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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);
}
}
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