精通Android应用程序开发

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"Professional Android Application Development" 本书《Professional Android Application Development》是一本专注于深度学习Android应用开发的专业指南，由Reto Meier撰写，属于Wrox Programmer to Programmer系列。该书全面覆盖了Android SDK 1.0版本的重要特性，并探讨了平台的高级功能，旨在帮助开发者快速构建实际的、面向真实世界的Android手机应用。本书内容丰富，特点鲜明，包括以下关键知识点： 1. **基础入门**：书中详细介绍了Android开发环境的搭建，包括Android SDK的安装和配置，以及Android Studio的使用，让开发者能够快速上手。 2. **UI设计**：讲解了Android的布局管理器和视图组件，如何创建用户界面，以及适配不同屏幕尺寸和方向的策略。 3. **活动（Activity）管理**：详细阐述了Android应用的核心组件——活动，包括活动的生命周期、启动模式、任务栈和返回栈等概念。 4. **服务（Service）与广播接收器（Broadcast Receiver）**：讨论了在后台运行的服务以及如何实现应用间的通信，以及系统事件的监听和响应。 5. **内容提供者（Content Provider）**：介绍了数据存储和共享的方式，包括SQLite数据库的使用和内容提供者的实现。 6. **Intent机制**：详细解析了Intent的作用，如何通过Intent进行组件间通信和启动服务。 7. **多线程与异步处理**：讲解了Android中的线程模型，如何避免UI线程阻塞，以及AsyncTask和Handler的使用。 8. **网络编程**：涵盖了HTTP通信、Socket编程，以及如何处理网络请求和响应。 9. **权限管理**：解释了Android的权限模型，如何在Manifest文件中声明和处理权限。 10. **硬件访问**：介绍了如何访问设备的硬件特性，如GPS、摄像头、传感器等。 11. **通知与消息推送**：讲解了如何使用通知栏通知用户，以及Google Cloud Messaging (GCM)或Firebase Cloud Messaging (FCM)的集成。 12. **测试与调试**：涵盖了单元测试、集成测试，以及如何利用Android Studio的调试工具进行问题排查。 13. **性能优化**：提供了提高应用性能的技巧，包括内存管理和渲染优化。 14. **国际化与本地化**：如何使应用支持多种语言和文化设置。此外，该书还提供了源代码示例，读者可以通过实践来巩固理论知识。作者Reto Meier是Android领域的知名专家，他的经验和见解使得这本书成为Android开发者必备的参考书籍之一。与本书类似，如《Professional Java JDK6 Edition》和《Expert One-on-One J2EE Development without EJB》这样的资源，都是为了提升开发者的技术水平和职业发展。它们分别关注Java核心特性和J2EE开发中的非EJB解决方案，同样具有深度和实用性，可以作为Android开发者拓宽技能树的补充读物。

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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