line_stroke_midlet.java

本光盘是《J2ME无线移动游戏开发》一书的配套光盘

package ch05;

import java.io.*;
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;

public class Line_Stroke_MIDlet
    extends MIDlet
    implements CommandListener {

  //声明一个实现绘制的Canvas类对象
  private Line_Stroke_Canvas lsc;

  /*
   1.启动应用程序
   */
  public void startApp() {
    if (lsc == null) {
      try {
        lsc = new Line_Stroke_Canvas();
        Display.getDisplay(this).setCurrent(lsc);

        Command exitCommand = new Command("退出", Command.EXIT, 0);
        lsc.addCommand(exitCommand);
        lsc.setCommandListener(this);

        //启动绘制图形
        lsc.start();
      }
      catch (IOException ioe) {
        System.out.println(ioe);
      }
    }
  }

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

  //撤消应用程序
  public void destroyApp(boolean unconditional) {
  }

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