Как импортировать библиотеку twoway-view?

В итоге вся магия вот в этих строчках

StaggeredGridLayoutManager.LayoutParams layoutParams =
                (StaggeredGridLayoutManager.LayoutParams) viewHolder.itemView.getLayoutParams();
        layoutParams.setFullSpan(true);

Вот так выглядит мой адаптер

public class AdapterRecViewMain
    extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<BaseMarkerElement> mainCardList;
private final int HEADER_VIEW = 0;
private final int FOOTER_VIEW = 1;
public AdapterRecViewMain() {
}
public void setData(List<BaseMarkerElement> mainCardList) {
    this.mainCardList = mainCardList;
}
@Override public int getItemViewType(int position) {
    if (position == 0) {
        return HEADER_VIEW;
    }
    return FOOTER_VIEW;
}
@Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int type) {
    if (type == FOOTER_VIEW) {
        View v = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.card_main_activity, viewGroup, false);
        return new MainCardViewHolder(v);
    } else {
        View v = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.header_view_main_activity, viewGroup, false);
        return new HeaderViewHolder(v);
    }
}
@Override public void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int positionItem) {
    final int position = viewHolder.getAdapterPosition();
    if (viewHolder instanceof HeaderViewHolder) {
        StaggeredGridLayoutManager.LayoutParams layoutParams =
                (StaggeredGridLayoutManager.LayoutParams) viewHolder.itemView.getLayoutParams();
        layoutParams.setFullSpan(true);
        BaseMarkerElement item = mainCardList.get(position);
        if (item instanceof HeaderView) {
            HeaderView header = (HeaderView) mainCardList.get(position);
            // need to add implementation
        }
    } else if (viewHolder instanceof MainCardViewHolder) {
        MainCardViewHolder currentView = (MainCardViewHolder) viewHolder;
        CardMainActivity currentCard = (CardMainActivity) mainCardList.get(position);
        currentView.ivMainCard.setImageResource(currentCard.getIvMainCard());
        currentView.tvBrandName.setText(currentCard.getTvBrandName());
        currentView.tvPrice.setText(currentCard.getTvPrice());
        currentView.tvType.setText(currentCard.getTvType());
    }
}
@Override public int getItemCount() {
    return mainCardList.size();
}
private class MainCardViewHolder extends RecyclerView.ViewHolder {
    ImageView ivMainCard;
    TextView tvBrandName;
    TextView tvType;
    TextView tvPrice;
    MainCardViewHolder(View view) {
        super(view);
        ivMainCard = (ImageView) view.findViewById(R.id.imageViewMainCard);
        tvBrandName = (TextView) view.findViewById(R.id.tvBrandName);
        tvType = (TextView) view.findViewById(R.id.tvType);
        tvPrice = (TextView) view.findViewById(R.id.tvPrice);
    }
}
private class HeaderViewHolder extends RecyclerView.ViewHolder {
    public HeaderViewHolder(View itemView) {
        super(itemView);
    }
}
}

результат получается такой как на картинке у меня в вопросе