Custom BaseAdapter and notifyDataSetChanged

When making a custom adapter from BaseAdapter, I got the problem that calling notifyDataSetChanged() doesn't work - new data isn't refreshed as expected.

Below is my code:

 public class RowAdapter extends BaseAdapter {  
   private List<? extends RowDO> data;  
   public RowAdapter(List<? extends RowDO> d) {  
     data = d;  
   }  
   @Override  
   public int getCount() {  
     return data.size();  
   }  
   ...  
 }  
 public class MainActivity extends Activity {  
   private RowAdapter rowAdapter;  
   private List<RowDO> listDO;  
   ...  
   private void displayList(){  
     listDO = getListDO();  
     if (rowAdapter == null) {  
       rowAdapter = new RowAdapter(listDO);  
       ListView listView = (ListView) findViewById(R.id.list);  
       listView.setAdapter(rowAdapter);  
     } else {  
       rowAdapter.notifyDataSetChanged();  
     }  
   }  
   private List<RowDO> getListDO() {  
     List<RowDO> list = new ArrayList<RowDO>();  
     list.add(new RowDO());  
     if (some_conditions) {  
       ...  
     }  
     return list;  
   }  
 }  

After google around, I found Snicolas answer

The list I use in my adapter (data) is a reference to the list created in getListDO() when passing it to adapter at first time. So the next time, when I re-assign the listDO with the new list, the old copy in the adapter is still there.

To correct this, we should keep the original list as below code:

 private List<RowDO> listDO = new ArrayList<RowDO>();  
 private void displayList(){  
   listDO.clear();  
   listDO.addAll(getListDO());  
   if (rowAdapter == null) {   
     rowAdapter = new RowAdapter(listDO);   
     ListView listView = (ListView) findViewById(R.id.list);   
     listView.setAdapter(rowAdapter);   
    } else {   
     rowAdapter.notifyDataSetChanged();   
    }   
 }