Book Image

Android Programming for Beginners

By : John Horton, Paresh Mayani
Book Image

Android Programming for Beginners

By: John Horton, Paresh Mayani

Overview of this book

Android is the most popular OS in the world. There are millions of devices accessing tens of thousands of applications. It is many people's entry point into the world of technology; it is an operating system for everyone. Despite this, the entry-fee to actually make Android applications is usually a computer science degree, or five years’ worth of Java experience. Android Programming for Beginners will be your companion to create Android applications from scratch—whether you’re looking to start your programming career, make an application for work, be reintroduced to mobile development, or are just looking to program for fun. We will introduce you to all the fundamental concepts of programming in an Android context, from the Java basics to working with the Android API. All examples are created from within Android Studio, the official Android development environment that helps supercharge your application development process. After this crash-course, we’ll dive deeper into Android programming and you’ll learn how to create applications with a professional-standard UI through fragments, make location-aware apps with Google Maps integration, and store your user’s data with SQLite. In addition, you’ll see how to make your apps multilingual, capture images from a device’s camera, and work with graphics, sound, and animations too. By the end of this book, you’ll be ready to start building your own custom applications in Android and Java.
Table of Contents (37 chapters)
Android Programming for Beginners
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Taking a look at the code for a class


Let's say we are making an app for the military. It is designed for use by senior officers to micromanage their troops in the battle. Among others, we would probably need a class to represent a soldier.

The class implementation

Here is real code for our hypothetical class. We call it a class implementation. Because the class is called Soldier, if we implement this for real, we would do so in a file called Soldier.java:

public class Soldier {
  
  // Member variables
  int health;
  String soldierType;

  // Method of the class
  void shootEnemy(){
    // bang bang
  }
  
}

The code snippet in the preceding example is the implementation for a class called Soldier. There are two member variables or fields, an int variable called health and a String variable called soldierType.

There is also a method called shootEnemy. The method has no parameters and a void return type, but class methods can be of any shape or size as we discussed in Chapter 8, Coding in Java...