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

Looking ahead at the Live Drawing app


As this app is more in-depth and needs to respond in real time, it is necessary to use a slightly more in-depth structure. At first, this may seem like a complication, but in the long run, it can even make our code simpler and easier to understand.

We will have four classes in the Live Drawing app:

  • LiveDrawingActivity: The Activity class provided by the Android API is the class that interacts with the operating system. We have already seen how the OS interacts with onCreate when the player clicks the app icon to start an app. Rather than have a class called MainActivity that does everything, we will have an Activity-based class that just handles the startup and shutdown of our app, as well as giving some assistance with initialization by getting the screen resolution. It makes sense that this class will be of the Activity type. However, as you will soon see, we will delegate interacting with touches to another class, the same class that will also handle...