J2ME--显示手机通讯录记录（有待完善）

import java.io.*;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.rms.RecordEnumeration;
import javax.microedition.rms.RecordStore;
import javax.microedition.lcdui.*;

public class MyPhoneBookUI extends MIDlet implements CommandListener{
   private Display dis;
   private List menu=new List("通讯簿",Choice.IMPLICIT);
   private Command cmdSelect=new Command("选择",Command.OK,1);
   private Command cmdExt=new Command("退出",Command.EXIT,1);

  
   private Form addForm =new Form("添加新的联系人");
   private TextField txtName = new TextField("姓名","", 20 , TextField.ANY); //姓名
   private TextField txtTel = new TextField("电话","", 15, TextField.NUMERIC);//电话
   private Command cmdBack = new Command("返回",Command.BACK,1);
   private Command cmdSave = new Command("保存",Command.OK,2);
  
   private RecordStore rs;
   private RecordEnumeration re;
   private String dbname="Book";
  
  
   static final Command cmdDelete = new Command("删除", Command.SCREEN, 1);
   static final Command cmdInfo= new Command("详细", Command.SCREEN, 1) ;
  
 
  
  
 public MyPhoneBookUI() {
  dis=Display.getDisplay(this);
 }
 
 public void addData(){
     String name=txtName.getString();//获得用户输入的姓名
     String tel=txtTel.getString();
     try{
      rs=RecordStore.openRecordStore(dbname, true);
      ByteArrayOutputStream baos = new ByteArrayOutputStream( );
      DataOutputStream os = new DataOutputStream(baos);
            os.writeUTF(name);
            os.writeUTF(tel);
            os.writeInt(rs.getNextRecordID());//rs.getNextRecordID得到数据库中下一个可用的记录编号
            byte[] data = baos.toByteArray( );
            rs.addRecord(data, 0, data.length);
            System.out.println("添加记录成功");
            os.close();
            baos.flush();
            os.flush();
            rs.closeRecordStore();
           
     }
     catch(Exception e){
      e.printStackTrace();
     }
    }
 
  //显示主界面
    public void MainForm()
    {
        //选择列表
      
     menu.append("全部通讯录", null) ;
     menu.append("添加", null);
     menu.addCommand(cmdSelect);
     menu.setSelectCommand(cmdSelect);
     menu.addCommand(cmdExt);
     menu.setCommandListener(this);
      
        dis.setCurrent(menu) ;
    }
 protected void destroyApp(boolean arg0)  {
  // TODO Auto-generated method stub
           notifyDestroyed();
 }

 protected void pauseApp() {
  // TODO Auto-generated method stub

 }

 protected void startApp() throws MIDletStateChangeException {
   addForm.append(txtName) ;//將添加窗口做好
      addForm.append(txtTel) ;
      addForm.addCommand(cmdSave) ;
      addForm.addCommand(cmdBack) ;
      addForm.setCommandListener(this) ;
     
      MainForm();
 }
 
 //显示添加联系人记录界面
    public void AddForm()
    {
     
        dis.setCurrent(addForm);
    }
    //列举所有联系人记录
    public void listAllForm()
    {   //联系人列表
        List myList = new List("所有联系人", Choice.EXCLUSIVE);
        myList.addCommand(cmdBack);
        myList.setCommandListener(this) ;
       //从数据库中获取所有记录，动态添加到myList列表框中
        try{
         rs=RecordStore.openRecordStore(dbname, true);
         re=rs.enumerateRecords(null, null, true);
         if(re.numRecords()==0){
          myList.append("没有记录", null);
         }
         else{
          while(re.hasNextElement()){
           byte[] Tmp=re.nextRecord();
           ByteArrayInputStream baos = new ByteArrayInputStream(Tmp );
           DataInputStream os = new DataInputStream(baos);
           myList.append(os.readUTF(), null);
          }
         }
        }
        catch(Exception e){
         e.printStackTrace();
        }
       
       
       
        myList.addCommand(cmdInfo);
        myList.addCommand(cmdDelete);
    
        dis.setCurrent(myList);
    }
  
 public void commandAction(Command c, Displayable d) {
   //主屏幕的菜单选择
  if(c==cmdExt){
   destroyApp(true);
  }
  else{
        if(c == cmdSelect){
            List tmp = (List)d;
            switch(tmp.getSelectedIndex()){
                case 0 :    listAllForm();//显示所有记录
                            break ;
                case 1 :    AddForm();//显示添加记录界面
                            break ;
            }
        }
        if(c==cmdBack){
         dis.setCurrent(menu);
        }
        if(c==cmdInfo){//查看某记录的详情
         
        }
        if(c==cmdDelete){//删除某记录
         
        }
        if(c==cmdSave){//保存记录
         addData();
         listAllForm();
        }
  
 }
 }

}