Java Development

[zapragartiast]

Hello for all Blackberry Developer..

But I need some advice about my code when I building a splash screen for my blackberry apps.

I was create 2 files, namely splash.java and splashscreen.java but they tell me an error when I will compile them.

this is my code

// this is on splash.java

package splash;

import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.container.MainScreen;
/**
 * This class extends the UiApplication class, providing a
 * graphical user interface.
 */
public class Splash extends UiApplication
{
	/**
     * Entry point for application
     * @param args Command line arguments (not used)
     */ 
    public static void main(String[] args)
    {
        // Create a new instance of the application and make the currently
        // running thread the application's event dispatch thread.
        Splash theApp = new Splash();       
        theApp.enterEventDispatcher();
    }
    

    /**
     * Creates a new Splash object
     */
    public Splash()
    {        
        // Push a screen onto the UI stack for rendering.
        pushScreen(SplashScreen);
    }    
}

this is on splashscreen.java

package splash;

import net.rim.device.api.system.Bitmap;
import net.rim.device.api.system.Characters;
import net.rim.device.api.ui.*;
import net.rim.device.api.ui.component.*;
import net.rim.device.api.ui.container.*;
import java.util.*;

/**
 * A class extending the MainScreen class, which provides default standard
 * behavior for BlackBerry GUI applications.
 */
public final class SplashScreen extends MainScreen
{
	private MainScreen next;
	private UiApplication application;
	private Timer timer = new Timer();
	private static final Bitmap _bitmap = Bitmap.getBitmapResource("image.png");
	
    public SplashScreen(UiApplication ui, MainScreen next)
    {        
        super(Field.USE_ALL_HEIGHT | Field.FIELD_LEFT);
        this.application = ui;
        this.next = next;
        this.add(new BitmapField(_bitmap));
        SplashScreenListener listener = new SplashScreenListener(this);
        this.addKeyListener(listener);
        timer.schedule(new CountDown(), 5000);
        application.pushScreen(this);
    }
    
    public void dismiss() {
    	timer.cancel();
    	application.popScreen(this);
    	application.popScreen(next);
    }
    
    private class CountDown extends TimerTask {
    	public void run(){
    		DismissThread dThread = new DismissThread();
    		application.invokeLater(dThread);
    	}
    }
    
    private class DismissThread implements Runnable {
    	public void run(){
    		dismiss();
    	}
    }
    
    protected boolean navigationClick(int status, int time){
    	dismiss();
    	return true;
    }
    
    protected boolean navigationUnclick(int status, int time){
    	return false;
    }
    
    protected boolean navigationMovement(int dx, int dy, int status, int time){
    	return false;
    }
    
    public static class SplashScreenListener implements KeyListener{
    	private SplashScreen screen;
    	public boolean keyChar(char key, int status, int time){
    		boolean retval = false;
    		switch(key){
    		case Characters.CONTROL_MENU:
    		case Characters.ESCAPE:
    		screen.dismiss();
    		retval = true;
    		break;
    		}
    		return retval;
    	}
    public boolean keyDown(int keycode, int time){
    	return false;
    }
    
    public boolean keyRepeat(int keycode, int time){
    	return false;
    }
    
    public boolean keyStatus(int keycode, int time){
    	return false;
    }
    
    public boolean keyUp (int keycode, int time){
    	return false;
    }
    
    public SplashScreenListener(SplashScreen splash){
    	screen = splash;
    }
    }
    
}

I got the error there.. Please give me some advice to fix them. thank you...

[Shraddha]

why are you pushing screen in the constructor?

Another thing, i dont see a new SplashScreen created, that is new operator is not used.

What is the compiler error that you get? Please elaborate the error and we can help.

[zapragartiast]

First I got error on the KeyListener. KeyListener cannot be resolved to a type.
Second, SplashScreen cannot be resolved to a variable.
Third, The method addKeyListener(KeyListener) in the type Screen is not applicable for the arguments (SplashScreen.SplashScreenListener)

that's the error I've got.

[peter_strange]

Welcome to the forum.

Your SplashScreen seems to be copied directly from this KB article:

http://supportforums.blackberry.com/t5/Java-Development/Create-a-splash-screen/ta-p/444959

If you are having compile errors with that code then we need to get someone from RIM to have a look.  So can you cut and paste the actual errors you see into the forum for us.

But as noted, this is wrong

pushScreen(SplashScreen);

You need to have created a new instance of the class SplashScreen and to do that you need to have created the screen to be displayed after it.

How new to Java coding are you? 

[zapragartiast]

Yes, I've got the code from the URL.
I'm new on blackberry developer, and I want to learn and making some application on Blackberry.
Maybe you can provide me some code to run splash screen on blackberry, cause I want to know that...

[peter_strange]

I strongly suspect the problems you are having with Splash Screen are a result of you not knowing Java.  So learn java first.  Don't learn it in Blackberry, it is hard to test BlackBerry.  Get a simple book and learn java on your Desktop.  Then when you feel like you can code a program in java come back to BlackBerry. 

[Shraddha]

Your compiler is complaining because:

First I got error on the KeyListener. KeyListener cannot be resolved to a type.

- net.rim.device.api.system package is not imported
Second, SplashScreen cannot be resolved to a variable.

- SplashScreen is a class... not a variable. Create a new instance .. "new SplashScreen()"
Third, The method addKeyListener(KeyListener) in the type Screen is not applicable for the arguments (SplashScreen.SplashScreenListener)

- that's because keylistener is not recognised so "SplashscreenListener implements KeyLIstener" is not working for you.

So basically, it all boils down to (as peter_strange said) .. java fundamentals

It'll be difficult to get on BB directly without sufficient knowledge of java... even the replies will be difficult to understand.

[girishnair12345]

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 java.util.*;

public class SplashScreen extends MainScreen {
private MainScreen next;
private UiApplication application;
private Timer timer = new Timer();
private static final Bitmap _bitmap = Bitmap.getBitmapResource("image.png");
public SplashScreen(UiApplication ui, MainScreen next) {
super(Field.USE_ALL_HEIGHT | Field.FIELD_LEFT);
this.application = ui;
this.next = next;
this.add(new BitmapField(_bitmap));
SplashScreenListener listener = new SplashScreenListener(this);
this.addKeyListener(listener);
timer.schedule(new CountDown(), 5000);
application.pushScreen(this);
}
public void dismiss() {
timer.cancel();
application.popScreen(this);
application.pushScreen(next);
}
private class CountDown extends TimerTask {
public void run() {
DismissThread dThread = new DismissThread();
application.invokeLater(dThread);
}
}
private class DismissThread implements Runnable {
public void run() {
dismiss();
}
}
protected boolean navigationClick(int status, int time) {
dismiss();
return true;
}
protected boolean navigationUnclick(int status, int time) {
return false;
}
protected boolean navigationMovement(int dx, int dy, int status, int time) {
return false;
}
public static class SplashScreenListener implements
KeyListener {
private SplashScreen screen;
public boolean keyChar(char key, int status, int time) {
//intercept the ESC and MENU key - exit the splash screen
boolean retval = false;
switch (key) {
case Characters.CONTROL_MENU:
case Characters.ESCAPE:
screen.dismiss();
retval = true;
break;
}
return retval;
}
public boolean keyDown(int keycode, int time) {
return false;
}
public boolean keyRepeat(int keycode, int time) {
return false;
}
public boolean keyStatus(int keycode, int time) {
return false;
}
public boolean keyUp(int keycode, int time) {
return false;
}
public SplashScreenListener(SplashScreen splash) {
screen = splash;
}
}
}