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

Basic classes app


The generals who will be using our app will need more than one Soldier object. In our app that we are about to build, we will instantiate and use multiple objects. We will also demonstrate using the dot operator on variables and methods to show that different objects have their very own instance variables.

You can get the completed code for this example in the code download. It is in the chapter 10/Basic Classes folder. However, it is most useful to read on to create your own working example.

Create a project with the Empty Activity template. Call the application Basic Classes. Now, we will create a new class called Soldier:

  1. Right-click the com.gamecodeschool.basicclasses (or whatever your package name is) folder in the project explorer window.

  2. Select New | Java Class in the Name: field.

  3. Type Soldier and click OK.

The new class is created for us with a code template, ready for us to put our implementation in, as demonstrated in the following screenshot:

Notice that Android Studio...