star_midlet.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch08;

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;

public class Star_MIDlet
    extends MIDlet
    implements CommandListener {

  //声明一个Display对象
  private Display mDisplay;

  //声明一个GameCanvas对象
  private Star_Canvas mCanvas;

  //声明一个退出按钮Command对象
  private Command mExitCommand;

  /*
   1.启动应用程序
   */
  public void startApp() {
    if (mCanvas == null) {
      mCanvas = new Star_Canvas();
      mCanvas.start();
      mExitCommand = new Command("退出", Command.EXIT, 0);
      mCanvas.addCommand(mExitCommand);
      mCanvas.setCommandListener(this);
    }

    mDisplay = Display.getDisplay(this);
    mDisplay.setCurrent(mCanvas);
  }

  //挂起应用程序
  public void pauseApp() {}

  /*
   2.撤消应用程序
   */
  public void destroyApp(boolean unconditional) {
    mCanvas.stop();
  }

  /*
   3.响应按钮事件
   */
  public void commandAction(Command c, Displayable s) {
    if (c.getCommandType() == Command.EXIT) {
      destroyApp(true);
      notifyDestroyed();
    }
  }
}