public void onCreate(Bundle savedInstanceState) {
...
tab2radiogroup.setOnCheckedChangeListener( new OnCheckedChangeListener(){
   @Override
   public void onCheckedChanged(RadioGroup group, final int checkedId) {    
    dialog = ProgressDialog.show(ulsanBUS.this, "", "잠시만 기다려주세요..", true); 
          new Thread(){
     public void run(){
      allstopnum.clear();
      allstopname.clear();
      allstopresult.clear();   
      String direction="0";      
      
      XmlPullParser parser = getResources().getXml(R.xml.allbus);
      if(checkedId == R.id.RadioButton1){
       direction="1";
      }
      else{
       direction="2";
      }
      if( rb1.getText().equals(rb2.getText()) )
       direction="3";
      try{
             int parserEvent = parser.getEventType();         
             while(parserEvent != XmlPullParser.END_DOCUMENT ){
              if(parserEvent == XmlPullParser.START_TAG){           
               if( parser.getName().equals("route") ){             
                if( chosenbus.toString().equals(parser.getAttributeValue(null,"brt_id")) ){             
                 if( direction.toString().equals(parser.getAttributeValue(null,"brt_direction")) ){              
                  parserEvent = parser.next();              
                  while( !parser.getName().equals("route") ){
                         if(parserEvent == XmlPullParser.START_TAG){                      
                          if( parser.getName().equals("stop") ){
                           allstopnum.add( parser.getAttributeValue(null,"id") );
                           allstopname.add( parser.getAttributeValue(null,"name") );
                           allstopresult.add("");        
                          }
                         } 
                         parserEvent = parser.next();
                  }break;                                
                 }               
                }              
               }
              }           
              parserEvent = parser.next();
             }
            } catch( XmlPullParserException e){ e.printStackTrace(); } 
              catch( IOException e){ e.printStackTrace();  }          
             
            allstopresult.set(0,"터치하면 도착정보를 가져옵니다.");             
      tab2radiogrouplistener();   
      dialog.dismiss(); 
     }
          }.start();
   }   
  });

...
이건 다른 메소드 입니다 ~
public void tab2radiogrouplistener(){      
  Runnable update = new Runnable(){   
   @Override
   public void run(){
          Tab2adapter.notifyDataSetChanged();
   }
  };
  handler.post(update);      
 }