Screen not getting refreshed

[Danish Shaukat]

Hi !
I am trying to use low-level graphics. Just a simple midlet that draws a rectangle. The problem is that it draws on the previous screen. The screen is not getting refreshed. You can see my code below.
Danish

  
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
public class Rectangle extends MIDlet implements CommandListener
{
private Display display;
private RectangleCanvas screen;
private Command exitCMD;
//Constructor
public Rectangle()
{
display=Display.getDisplay(this);
initScreen();
}
public void startApp()throws MIDletStateChangeException
{
display.setCurrent(screen);
}
public void pauseApp()
{
}
public void destroyApp(boolean unconditional)
{
}
public void commandAction(Command c,Displayable d)
{
if(d==screen && c==exitCMD)
{
destroyApp(true);
notifyDestroyed();
}
}
private void initScreen()
{
screen=new RectangleCanvas();
exitCMD=new Command("Exit",Command.EXIT,1);
screen.addCommand(exitCMD);
screen.setCommandListener(this);
}



//Rectangle Canvas
class RectangleCanvas extends Canvas
{
public void paint(Graphics g)
{
g.drawRect(5,50,15,55);

}

//class ends
}
//class ends
}

[Mark Spritzler]

Took me a while to realize what you meant by it draws on the previous screen. You mwan the screen with the name of your MIDlet, that it doesn't clear that out before drawing your rectangle.
I had had that problem when I first created a canvas, then I realized that for the Canvas, you need to clear the screen with code like this

 
int width = getWidth();
int height = getHeight();
g.setColor( 244, 224, 184 );
g.fillRect( 0, 0, width, height);
 

Now that setColor, you want to change the numbers to whatever color you want the background to be. It fills in a rectangle that is the size of the screen.
Mark