Beginning Android Games - Zechner - Apress (2011).pdf - TUTORIALE - Android_NEW

488

CHAPTER 9: Super Jumper: A 2D OpenGL ES Game

Get started with game apps development

for the Android platform

Beginning

Android Games

Mario Zechner

488

CHAPTER 9: Super Jumper: A 2D OpenGL ES Game

For your convenience Apress has placed some of the front

matter material after the index. Please use the Bookmarks

and Contents at a Glance links to access them.

Contents at a Glance

Contents .............................................................................................................. v

About the Author............................................................................................... xii

About the Technical Reviewer ......................................................................... xiii

Acknowledgments ............................................................................................ xiv

Introduction ....................................................................................................... xv

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Chapter 1: Android, the New Kid on the Block ................................................ 1

Chapter 2: First Steps with the Android SDK................................................. 25

■

Chapter 3: Game Development 101 ............................................................... 51

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Chapter 4: Android for Game Developers .................................................... 103

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Chapter 5: An Android Game Development Framework .............................. 185

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Chapter 6: Mr. Nom Invades Android .......................................................... 229

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Chapter 7: OpenGL ES: A Gentle Introduction .............................................. 269

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Chapter 8: 2D Game Programming Tricks ................................................... 351

■

Chapter 9: Super Jumper: A 2D OpenGL ES Game ....................................... 429

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Chapter 10: OpenGL ES: Going 3D................................................................ 489

■

Chapter 11: 3D Programming Tricks ........................................................... 525

■

Chapter 12: Droid Invaders: the Grand Finale ............................................. 577

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Chapter 13: Publishing Your Game.............................................................. 625

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Chapter 14: What’s Next? ............................................................................ 637

Index ............................................................................................................... 641

■

Introduction

Hi there, and welcome to the world of Android game development. My name is Mario; I’ll be your

guide for the next fourteen chapters. You came here to learn about game development on

Android, and I hope to be the person who enables you to realize your ideas.

Together we’ll cover quite a range of materials and topics: Android basics, audio and

graphics programming, a little math and physics, and a scary thing called OpenGL ES. Based on

all this knowledge we’ll develop three different games, one even being 3D.

Game programming can be easy if you know what you’re doing. Therefore I’ve tried to

present the material in a way that not only gives you helpful code snippets to reuse, but actually

shows you the big picture of game development. Understanding the underlying principles is the

key to tackling ever more complex game ideas. You’ll not only be able to write games similar to

the ones developed over the course of this book, but you’ll also be equipped with enough

knowledge to go to the Web or the bookstore and take on new areas of game development on

your own.

A Word About the Target Audience

This book is aimed first and foremost at complete beginners in game programming. You don’t

need any prior knowledge on the subject matter; I’ll walk you through all the basics. However, I

need to assume a little knowledge on your end about Java. If you feel rusty on the matter, I’d

suggest refreshing your memory by reading the online edition of Thinking in Java , by Bruce Eckel

(Prentice Hall, 2006), an excellent introductory text on the programming language. Other than

that, there are no other requirements. No prior exposure to Android or Eclipse is necessary!

This book is also aimed at the intermediate-level game programmer that wants to get her

hands dirty with Android. While some of the material may be old news for you, there are still a lot

of tips and hints contained that should make reading this book worthwhile. Android is a strange

beast at times, and this book should be considered your battle guide.

How This Book Is Organized

This book takes an iterative approach in that we’ll slowly but surely work our way from the

absolute basics to the esoteric heights of hardware-accelerated game programming goodness.

Over the course of the chapters, we’ll build up a reusable code base, so I’d suggest going through

the chapters in sequence. More experienced readers can of course skip certain sections they feel

confident with. Just make sure to read through the code listings of sections you skim over a little,

so you will understand how the classes and interfaces are used in subsequent, more advanced

sections.

■ INTRODUCTION

Getting the Source Code

This book is fully self-contained; all the code necessary to run the examples and games is

included. However, copying the listings from the book to Eclipse is error prone, and games do not

consist of code alone, but also have assets that you can’t easily copy out of the book. Also, the

process of copying code from the book's text to Eclipse can introduce errors. Robert (the book’s

technical reviewer) and I took great care to ensure that all the listings in this book are error free,

but the gremlins are always hard at work.

To make this a smooth ride, I created a Google Code project that offers you the following:

•

The complete source code and assets, licensed under the GPL version 3,

available from the project’s Subversion repository.

•

A quickstart guide showing you how to import the projects into Eclipse in

textual form, and a video demonstration for the same.

•

An issue tracker that allows you to report any errors you find, either in the

book itself or in the code accompanying the book. Once you file an issue in

the issue tracker, I can incorporate any fixes in the Subversion repository.

This way you’ll always have an up-to-date, (hopefully) error-free version of

this book’s code from which other readers can benefit as well.

A discussion group that is free for everybody to join and discuss the

contents of the book. I’ll be on there as well of course.

For each chapter that contains code, there’s an equivalent Eclipse project in the Subversion

repository. The projects do not depend on each other, as we’ll iteratively improve some of the

framework classes over the course of the book. Each project therefore stands on its own. The code

for both Chapters 5 and 6 is contained in the ch06-mrnom project.

The Google Code project can be found at http://code.google.com/p/beginning-android-

games .

•

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