说明：  本書分為三個部分。大致來說，這本書的過程就是從初級到更高級的主題，或從普遍到較少共同關於Android的方面。一些章節分享一般的例子：如一個Android數獨遊戲。逐步加入功能到遊戲，您將了解的許多方面Android編程，包括用戶間的介面，多媒體，以及Android的生命週期。
(Hello, Android is divided into three parts. Roughly speaking, the book progresses from less advanced to more advanced topics, or from more common to less common aspects of Android. Several chapters share a common example: an Android Sudoku game. By gradually adding features to the game, you’ll learn about many aspects of Android programming including user interfaces, multimedia, and the Android life cycle)