Exercise

Write an application for the BlackBerry® device that uses BlackBerry user interface (UI) components, such as drop-down lists.

Objectives

• Discover how to use the IDE.
• Discover how a BlackBerry application is organized.
• Discover some of the basics of the BlackBerry user interface APIs.

Setup

 

1. Extract CityInfo_Incomplete.zip
2. In the IDE, open the cityinfo.jdw workspace
3. Open the CityInfo.java source

Tasks

1. In the CityInfoScreen constructor, add code to display a drop-down list with the following options: “Los Angeles”, “Chicago,” and “NewYork.”
2. Add a More Info menu item that displays the InfoScreen.
3. In the InfoScreen inner class, add code to display fields for population, state, and sight-seeing information.
4. Add code to display information depending on the city that the user selected. (Tip: use the select variable that has already been defined).

Check Your Work

From CityInfo_Complete.zip

Review

In this exercise, you discovered the following things:

• How to use an ObjectChoiceField to create a drop-down list
• How to create custom menu items
• How to add text to fields depending on a user selection