Java Development

[gibli]

I want to build a module (extending Application) that will have no UI.

As a system + autostart module, will the activate/deactivate methods ever be called ?

Thanks

G 

[jobincantony · Accepted solution]

No.

By default, the system invokes activate() method when it brings the application to the foreground.

You are extending Application class and using the option System module, the application is working as a background application. So activate/ deactivate will not be invoked.

[gibli]

Thanks @jobincantony,

Which leads me to think that the class Application is not well designed since it is mixing concerns which are UI related.

I've not seen any samples of a System background module. Do you know of any that will help my understanding ?

From what I can guess, the Application subclass would look something like this:

public class BgApp extends Application implements Runnable
{    
    public static void main( String[] args )    
    {        
        BgApp theApp = new BgApp( args );        
        theApp.enterEventDispatcher(); // not sure if I need to call this    
    }    
    public BgApp( String[] args )    
    {        
        EventLogger.register( Constants.GUI, "bgapp", EventLogger.VIEWER_STRING );          
        new Thread( this ).start();    
    }     
    public void run()    
    {        
        // do stuff in the background    
    } 
} 

[jobincantony]

Could you please update your exact requirement.

1. Is this background module is a part of another application?

2. Is this "BgApp" is a simple background application ( no dependencies) which intended to monitor or do some background activities and Auto-start upon device start-up ?

No need to implement this Runnable, if you select SystemModule and Auto-startup option unless you have specific requirement to run your code in a seperate thread.

By the way if you select "Auto-startup " option will not make the application auto-start in SOFT reset. check

http://supportforums.blackberry.com/rim/board/message?board.id=java_dev&message.id=22727#M22727

If your application is not exiting completely you can implement the SystemListener inerface and override powerUp() method to detect the SOFT reset and do your start-up activity.