精通Java编程：面向Android开发者

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"Java Programming for Android Developers" 是一本由 Barry Burd 所著的书籍，针对想要学习如何使用Java编程开发Android应用的读者。本书是第二版，由John Wiley & Sons, Inc.在2017年出版。书中详细介绍了如何使用Java语言进行Android应用的开发，旨在帮助初学者和进阶开发者掌握必要的技能。 Java是一种广泛使用的面向对象的编程语言，尤其适合于Android应用开发。Android平台主要依赖Java语言构建应用程序，因为它的灵活性、稳定性和跨平台能力。本书深入浅出地讲解了Java语言的基础概念，包括语法、类、对象、数据类型、控制流以及异常处理等，这些都是编写任何Java程序的基础。在Android开发方面，本书涵盖了Android Studio的使用，这是一个集成开发环境（IDE），为开发者提供了编写、调试和运行Android应用的工具。读者将学习如何创建项目、设计用户界面、理解和使用Android组件（如活动、服务、广播接收器和内容提供者）、处理设备硬件接口、实现网络通信以及存储数据等。此外，本书还讲解了Android应用程序的生命周期管理，这是Android开发中的关键部分，因为它确保了应用在不同状态下正确运行和响应。开发者会学习到如何使用意图（Intent）来启动其他组件和服务，以及如何处理用户的输入和事件。对于更高级的主题，书中有专门章节介绍多线程和异步操作，这对于提升应用性能和用户体验至关重要。同时，还探讨了测试策略和调试技巧，帮助开发者确保代码的质量和应用的稳定性。 "Java Programming for Android Developers" 是一本全面的指南，涵盖了从Java基础到高级Android应用开发的各个层面。无论你是完全的新手还是有一定经验的开发者，都能从中获得有价值的知识和实践经验，以提升你的Android开发技能。通过这本书，读者可以逐步掌握开发出功能丰富、高效运行的Android应用所需的一切。

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2 Java Programming for Android Developers For Dummies

In general, my advice is this:

If you already know something, don’t bother reading about it.

If you’re curious, don’t be afraid to skip ahead. You can always sneak a peek at

an earlier chapter, if you need to do so.

Conventions Used in This Book

Almost every technically themed book starts with a little typeface legend, and Java

Programming for Android Developers For Dummies, 2nd Edition, is no exception.

Whatfollows is a brief explanation of the typefaces used in this book:

New terms are set in italics.

If you need to type something that’s mixed in with the regular text, the

characters you type appear in bold. For example: “Type MyNewProject in the

text eld.”

You also see this computerese font. I use computerese for Java code, le-

names, onscreen messages, and other such things. Also, if something you need

to type is really long, it appears in computerese font on its own line (or lines).

You may need to change certain things when you type them on your own

computer keyboard. For instance, I may ask you to type

public void Anyname

which means that you type public void and then a name that you make up on

your own. Words that you need to replace with your own words are set in

italicized computerese.

What You Don’t Have to Read

Pick the rst chapter or section that has material you don’t already know and start

reading there. Of course, you may hate making decisions as much as I do. If so,

here are some guidelines you can follow:

If you already know what kind of an animal Java is and you don’t care

what happens behind the scenes when an Android app runs: Skip

Chapter1 and go straight to Chapter2. Believe me— I won’t mind.

Introduction 3

If you already know how to get an Android app running: Skip Part1 and

start with Part2.

If you have experience writing computer programs in languages other

than C and C++: Start with Part2. You’ll probably nd PartII to be easy

reading. When you get to Part3, it’ll be time to dive in.

If you have experience writing computer programs in C or C++: Skim

PartII and start reading seriously in Part3. (Java is a bit dierent from C++ in

the way it handles classes and objects.)

If you have experience writing Java programs: Come to my house and help

me write Java Programming for Android Developers For Dummies, 3rd Edition.

If you want to skip the sidebars and the paragraphs with Technical Stu icons,

please do. In fact, if you want to skip anything at all, feel free.

Foolish Assumptions

In this book, I make a few assumptions about you, the reader. If one of these

assumptions is incorrect, you’re probably okay. If all these assumptions are incor-

rect...well, buy the book anyway.

I assume that you have access to a computer. Access to an Android device

is helpful but not absolutely necessary! All the software you need in order to

test Android apps on a laptop or desktop computer is freely available. You

simply download, install, and get going.

I assume that you can navigate your computer’s common menus and

dialog boxes. You don’t have to be a Windows, Macintosh, or Linux power

user, but you should be able to start a program, nd a le, put a le into a

certain directory— that sort of thing. Much of the time, when you follow the

instructions in this book, you’re typing code on the keyboard, not pointing and

clicking the mouse.

On those occasions when you need to drag and drop, cut and paste, or plug

and play, I guide you carefully through the steps. But your computer may be

congured in any of several billion ways, and my instructions may not quite t

your special situation. When you reach one of these platform-specic tasks,

try following the steps in this book. If the steps don’t quite t, consult a book

with instructions tailored to your system. If you can’t nd such a book, send

me an email. (My address appears later in the Introduction.)

4 Java Programming for Android Developers For Dummies

I assume that you can think logically. That’s all there is to application

development— thinking logically. If you can think logically, you’ve got it made.

If you don’t believe that you can think logically, read on. You may be pleasantly

surprised.

I make very few assumptions about your computer programming

experience (or your lack of such experience). In writing this book, I’ve tried

to do the impossible: make the book interesting for experienced program-

mers yet accessible to people with little or no programming experience. This

means that I don’t assume any particular programming background on your

part. If you’ve never created a loop or indexed an array, that’s okay.

On the other hand, if you’ve done these things (maybe in Visual Basic, COBOL,

or C++), you’ll discover some interesting plot twists in Java. The creators of Java

took the best ideas from object-oriented programming, streamlined them,

reworked them, and reorganized them into a sleek, powerful way of thinking

about problems. You’ll nd many new, thought-provoking features in Java. As

you nd out about these features, many of them will seem quite natural to

you. One way or another, you’ll feel good about using Java.

How This Book Is Organized

This book is divided into subsections, which are grouped into sections, which

come together to make chapters, which are lumped, nally, into ve parts (like

one of those Russian matryoshka dolls). The parts of the book are described here.

Part 1: Getting Started with Java

Programming for Android Developers

Part1 covers all the nuts and bolts. It introduces you to the major ideas behind

Java and Android software development and walks you through the installation of

the necessary software products. You also run a few simple Java and Android

programs.

The instructions in these chapters cover both Windows and Macintosh computers.

They cover many computer congurations, including some not-so-new operating

system versions, 32-bit systems and 64-bit systems, and situations in which you

already have some form of Java on your computer. But installing software is

always tricky, and you might have a few hurdles to overcome. If you do, check the

end of this chapter for ways to reach me (the author) and get some quick advice.

(Yes, I answer emails, tweets, Facebook posts, and notes sent by carrier pigeons.)

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