关于simpleAdapter刷新的问题（如何利用notifyDataSetChanged()）

private SimpleAdapter restaurantListAdapter=null;



@Override

	    protected void onResume(){

		 super.onResume();

               //利用simpleAdapter

		restaurantListAdapter=new SimpleAdapter(this, getListForSimpleAdapter(), R.layout.restaurant_list_item,

				 new String[]{"restName","Tel"},  new int[]{R.id.titleTextView,R.id.telTextView});

		 getListView().setTextFilterEnabled(true);

		 getListView().setAdapter(restaurantListAdapter);

		 Logger.d("on ruseme");

	 }

private List<Map<String, Object>> getListForSimpleAdapter(){

	    	 List<Map<String,Object>> list=new ArrayList<Map<String, Object>>();

	    	 int n =  locandrest.queryLocAndRestByLocId(locID, this).size();

	    	 Logger.d("The number of Restaurant with locID = "+locID+" is "+n);

	    	 Long restID=null;

	    	 String RestaurantName=null;

	    	 String TelNum =null;

	    	 for(int i = 0; i<n; i++){

	    		 restID=  LocAndRest.queryLocAndRestByLocId(locID, this).get(i).getRestId();

	    		 Logger.d("restID is "+restID);

	    		 RestaurantName = restaurant.queryRestaurantById(restID, this).getName();

	    		 TelNum=restaurant.queryRestaurantById(restID, this).getRestTelNumber();

	    		 Map<String, Object> map = new HashMap<String, Object>();  

	    		 map.put("restName", RestaurantName);

	    		 map.put("Tel", "Tel: "+TelNum);

	    		 map.put("restID", restID);

	    		 

	    		 list.add(map); 

	    	 }

	    	

	    	 return list;

	    }

	    

 //删除按钮监听_____________________________未完成 有误(无法刷新)

	    protected DialogInterface.OnClickListener deleteRestButtonListener(){

	    	 return new DialogInterface.OnClickListener() {

	             @SuppressWarnings("unchecked")

				public void onClick(DialogInterface dialog, int id) {

	            	 

	             Map<String,Object> mapRest =(Map<String, Object>) restaurantListAdapter.getItem(positionOfItem);

	             positionId=(Long) mapRest.get("restID");

	           

	             deleteRestaurant(positionId);

	             String str = "The restaurant which restId (positionId) is "+positionId+"is deleted in Restaurant Table";

	             Logger.d(str);

	

	             getListForSimpleAdapter().remove(positionOfItem);



	             Logger.d("the size of list is "+getListForSimpleAdapter().size());

	             SimpleAdapter sa=   (SimpleAdapter) getListView().getAdapter();

	

	            sa.notifyDataSetChanged();

	             

	             removeDialog(CONFIRM_DELETE_DIALOG);//清除缓存

	             }

			

	         };

	    }