4. Tappy Defender – Going Home | Android Game Programming By Example

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Android Game Programming By Example

By : John Horton

4.4 (9)

Android Game Programming By Example

4.4 (9)

By: John Horton

Overview of this book

The book is best suited for existing Android or Java programmers who want to adapt their skills to make exciting Android games. The book is also for determined readers who might have no Android, game programming or even Java experience, but a reasonable understanding of object oriented programming knowledge is assumed.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Player 1 UP

1. Player 1 UP

A closer look at the games

Setting up your development environment

Summary

2. Tappy Defender – First Step

2. Tappy Defender – First Step

Planning the first game

Building the home screen

Coding the game loop

The PlayerShip object

Drawing the scene

Deploying the game

Summary

3. Tappy Defender – Taking Flight

3. Tappy Defender – Taking Flight

Controlling the spaceship

Building the enemies

The thrill of flight – scrolling the background

Things that go bump – collision detection

Summary

4. Tappy Defender – Going Home

4. Tappy Defender – Going Home

Displaying a HUD

Implementing the rules

Ending the game

Adding sound FX

Adding persistence

Iteration

The finished game

Summary

5. Platformer – Upgrading the Game Engine

5. Platformer – Upgrading the Game Engine

The game

Upgrading the game engine

Summary

6. Platformer – Bob, Beeps, and Bumps

6. Platformer – Bob, Beeps, and Bumps

The SoundManager class

Introducing Bob

Multiphase collision detection

Player input

Animating Bob

Summary

7. Platformer – Guns, Life, Money, and the Enemy

7. Platformer – Guns, Life, Money, and the Enemy

Ready aim fire

Summary

8. Platformer – Putting It All Together

8. Platformer – Putting It All Together

Bullet collision detection

Adding some fire tiles

Eye candy

Summary

9. Asteroids at 60 FPS with OpenGL ES 2

9. Asteroids at 60 FPS with OpenGL ES 2

Asteroids simulator

Introducing OpenGL ES 2

Preparing OpenGL ES 2

Building an OpenGL-friendly, GameObject super class

The spaceship

Drawing at 60 + FPS

Summary

10. Move and Draw with OpenGL ES 2

10. Move and Draw with OpenGL ES 2

Drawing a static game border

Twinkling stars

Bringing the spaceship to life

Rapid fire bullets

Reusing existing classes

Drawing and moving the asteroids

Scores and the HUD

Summary

11. Things That Go Bump – Part II

11. Things That Go Bump – Part II

Planning for collision detection

Performing the checks

Precise collision detection with the border

Precise collision detection with an asteroid

Finishing touches

Summary

Index

Index

Customer Reviews

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Ending the game

If the game is not ended, the game is playing, and if the player has just died or won, the game is ended. We need to know when the game is ended and when it is playing. Let's make a new member variable gameEnded and declare it after the TDView class declaration:

private boolean gameEnded;

Now, we can initialize gameEnded in the startGame method. Enter this code as the very last line in the method.

gameEnded = false;

Now, we can finish the last few lines of our game rules logic, but wrap them in a test to see if the game has ended or not. Add the following code to conditionally update our game rules logic, right at the end of the TDView class's update method:

if(!gameEnded) {
            //subtract distance to home planet based on current speed
            distanceRemaining -= player.getSpeed();

            //How long has the player been flying
            timeTaken = System.currentTimeMillis() - timeStarted;
}

Our HUD will now have accurate data to keep the player informed of...

Visually different images

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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