hitmouse_midlet.java

J2ME下的图形编程实例,包括简单图形的绘制,以及一个打老鼠的游戏实现.可为学习参考.

package ch05;

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

public class Hitmouse_MIDlet
    extends MIDlet
    implements CommandListener {
  //声明一个Display对象
  Display display;

  //老鼠出现的事件间隔，用来控制游戏难度
  static int time = 3000;

  //存储各类图标
  Image image;

  //提示信息滚动条
  Ticker currentTicker;

  //游戏选项列表
  List frm;

  //声明一个退出按钮
  Command exitCommand;

  //声明一个返回按钮
  Command backCommand;

  //声明一个停止按钮
  Command stopCommand;

  //声明一个确认按钮
  Command sureCommand;

  //声明一个单选按钮组
  ChoiceGroup radioChoiceGroup;

  //声明一个实现绘制的Canvas类对象
  Hitmouse_Canvas lhc;

  //窗体
  Form fm;

  //构造器
  public Hitmouse_MIDlet() {
    display = Display.getDisplay(this);
  }

  //启动应用程序
  public void startApp() {
    display.setCurrent(creatAlect("欢迎进入打老鼠游戏", "/icons/hitmouse/start.png",
                                  "欢迎游戏"));
    display.setCurrent(creatList());
    fm = creatForm();
  }

  //创建欢迎提示框
  public Alert creatAlect(String content, String imgpath, String title) {
    try {
      currentTicker = new Ticker("");
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    Alert currentAlert = new Alert(title);
    currentAlert.setString(content);
    try {
      image = Image.createImage(imgpath);
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    currentAlert.setImage(image);
    currentAlert.setType(AlertType.ALARM);
    currentAlert.setTimeout(3000);
    return currentAlert;
  }

  //创建一个游戏功能选项列表
  public List creatList() {
    frm = new List("欢迎游戏", List.IMPLICIT);
    Image aimage = null, bimage = null, cimage = null;
    String str[] = {
        "开始新游戏", "难度设定", "成绩统计"};
    try {
      aimage = Image.createImage("/icons/background/star.png");
      bimage = Image.createImage("/icons/background/hand.png");
      cimage = Image.createImage("/icons/background/boot.png");
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    //建立一个列表框
    Image[] imageArray = {
        aimage, bimage, cimage};
    for (int i = 0; i < str.length; i++) {
      frm.append(str[i], imageArray[i]);
    }
    exitCommand = new Command("退出", Command.EXIT, 0);
    sureCommand = new Command("确定", Command.OK, 1);
    frm.addCommand(exitCommand);
    frm.addCommand(sureCommand);
    frm.setCommandListener(this);
    frm.setTicker(currentTicker);
    return frm;
  }

  //创建游戏难度设定窗体
  public Form creatForm() {
    fm = new Form("难度设定");
    backCommand = new Command("返回", Command.BACK, 0);
    radioChoiceGroup = new ChoiceGroup("难度设定", ChoiceGroup.EXCLUSIVE);
    String[] stringArray1 = {
        "初级游戏", "中级游戏", "高级游戏"};
    Image aimage = null, bimage = null, cimage = null;
    try {
      aimage = Image.createImage("/icons/background/star.png");
      bimage = Image.createImage("/icons/background/hand.png");
      cimage = Image.createImage("/icons/background/boot.png");
    }
    catch (Exception e) {
      System.out.println(e.getMessage());
    }
    Image[] imageArray = {
        aimage, bimage, cimage};
    for (int i = 0; i < stringArray1.length; i++) {
      radioChoiceGroup.append(stringArray1[i], imageArray[i]);
    }
    fm.append(radioChoiceGroup);
    fm.addCommand(backCommand);
    fm.setCommandListener(this);
    return fm;
  }

  //加入画板方法
  public Hitmouse_Canvas drawBook() {
    if (lhc == null) {
      try {
        lhc = new Hitmouse_Canvas();
        stopCommand = new Command("停止", Command.STOP, 0);
        lhc.addCommand(stopCommand);
        lhc.setCommandListener(this);
        lhc.start();
      }
      catch (IOException ioe) {
        System.out.println(ioe);
      }
    }
    return lhc;
  }

  //创建一个按钮监听器
  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
      destroyApp(true);
      notifyDestroyed();
    }
    if (c == sureCommand) {
      if (frm.isSelected(0)) {
        display.setCurrent(drawBook());
      }
      if (frm.isSelected(1)) {
        display.setCurrent(fm);
      }
      if (frm.isSelected(2)) {
        try {
          display.setCurrent(creatAlect("共出现" + Hitmouse_Canvas.bornmouse +
                                        "只老鼠，" + "恭喜你打中" +
                                        Hitmouse_Canvas.killedmouse +
                                        "只老鼠  ，获得" +
                                        Hitmouse_Canvas.killedmouse * 100 /
                                        Hitmouse_Canvas.bornmouse + "分！",

                                        "/icons/hitmouse/laugh.png", "恭喜"));

        }
        catch (Exception ex) {
          display.setCurrent(creatAlect("抱歉！您还未进行打老鼠游戏！",
                                        "/icons/hitmouse/laugh.png", "抱歉"));
        }
        Hitmouse_Canvas.bornmouse = 0;
        Hitmouse_Canvas.killedmouse = 0;
      }
    }
    if (c == stopCommand) {
      display.setCurrent(frm);
    }
    if (c == backCommand) {
      if (radioChoiceGroup.getSelectedIndex() == 0) {
        time = 3000;
      }
      if (radioChoiceGroup.getSelectedIndex() == 1) {
        time = 1000;
      }
      if (radioChoiceGroup.getSelectedIndex() == 2) {
        time = 300;
      }
      display.setCurrent(frm);
    }
  }

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

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

}