Canvas.setCommandListener(CommandListener l) : Canvas « javax.microedition.lcdui « Java by API

1. Java by API
2. javax.microedition.lcdui
3. Canvas

Canvas.setCommandListener(CommandListener l)

 


/* License
 * 
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 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *      this list of conditions and the following disclaimer.
 * 
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 * may be used to endorse or promote products derived from this software
 * without specific prior written permission.
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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.midlet.MIDlet;

public class EventEx3 extends MIDlet {
  Display display;
  Command exit;

  public EventEx3() {
    display = Display.getDisplay(this);
  }

  public void destroyApp(boolean unconditional) {
  }

  public void pauseApp() {
    System.out.println("App paused.");
  }

  public void startApp() {
    display = Display.getDisplay(this);

    Canvas canvas = new Canvas() { // anonymous class
      public void paint(Graphics g) {
      }
      protected void keyPressed(int keyCode) {
        if (keyCode > 0) {
          System.out.println("keyPressed " + ((char) keyCode));
        } else {
          System.out.println("keyPressed action " + getGameAction(keyCode));
        }
      }
      protected void keyReleased(int keyCode) {
        if (keyCode > 0) {
          System.out.println("keyReleased " + ((char) keyCode));
        } else {
          System.out.println("keyReleased action " + getGameAction(keyCode));
        }
      }
    }; // end of anonymous class

    exit = new Command("Exit", Command.STOP, 1);
    canvas.addCommand(exit);
    canvas.setCommandListener(new CommandListener() {
      public void commandAction(Command c, Displayable d) {
        if (c == exit) {
          notifyDestroyed();
        } else {
          System.out.println("Saw the command: " + c);
        }
      }
    });
    display.setCurrent(canvas);
  }
}

   
  

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