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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

Polymorphism

We already know that polymorphism means different forms. But what does it mean to us?

Note

Boiled down to its simplest form, it means the following:

Any subclass can be used as part of the code that uses the superclass.

This means that we can write code that is simpler and easier to understand, and easier to change.

Also, we can write code for the superclass and rely on the fact that no matter how many times it is subclassed, within certain parameters, the code will still work. Let's discuss an example.

Suppose we want to use polymorphism to help write a zoo management app. We will probably want to have a method, such as feed. We will probably want to pass a reference to the animal to be fed into the feed method. This might seem like we need to write a feed method for each and every type of Animal.

However, we can write polymorphic methods with polymorphic return types and arguments:

Animal feed(Animal animalToFeed){
   // Feed any animal here
   return animalToFeed;
}

The preceding...

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