midpapplication.java

j2me的程序

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

// A first MIDlet with simple text and a few commands.
public class MIDPApplication extends MIDlet
		         implements CommandListener{
  Ticker newsTicker;              //设置头条新闻用

  private List menuList;          //主菜单
  private List luckyList;         //一周运势菜单
  private List commList;          //通讯簿菜单

  private Command exitCommand;    //离开
  private Command execCommand;    //执行
  private Command menuCommand;    //主目录
  private Command commCommand;    //通讯簿
  private Command luckyCommand;   //一周运势
  private Command saveCommand;    //存储

  String[] menuItem ={"通讯簿","一周运势"};
  String[] commItem ={"新增","查询","修改","删除"};
  String[] luckyItem ={"金牛座","处女座","摩羯座",
   	                   "射手座","牡羊座","狮子座",
   	                   "双鱼座","巨蟹座","天蝎座",
   	                   "双子座","天秤座","水瓶座"
 	                  };

  Image[] menuImage = {createImage("/Sokoban.png"),
                      createImage("/Tiles.png")
                      };

   //The display for this MIDlet
  private Display display;
  private String currentScreen = "";

  public MIDPApplication() {
    display = Display.getDisplay(this);
    newsTicker = new Ticker("Java J2MEMIDP一书已出版  北京申奥成功");
    exitCommand = new Command("离开", Command.EXIT, 1);
    execCommand = new Command("执行",Command.OK, 1);
    menuCommand = new Command("主目录",Command.SCREEN, 1);
    commCommand = new Command("通讯簿",Command.SCREEN, 1);
    luckyCommand = new Command("运势",Command.SCREEN,1);

  }

  // Start the MIDlet by creating the TextBox and
  // associating the exit command and listener.
  public void startApp() {
    menuList = new List(null,List.IMPLICIT,menuItem,menuImage);
    menuList.setTicker(newsTicker);
	menuList.addCommand(exitCommand);
	menuList.setCommandListener(this);
	display.setCurrent(menuList);
	currentScreen="主目录";

  }

  // Pause is a no-op because there are no background
  // activities or record stores to be closed.
  public void pauseApp() { }

  // Destroy must cleanup everything not handled
  // by the garbage collector.
  // In this case there is nothing to cleanup.
  public void destroyApp(boolean unconditional) { }



  // Respond to commands. Here we are only implementing
  // the exit command. In the exit command, cleanup and
  // notify that the MIDlet has been destroyed.
  public void commandAction(Command c, Displayable s) {
    if (c == exitCommand) {
        destroyApp(false);
        notifyDestroyed();
    }

    if(c==List.SELECT_COMMAND){
		if(currentScreen=="主目录"){
		   int itemIndex = menuList.getSelectedIndex();
		   switch(itemIndex){
		   	   case 0: {
			    	 doCommunication();
				     break;
				 }
			  case 1: doLucky();
		   }
	    }
		else if(currentScreen=="通讯簿"){
           int itemIndex = commList.getSelectedIndex();
           switch(itemIndex){
			   case 0:{
				   doAppend();
				   break;
			   }
			   case 1:{
				   doQuery();
				   break;
			   }
			   case 2:{
				   doModification();
				   break;
			   }
			   case 3:{
				   doDelete();
				   break;
			   }
		   }

		 }
		 else{

		 }
	}

	if(c==menuCommand){
		display.setCurrent(menuList);
        currentScreen="主目录";
	}

	if(c==commCommand){
		doCommunication();

	}

	if(c==luckyCommand){
		doLucky();
	}

    if(c==menuCommand){
        doMenu();

