public class MultiViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
      private List<BaseModel> feedItems;
      private LayoutInflater inflater;

/*
* define a constant for identify better
* */
final int USER=0;
final int RECT_HEADER=1;

  //============================================ initialise //
      MultiViewAdapter(Context context) {
                      feedItems = new ArrayList<>();
                      inflater = LayoutInflater.from(context);
                  }

  //============================================ Setter Getter//
     public void setFeedItems(List<BaseModel> feedItems) {
           this.feedItems = feedItems;
                notifyDataSetChanged();
       }

      @Override
       public int getItemCount() {
           return feedItems==null?0:feedItems.size();
      }
            
   //============================================ Get View type according to view Item//
    @Override
    public int getItemViewType(int position) {

    BaseModel baseModel = feedItems.get(position);
    if (baseModel instanceof User) {
        return USER;
    }
    else if (baseModel instanceof RectHeader) {
        return RECT_HEADER;
    }
    return 0;

}

  //============================================ Get view holder accorcing to view type //
      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
          switch (viewType) {
              case USER:
                  return new UserViewHolder(inflater.inflate(R.layout.item_layout_user, parent, false));
              case RECT_HEADER:
                  return new RectHeaderHolder(inflater.inflate(R.layout.item_layout_rect_header, parent, false));
             }

    return new UserViewHolder(inflater.inflate(R.layout.item_layout_user, parent, false));

}
  //============================================ Bind view accorcing to view holder //
      @Override
      public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
          switch (holder.getItemViewType()) {
              case USER:
                  final User user = (User) feedItems.get(position);
                  final UserViewHolder userViewHolder = (UserViewHolder) holder;
                  userViewHolder.userImage.setImageResource(user.getImage());
                  userViewHolder.userName.setText(user.getName());
                  break;

              case RECT_HEADER:
                  final RectHeader rectHeader = (RectHeader) feedItems.get(position);
                  final RectHeaderHolder rectHeaderHolder = (RectHeaderHolder) holder;
                  rectHeaderHolder.tvRectHeader.setText(rectHeader.getRectHeaderName());
                  rectHeaderHolder.bgView.setBackgroundColor(rectHeader.getRectHeaderBgColorCode());
                  break;

    }
       
}

// define all view holder here
  //============================================//

public class UserViewHolder extends RecyclerView.ViewHolder {
    public TextView userName;
    public ImageView userImage;
    public UserViewHolder(View view) {
        super(view);
        userImage = view.findViewById(R.id.img_image_name);
        userName = view.findViewById(R.id.tv_user_name);
    }
}

//============================================//

public class RectHeaderHolder extends RecyclerView.ViewHolder {
    public TextView tvRectHeader;
    public View bgView;
    public RectHeaderHolder(View view) {
        super(view);
        bgView = view;
        tvRectHeader = view.findViewById(R.id.tv_rect_header);
    }
}

  private void createAdapter(){
    baseItemAdapter = new BaseItemAdapter();
        
    baseItemAdapter.addDelegate(new UsersAdapter());
    baseItemAdapter.addDelegate(new MoviesAdapter());
    baseItemAdapter.addDelegate(new HeaderAdapter());
    baseItemAdapter.addDelegate(new RectHeaderAdapter());
    baseItemAdapter.addFeedItems(getPreparedItemDate());
}