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

Marking a location on a map with an overlay


Above all else one of the best features of the Google Maps API is the ability to add our own content to maps by overlaying them with our own material.

In this final exercise we will display a map at a particular location and then overlay it with our own imagery. We will also see how to translate from geographical locations to screen positions.

Getting ready

This task is a continuation of the previous one, so make sure you have completed this first and have it open in Eclipse.

Here we have used the built in icon.png as our graphic but if you want to use your own, then add this first to a res/drawable folder, ideally as a PNG file.

How to do it...

  1. Mostly what is required here is a new class, which we can add as an inner class, but first we need to convert our MapView and MapController to class wide fields:

    MapView mapView;
    MapController mapControl;
  2. Now it is simply a matter of adding a new class to our MapActivity. It should be defined like this:

    class MyMapOverlay...