Clean Recycler Adapter (also see https://github.com/sockeqwe/AdapterDelegates)

AdArbitraryCell.java

public class AdArbitraryCell implements ArbitraryCellSelector.Cell {

    @Override
    public boolean is(Object item) {
        return item instanceof AdVo;
    }

    @Override
    public int type() {
        return R.layout.cell_ad;
    }

    @Override
    public RecyclerView.ViewHolder holder(ViewGroup parent) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());
        View view = inflater.inflate(R.layout.cell_ad, parent, false);
        return new AdViewHolder(view);
    }

    @Override
    public void bind(RecyclerView.ViewHolder holder, Object item) {
        try {
            AdViewHolder adViewHolder = (AdViewHolder) holder;
            AdVo ad = (AdVo) item;
            adViewHolder.bind(ad);
        } catch (ClassCastException e) {
            L.printStackTrace(e);
        }
    }

    protected class AdViewHolder extends ArbitraryCellHolder<AdVo> {
        @BindView(R.id.ad_text_view)
        protected TextView adTextView;

        public AdViewHolder(View itemView) {
            super(itemView);
        }

        @Override
        public void bind(AdVo item) {
            adTextView.setText(item.getTitle());

            itemView.setOnClickListener(view -> adPublishSubject.onNext(item));
        }
    }
}

ArbitraryCellAdapter.java

public abstract class ArbitraryCellAdapter
		extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    protected ArbitraryCellSelector arbitraryCellSelector = new ArbitraryCellSelector();
    protected List itemList = new ArrayList();

    @Override
    public final int getItemViewType(int position) {
        return arbitraryCellSelector.getCell(itemList.get(position)).type();
    }

    @Override
    public final RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return arbitraryCellSelector.getCell(viewType).holder(parent);
    }

    @Override
    public final void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        Object item = itemList.get(position);
        arbitraryCellSelector.getCell(item).bind(holder, item);
    }

    @Override
    public final int getItemCount() {
        return itemList.size();
    }
}

ArbitraryCellHolder.java

public abstract class ArbitraryCellHolder<T> extends RecyclerView.ViewHolder {

    public ArbitraryCellHolder(View itemView) {
        super(itemView);
        ButterKnife.bind(this, itemView);
    }

    public abstract void bind(T item);
}

ArbitraryCellSelector.java

public final class ArbitraryCellSelector {
    private List<Cell> cellList = new ArrayList<>();

    public void addCell(Cell cell) {
        cellList.add(cell);
    }

    public void removeCell(Cell cell) {
        cellList.remove(cell);
    }

    public Cell getCell(Object item) {
        for (Cell cell : cellList) {
            if (cell.is(item)) {
                return cell;
            }
        }
        throw new NoSuchRecyclerRowException();
    }

    public Cell getCell(int viewType) {
        for (Cell cell : cellList) {
            if (cell.type() == viewType) {
                return cell;
            }
        }
        throw new NoSuchRecyclerRowException();
    }

    public interface Cell {

        boolean is(Object item);

        int type();

        RecyclerView.ViewHolder holder(ViewGroup parent);

        void bind(RecyclerView.ViewHolder holder, Object item);
    }
}

UsersArbitraryCellAdapter.java

public class UsersArbitraryCellAdapter extends ArbitraryCellAdapter {

    public UsersArbitraryCellAdapter() {
        this.arbitraryCellSelector.addCell(new ProgressArbitraryCell());
        this.arbitraryCellSelector.addCell(new AdArbitraryCell());
        this.arbitraryCellSelector.addCell(new UserArbitraryCell());
    }

    public void setUsers(List<UserVo> userList) {
		// Set users, ads, progress...
    }
}