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)

Chapter 15: Arrays, Maps, and Random Numbers

In this chapter, we will learn about Java arrays, which allow us to manipulate a potentially huge amount of data in an organized and efficient manner. We will also use a close Java relation to arrays, ArrayList, and look at the differences between them.

Once we are comfortable handling substantial amounts of data, we will see what the Android API has to offer to help us easily connect our newfound data-handling skills to the user interface without breaking a sweat.

The topics in this chapter include the following:

  • The Random class
  • Handling data with arrays
  • Arrays mini-app
  • Dynamic arrays including a mini-app
  • Multidimensional arrays including a mini-app
  • The ArrayList class
  • The enhanced for loop
  • The Java HashMap

First, let's learn about the Random class.