Book Image

Android Programming for Beginners - Third Edition

By : John Horton
Book Image

Android Programming for Beginners - Third Edition

By: John Horton

Overview of this book

Do you want to make a career in programming but don’t know where to start? Do you have a great idea for an app but don't know how to make it a reality? Or are you worried that you’ll have to learn Java programming to become an Android developer? Look no further! This new and expanded third edition of Android Programming for Beginners will be your guide to creating Android applications from scratch. The book starts by introducing you to all the fundamental concepts of programming in an Android context, from the basics of Java to working with the Android API. You’ll learn with the help of examples that use up-to-date API classes and are created within Android Studio, the official Android development environment that helps supercharge your mobile application development process. After a crash course on the key programming concepts, you’ll explore Android programming and get to grips with creating applications with a professional-standard UI using fragments and storing user data with SQLite. This Android Java book also shows you how you can make your apps multilingual, draw on the screen with a finger, and work with graphics, sound, and animations. By the end of this Android programming book, you'll be ready to start building your own custom applications in Android and Java.
Table of Contents (30 chapters)

Switching to make decisions

We have seen the vast and virtually limitless possibilities of combining the Java operators with if and else statements. But sometimes a decision in Java can be better made in other ways.

When we are deciding based on a clear list of possibilities that don't involve complex combinations, switch is usually the way to go.

We start a switch decision like this:

switch(argument){
}

In the previous example, argument could be an expression or a variable. Within the curly braces, {}, we can make decisions based on the argument with case and break elements:

case x:
   // code for case x
   break;
case y:
   // code for case y
   break;

You can see in the previous example that each case states a possible result and each break denotes the end of that case, as well as the point at which no further case statements should be evaluated.

The first break encountered breaks out of the...