Book Image

Android Programming for Beginners - Second Edition

By : John Horton
Book Image

Android Programming for Beginners - Second Edition

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 (35 chapters)
Android Programming for Beginners - Second Edition
Contributors
Preface
Other Books You May Enjoy
Index

Summary


We have at last written our first class. We have seen that we can implement a class in a Java file of the same name as the class. The class itself doesn't do anything until we instantiate an object/instance of the class. Once we have an instance of the class, we can use its variables and methods. As we proved in the Basic Classes app, each and every instance of a class has its own distinct variables. Just as when you buy a car made in a factory, you get your very own steering wheel, Sat Nav, and go-faster stripes.

All this information will raise more questions. OOP is like that. So, let's try and consolidate all of this class stuff by taking another look at variables and encapsulation, polymorphism, and inheritance in action in the next chapter. We can then go further with classes and explore topics such as static classes (like Log and Toast), as well as the more advanced concepts of abstract classes and interfaces.