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This book is a hands-on guide to building mobile applications using version 2 of the Android software development kit. Chapter by chapter, it takes you through a series of sample projects, each introducing new features and techniques to get the most out of Android. It covers all the basic functionality as well as exploring the advanced features through concise and useful examples.
本书是一本指导如何用Android 2 SDK来构建移动应用的书籍。以逐章的方式，通过一系列示例项目，逐个将Android的新特性和技术介绍给读者。本书的内容覆盖了所有基本功能并通过简明实用的例子浏览了高级特性。

Google’s philosophy is to release early and iterate often. Since Android’s first full release in October 2008, there have been seven platform and SDK releases. With such a rapid release cycle, there are likely to be regular changes and improvements to the software and development libraries. While the Android engineering team has worked hard to ensure backwards compatibility , future releases are likely to date some of the information provided in this book.
谷歌的哲理是尽早发布和经常迭代。由此Android的第一个完整发布版是在2008年10月，已有7个平台和SDK发布版。如此快的发布周期，代表这定期的修改、改进Android和开发库。当Android工程团队的工作已很难保证向后兼容性，未来的版本发布日期很可能是在本书提供的一些信息中。

Nonetheless , the explanations and examples included here will give you the grounding and knowledge needed to write compelling mobile applications using the current SDK, along with the flexibility to quickly adapt to future enhancements.
尽管如此，本书包含的解释和例子将给你使用当前SDK开发处引人注目的移动应用以及能灵活快速使用未来Android版本的基础的知识。
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WHOM THIS BOOK IS FOR
This book is for anyone interested in creating applications for the Android mobile phone platform
using the SDK. It includes information that will be valuable, whether you’re an experienced mobile developer or you’re making your first foray , via Android, into writing mobile applications.
本书适合任何对使用Android SDK在Android移动手机平台上开发应用的人。它包含的信息很具价值，无论你是一个移动开发老手还是你才进入Android移动开发的世界。

It will help if readers have used mobile phones (particularly phones running Android), but it’s not necessary, nor is prior experience in mobile phone development. It’s expected that you’ll have some experience in software development and be familiar with basic development practices.
While knowledge of Java is helpful, it’s not a necessity.
对已经使用移动手机（运行着Android的手机）的读者而言，本书是有用的，但拥有Android手机不是必须的条件，同样读者也不必具备移动手机开发的经验。本书希望读者具备一些软件系统开发经验或者类似的基本的开发实践经验。

Chapters 1 and 2 introduce mobile development and contain instructions to get you started in Android.
Beyond that, there’s no requirement to read the chapters in order, although a good understanding of the core components described in Chapters 3 through 7 is important before you venture into the remaining chapters. Chapters 8 through 15 cover a variety of optional and advanced functionality and can be read in whatever order interest or need dictates.
第1、2章介绍移动开发和包含的说明来帮助你开始进入Android。然后，第3到第7章不是必读的，只是为了对其中提到的重要的核心组件有个更好的理解，否则冒险进入剩余的章节会带来风险。第8到15章覆盖了可选的和高级功能，可以根据兴趣或需要来选读。
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