The application does not use the screen and run in the background

Question

Hi
I have downloaded a package of j2me Midlet
from [link] here [link]
and try to reuse the code
but I get the following error when running the code:-
The application does not use the screen and run in the background
I think the error into one of these two classes
package main;
import javax.microedition.midlet.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.Manager;
import javax.microedition.media.MediaException;
import javax.microedition.media.Player;
import java.io.IOException;
import java.io.InputStream;
public class MainMidlet extends MIDlet implements CommandListener {
    private SSGameCanvas gameCanvas ;
    private Command exitCommand ;
    private Player player = null;
    public void startApp() {
  try {
       //   create new game thread
          gameCanvas = new SSGameCanvas();
          gameCanvas.start(); // start game thread
          exitCommand = new Command("Exit",Command.EXIT,1);
          gameCanvas.addCommand(exitCommand);
          gameCanvas.setCommandListener(this);
            Display.getDisplay(this).setCurrent(gameCanvas);
   catch (java.io.IOException e)
            e.printStackTrace();
        try {
            // start sounds
            InputStream in = getClass().getResourceAsStream("/resource/startfly.wav");
            player = Manager.createPlayer(in,"audio/x-wav");
            player.setLoopCount(1);
            player.start();
        catch (MediaException ex)
            ex.printStackTrace();
         catch (IOException ex)
            ex.printStackTrace();
    public void pauseApp() {
    public void destroyApp(boolean unconditional) {
        if (player != null) {
            player.close();
        System.gc();
  public void commandAction(Command command, Displayable displayable) {
       if (command == exitCommand)
             destroyApp(true);
             notifyDestroyed();
package main;
import java.io.IOException;
import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.*;
public class SSGameCanvas extends GameCanvas implements Runnable {
    protected GameManager gameManager;
    protected boolean running;
    private int tick=0;
    private static int WIDTH;
    private static int HEIGHT;
    private int mDelay = 20;
    Form mainForm;
    Display display;
    //private int MaxTime;
    public SSGameCanvas() throws IOException{
        super(true);
        gameManager = new GameManager(5,5,getHeight()-10,getWidth()-10,this);
    public void start() {
            this.running = true;
            Thread t = new Thread(this);
            t.start();
    public void stop() {
        running = false;
    public void render(Graphics g) {
        WIDTH = getWidth();
        HEIGHT = getHeight();
        // Clear the Canvas.
        g.setColor(0, 0, 50);
        g.fillRect(0,0,WIDTH-1,HEIGHT-1);
        // draw border
        g.setColor(200,0,0);
        g.drawRect(0,0,WIDTH-1,HEIGHT-1);
        // draw game canvas
        gameManager.paint(g);
    public void run() {
        while (running) {
            // draw graphics
            render(getGraphics());
            // advance to next graphics
            advance(tick++);
            // display
            flushGraphics();
            try { Thread.sleep(mDelay); }
            catch (InterruptedException ie) {}
    public void advance(int ticks) {
        // advance to next game canvas
        gameManager.advance(ticks);
        this.paint(getGraphics());
}Edited by: VANPERSIE on Jul 10, 2012 12:26 PM

Answer 1

Hi Andi,
Thanks for your reply.
Yes, I have waited for a while and the result doesn't change.
The Porblem here is the application is seen started in visual administrator.Only restart brings up the page back.
Can you please suggest anything.
Thanks and regards
Nagaraj