[hijame]

When I hide my UIApplication (by press Red Phone Key or invoke requestBackground() ), I cannot catch the event when keypressed. I implemented KeyListener from MainScreen and it works fine when the Application is not in background mode, but not after I hide my App.
Any solutions for this ?. I'll appreciate any help.

[bemshaswing]

override this method in your application to catch the event.

[hijame]

Could you please explain it in detail? I overrided deactivate(), but I have no idea how implement it to catch event. My Application source code is below, it's pretty simple. Have I missed something ?

PHP Code:

package AppHello;

import net.rim.device.api.system.KeyListener;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Keypad;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.container.MainScreen;

public class HelloWorld extends UiApplication {
    private BackGroundApp backGroundApp;
    private HelloWorldScreen mScreen;
    private HelloWorld() {

        mScreen = new HelloWorldScreen();  
        pushScreen(mScreen);
    }
    
     
     }
    /**
     * @param args
     */
    public static void main(Stringxxx91;xxx93; args) {
        // TODO Auto-generated method stub
        HelloWorld app = new HelloWorld();
        app.enterEventDispatcher();
        
    }
    public void deactivate() {
        // TODO Auto-generated method stub
        super.deactivate();
    }

}
final class HelloWorldScreen extends MainScreen
{
    HelloWorldScreen()
    {
        setTitle(new LabelField("BBerry",LabelField.ELLIPSIS));
        add(new RichTextField("Config Screen",Field.NON_FOCUSABLE));
    }

    public void close() {
        // TODO Auto-generated method stub
        Dialog.alert("Bye");
        System.exit(0);
        super.close();
    }

    protected boolean keyDown(int arg0, int arg1) {
        // TODO Auto-generated method stub

        Dialog.alert(String.valueOf(Keypad.key(arg0)));
        System.out.println(String.valueOf(Keypad.key(arg0)));
        return super.keyDown(arg0, arg1);
    }

    protected boolean keyChar(char c, int status, int time) {
        // TODO Auto-generated method stub

        return super.keyChar(c, status, time);    
    }
    
} 


[bemshaswing]

well it depends on what you would want to do with it

public void deactivate() {
//You would 'catch' and do whatever you want right here
super.deactivate();
}

[hijame]

Well, I know I must catch events in that deactivate block, but im only beginner with Java and I really don't know how to 'catch' within a method? For example, if I want to print to Console output the key which user pressed in App Home Screen, then what should I write in 'deactivate()'. Could you provide me a sample ?

[Dougsg38p]

A key listener attached to the Screen is absolutely not going to "hear" any keys when the screen is not being displayed.

There is also a addKeyListener() method on the Application class - I have not tried this but looks like it is worth a try.

[hijame]

I've tried that already, the problem still exist. When the application is sent to background, not only the mainscreen is hiddden, also the main application is deactivated.
So I think adding a KeyListener() to the main app is not going to work.
Even I try to make a background thread which only 'hear' for the key events, It still not work when the app is minimized (ONLY when it's minimized).
Anyone knows why? Maybe the AppHomeScreen also has a listener and it intercept my app from catching the events ?

[hijame]

After debugging, I found out that my background thread is still running and listening for key pressed. But it only catch the key "Red Phone". When I press any other key, the focus will change to Phone App, that means the Phone App keeping my thread from listening to events ? And because the "Red Phone" key does not have any function in Phone App so my thread was able to catch it.
any ideas ?

[simon.hain]

a background app does not get any navigation events.

[hijame]

so is there any approach to this problem ? Or the Blackberry JDE is not sophisticated enough to make this happens ? It seems not simple as I thought. :(