专业Android应用程序开发实战

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"这是一本关于专业Android应用开发的书籍，涵盖了Android SDK 1.0版本的全部核心功能，并深入探讨了平台的高级特性。作者Reto Meier旨在通过实践性的示例帮助读者快速构建适用于Android手机的真实世界应用程序。书中还提到了与Java JDK 6的关联，并对比介绍了不使用EJB的J2EE开发方法。" 在这本《Professional Android™ Application Development》中，读者将学习到一系列关键的Android开发知识点： 1. **Android SDK 1.0**：这是Android开发的基础，包含了一系列工具和库，使得开发者能够创建、测试和调试Android应用程序。书中会详细介绍如何使用这个SDK，包括API级别的变化和新功能。 2. **核心功能**：书中会讲解如何利用Android的用户界面组件、事件处理、数据存储（SQLite数据库）、网络通信、多媒体支持、传感器接口等进行应用开发。 3. **高级特性**：包括服务、广播接收器、内容提供者、通知管理、多线程处理、异步任务、权限管理和安全性等方面，这些都是构建复杂和高效应用所必需的知识。 4. **Java JDK 6**：虽然本书主要关注Android开发，但也会涉及Java语言的基础和进阶，因为Android应用程序是用Java编写的。读者将学习如何利用JDK 6的新特性和工具，如泛型、枚举、可变参数、增强的for循环等。 5. **EJB替代方案**：在《Expert One-on-One™ J2EETM Development without EJBTM》一书的提及表明，此书可能会讨论如何在不依赖企业JavaBean（EJB）的情况下进行J2EE开发，可能包括轻量级框架如Spring或Struts，以及使用开源工具如Ant、JUnit和Hibernate的方法。 6. **实践示例**：书中强调“动手实践”，这意味着每个概念都会伴随着具体的代码示例，让读者能够边学边做，提高技能。 7. **源代码**：随书提供的源代码可以让读者更深入地理解代码实现，同时也是实际项目开发的参考。 8. **技术支持**：通过Wrox网站提供的更新和技术支持，读者可以得到最新的信息和解决问题的帮助。对于希望提升Android开发技能的专业人士来说，这本书提供了全面且深入的指导，不仅覆盖了基础，也触及了高级主题，是职业发展的重要资源。

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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