midpapplication.java~1~

基于J2ME 技术,开发的一个简单的手机程序.对于初学者有极大的帮助

package wh;

import java.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Displayable;

public class MIDPApplication extends MIDlet
                         implements CommandListener{
  Ticker newsTicker;

  private List menuList;          //主菜单

  private List commList;          //通讯簿菜单

  private Command enterCommand;   //进入
  private Command exitCommand;    //离开
  private Command execCommand;    //执行
  private Command menuCommand;    //主目录
  private Command commCommand;    //通讯簿
  private Command configCommand;  //确定
  private Command backCommand;    //返回

  private Command saveCommand;    //存储

  Form queryForm = null;
  Form modificationForm = null;
  Form deleteForm = null;

  TextField nameField;
  TextField EMailField;
  TextField ageField;
  Image aImage;
  ImageItem imageItem;


  String[] menuItem ={"通讯簿","关于","退出"};
  String[] commItem ={"新增","查询","修改","删除"};


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

   //The display for this MIDlet
  private Display display;
  private String currentScreen = "";
  public static String  criteria = "";
  private int deleteID = 0;
  private int modificationID = 0;

  public MIDPApplication() {
    display = Display.getDisplay(this);
    newsTicker = new Ticker("欢迎老师检查作业！");
    enterCommand = new Command("进入",Command.OK,1);
    menuCommand = new Command("主目录",Command.SCREEN, 1);
    commCommand = new Command("通讯簿",Command.SCREEN, 1);
    commCommand = new Command("关于",Command.SCREEN,2);
    execCommand = new Command("执行",Command.OK, 1);
    exitCommand = new Command("离开", Command.EXIT, 1);
    configCommand = new Command("确定",Command.OK,1);
    backCommand = new Command("返回",Command.BACK,1);

    try
    {
        aImage=Image.createImage("/wh.png");
    }
    catch(Exception e)
    {}
    imageItem=new ImageItem( null,aImage,ImageItem.LAYOUT_CENTER,"sorry");
  }


  public void startApp() {
    Form aForm=new Form("个人相片");
    aForm.append(aImage);
    aForm.append(imageItem);
    aForm.addCommand(enterCommand);
    aForm.addCommand(exitCommand);
    aForm.setCommandListener(this);
    display.setCurrent(aForm);

    menuList = new List(null,List.IMPLICIT,menuItem,menuImage);
       menuList.setTicker(newsTicker);
       menuList.addCommand(exitCommand);
       menuList.setCommandListener(this);



  }

  public void pauseApp() { }
  public void destroyApp(boolean unconditional) { }
  public void commandAction(Command c, Displayable s) {

    if (c == exitCommand) {
        destroyApp(false);
        notifyDestroyed();
    }
    if(c==enterCommand){

       display.setCurrent(menuList);
       currentScreen="主目录";

    }
    if(c==List.SELECT_COMMAND){
                if(currentScreen=="主目录"){
                   int itemIndex = menuList.getSelectedIndex();
                   switch(itemIndex){
                              case 0: {
                                     doCommunication();
                                     break;
                                      }
                              case 1: {
                                Alert aAlert;
                                aAlert =new Alert  ("我的信息","姓名：万慧 \n学号：02221519\n网通(1)班",null,
                                             AlertType.INFO);
                                aAlert.setTimeout(6000);
                                display.setCurrent(aAlert);
                                break;
                                      }
                              case 2:{
                                      doexit();
                                      break;
                                     }

                                    }
                                          }
                else if(currentScreen=="通讯簿"){


           int itemIndex = commList.getSelectedIndex();
           switch(itemIndex){
                           case 0:{
                                   doAppend();      //添加信息
                                   break;
                           }
                           case 1:{
                                   doQuery();       //查询信息
                                   break;
                           }
                           case 2:{
                                   doModification();//修改信息
                                   break;
                           }
                           case 3:{
                                   doDelete();      //删除信息
                                   break;
                           }
                   }



        }
      }


   if(c==configCommand)
   {
     int itemIndex = commList.getSelectedIndex();
           switch(itemIndex){
                           case 0:{
                                   doAppend();      //添加信息
                                   break;
                           }
                           case 1:{
                                   doQuery();       //查询信息
                                   break;
                           }
                           case 2:{
                                   doModification();//修改信息
                                   break;
                           }
                           case 3:{
                                   doDelete();      //删除信息
                                   break;
                           }
                   }





   }

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

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

        if(c==execCommand){
                if(currentScreen=="通讯簿查询"){
                        this.criteria = nameField.getString();
                        doQueryPerson();
                        queryForm = null;
                }
                if(currentScreen=="通讯簿删除"){
            doQueryPerson();
            doDeletePerson(this.deleteID);
                }
                if(currentScreen=="通讯簿修改"){
                   modificationID = 0;
           doQueryPerson();
          if(!nameField.getString().equals("无此数据!")){
              System.out.println("i am here"+ ":" + modificationID);
              EMailField = new TextField("E Mail",null,30,TextField.EMAILADDR);
              ageField = new TextField("年龄",null,3,TextField.NUMERIC);

                          saveCommand = new Command("存储",Command.SCREEN,1);
                          modificationForm.addCommand(saveCommand);
                          modificationForm.removeCommand(execCommand);
                          modificationForm.append(EMailField);
                          modificationForm.append(ageField);

                  }
                  else{

                  }

                }
        }
//------存储通讯簿的数据