Meu recycler view não apresenta os itens na tela

Setei o adaptar e o layout manager mas o recycler view esta em branco. Não encotro o erro.

• ListaNotasActivity

package shivao.apps.ceep.ui.activity;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.os.Bundle;

import java.util.List;

import shivao.apps.ceep.R;
import shivao.apps.ceep.dao.NotaDAO;
import shivao.apps.ceep.model.Nota;
import shivao.apps.ceep.ui.recycler.adapter.ListaNotasAdapter;

public class ListaNotasActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_lista_notas);

        RecyclerView listaNotas = findViewById(R.id.lista_notas_recyclerview);
        NotaDAO dao = new NotaDAO();

        for (int i=0; i <10000; i++){
            dao.insere(new Nota("Título " + i,
                    "Descrição " + i));
        }

        List<Nota> todasNotas = dao.todos();

        listaNotas.setAdapter(new ListaNotasAdapter(this, todasNotas));
        listaNotas.setLayoutManager(new LinearLayoutManager(this));

    }
}

• ListaNotasAdapter

package shivao.apps.ceep.ui.recycler.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.List;

import shivao.apps.ceep.R;
import shivao.apps.ceep.model.Nota;

public class ListaNotasAdapter extends RecyclerView.Adapter<ListaNotasAdapter.NotaViewHolder> {

    private List<Nota> notas;
    private Context context;

    public ListaNotasAdapter(Context context, List<Nota> notas) {
        this.context = context;
        this.notas = notas;
    }

    @NonNull
    @Override
    public NotaViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View viewCriada = LayoutInflater.from(context).
                inflate(R.layout.item_nota, parent, false);
        return new NotaViewHolder(viewCriada);
    }


    @Override
    public void onBindViewHolder(@NonNull NotaViewHolder holder, int position) {
        Nota nota = notas.get(position);
        TextView titulo = holder.itemView.findViewById(R.id.item_nota_titulo);
        titulo.setText(nota.getTitulo());
        TextView descricao = holder.itemView.findViewById(R.id.item_nota_descricao);
        descricao.setText(nota.getDescricao());
    }

    @Override
    public int getItemCount() {
        return 0;
    }

    class NotaViewHolder extends RecyclerView.ViewHolder{

        public NotaViewHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
}