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Android Programming for Beginners

Android Programming for Beginners

By : John Horton, Paresh Mayani
4.1 (47)
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Android Programming for Beginners

Android Programming for Beginners

4.1 (47)
By: John Horton, Paresh Mayani

Overview of this book

Android is the most popular OS in the world. There are millions of devices accessing tens of thousands of applications. It is many people's entry point into the world of technology; it is an operating system for everyone. Despite this, the entry-fee to actually make Android applications is usually a computer science degree, or five years’ worth of Java experience. Android Programming for Beginners will be your companion to create Android applications from scratch—whether you’re looking to start your programming career, make an application for work, be reintroduced to mobile development, or are just looking to program for fun. We will introduce you to all the fundamental concepts of programming in an Android context, from the Java basics to working with the Android API. All examples 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, make location-aware apps with Google Maps integration, and store your user’s data with SQLite. In addition, you’ll see how to make your apps multilingual, capture images from a device’s camera, 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 (32 chapters)
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31
Index

Persisting data with SharedPreferences

In Android, there are a number of ways to make data persist. By persist, I mean that if the user quits the app, when they come back to it, their data is still available. The correct method to use is dependent upon the app and type of data.

In this book, we will look at three ways to make data persist. For saving our users' settings, we only need a really simple method. After all, we just need to know if they want sound and at which speed they want their animations.

Let's take a look at how we can make our apps save and reload variables to the internal storage of the device. We need to use the SharedPreferences class. SharedPreferences is a class that provides access to data that can be accessed and edited by all activities of an app. Let's look at how we can use it:

// A SharedPreferences for reading data
SharedPreferences prefs;

// A SharedPreferences.Editor for writing data
SharedPreferences.Editor editor; 

As with all objects, we need...

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Tech Concepts
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Programming languages
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Android Programming for Beginners
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