Book Image

Android Programming for Beginners - Third Edition

By : John Horton
Book Image

Android Programming for Beginners - Third Edition

By: John Horton

Overview of this book

Do you want to make a career in programming but don’t know where to start? Do you have a great idea for an app but don't know how to make it a reality? Or are you worried that you’ll have to learn Java programming to become an Android developer? Look no further! This new and expanded third edition of Android Programming for Beginners will be your guide to creating Android applications from scratch. The book starts by introducing you to all the fundamental concepts of programming in an Android context, from the basics of Java to working with the Android API. You’ll learn with the help of examples that use up-to-date API classes and are created within Android Studio, the official Android development environment that helps supercharge your mobile application development process. After a crash course on the key programming concepts, you’ll explore Android programming and get to grips with creating applications with a professional-standard UI using fragments and storing user data with SQLite. This Android Java book also shows you how you can make your apps multilingual, draw on the screen with a finger, and work with graphics, sound, and animations. By the end of this Android programming book, you'll be ready to start building your own custom applications in Android and Java.
Table of Contents (30 chapters)

Backing up user data in Note to Self

So, with our newfound insight into exceptions, let's modify our Note to Self code, and then we can be introduced to the JSONObject and JSONException classes.

First, let's make some minor modifications to our Note class. Add some more members that will act as the key in a key-value pair for each aspect of our Note class:

private static final String JSON_TITLE = "title";
private static final String JSON_DESCRIPTION = "description";
private static final String JSON_IDEA = "idea";
private static final String JSON_TODO = "todo";
private static final String JSON_IMPORTANT = "important";

Now add a constructor and an empty default constructor that receives JSONObject and throws JSONException. The body of the constructor initializes each of the members that defines the properties of a single Note object by calling the getString or getBoolean method of JSONObject, passing in the key as an...