	}

	if(c==execCommand){
		if(currentScreen=="一周运势"){
			showLucky();
		}
	}
}

 private Image createImage(String name){
      Image aImage = null;
      try{
         aImage = Image.createImage(name);
      }
      catch(IOException e){
      }
      return aImage;
 }

 private void doMenu(){
     currentScreen="主目录";
     display.setCurrent(menuList);
 }

 private void doCommunication(){
     Image[] commIcon = {createImage("/StarCruiser.png"),
                         createImage("/Stock.png"),
                         createImage("/ManyBalls.png"),
                         createImage("/Tiles.png")
                        };

	 commList = new List("通讯簿",List.IMPLICIT,commItem,commIcon);

     commList.addCommand(luckyCommand);
     commList.addCommand(menuCommand);
     commList.setCommandListener(this);
     currentScreen="通讯簿";
     display.setCurrent(commList);
 }

  private void doLucky(){
 	 luckyList = new List("一周运势",List.EXCLUSIVE,luckyItem,null);

     luckyList.addCommand(commCommand);

     luckyList.addCommand(menuCommand);
     luckyList.addCommand(execCommand);
     luckyList.setCommandListener(this);
     currentScreen="一周运势";
     display.setCurrent(luckyList);
 }

 private void showLucky(){
	 int selectedItem = luckyList.getSelectedIndex();
	 Alert alert;
	 String information="";
	 switch(selectedItem){
		 case 0:{
			 information = "金牛座";
			 break;
		 }
		 case 1:{
			 information = "处女座";
			 break;
		 }
		 case 2:{
			 information = "摩羯座";
			 break;
		 }
		 case 3:{
			 information = "射手座";
			 break;
		 }
		 case 4:{
			 information = "牡羊座";
			 break;
		 }
		 case 5:{
			 information = "狮子座";
			 break;
		 }
		 case 6:{
			 information = "双鱼座";
			 break;
		 }
		 case 7:{
			 information = "巨蟹座";
			 break;
		 }
		 case 8:{
			 information = "天蝎座";
			 break;
		 }
		 case 9:{
			 information = "双子座";
			 break;
		 }
		 case 10:{
			 information = "天秤座";
			 break;
		 }
		 case 11:{
			 information = "水瓶座";
			 break;
		 }
	 }

	 alert = new Alert("信息",information,null,AlertType.INFO);
	 alert.setTimeout(Alert.FOREVER);
	 display.setCurrent(alert);
 }

 private void doAppend(){
     Form appendForm = new Form("新增");
     saveCommand = new Command("存储",Command.SCREEN,1);
	 TextField nameField = new TextField("姓名",null,10,TextField.ANY);
	 TextField EMailField = new TextField("E Mail",null,10,TextField.EMAILADDR);
	 TextField ageField = new TextField("年龄",null,10,TextField.NUMERIC);
	 appendForm.append(nameField);
	 appendForm.append(EMailField);
	 appendForm.append(ageField);
	 appendForm.addCommand(saveCommand);
	 appendForm.addCommand(commCommand);
	 appendForm.addCommand(luckyCommand);
     appendForm.setCommandListener(this);
	 currentScreen = "通讯簿新增";
	 display.setCurrent(appendForm);
 }
 private void doModification(){
     Form modificationForm = new Form("修改");
	 TextField nameField = new TextField("姓名",null,10,TextField.ANY);
	 modificationForm.append(nameField);
	 modificationForm.addCommand(execCommand);
	 modificationForm.addCommand(commCommand);
	 modificationForm.addCommand(luckyCommand);
     modificationForm.setCommandListener(this);
	 currentScreen = "通讯簿修改";
	 display.setCurrent(modificationForm);
 }
 private void doQuery(){
     Form queryForm = new Form("查询");
	 TextField nameField = new TextField("姓名",null,10,TextField.ANY);
	 queryForm.append(nameField);
	 queryForm.addCommand(execCommand);
	 queryForm.addCommand(commCommand);
	 queryForm.addCommand(luckyCommand);
     queryForm.setCommandListener(this);
	 currentScreen = "通讯簿查询";
	 display.setCurrent(queryForm);
 }
 private void doDelete(){
     Form deleteForm = new Form("删除");
 	 TextField nameField = new TextField("姓名",null,10,TextField.ANY);
	 deleteForm.append(nameField);
	 deleteForm.addCommand(execCommand);
	 deleteForm.addCommand(commCommand);
	 deleteForm.addCommand(luckyCommand);
     deleteForm.setCommandListener(this);
	 currentScreen = "通讯簿删除";
	 display.setCurrent(deleteForm);
 }
}