recorddata1.java

来自「一本介绍手机游戏开发的书中的源代码」· Java 代码 · 共 96 行

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.rms.*;

public class recordData1 extends MIDlet implements CommandListener
{
   Display display;
   List  list;
   Command okCommand;
   Command exitCommand;
   RecordStore[] rs;
   Alert alert;
   int num;

   public recordData1()
   {
      alert=new Alert("记录存储操作结果");
      display=Display.getDisplay(this);
      list=new List("开关记录存储列表", List.EXCLUSIVE);
      okCommand = new Command("确认", Command.OK, 2);
      exitCommand = new Command("离开", Command.EXIT, 2);
      list.append("创建RecordA", null);
      list.append("创建RecordB",null);
      list.append("查看全部记录存储",null);
      list.append("删除RecordA",null);
      list.append("删除RecordB",null);
      list.addCommand(okCommand);
      list.addCommand(exitCommand);
      list.setCommandListener(this); 
      rs=new RecordStore[2];
   }

   public void startApp()
   {
      display.setCurrent(list);         
   }

   public void pauseApp(){}

   public void destroyApp(boolean unconditional){}

   public void commandAction(Command cmd, Displayable disp)
   {
      if (cmd == okCommand)
      {
         String recordname="";
         String[] name=new String[num];
         name=rs[0].listRecordStores();
         for(int i=0;i<num;i++)
              recordname=recordname+name[i]+" ";
         switch(list.getSelectedIndex()){
            case 0:
                 try{
                     rs[0]=RecordStore.openRecordStore("RecordA",true);
                     if(num<2 && !(recordname.indexOf("RecordA")!=-1?true:false))
                       num++;
                 }catch(Exception ex){}
                 alert.setString("RecordA创建完成");
                 break;
            case 1:
                 try{
                     rs[1]=RecordStore.openRecordStore("RecordB",true);
                     if(num<2 && !(recordname.indexOf("RecordB")!=-1?true:false)) 
                       num++;
                 }catch(Exception ex){}
                 alert.setString("RecordB创建完成");          
                 break;
            case 2:
                 alert.setString("查看当前所有记录存储:"+recordname);
                 break;
            case 3:
                 try{                    
                     rs[0].closeRecordStore();
                     RecordStore.deleteRecordStore("RecordA");
                     num--;
                 }catch(Exception ex){}
                 alert.setString("RecordA删除完成");
                 break;
            case 4:
                 try{
                     rs[1].closeRecordStore();
                     RecordStore.deleteRecordStore("RecordB");
                     num--;
                 }catch(Exception ex){}
                 alert.setString("RecordB删除完成");
                 break;
         }
         alert.setTimeout(2000); 
         display.setCurrent(alert, list);
      }
      else if(cmd == exitCommand){
         destroyApp(false);
         notifyDestroyed(); 
      }
   }
}