Book Image

Android Programming with Kotlin for Beginners

By : John Horton
5 (1)
Book Image

Android Programming with Kotlin for Beginners

5 (1)
By: John Horton

Overview of this book

Android is the most popular mobile operating system in the world and Kotlin has been declared by Google as a first-class programming language to build Android apps. With the imminent arrival of the most anticipated Android update, Android 10 (Q), this book gets you started building apps compatible with the latest version of Android. It adopts a project-style approach, where we focus on teaching the fundamentals of Android app development and the essentials of Kotlin by building three real-world apps and more than a dozen mini-apps. The book begins by giving you a strong grasp of how Kotlin and Android work together before gradually moving onto exploring the various Android APIs for building stunning apps for Android with ease. You will learn to make your apps more presentable using different layouts. You will dive deep into Kotlin programming concepts such as variables, functions, data structures, Object-Oriented code, and how to connect your Kotlin code to the UI. You will learn to add multilingual text so that your app is accessible to millions of more potential users. You will learn how animation, graphics, and sound effects work and are implemented in your Android app. By the end of the book, you will have sound knowledge about significant Kotlin programming concepts and start building your own fully featured Android apps.
Table of Contents (33 chapters)
Android Programming with Kotlin for Beginners
Contributors
Preface
Index

Implementing a particle system effect


A particle system is a system that controls particles. In our case, ParticleSystem is a class we will write that will spawn instances (lots of instances) of the Particle class (also a class we will write) that together will create a simple explosion-like effect.

Here is a screenshot of some particles controlled by a particle system as it may appear by the end of this chapter:

Just for clarification, each of the colored squares is an instance of the Particle class, and all the Particle instances are controlled and held by the ParticleSystem class. In addition, the user will create multiple (hundreds) of ParticleSystem instances by drawing with their finger. The particle systems will appear as dots or blocks until the user taps the Pause button and they come to life. We will examine the code closely enough that you will be able to amend in code the size, color, speed, and quantities of Particle and ParticleSystem instances.

Note

It is left as an exercise for...