(Prestige, any, practical and easy to understand are the greatest features of this book. This book is based on the Android training handout of BigNerdRanch Training Camp, which is famous in the United States. It has trained many professionals for Microsoft, Google, Facebook and other industry giants. The author magically integrated the miscellaneous knowledge, industry practice, programming standards, etc. required for Android development into a book, and thoroughly explained all aspects of Android development through carefully compiled use examples, step-by-step content arrangement, and step-by-step language. If you are still not satisfied after learning a chapter, the "challenge practice" will definitely make you cry out. The reason why this book can be exposed in mobile use development books is that it is really a "dialogue" with readers. Reading this book is like having a personal tutor around you to answer your questions at any time. This book is suitable for all readers interested in Android and mobile development, and requires a certain Java programming foundation.)