eventex3.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch04;

import javax.microedition.lcdui.*;
import javax.microedition.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);
  }
}