精通Android应用开发

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"Professional Android™ Application Development - Reto Meier - Wiley Publishing" 本书《Professional Android™ Application Development》由Reto Meier撰写，是Wiley Publishing出版的一本专业级Android应用程序开发指南，面向那些希望提升技能、推进职业发展的开发者。这本书特别强调了实际操作，通过简洁而引人入胜的例子，向读者展示如何快速为Android手机构建现实世界中的应用程序。书中涵盖了Android SDK 1.0的所有关键特性，并深入探讨了Android的高级功能。在本书中，读者将学习到： 1. **Android SDK 1.0的基础和核心概念**：了解Android平台的基础架构，包括Android应用程序模型、用户界面设计、活动（Activity）管理以及Intent系统。 2. **开发环境设置与调试**：如何配置和优化开发环境，包括使用Android Studio，调试工具的使用，以及版本控制系统的集成。 3. **UI设计**：掌握Android布局和控件的使用，创建响应式和用户友好的界面，以及适配不同屏幕尺寸和分辨率的技巧。 4. **数据存储**：了解SQLite数据库的使用，共享首选项和文件存储，以及如何实现数据持久化。 5. **网络编程**：学习如何进行HTTP通信，使用WebSocket进行实时通信，以及处理异步任务和后台服务。 6. **多媒体支持**：集成音频、视频和图像处理，包括相机API的使用和多媒体文件的管理。 7. **传感器与硬件交互**：掌握如何利用加速度计、GPS、陀螺仪等硬件设备进行应用开发。 8. **通知与消息推送**：实现本地通知和远程推送通知，如Google Cloud Messaging (GCM) 或 Firebase Cloud Messaging (FCM)。 9. **安全性与隐私保护**：理解Android应用的安全最佳实践，包括权限管理、数据加密和防止恶意软件攻击。 10. **性能优化**：学习如何通过代码分析和性能测试来提高应用的运行效率，减少内存泄漏和CPU占用。 11. **版本管理和发布流程**：理解版本控制策略，如何进行应用打包和发布到Google Play Store。此外，书中还可能涵盖与其他Java技术的结合，比如与Java JDK 6的相关内容，以及如何在没有Enterprise JavaBeans (EJB)的情况下进行J2EE开发，这可能涉及到开源工具的使用，如Ant构建工具、JUnit测试框架和Hibernate对象关系映射（ORM）工具。通过本书，开发者不仅可以获得Android开发的专业知识，还能了解到如何利用这些技术来解决实际问题，从而在移动应用开发领域取得显著的进步。对于想要在Android平台上构建高质量、高性能应用的专业人士来说，这是一本不可多得的参考资料。

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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