Book Image

Learning Java by Building Android Games - Third Edition

By : John Horton
5 (1)
Book Image

Learning Java by Building Android Games - Third Edition

5 (1)
By: John Horton

Overview of this book

Android is one of the most popular mobile operating systems today. It uses the most popular programming language, Java, as one of the primary languages for building apps of all types. Unlike most other Android books, this book doesn’t assume that you have any prior knowledge of Java programming, instead helps you get started with building Android games as a beginner. This new, improved, and updated third edition of Learning Java by Building Android Games helps you to build Android games from scratch. Once you've got to grips with the fundamentals, the difficulty level increases steadily as you explore key Java topics, such as variables, loops, methods, object-oriented programming (OOP), and design patterns while working with up-to-date code and supporting examples. At each stage, you'll be able to test your understanding by implementing the concepts that you’ve learned to develop a game. Toward the end, you’ll build games such as Sub Hunter, Retro Pong, Bullet Hell, Classic Snake, and Scrolling Shooter. By the end of this Java book, you'll not only have a solid understanding of Java and Android basics but will also have developed five cool games for the Android platform.
Table of Contents (24 chapters)

Running the game

Now you can run the game, tap on the screen, tap the play/pause button, and then the ParticleSystem class will burst into action:

Figure 19.5 – Running the game

Quite spectacular for half an hour's work! In fact, you will probably want to reduce the number of particles to fewer than 100, perhaps make them all white, and maybe reduce their size as well. All these things you can easily do by looking at the ParticleSystem class and its comments.


The screenshot of the particle explosion at the start of the previous chapter was with fewer, smaller, and just white particles.

Delete this temporary code from the onTouchEvent method of the GameEngine class:

// This is temporary code to emit a particle system
            new PointF(500,500));

Soon, we will spawn our particle system from the physics engine when one of our lasers hits...