private void removeMoreGameAd() {
   if (moreGameAd != null) {
     moreGameAd.setAdListener(null);
     moreGameAd.destroy();
     moreGameAd = null;
   }
 }
 private void showMoreGameAd(final String adId) {
   removeMoreGameAd();
   moreGameAd = new MoreGameAd(context);
   moreGameAd.setPublisherId(appId);
   moreGameAd.setAdListener(this);
   moreGameAd.loadAd(new AdRequest());
 }