Book Image

Android 3.0 Application Development Cookbook

By : Kyle Merrifield Mew
Book Image

Android 3.0 Application Development Cookbook

By: Kyle Merrifield Mew

Overview of this book

<p>Android is a mobile operating system that runs on a staggering number of smartphones and tablets. Android offers developers the ability to build extremely rich and innovative applications written using the Java programming language. Among the number of books that have been published on the topic, what&rsquo;s missing is a thoroughly practical, hands-on book that takes you straight to getting your job done without boring you with too much theory.<br /><br />Android 3.0 Application Development Cookbook will take you straight to the information you need to get your applications up and running. This book is written to provide you with the shortest possible route between an idea and a working application. <br /><br />Work through the book from start to finish to become an Android expert, or use it as a reference book by applying recipes directly to your project.<br /><br />This book covers every aspect of mobile app development, starting with major application components and screen layout and design, before moving on to how to manage sensors such as internal gyroscopes and near field communications. Towards the end, it delves into smartphone multimedia capabilities as well as graphics and animation, web access, and GPS. <br /><br />Whether you are writing your first app or your hundredth, this is a book that you will come back to time and time again, with its many tips and tricks on the rich features of Android 3.</p>
Table of Contents (18 chapters)
Android 3.0 Application Development Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Displaying an alert dialog


AlertDialog is the most common form of built-in dialog box on the Android platform, and probably the most useful as well. It can be used to present the user with a variety of just activity-specific information in the form of a temporary window that partially obscures the screen, and more often than not allows the user to respond to that information by providing one or more clickable buttons or selectable items:

Here we will see how to generate such windows and how to provide them with components that will notify the user and also allow them to take an action.

Getting ready

Android makes the production of an AlertDialog box remarkably simple. To follow the instructions in this task simply start up a new Android project in Eclipse.

There is no need to add or identify any new widgets but you may want to remove the default text view the wizard includes in new projects.

How to do it...

  1. We need some way to refer to our dialog box, so open the Java activity file and declare...