精通Android应用开发：实战指南

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"Professional Android Application Development" 是一本专为Android开发人员设计的专业指南，旨在帮助开发者深入理解并掌握Android应用开发的各个方面。这本书以其简洁明了的写作风格和丰富的实例，引导读者快速构建实际的Android手机应用。内容涵盖Android SDK 1.0版本的所有基本特性，并进一步探讨了高级功能。在本书中，读者可以学习到： 1. **Android SDK基础知识**：包括Android开发环境的搭建，Android Studio的使用，以及Android项目的创建和管理。 2. **UI设计**：Android布局管理器的使用，如LinearLayout、RelativeLayout和ConstraintLayout，以及自定义视图的创建。 3. **Activity和Intent**：理解Activity的生命周期，如何通过Intent进行应用间的通信，以及启动服务和广播接收器的方法。 4. **数据存储**：SQLite数据库的使用，SharedPreferences的简单数据存储，以及文件系统的操作。 5. **多线程和异步处理**：理解线程的基本概念，使用Handler、Looper和AsyncTask进行异步操作，以及IntentService的应用。 6. **网络编程**：HTTP请求的实现，使用HttpURLConnection或OkHttp库进行网络访问，以及WebSocket通信。 7. **传感器和位置服务**：集成GPS和其他传感器，获取用户的位置信息，实现地图和导航功能。 8. **多媒体支持**：播放音频和视频，使用Camera API进行拍照和录制视频。 9. **通知和推送服务**：利用Notification API创建系统通知，集成Google Cloud Messaging (GCM) 或 Firebase Cloud Messaging (FCM) 实现远程推送消息。 10. **安全性与权限管理**：应用安全的最佳实践，处理敏感数据，以及请求和管理运行时权限。 11. **性能优化**：内存管理和性能调试技巧，使用ProGuard进行代码混淆和优化，以及应用的性能分析工具。 12. **测试与发布**：单元测试和集成测试的编写，应用的签名和发布流程，以及Google Play Store的提交指南。此外，书中可能还提供了对Java JDK 6版的介绍，帮助开发者了解核心特性，以及如何使用Ant、JUnit和Hibernate等开源工具进行项目构建和测试。另外，书中的“Expert One-on-One J2EE Development without EJB”部分可能会探讨在不使用EJB的情况下进行J2EE开发的替代方案。 "Professional Android Application Development" 是一本全面的进阶读物，适合有一定Java基础并且希望提升Android应用开发技能的程序员。通过阅读此书，开发者不仅可以深化对Android平台的理解，还能提高自己的职业竞争力。

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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