Embedding ads within Recyclerview

In your adapter, you first need to override getItemViewType, for example:

@Override
public int getItemViewType(int position) 
{
    if (position % 5 == 0)
        return AD_TYPE; 
    return CONTENT_TYPE;
}

Then in onCreateViewHolder, inflate a different view according to the type. Something like this:

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) 
{
    View v = null;

    if (viewType == AD_TYPE)
    {
        v = new AdView(activity, AdSize.BANNER, ADMOB_ID);
        float density = activity.getResources().getDisplayMetrics().density;
        int height = Math.round(AdSize.BANNER.getHeight() * density);
        AbsListView.LayoutParams params = new AbsListView.LayoutParams(AbsListView.LayoutParams.FILL_PARENT,height);
        v.setLayoutParams(params);

     AdRequest adRequest = new AdRequest.Builder().build();
        if (adRequest != null && v != null){
            v.loadAd(adRequest);
         }
    }
    else 
        v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_layout, viewGroup, false);

    RecyclerView.ViewHolder viewHolder = new RecyclerView.ViewHolder(v);
    return viewHolder;
}

How to add AD list items and don't skip content items and don't insert null items to content list?

private static final int LIST_AD_DELTA = 3;
private static final int CONTENT = 0;
private static final int AD = 1;

@Override
public int getItemViewType(int position) {
    if (position > 0 && position % LIST_AD_DELTA == 0) {
        return AD;
    }
    return CONTENT;
}

@Override
public BaseRecyclerHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    if (viewType == CONTENT) {
        return new ContentRecyclerHolder(parent, layoutId) {
            @Override
            protected void onCardClick(CardView card) {
                fragmentManager.showPagerFragmentWithTransition(card.getContext(), getRealPosition(getAdapterPosition()));
            }
        };
    } else {
        return new AdRecyclerHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_ad, parent, false));
    }
}

@Override
public int getItemCount() {
    int additionalContent = 0;
    if (data.size() > 0 && LIST_AD_DELTA > 0 && data.size() > LIST_AD_DELTA) {
        additionalContent = data.size() / LIST_AD_DELTA;
    }
    return data.size() + additionalContent;
}

@Override
public void onBindViewHolder(BaseRecyclerHolder baseHolder, int position) {
    if (getItemViewType(position) == CONTENT) {
        ContentRecyclerHolder holder = (ContentRecyclerHolder) baseHolder;
        Content content = data.get(getRealPosition(position));
    } else {
        AdRecyclerHolder holder = (AdRecyclerHolder) baseHolder;
            AdRequest adRequest = new AdRequest.Builder().build();
            if (adRequest != null && holder.adView != null){
                holder.adView.loadAd(adRequest);
             }
    }
}

private int getRealPosition(int position) {
    if (LIST_AD_DELTA == 0) {
        return position;
    } else {
        return position - position / LIST_AD_DELTA;
    }
}

In your ArrayList, add null values to positions you want to show ads

    for(int i=0;i<arr.size();i++){
       if(i%5==0)
       {
         alist.add(null);
       }
       alist.add(arr.get(i));
    }

Then in getItemViewType(),

  @Override
public int getItemViewType(int position) {
   if(qlist.get(position)==null)
       return AD_TYPE;
   return CONTENT_TYPE;
}

Then,

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = null;
    ViewHolder vh=null;
    if (viewType == AD_TYPE)
    {
        v=inflater.inflate(R.layout.adview_item, parent, false);
        vh=new AdviewHolder(v);

    }
    else {
        v = inflater.inflate(R.layout.cardview_items, parent, false);
        vh = new ContentViewHolder(v);
    }
    return vh;
}

This will not skip any items but will insert ads in to required positions.