Professional Android Application Development by Reto Meier

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"本书是关于专业Android应用开发的高级指南，由Reto Meier撰写，属于Wrox Programmer to Programmer系列。书名是《Professional Android™ Application Development》，适用于想要提升Android应用开发技能的专业人士。该书涵盖了Android SDK 1.0版本的所有核心功能，并深入探讨了平台的高级特性。书中通过实践示例来教授如何快速构建适用于Android手机的真实世界应用。此外，还提到了与其他Java开发相关的资源，如《Professional Java JDK6 Edition》和《Expert One-on-One™ J2EE™ Development without EJB™》，帮助读者了解更广泛的Java开发环境和非EJB的J2EE开发选项。" 在深入学习Android高级编程时，你需要掌握的关键知识点包括： 1. Android SDK：了解最新版本的Android SDK，包括API级别、工具和库，以及如何设置和管理开发环境。 2. Activity和Intent：学习如何使用Activity作为应用程序的基本构建块，以及Intent如何在不同组件之间传递数据和启动操作。 3. Services：掌握在后台运行的服务，用于执行长时间运行的任务，而不会影响用户界面。 4. Content Providers：理解内容提供者是如何让应用间共享数据的，以及如何创建自定义内容提供者。 5. Broadcast Receivers：学习如何实现广播接收器，以便在系统或应用程序事件发生时进行响应。 6. Notifications：掌握如何创建和管理通知，以便在状态栏中向用户显示信息。 7. Multitasking and Background Processing：了解Android中的多任务处理，以及如何有效地进行后台处理。 8. UI设计：熟悉Android的布局系统，包括XML布局文件，以及如何使用Material Design指导原则创建现代用户界面。 9. Fragment：学习如何使用Fragment来构建适应不同屏幕尺寸和配置的应用。 10. AsyncTask和Threads：理解如何处理异步任务和线程，以避免阻塞主线程并提高应用性能。 11. SQLite数据库：学习如何使用SQLite数据库存储和检索应用数据。 12. Networking：掌握如何处理网络通信，包括HTTP请求、JSON解析和WebSocket等。 13. Permissions：理解Android的权限模型，以及如何在应用中请求和管理权限。 14. Testing：学习如何编写单元测试和UI测试，以确保应用的质量和稳定性。 15. Performance优化：了解性能分析工具，如Traceview和Systrace，以及如何优化代码、减少内存泄漏和提高应用性能。 16. Gradle Build System：熟悉Android Studio中的Gradle构建系统，包括依赖管理和自定义构建脚本。 17. Kotlin或Java 8特性：掌握最新的编程语言特性，如Kotlin的协程和Java 8的流，以提高代码的可读性和效率。 18. Android Jetpack：了解Android Jetpack组件，包括ViewModel、LiveData和Room，以及它们如何简化开发流程。 19. Android App Bundle和Dynamic Delivery：学习如何使用App Bundle发布应用，以实现按需下载和更小的安装包。 20. Google Play Services：理解如何集成Google Play Services，利用其提供的地图、身份验证、推送通知等功能。通过深入研究这些主题，你可以进一步提升你的Android开发技能，从而构建出更高效、功能更丰富的应用。同时，阅读相关的书籍和文档，结合实践项目，将有助于巩固和深化这些知识。记得定期关注Android开发者官方更新，以便及时了解新功能和技术趋势。

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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