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■ INTRODUCTION

xxii

nybody can start building simple apps for the Android platform, and this

book shows you how. Android Apps for Absolute Beginners takes you

through the process of getting your first Android applications up and running,

using plain English and practical examples. It cuts through the fog of jargon

and mystery that surrounds Android application development and gives you

simple, step-by-step instructions to get you started.

This book teaches Android application development in language anyone can

understand, giving you the best possible start in Android development. It pro-

vides clear examples that make learning easy, allowing you to pick up the con-

cepts without fuss. And it offers clear code descriptions and layout so that you

can get your apps running as soon as possible.

What you’ll learn:

•

How to get both yourself and your computer set up for Android app

development.

•

How to use the Eclipse programming environment to make your

Android development efficient and straightforward.

•

How to build simple apps in clear steps and get them working

immediately.

•

How to style your application so that it looks great.

•

How to make the most of the Android’s touchscreen.

•

Ways to use shortcuts and cheat sheets to create apps the easy way.

•

The basics of Java and XML to let you move on to advanced apps.

If you have a great idea for an Android app but have never programmed before,

then this book is for you. You don’t need any previous computer programming

skills—as long as you have a desire to learn, and you know which end of the

mouse is which, the world of Android app development awaits.

Android Apps

for Absolute Beginners

Wallace Jackson

Get started building your very own

Android apps

Android Apps

xiii

Introduction

Over the last two years, Google’s Android operating system (OS) has gone from a virtually

unknown open source solution to the current mobile OS market leader among all mobile

handsets, with over one-third of the market share, and it’s still climbing rapidly. Android has even

started to dominate the tablet OS marketplace, and is also the foundation for the popular iTV OS

known as GoogleTV. There seems to be no end in sight for Android’s rocketing success, which is

great news for owners of this book.

I’ve heard a great many people say, “I have a really phenomenal idea for a smartphone

application! Can you program it for me!?” Rather than sit back and code all of these applications

for everyone, I thought it might be a smarter idea to write a book about how an absolute beginner

could code an Android application using open source tools that cost nothing to download and

that are free for commercial use, and then leverage that new found knowledge to reach their

dream of making their application idea a revenue-generating reality.

Thanks to open source and Google’s Android development environment, Oracle’s Java

programming Language, Linus Torvald’s Linux operating system, the Eclipse code editing

software, and this book, vaporizing a software product out of thin air, and at no production cost

other than your PC and “sweat equity,” is now a complete reality.

The Target: The Programming Neophyte

As you may have inferred from the title, this book assumes that you have never programmed

before in any programming language. It is written for someone who has never written a single

line of code before, and who is thus unfamiliar with object-oriented programming (OOP)

languages such as Oracle’s Java and mark-up languages such as XML. Both of these open source

languages are used extensively in creating Android applications.

There are lots of Java and Android books out there, but all of these books assume you have

programmed before, and know all about OOP. I wanted to write a book that takes readers from

knowing absolutely nothing about programming or knowing how to install a Software

Development Kit (SDK) and Integrated Development Environment (IDE)

all the way to being

able to program Android applications using Java and XML.

The Weapon: Android, the Innovative Mobile Code

Environment

Android is my Internet 2.0 development weapon of choice, because it allows me to develop highly

advanced applications for the primary Internet 2.0 devices, including the main three where

revenue potential is by far the greatest:

■ INTRODUCTION

xiv

• Smartphones

• Tablets

• iTV or Interactive Television

The other reason I place my bets on Android is because it is open source, and thus free from

royalties and politics. I do not have to submit my Android application to any company and ask

permission to publish it, as long as it is not harmful in any way to others. For this reason, and due

to the free for commercial use nature of open source software, there is little external risk involved

in developing an application for the Android Platform.

How This Book Is Organized

Because this is a book for absolute beginners, we start at the very beginning, showing where to

download and how to install the various Android, Java, and Eclipse environments, as well as how

to configure these environments and how to set them up for application development and

testing. This in itself is no easy task, and must be done correctly, as these tools provide the

foundation for all of our Android development, debugging, and testing for the remainder of the

book.

Next I will provide you with an overview of where Android came from, why, how, and when

Google acquired it, and how it is uniquely structured among software development platforms. I

will introduce XML, Java, OOP, and Android concepts soon after that, as well as cover how

Android manages its screen layout. We will then move these concepts into use in later chapters in

the second half of the book; these chapters explain the most important concepts in Android in

their most logical order as they pertain to applications development.

In that second half of the book, we’ll start getting into developing a user interface (UI), as that

is the front-end or interface for your user to your Android application. Soon after we'll cover how

your UI talks to your application via events processing. To spice up your application’s visual

appearance, we’ll get into graphics, animation, and video, and then get into even more advanced

topics after that, such as databases and communications.

Finally we will look at some of the advanced features of Android that you will want to visit

after finishing the book; these are topics that are too advanced for a first book on Android but

which provide some of the coolest features in smartphone development today.

We’ll walk you through all of these topics and concepts with screenshots of the IDE and

visual examples and then take you though step-by-step examples reinforcing these concepts.

Sometimes we will repeat previous topics to reinforce what you have learned and apply these

skills in new ways. This enables new programmers to re-apply development skills and feel a sense

of accomplishment as they progress.

The Formula for Success

Learning to develop an Android application is an interactive process between you and the tools

and technologies (Eclipse, XML, Java, Android, and so on) that I cover in this book. Just like

learning to play a sport, you have to develop skills and practice them daily. You need to work

through the examples and exercises in this book, more than once if necessary to become

comfortable with each concept.

Just because you understand a concept that doesn’t necessarily mean you will know how to

apply it creatively and use it effectively; that takes practice, and ultimately will happen when the

“ah-ha” moment occurs, when you understand the concept in context with the other concepts

that interconnect with it.

You will learn quite a bit about how Android works from this introductory book. You will

glean a lot of insight into the inner working of Android by working through all of the exercises in

this book. But you will also learn new things not specifically mentioned in this book when you

compile, run and debug your programs. Spending time experimenting with your code and trying

剩余339页未读，继续阅读

评论收藏

内容反馈

yunyuyunyu

2012-04-23

页面非常清晰。是一本入门的好书。
yjhworm

2013-11-24

好书，android开发启蒙用书。
ShuSheng007

2013-12-29

确实比较初级，入门的话可以看一下
qq_15579131

2014-07-22

非常好，放到pad上看
maniacdown

2013-09-25

好书一本，看了一半了

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