Learning Java by Building Android Games: Learn Java and Android from scratch by building six exciting games , Second Edition

John Horton

€36.99

4.1 (11 Ratings)

Paperback Aug 2018 774 pages 2nd Edition

John Horton

€36.99

4.1 (11 Ratings)

Paperback Aug 2018 774 pages 2nd Edition

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Learning Java by Building Android Games

Chapter 2. Java: First Contact

In this chapter, we will make significant progress with the Sub' Hunter game even though this is the first lesson on Java. We will look in detail at exactly how Sub' Hunter will be played and the steps/flow that our completed code will need to take to implement it.

We will also learn about Java code comments for documenting the code, take a brief initial glimpse at methods to structure our code and an even briefer first glimpse at object-oriented programming that will begin to reveal the power of Java and the Android API

The auto-generated code we saw in the previous chapter will also be explained as we proceed and add more code too. Here is what you can expect to learn in this chapter:

Planning the Sub' Hunter game
Introduction to Java methods
Structuring Sub' Hunter with methods
Introduction to Object-Oriented Programming
Using Java Packages
Linking up the Sub' Hunter methods

First, let's do some planning.

Using Java packages

Packages are grouped collections of classes. If you look at the top of the code that we have written so far, you will see these lines of code.

import android.app.Activity;
import android.os.Bundle;

These lines of code make available the Activity and Bundle classes as well as their methods. Comment out the above two lines like this:

// import android.app.Activity;
// import android.os.Bundle;

Now look at your code and you will see errors in at least three places. The word Activity has an error because Activity is a class which Android Studio no longer is aware of in the following line:

public class SubHunter extends Activity {

The word onCreate also has an error because it is a method from the Activity class and the word Bundle has an error because it is a class which since we commented out the previous two lines Android is no longer aware of. This next line highlights where the errors are.

protected void onCreate(Bundle savedInstanceState) {

Uncomment the two lines of code...

Key benefits

Learn Java, Android, and object-oriented programming from scratch
Build games including Sub Hunter, Retro Pong, Bullet Hell, Classic Snake, and a 2D Scrolling Shooter
Create and design your own games, such as an open-world platform game

Description

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.

Who is this book for?

Learning Java by Building Android Games is for you if you are completely new to Java, Android, or game programming and want to make Android games. This book also acts as a refresher for those who already have experience of using Java on Android or any other platform without game development experience.

What you will learn

Set up a game development environment in Android Studio
Implement screen locking, screen rotation, pixel graphics, and play sound effects
Respond to a player's touch, and program intelligent enemies who challenge the player in different ways
Learn game development concepts, such as collision detection, animating sprite sheets, simple tracking and following, AI, parallax backgrounds, and particle explosions
Animate objects at 60 frames per second (FPS) and manage multiple independent objects using Object-Oriented Programming (OOP)
Understand the essentials of game programming, such as design patterns, object-oriented programming, Singleton, strategy, and entity-component patterns
Learn how to use the Android API, including Activity lifecycle, detecting version number, SoundPool API, Paint, Canvas, and Bitmap classes
Build a side-scrolling shooter and an open world 2D platformer using advanced OOP concepts and programming patterns

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Amazon verified reviews

Sand George Ionut Sep 14, 2019

good bok

Amazon Verified review

Sandra Porter Jun 18, 2019

I do know other programming languages like VB.NET but wanted to learn Java for a while and how to program Android devices. This book really is for beginners and you do not have any previous knowledge. As it says at the beginning of the book, if you do know some of the stuff, you'll just be quicker through the first few chapters. He explains everything in plain English and just brings in the technical terminology slowly so that you will be able to communicate with the the tech community. What I really like is that important subjects are explained from different angles. So even though you might not have understood something the first time round you probably will the second time around. You can download the code for every chapter which was very useful at the beginning.This edition is very much up to date.

Amazon Customer Dec 28, 2018

Great

Anon Oct 19, 2018

I had no experience in Android programing and felt the Google tutorials were not really teaching anything but copy and paste, seriously. John's book on the other hand explained many things that Google doesn't and at the same time it has been fun to make the games. His approach is very straight forward and he does a great job of explaining everything along the way. I never felt lost and never had to copy and paste code to just make something work. I would recommend this book to everyone. I am not yet an accomplished Android programmer but thanks to John I am on my way now.

janusz Jan 23, 2021

It was not too easy and not too hard, just right for someone to learn some new concepts.I learned something so nice!Good read.

Learning Java by Building Android Games: Learn Java and Android from scratch by building six exciting games , Second Edition

What do you get with Print?

Learning Java by Building Android Games

Chapter 2. Java: First Contact

Planning the Sub' Hunter game

Note

Introduction to Java methods

Structuring Sub' Hunter with methods

Introduction to Object Oriented Programming

Using Java packages

Linking up our methods

Note

Summary

Page 1 of 8

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Learning Java by Building Android Games: Learn Java and Android from scratch by building six exciting games , Second Edition

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