Book Image

BlackBerry Java Application Development

Book Image

BlackBerry Java Application Development

Overview of this book

BlackBerry Smartphone was once the domain of jet-setting business users with power suits. Now you can hardly go anywhere without seeing someone using a BlackBerry to check their messages or make a call. It's this kind of explosive growth that makes the BlackBerry ecosystem a great place to develop and market applications through the BlackBerry App World store—this book shows you how to do just that! This step-by-step guide gives you a hands-on experience of developing innovative Java applications for your BlackBerry. With the help of this book, you will learn to build your own applications to illustrate the platform, and the various capabilities that developers can use in their programs. It explores the powers of Blackberry and helps you develop professional and impressive Java applications. The book teaches how to write rich, interactive, and smart BlackBerry applications in Java. It expects the readers to know Java but not Java Mobile or the BlackBerry APIs. We will learn to build rich, interactive, and smart Java applications for the BlackBerry. The book will cover UI programming, data storage, programming network, and internet API apps. As we move on, we will learn more about the BlackBerry's device features, such as messaging, GPS, multimedia, contacts and calendar, and so on.This book also helps you build your own applications to illustrate the platform, and the various capabilities that developers can use in their programs.
Table of Contents (18 chapters)
BlackBerry Java Application Development
Credits
About the Author
Acknowledgement
About the Reviewers
Preface

Time for action - expanding TipCalcApplication


Now that you have the class created with some of the boilerplate code it's time to expand it and make the application actually do something.

  1. 1. You can start off by giving the static main function something to do. Replace the main method with the following code.

    /**
    * @param args
    */
    public static void main(String[] args) {
    // TODO Auto-generated method stub
    // Create a new instance of the application.
    TipCalcApplication theApp = new TipCalcApplication();
    // To make the application enter the event thread and start processing messages,
    // we invoke the enterEventDispatcher() method.
    theApp.enterEventDispatcher();
    }
    
  2. 2. Secondly, you need to add the TipCalcApplication constructor to the class so add the following code.

    private TipCalcApplication()
    {
    // Push the main screen instance onto the UI stack for rendering.
    pushScreen(new TipCalcMainScreen());
    }
    

What just happened?

The code that you just added takes the simple generated code that you got from...