Android开发实战：Android Action教程

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"这是一本纯英文的Android开发教程——'Android in Action Second Edition'，由Frank Ableson、Robi Sen和Chris King合著。本书是'Revised Edition of Unlocking Android'的更新版本，由Manning出版社出版。教程中包含了大量的小示例项目（demo），适合开发者下载学习Android开发知识。" 在Android开发领域，"Action"通常指的是Intent的动作，Intent是Android系统中用于组件间通信的重要机制。本教程可能深入讲解了如何创建和使用Intent来启动活动（Activity）、服务（Service）或其他组件。此外，由于是"Second Edition"，意味着它包含了对最新Android版本的更新和改进，可能涵盖了Android API的新特性、最佳实践以及性能优化等内容。 "Android in Action"第二版可能会涵盖以下关键知识点： 1. **Android基础**：包括Android应用程序结构、生命周期、布局管理器（如LinearLayout、RelativeLayout等）以及用户界面组件（Button、EditText等）的使用。 2. **Intent和Activity管理**：详述Intent的构造和类型（显式与隐式）、启动Activity以及处理返回结果的方法。 3. **Service**：解释Service的启动、绑定和生命周期，以及如何在后台执行长时间任务。 4. **BroadcastReceiver**：介绍广播接收器的使用，用于监听系统或自定义广播事件。 5. **Content Provider**：讲解如何实现数据共享和存储，包括SQLite数据库的使用。 6. **Fragment**：探讨在多屏设备上使用Fragment进行UI设计，以及Fragment之间的通信。 7. **权限管理**：阐述如何在AndroidManifest.xml中声明和处理权限。 8. **异步编程**：涉及AsyncTask、Loader、Handler、Thread和Runnable等并发编程技术。 9. **网络编程**：如何进行HTTP请求，使用 Volley、OkHttp 或 Retrofit 库进行网络通信。 10. **多媒体支持**：介绍音频、视频和图像处理，如播放、录制和显示。 11. **通知和推送**：讲解如何创建和管理通知，以及集成Google Cloud Messaging (GCM) 或 Firebase Cloud Messaging (FCM) 实现推送通知。 12. **性能优化**：包括内存管理、UI流畅性提升、代码性能分析工具的使用等。 13. **测试和调试**：介绍单元测试、 Espresso UI 测试和持续集成的最佳实践。 14. **Android应用发布流程**：从签名到打包，再到上传至Google Play Store的完整过程。 Manning出版社的书籍通常以高质量和技术深度闻名，因此这个教程很可能提供了丰富的实践案例和深入的理论解释，帮助读者从初学者到熟练掌握Android开发技能。同时，书中可能还包含了对Android开发中遇到的常见问题的解答，以及作者们的经验分享，对任何想要深入理解Android平台的开发者来说都是宝贵的资源。

xvii

preface

When we set out to write the first version of this book, many friends and family won-

dered just what this Android thing was all about. Now, two years after the publication

of the first edition, Android is nearly a household term.

The first edition of the book, Unlocking Android, enjoyed enough success that we

were privileged to have the opportunity to write this second edition, renamed as

Android in Action. The first thirteen chapters of the book have been refreshed and/or

rewritten to bring the content up to date with Android 2.2+. Six chapters were added,

bringing in more topics of interest that stray from the simplistic but are still within the

realm of instructional and informational. The new content extends beyond the basics

of Android development, including some topics that I’ve envisioned for a long time

but lacked the proper platform to bring them to fruition. We could have written many

more chapters, but we had to draw the line somewhere!

The second edition of this book was written by Frank Ableson, Robi Sen, and Chris

King. Chris updated chapters 4, 5, 7, and 11. Some excellent content originally writ-

ten by Charlie Collins remains in this second edition. Early on in the project Chris

and I were discussing the need to bring social networking into the book. Chris exam-

ined the available social networks and came back with a clever mechanism to integrate

the Android contacts database with the popular business networking service

LinkedIn. His work is shown in chapter 15, “Integration.” The application from chap-

ter 15 is available as a free download in the Android Market.

Robi updated his chapters on notifications, graphics, and media, while I focused

on some new content areas of interest, including Bluetooth communications, sen-

sors, localization, AppWidgets, native development in C, and web development for

Android.

PREFACE TO THE FIRST EDITIONxx

idea of writing a book on Android. The challenge was that Android didn’t really exist.

Yet. We knew from some of the preliminary information that the platform promised to

be open, capable, and popular. We felt that those ingredients could make for an inter-

esting and valuable topic, so we began thinking about what that book might look like,

taking it on faith that the platform would actually come to fruition.

Before long, we convinced ourselves (and Manning) that this was a good idea and

the work began in early 2008. Beyond the usual challenges of putting a book together,

we had the additional obstacle that our subject matter has been in a steady, though

unpredictable, state of change over the past year. In essence, we’ve written this book

twice because the SDK has been changed multiple times and Android-equipped

phones have become available, accelerating the interest and demand for the plat-

form. Every time a significant change occurred, we went back and revisited portions of

the book, sometimes rewriting entire chapters to accommodate the latest develop-

ments in the Android platform.

I say “we” because in the process of writing this book, Troy and I decided to share

the fun and brought in two experienced authors to contribute their expertise and

enthusiasm for this platform. It has been a pleasure getting to know and working with

both Charlie Collins and Robi Sen. While I focused on the first and third parts of the

book in the first edition, Charlie and Robi wrote part 2, which covers the important

fundamentals of writing Android applications. Thanks to their contributions, I

enjoyed the freedom to express my vision of what Android means to the mobile space

in the first part of the book, and then to work on a couple of more advanced applica-

tions at the end of the book.

We hope that you enjoy reading this book and that it proves to be a valuable

resource for years to come as together we contribute to the future of the Android

platform.

FRANK ABLESON

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