combine learning with practice.)