open new form from a current screen

Hi, I'm new to blackberry.

I have 2 files: screen1.java and screen2.java.

in screen1.java:

 
import net.rim.device.api.ui.UiApplication;import net.rim.device.api.ui.component.LabelField;import net.rim.device.api.ui.container.MainScreen;

public class Screen1 extends UiApplication{

    public static void main(String[] args)    {        Screen1  screen1 = new Screen1();        screen1.enterEventDispatcher();    }    public Screen1()    {        pushScreen(new Screen1Screen());        Screen2 screen2 = new Screen2();        screen2.enterEventDispatcher();    }}final class Screen1Screen extends MainScreen{

    public Screen1Screen()    {        super();         setTitle(new LabelField("Screen1"));    }

}

in screen2.java

import net.rim.device.api.ui.UiApplication;import net.rim.device.api.ui.component.LabelField;import net.rim.device.api.ui.container.MainScreen;

public class Screen2 extends UiApplication{

    public Screen2()    {        pushScreen(new Screen2Screen());    }}final class Screen2Screen extends MainScreen{

    public Screen2Screen()    {        super();         setTitle(new LabelField("Screen2"));    }

}

I get the exception error: Application is already running in this process.

What I am doing wrong? I want to open screen1 screen2.

"I'm new to blackberry." - Welcome aboard

To answer your question, the problem is that you seem to think it is the instruction

"enterEventDispatcher();"

that allows the new screens to be pushed.  This is not the case, the enterEventDispatcher is just a bit of magic that you have code in the application to get going and you code only once.  You will better understand the latter, for the moment, just code and continue.

I've updated your code in such a way that I think will work (but it is not tested and may not even compile).  I've also renamed things in a way that I hope will clearly be their function.  This will display the screen 1, and when you enter the screen 1, it will take you to the screen 2.  I pasted it below.  It will be useful.

As a beginner, I recommend that you spend some time familiarizing yourself with the resources available of

www.BlackBerry.com/Developers

and this sticky thread

http://supportforums.BlackBerry.com/Rim/Board/message?board.ID=java_dev&thread.ID=13264

import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.system.Characters;

public class StartUp extends UiApplication {

    public static void main(String[] args) {
        StartUp theApp = new StartUp();
        theApp.enterEventDispatcher();
    }

    public StartUp() {
        this.pushScreen((new Screen1Screen());
    }

}

final class Screen1Screen extends MainScreen
{
    public Screen1Screen()
    {
        super();
        setTitle(new LabelField("Screen1"));
    }

    protected boolean keyChar(char character, int status, int time) {
        switch (character) {
            case Characters.ENTER:
                this.pushScreen((new Screen2Screen());
                return true;
            default:
                return super.keyChar(character, status, time);
        }

    }

}
final class Screen2Screen extends MainScreen
{

    public Screen2Screen()
    {
        super();
        setTitle(new LabelField("Screen2"));
    }

}

Tags: BlackBerry Developers

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