Callback<ItemMessage> deleteCallback = new Callback<ItemMessage>() {
        @Override
        public void success(ItemMessage item, Response response) {
          //wrong 
          //This foreach loop creates an Iterator object in the background.
          for(ItemMessage i:itemMessages){
             if(i.getItemId() == currentItemId){
                 itemMessages.remove(i);
             }
          }

          //Right
          for(int i = 0; i<itemMessages.size(); i++){
              if(itemMessages.get(i).getItemId() == currentItemId){
                  itemMessages.remove(i);
              }
          }


         //wrong
         ListIterator<ItemMessage> itWrong = itemMessages.iterator();
         while(itWrong.hasNext()){
          ItemMessage value = itWrong.next();
           if(value.getItemId() == currentItemId){
               itemMessages.remove(value);
           }
         }

         //right
         ListIterator<ItemMessage> it = itemMessages.listIterator();
         while (it.hasNext()){
          ItemMessage value = it.next();
          if(value.getItemId() == currentItemId){
              it.remove();// This wil remove the element that we just got using the next() method
              it.add(new ItemMessage());// THis inserts the element immediately before the next call to next()
          }
      }

      adapter.notifyDataSetChanged();
      }
      @Override
      public void failure(RetrofitError error) {
          //handle the error
      }
  }