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)

Running the Widget Exploration app

Run the app in the usual way, making sure that you use your tablet emulator.

Tip

The Android emulators can be rotated into landscape mode by pressing the Ctrl + F11 keyboard combination on a PC or Ctrl + fn+ F11 on a Mac.

Here is the entire app, including the WebView widget, which is now visible:

Figure 13.12 – Final app layout

Try checking the radio buttons to see the time zone change on the clock. In the following diagram, I have Photoshopped a few cropped screenshots together to show that the time changes when a new time zone is selected:

Figure 13.13 – Time zones

To test out the CAPTURE button, the editable text, and the switch, follow these steps (we have also listed them in the adjoining screenshot):

  1. Enter different values into the EditText widget (which is on the left).
  2. Click on the CAPTURE button.
  3. Make sure that the Switch widget is on.
  4. View the message...