private void addNativeExpressAds(){
  for (int i=0; i <= mRecyclerViewItems.size(); i+=ITEMS_PER_AD) {
    final NativeExpressAdView adView=new NativeExpressAdView(MainActivity.this);
    mRecyclerViewItems.add(i,adView);
  }
}

private void addNativeExpressAds ( ) { for ( int i = 0 ; i <= mRecyclerViewItems . size ( ) ; i += ITEMS_PER_AD ) { final NativeExpressAdView adView = new NativeExpressAdView ( MainActivity . this ) ; mRecyclerViewItems . add ( i , adView ) ; } }
adds native express ads to the items list .
