getItemViewType不能按预期工作

Question

我试图创建一个RecycleView来显示更多对象，但是由于某种原因，funcion getItemViewType不起作用，或者它可能起作用，但是仅选择第二个选项是因为onCreateViewHolder的输出始终是第一个选项。

这是方法中的功能

private void insertObjects(){
            items.add(new Object(1));
            items.add(new Object(2));

            mMultiAdapter.notifyDataSetChanged();

这是适配器
即使我先将getItemViewType的if更改为if（position％2 == 0）>也会每次输出相同的选项

public class MultiAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
    public MultiAdapter(List<Object> Parts) { this.items = Parts; }

    public static class ChestViewHolder extends RecyclerView.ViewHolder{
TextView second_segment;

        private ChestViewHolder( View itemView) {
            super(itemView);
            second_segment = itemView.findViewById(R.id.segment_tuesday);

        }
public static class BackViewHolder extends RecyclerView.ViewHolder {
        TextView first_segment;

        private BackViewHolder( View itemView) {
            super(itemView);
            first_segment = itemView.findViewById(R.id.segment_monday);

        }
public static class DefaultViewHolder extends RecyclerView.ViewHolder {
        TextView default_segment;

        private DefaultViewHolder( View itemView) {
            super(itemView);
            default_segment = itemView.findViewById(R.id.segment_sunday);
        }
    }
    private static int ITEM_TYPE_C_T;
    private static int ITEM_TYPE_S_B;

    private List<Object> items = new ArrayList<>();

@Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder Holder, int position) {non code inside of this method}

    @Override
        public int getItemViewType(int position) {
            if (items.get(position).getId()== 1){ 
                return ITEM_TYPE_C_T;
            }
            else if(items.get(position).getId()== 2){
                return ITEM_TYPE_S_B;
            }else {
                return ITEM_TYPE_C_T;//(DEFAULT)
            }
        }

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

    @NonNull
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());

            if (viewType == ITEM_TYPE_S_B){
                View view = layoutInflater.inflate(R.layout.segment_nOne,parent,false);
                return new BackViewHolder(view);
            } else if(viewType == ITEM_TYPE_C_T) {
                View view = layoutInflater.inflate(R.layout.segment_nTwo,parent,false);
                return new ChestViewHolder(view);
            }else{
                //to prevent crash on null
                View view = layoutInflater.inflate(R.layout.nOne,parent,false);
                return new DefaultViewHolder(view);
            }
        }

这是对象

public class Object {
    private int id;

    public Object(){ }

    public Object(int id){
        this.id = id;
    }

    public int getId(){
        return id;
    }

谢谢你的帮助