Offscreen MIDlet

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDlet;

public class OffscreenMIDlet extends MIDlet {
  public void startApp() {
    Displayable d = new OffscreenCanvas();

    d.addCommand(new Command("Exit", Command.EXIT, 0));
    d.setCommandListener(new CommandListener() {
      public void commandAction(Command c, Displayable s) {
        notifyDestroyed();
      }
    });

    Display.getDisplay(this).setCurrent(d);
  }

  public void pauseApp() {
  }

  public void destroyApp(boolean unconditional) {
  }
}

class OffscreenCanvas extends Canvas {
  private Image mImage;

  public void paint(Graphics g) {
    if (mImage == null)
      initialize();
    g.drawImage(mImage, 0, 0, Graphics.TOP | Graphics.LEFT);
  }

  private void initialize() {
    int w = getWidth();
    int h = getHeight();

    mImage = Image.createImage(w, h);

    Graphics g = mImage.getGraphics();

    g.drawRect(0, 0, w - 1, h - 1);
    g.drawLine(0, 0, w - 1, h - 1);
    g.drawLine(w - 1, 0, 0, h - 1);
  }
}

1.	Simple Midlet Demo
2.	Piano MIDlet
3.	Pacer
4.	Pointer Example
5.	Text Example
6.	Simple Canvas
7.	Illustrate Graphics MIDlet
8.	Translate Coordinates
9.	Key Canvas
10.	Box Text Canvas
11.	Quatsch MIDlet
12.	Sweep Game
13.	Sweep
14.	Text MIDlet
15.	Translate coordinate system
16.	Show various anchor points
17.	Draw mutable image on a canvas
18.	Canvas for processing key code and commands
19.	Draw immutable image on a canvas
20.	Use pointer events to draw onto the Canvas
21.	A quick sample of graphics, commands, and event handling.

Offscreen MIDlet : 2D « J2ME « Java

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