Unlocking Android：开发者指南

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"Unlocking Android pdf" 是一本由 Frank Ableson、Charlie Collins 和 Robi Sen 合著的书籍，由 Manning 出版社发行。这本书是Android应用开发者的指南，旨在帮助读者深入理解并掌握Android操作系统的核心技术。本书的内容可能涵盖了Android系统的基本架构，包括Dalvik虚拟机的工作原理，Android应用程序的生命周期管理，以及如何使用Android SDK进行应用程序开发。作者们可能详细解释了如何创建用户界面，处理用户输入，以及与硬件组件如摄像头或GPS的交互。此外，书中的章节可能还涉及到了网络通信、数据存储（如SQLite数据库）和多线程编程。书中可能还包括了关于Android的调试技巧，性能优化策略，以及如何发布和分发应用程序到Google Play Store的相关知识。作者可能会分享他们在实际开发过程中的经验和最佳实践，帮助读者避免常见错误，并提升代码质量。 "Unlocking Android" 可能还涵盖了Android的权限管理系统，如何处理运行时权限请求，以及如何设计符合Android安全模型的应用程序。此外，对于那些想要对Android系统进行定制和修改的高级开发者，书中可能包含了一些关于系统级应用程序开发和内核编译的深入内容。书的前言是由 Dick Wall 撰写的，他可能提供了关于Android开发领域的见解，以及为什么这本书对开发者来说是必不可少的参考资源。附录和索引部分可能提供了更多的资源链接，帮助读者进一步扩展他们的学习。 "Unlocking Android" 是一本全面的Android开发指南，适合初学者和经验丰富的开发者，它将帮助他们解锁Android平台的潜力，提升开发技能，以构建高效、稳定且用户友好的应用程序。通过阅读此书，读者可以深入了解Android系统的内部运作，从而更好地应对开发挑战。

preface

The first mobile applications I had the opportunity to work with were inventory con-

trol programs used in retail and manufacturing settings. The “terminals,” as we called

them at the time, were heavy and expensive. They had big antennas, lots of clunky

keys, grayscale

LCD displays, and they looked like they came straight from the set of a

science fiction movie.

From that austere beginning, my mobile horizons expanded when the Palm

Pilot™ became the craze in the mid to late 1990s. My first significant Palm

OS™ proj-

ect was to develop an

IrDA™ communications library for an application which printed

Calendars, Contacts, and Task-lists. Back then the “hip” printers had an

IrDA™ port

and it was cool to “beam” your business card to someone. Ironically, I always enjoyed

designing and writing the software more than using the devices themselves.

Fast forward ten years, and I have had the privilege of working on some very chal-

lenging and engaging mobile software projects for numerous clients along the way.

Much of my career to date can be traced back to relationships stemming from my

early mobile development experiences—and what a blessing it has been for me. I just

love the question, “would it be possible to…?” And more often than not, the answer

has been “Yes!” What I particularly enjoy is helping change the way a business operates

or the way problems are solved through the application of mobile software. Mobile

technology can and will continue to change the way we live, work and play…and this

brings me to Android and this book.

In the fall of 2007 I was speaking with my friend Troy Mott, who happens to also be

an editor for Manning, the publisher of this book. Troy and I were discussing the

Licensed to Deborah Christiansen <pedbro@gmail.com>

Download at Boykma.Com

PREFACE

xvi

mobile marketplace, something we have done for years. We started kicking around

the 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 prom-

ised to be open, capable, and popular. We felt that those ingredients could make for

an interesting 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

two times 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, 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 applications 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.

RANK ABLESON

Licensed to Deborah Christiansen <pedbro@gmail.com>

Download at Boykma.Com

ACKNOWLEDGMENTS

xviii

Thanks also to Dick Wall, who played the dual role of reviewing our work and writ-

ing the foreword. And special thanks to the other reviewers who took time out of their

busy schedules to read our manuscript at different times during its development:

Bruno Lowagie, Hannu Terävä, Maxim Yudin, Dierk König, Michael Martin, Charles

Hudson, Gabor Paller, Scott Webster, Aleksey Nudelman, Horaci Macias, Andrew

Oswald, Kevin P. Galligan, Chris Gray, and Tyson S. Maxwell.

Lastly, we want to thank the thoughtful and encouraging

MEAP subscribers who

provided feedback along the way; the book is better thanks to their contributions.

FRANK ABLESON

I would like to thank Charlie Collins, Robi Sen, and Troy Mott for their contributions,

collaboration, and endurance on this project! And to my wife Nikki and children,

Julia, Tristan, Natalie, Aidan and Liam—it’s done! In particular, I want to thank my

son Tristan who was a steady source of encouragement throughout this process,

enthusiastically asking how it was going and spurring me toward the finish. Lastly, I

would like to thank Barry Quiner and Michael Petrin for their consistent encourage-

ment and friendship.

CHARLIE COLLINS

To begin, I would like to thank my coauthors, Frank Ableson and Robi Sen, who

worked diligently on this project from the start, and who welcomed me into the fold.

It’s finally a book, guys; thanks, and congratulations. Additionally, I would like to reit-

erate my gratitude to everyone at Manning.

I would also like to thank the Open Handset Alliance, and the entire Android

team. Having an open, yet concise and focused, mobile platform such as Android is a

huge plus for the technological world, and for users. It’s not perfect, yet, but it’s a

long race and the approach and collaboration can’t be underestimated. Along the

same lines I would like to thank all of the other contributors to the open tools I used

to work on this project, including: Ubuntu Linux, OpenOffice, Eclipse, Subversion,

GIMP, and Java.

I also want to thank my friends and family, who once again put up with my taking

huge amounts of time away from our shared activities to work on a “tech” book. Many

of the people I care about the most will probably read this book up to about, well,

here—if they ever pick it up at all. If you are one of those people, thanks. Specifically,

my wife Erin, and my daughters Skylar and Delaney, were always supportive and even

feigned excitement at the right times to keep me going. My parents Earl and Margaret

Farmer were instrumental as always. My mountain biking/fishing/engine building

buddy Mike Beringson put up with more than his share of “Sorry, I can’t make it” phone

calls. And, my neighbors in the cul-de-sac crew also helped get me through it: the

Cheathams, the Thomspons, the Crowders, and the Haffs—thanks again to everyone.

Licensed to Deborah Christiansen <pedbro@gmail.com>

Download at Boykma.Com

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