Update data from a RecyclerView - AndroidStudio

I am having to create a database and display it later in a RecyclerView. I register my clients in one activity and show them in another. The problem is that when I register my clients, it does not immediately appear on the other activity, I have to close the App and open it again to update.

Here is my code:

package com.bancodedados.bancodedados;

import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.bancodedados.bancodedados.dominio.entidades.cliente;

import java.util.List;

/**
 * Created by vande on 28/03/2018.
 */

public class ClienteAdapter extends RecyclerView.Adapter<ClienteAdapter.ViewHolderCliente>{



    private List<cliente> dados;

    public ClienteAdapter(List<cliente> dados){

        this.dados = dados;

    }


    @Override
    public ClienteAdapter.ViewHolderCliente onCreateViewHolder(ViewGroup parent, int viewType) {

        LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());

        View view = layoutInflater.inflate(R.layout.linha_clientes,parent,false);

        ViewHolderCliente holderCliente = new ViewHolderCliente(view);

        return holderCliente;
    }

    @Override
    public void onBindViewHolder(ClienteAdapter.ViewHolderCliente holder, int position) {


        if ((dados != null) && (dados.size()>0)) {

            cliente Cliente = dados.get(position);

            holder.txtNome.setText(Cliente.nome);
            holder.txtTelefone.setText(Cliente.telefone);

        }


    }

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

    public class ViewHolderCliente extends RecyclerView.ViewHolder{

        public TextView txtNome;
        public TextView txtTelefone;

        public ViewHolderCliente(View itemView) {
            super(itemView);

            txtNome = itemView.findViewById(R.id.txtNome);
            txtTelefone = itemView.findViewById(R.id.txtTelefone);
        }
    }

}

If anyone can help me I would be grateful. I tried to use notifyDataSetChanged() but could not.