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 - collecting information with custom buttons on a dialog


  1. 1. Again you will add another menu item to the FieldSamplerScreen class to display this form of dialog.

    MenuItem _ButtonChoiceDialogAction = new MenuItem("Demo Button Choice Dialog", 10000, 100)
    {
    public void run()
    {
    Object[] _choices = {"Choice1","Choice2","Choice3"};
    int[] _values = {0,1,2};
    int retValue = Dialog.ask("Please select a value", _choices,_values, 2);
    Dialog.alert("You selected "+_choices[retValue].toString());
    }
    };
    
  2. 2. Also, again, you need to add the following code to display the menu item when it is shown. Add this code to the makeMenu method.

    m.add(_ButtonChoiceDialogAction);
    
    

What just happened?

This code isn't quite as easy as using a common dialog, but getting the power to display your own values in the buttons being shown to the user is worth the effort. The objects in the _choices list don't necessarily need to be a type of String either. Much like the ObjectChoiceField, the class will use the toString...