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Android Programming for Beginners

Android Programming for Beginners

By : John Horton
3.8 (13)
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Android Programming for Beginners

Android Programming for Beginners

3.8 (13)
By: John Horton

Overview of this book

Are you trying to start a career in programming, but haven't found the right way in? Do you have a great idea for an app, but don't know how to make it a reality? Or maybe you're just frustrated that in order to learn Android, you must know Java. If so, then this book is for you. This new and expanded second edition of Android Programming for Beginners will be your companion to create Android Pie applications from scratch. We will introduce you to all the fundamental concepts of programming in an Android context, from the basics of Java to working with the Android API. All examples use the up-to-date API classes, and 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 and store your user's data with SQLite. In addition, you'll see how to make your apps multilingual, draw to the screen with a finger, 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 (33 chapters)
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32
Index

Chapter 8. Java Decisions and Loops

We have just learned about variables. We know how we can change the values that they hold with expressions, but how can we take a course of action that's dependent upon the value of a variable?

We can certainly add a number of new messages to the number of previously unread messages, but how might we, for example, trigger an action within our app when the user has read all their messages?

The first problem is that we need a way to test the value of a variable and then respond when the value falls within a range of values or is a specific value.

Another problem that is common in programming of all sorts is that we need sections of our code to be executed a certain number of times (more than once or sometimes not at all) depending on the value of variables.

To solve the first problem, we will look at making decisions in Java with if, else, and switch. To solve the latter, we will look at loops in Java with while, dowhile, for, and...

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