Blackberry JAVA DEVELOPMENT ENVIRONMENT Podręcznik dla początkujących - Strona 22

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Getting started guide

Code sample: A BlackBerry device application that displays information on a

city the user selects

/**

Example:

* CityInfo.java

package com.rim.samples.cityinfo;

import net.rim.device.api.ui.*;

import net.rim.device.api.ui.component.*;

import net.rim.device.api.ui.container.*;

import net.rim.device.api.system.*;

import net.rim.device.api.i18n.*;

public class CityInfo extends UiApplication

{

public static void main(String[] args)

{

//Create a new instance of the BlackBerry

//and start the BlackBerry device application on the event thread.

CityInfo app = new CityInfo();

app.enterEventDispatcher();

}

public CityInfo()

{

//Display a new screen.

pushScreen(new CityInfoScreen());

}

//Create a new screen that extends MainScreen and provides

//behaviour similar to that of other BlackBerry device applications.

final class CityInfoScreen extends MainScreen

{

//declare variables for later use

private

InfoScreen

private ObjectChoiceField choiceField;

private int select;

public CityInfoScreen()

{

//Invoke the MainScreen constructor.

super();

//Add a screen title.

LabelField title = new LabelField("City Information Kiosk",

setTitle(title);

//Add a text label.

add(new RichTextField("Major U.S. Cities"));

//Add a drop-down list with the names of three cities as choice items:

_infoScreen;

LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);

device application