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inside custom component

Java Development

Create a Background Application

by Retired ‎02-16-2010 03:23 PM - edited ‎09-16-2010 02:52 PM (5,662 Views)



This article applies to the BlackBerry® wireless devices based on Java™.




Some applications may not require a graphical user interface (GUI), but simply perform background processing for the user. The sample application below can initiate when a user selects it from the ribbon; however, no change appears on the screen and the user can select another icon from the ribbon and continue to use the BlackBerry device as they normally would. Selecting the same icon a second time cannot spawn a second instance of this sample, as the device is aware that the application has already been launched and will not create a second instance of it. The following sample will run indefinitely until the device is shut down:



* GUILessApplication
* A sample application that appears on the ribbon
* but does not have any user interface.

package com.samples.guiLessApplication;

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.*;

public final class GUILessApp extends Application
private BackGroundApp backGroundApp;
public static void main(String[] args)
GUILessApp theApp = new GUILessApp();

public GUILessApp()
//Creates and starts a new BackGroundApp thread.

backGroundApp = new BackGroundApp();

//The thread that will run in the background.
private class BackGroundApp extends Thread
boolean stopThread = false;
public synchronized void stop()
stopThread = true;

public void run()
while (!stopThread)
//You would perform your processing here.
//This sample just prints out a line
//to the BlackBerry JDE Output Window
System.out.println("Application is running");

//Sleep for 5 seconds to prevent the
//application from running out of control
catch (Exception e)
//Exception handling would go here.
//Stop the thread on exit.
protected void onExit()



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