code: public Object getItem(int position) {
  
          if (AdapterCalculator.canShowAdAtPosition(position, adFetcher.getFetchedAdsCount())) {
              int adPos = AdapterCalculator.getAdIndex(position);
              return adFetcher.getAdForIndex(adPos);
          }
          else return null;
      }
docs: Gets the item in a given position in the dataset. If an ad is to be returned,
  a {@link NativeAd} object is returned.
  
  
  @return the object or ad contained in this adapter position