本书被广大Android 开发者誉为“Android学习第一书”。全书系统全面、循序渐进地介绍了Android软件开发的必备知识、经验和技巧。第2版基于Android 7.0对第1版进行了全面更新，将所有知识点都在最新的Android系统上进行重新适配，使用全新的Android Studio开发工具代替之前的Eclipse，并添加了对Material Design、运行时权限、Gradle、RecyclerView、百分比布局、OkHttp、Lambda表达式等全新知识点的详细讲解。(The book has been hailed by the majority of Android developers as "Android learning first book."". The book systematically introduces the necessary knowledge, experience and skills of Android software development in a systematic and step-by-step manner. The second edition of Android 7 on the first version based on a comprehensive update, all the points in the new Android system on re adaptation, using the new Android Studio development tools to replace the previous Eclipse, and added to Material Design, Gradle, RecyclerView, runtime permissions, layout, OkHttp, Lambda expression percentage new knowledge points to explain in detail.)