How to close a J2ME application by key pressing

One simple way (which may not be very elegant, depending on how you have written your midlet): When you create your canvas, do it something like this:

in your Midlet, pass a reference to the Midlet itself to your Canvas constructor:

MyCanvas theCanvas = new MyCanvas(this, ...);

in the Canvas constructor, save the Midlet reference:

class MyCanvas extends Canvas implements CommandListener {
  MyMidlet theMidlet;

  public MyCanvas(MyMidlet m, ...) {
    this.theMidlet = m;
    ...
  }

...
}

Then, when you want to close the midlet from keyPressed in MyCanvas,
just call theMidlet.destroyApp()

Peter