Book Image

Learning Java by Building Android Games - Second Edition

By : John Horton
Book Image

Learning Java by Building Android Games - Second Edition

By: John Horton

Overview of this book

Android is one of the most popular mobile operating systems presently. It uses the most popular programming language, Java, as the primary language for building apps of all types. However, this book is unlike other Android books in that it doesn’t assume that you already have Java proficiency. This new and expanded second edition of Learning Java by Building Android Games shows you how to start building Android games from scratch. The difficulty level will grow steadily as you explore key Java topics, such as variables, loops, methods, object oriented programming, and design patterns, including code and examples that are written for Java 9 and Android P. At each stage, you will put what you’ve learned into practice by developing a game. You will build games such as Minesweeper, Retro Pong, Bullet Hell, and Classic Snake and Scrolling Shooter games. In the later chapters, you will create a time-trial, open-world platform game. By the end of the book, you will not only have grasped Java and Android but will also have developed six cool games for the Android platform.
Table of Contents (30 chapters)
Learning Java by Building Android Games Second Edition
Contributors
Preface
Index

Structuring Sub' Hunter with methods


As we add the method definitions to the code it shouldn't come as much surprise where each of the methods will go. The draw method will go after the comment about … do all the drawing… and so on.

Add the newGame method definition after the appropriate comment as shown next.

/*
   This code will execute when a new
   game needs to be started. It will
   happen when the app is first started
   and after the player wins a game.
 */
void newGame(){

}

Add the draw method definition after the appropriate comment as highlighted.

/*
   Here we will do all the drawing.
   The grid lines, the HUD,
   the touch indicator and the
   "BOOM" when a sub' is hit
*/
void draw() {

}

Add the onTouchEvent definition after this comment.

/*
   This part of the code will
   handle detecting that the player
   has tapped the screen
 */
@Override
public boolean onTouchEvent(MotionEvent motionEvent) {

}

You have probably noticed that the onTouchEvent method is another overridden...