专业Android应用开发实战

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"专业Android™应用程序开发" 本书是针对"(英文版)android高级编程"主题的专业指南，旨在帮助开发者深入理解并提升在Android平台上的应用开发技能，从而推进职业生涯。书名《Professional Android™ Application Development》表明了其专业性和深度，适合已经有一定基础的Android开发者进一步提升。书中的内容全面覆盖了Android SDK 1.0版本的所有关键特性，并且探讨了高级功能。作者Reto Meier通过简洁明了且具有吸引力的实例，引导读者快速构建适用于Android手机的现实世界应用。这种实践性的方法使得学习过程更加高效，能够帮助开发者迅速将理论知识转化为实际操作能力。书中涉及的知识点包括但不限于： 1. **Android SDK基础**：了解如何安装和配置Android SDK，以及如何使用它来创建、调试和测试应用程序。 2. **Android应用程序架构**：深入理解Activity、Intent、Service、BroadcastReceiver和ContentProvider等核心组件的工作原理及它们在应用程序中的作用。 3. **用户界面设计**：学习使用XML布局文件创建用户界面，以及使用Android提供的各种视图和控件。 4. **数据存储**：探讨SQLite数据库的使用，以及如何在Android中持久化数据。 5. **网络编程**：了解如何进行HTTP通信，实现网络请求和响应处理。 6. **多线程与异步处理**：掌握在Android中处理多线程和异步任务的最佳实践，如使用AsyncTask或IntentService。 7. **权限管理**：理解Android的权限模型，如何在应用程序中正确请求和处理权限。 8. **图形和动画**：学习如何利用OpenGL ES进行图形渲染，以及如何创建平滑的用户界面动画。 9. **性能优化**：探讨内存管理、CPU使用率和电池效率的优化策略。 10. **测试与调试**：学习如何编写单元测试，进行UI测试，以及使用Android Studio的调试工具。 11. **版本更新和兼容性**：了解如何处理版本更新问题，以及如何确保应用在不同Android设备上的兼容性。此外，书中还提到了其他相关书籍，如《Professional Java JDK6 Edition》，它涵盖了JDK的最新特性，包括Ant、JUnit和Hibernate等开源工具的使用，这对于一个全面的Android开发者来说也是必备的知识。另一本《Expert One-on-One™ J2EE™ Development without EJB™》则提供了不依赖EJB的J2EE开发解决方案，这对于理解服务器端开发和集成Android应用可能非常有用。这本书是Android开发者进阶的宝贵资源，无论是在技术深度还是广度上，都能为开发者提供全面的指导，助其在Android应用开发领域更上一层楼。通过学习这些内容，开发者不仅可以提升个人技能，还能为自己的职业发展打开新的机遇。

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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