Android高级编程：实战指南与专业发展

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"《专业Android应用开发指南》是一本公认的Android高级编程的经典之作，专为希望提升Android技能的学习者设计。该书由Reto Meier编著，旨在提供实践导向的教学，帮助读者快速构建现实世界的移动应用程序，适用于Android手机的最新版本1.0 Android SDK。书中详尽探讨了Android的基础功能和高级特性，让开发者能够深入理解和掌握Android平台。同时，书中还推荐了《专业Java JDK 6版》作为参考资料，它在Ivor Horton的《初学者Java 2》基础上，讲解了最新JDK的核心功能，以及如Ant、JUnit和Hibernate等开源工具的使用。这将使读者对专业Java开发环境有全面的认识，为职业生涯的进一步发展打下坚实基础。对于那些寻求EJB之外的J2EE开发解决方案的专家，可以参考《一对一专家：不依赖EJB的J2EE开发》。这本书提供了实用的手把手教程，展示如何利用其他技术替代EJB，帮助读者探索更为灵活和多样化的J2EE开发路径。《专业Android应用开发》不仅适合初级开发者进阶，也对有一定经验的开发人员扩展技能库非常有价值。无论是Android技术的深度理解，还是Java专业技能的提升，都能在这套资源中找到相应的支持。读者可以通过www.wrox.com获取更新、源代码以及Wrox的技术支持，确保始终紧跟技术潮流。"

xiv

Contents

Accessing Android Hardware 31Chapter 10: 5

Using the Media APIs 316

Playing Media Resources 316

Recording Multimedia 317

Using the Camera 319

Controlling Camera Settings 319

Using the Camera Preview 320

Taking a Picture 320

Introducing the Sensor Manager 321

Using the Accelerometer and Compass 323

Introducing Accelerometers 324

Detecting Acceleration Changes 324

Creating a Speedometer 326

Determining Your Orientation 329

Creating a Compass and Artiﬁ cial Horizon 330

Android Telephony 333

Making Phone Calls 334

Monitoring Phone State and Phone Activity 334

Monitoring Data Connectivity and Activity 337

Accessing Phone Properties and Status 338

Controlling the Phone 338

Using Bluetooth 339

Introducing the Bluetooth Service 339

Controlling the Local Bluetooth Device 340

Discovering and Bonding with Bluetooth Devices 340

Managing Bluetooth Connections 342

Communication with Bluetooth 342

Using a Bluetooth Headset 344

Managing Network and Wi-Fi Connections 345

Monitoring and Managing Your Internet Connectivity 345

Managing Active Connections 346

Managing Your Wi-Fi 347

Controlling Device Vibration 350

Summary 351

Advanced Android Development 35Chapter 11: 3

Paranoid Android 354

Linux Kernel Security 354

Introducing Permissions 354

Declaring and Enforcing Permissions 355

Enforcing Permissions with Broadcasting Intents 355

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Introduction

Now is an exciting time for mobile developers. Mobile phones have never been more popular, and pow-

erful smartphones are now a regular choice for consumers. Stylish and versatile phones packing hard-

ware features like GPS, accelerometers, and touch screens are an enticing platform upon which to create

innovative mobile applications.

Android hardware will be designed to tempt consumers, but the real win is for developers. With

existing mobile development built on proprietary operating systems that restrict third-party applica-

tions, Android offers an open and equal alternative. Without artiﬁ cial barriers, Android developers

are free to write applications that take full advantage of increasingly powerful mobile hardware. As a

result, developer interest in Android devices has made their 2008 release a hugely anticipated mobile

technology event.

Built on an open source framework, and featuring powerful SDK libraries and an open philosophy,

Android has opened mobile phone development to thousands of developers who haven’t had access to

tools for building mobile applications. Experienced mobile developers can now expand into the Android

platform, leveraging the unique features to enhance existing products or create innovative new ones.

This book is a hands-on guide to building mobile applications using version 1.0 of the Android soft-

ware development kit. Chapter by chapter, it takes you through a series of sample projects, each intro-

ducing 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.

Since Android is a brand-new, version 1 product, there are only a small number of handsets currently

available that support it. As with any early release, there are likely to be regular changes and improve-

ments to the software and development libraries. The explanations and examples included in this book

will give the grounding and knowledge you need to write compelling mobile applications using the

current SDK, along with the ﬂ exibility to quickly adapt to future enhancements.

Whom This Book Is For

This book is for anyone interested in creating applications for the Android mobile phone platform. It

includes information that will be valuable, whether you’re an experienced mobile developer or making

your ﬁ rst foray, via Android, into writing mobile applications.

It will help if readers have used mobile phones (particularly phones running Android), but it’s not nec-

essary, nor is prior experience in mobile phone development. It’s expected that you’ll have some experi-

ence in software development and be familiar with basic development practices. While knowledge of

Java is helpful, it’s not a necessity.

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 6 is important before you venture into the remaining

chapters. Chapters 7 through 11 cover a variety of optional and advanced functionality and can be read

in whatever order interest or need dictates.

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Introduction

xviii

What This Book Covers

Chapter 1 introduces Android, including what it is and how it ﬁ ts into existing mobile development.

What Android offers as a development platform and why it’s an exciting opportunity for creating

mobile phone applications are then examined in greater detail.

Chapter 2 covers some best practices for mobile development and explains how to download the

Android SDK and start developing applications. It also introduces the Android developer tools and

demonstrates how to create new applications from scratch.

Chapters 3 through 6 take an in-depth look at the fundamental Android application components.

Starting with examining the pieces that make up an Android application and its life cycle, you’ll quickly

move on to the application manifest and external resources before learning about “Activities,” their life-

times, and their life cycles.

You’ll then learn how to create User Interfaces with layouts and Views, before being introduced to

the Intent mechanism used to perform actions and send messages between application components.

Internet resources are then covered before a detailed look at data storage, retrieval, and sharing. You’ll

start with the preference-saving mechanism before moving on to ﬁ le handling and databases. This sec-

tion ﬁ nishes with a look at sharing application data using Content Providers.

Chapters 7 to 10 look at more advanced topics. Starting with maps and location-based services, you’ll

move on to Services, background Threads, and using Notiﬁ cations.

Android’s communication abilities are next, including sending and receiving messages through instant

messaging and SMS. Hardware is then covered, starting with media recording and playback, before

introducing the camera, accelerometers, and compass sensors. Chapter 10 concludes with a look at

phone and networking hardware, starting with telephony APIs and going on to Bluetooth and network

management (both Wi-Fi and mobile data connections).

Chapter 11 includes several advanced development topics, among them security, IPC, advanced graph-

ics techniques, and user–hardware interactions.

How This Book Is Structured

This book is structured in a logical sequence to help readers of different development backgrounds

learn how to write advanced Android applications.

There’s no requirement to read each chapter sequentially, but several of the sample projects are developed

over the course of several chapters, adding new functionality and other enhancements at each stage.

Experienced mobile developers with a working Android development environment can skim the ﬁ rst

two chapters — which are an introduction to mobile development and instructions for creating your

development environment — and dive in at Chapters 3 to 6. These cover the fundamentals of Android

development, so it’s important to have a solid understanding of the concepts they describe. With this

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