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)

Exploring the palette and more anonymous classes – part 2

Now that we have seen how anonymous classes work, specifically with RadioGroup and RadioButton, we can continue to explore the palette and examine how anonymous classes work with some more UI widgets.

Switch

The Switch (not to be confused with the lowercase switch Java keyword) widget is just like a Button widget, except it has two possible states that can be read and responded to.

One obvious use for the Switch widget is to show or hide something. Remember that in our Java Meet UI app, in Chapter 12, The Stack, the Heap, and the Garbage Collector, we used a Button widget to show and hide a TextView widget.

Each time we hid or showed the TextView widget, we changed the text property on the Button widget to make it clear what would happen if it was clicked on again. What might have been more intuitive for the user, and more straightforward for us as programmers, would have been to use a Switch widget, as...