Problem with RecyclerView adapter

I have a reservation RecyclerView loaded from an adapter, the final result is the image that I place below:

The problem is that when wanting to select an option like 'View Detail' I can not obtain the data of the reserve entity and from its id look for the details of it. Next, the adapter code

public class MisReservasAdapter extends RecyclerView.Adapter<MisReservasAdapter.ViewHolder> {

private List<ReservasApi> list;
private View.OnClickListener listener;


public MisReservasAdapter(List<ReservasApi> list, Context mCtx, View.OnClickListener listener) {
    this.list = list;
    Context mCtx1 = mCtx;
    this.listener = listener;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.rv_reservas, parent, false);
    return new ViewHolder(v);
}

@Override
public void onBindViewHolder(final MisReservasAdapter.ViewHolder holder, int position) {
    ReservasApi myList = list.get(position);

    holder.txtEstado.setText(myList.getEstado());

    int idEstado = myList.getIdEstado();

    if(idEstado==2){
        holder.imgEstado.setImageResource(R.drawable.ic_confirm);
    }else if(idEstado == 5){
        holder.imgEstado.setImageResource(R.drawable.ic_cancel);
    }

    holder.txtFecha.setText(myList.getFechaReserva());

    holder.buttonViewOption.setOnClickListener(listener);
}

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


public class ViewHolder extends RecyclerView.ViewHolder {

    @BindView(R.id.txtEstado)
    public TextView txtEstado;
    @BindView(R.id.txtFecha)
    public TextView txtFecha;
    @BindView(R.id.txtOptions)
    public TextView buttonViewOption;
    @BindView(R.id.imgEstado)
    public ImageView imgEstado;

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

Then the adapter instance is created in the onPostExecute of an AsyncTask

      protected void onPostExecute(String s) {
        if (!TextUtils.isEmpty(s)) {
            // forma 1
            Type listType = new TypeToken<ArrayList<ReservasApi>>() {
            }.getType();
            final List<ReservasApi> reservas = new Gson().fromJson(s, listType);

            adapter = new MisReservasAdapter(reservas, getContext(), new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    //creating a popup menu
                    PopupMenu popup = new PopupMenu(getContext(), v);
                    //inflating menu from xml resource
                    popup.inflate(R.menu.options_reservas);
                    //adding click listener
                    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                        @Override
                        public boolean onMenuItemClick(MenuItem item) {
                            switch (item.getItemId()) {
                                case R.id.VerDetalle:
                                    new GetDetalleReserva().execute(3051);
                                    break;
                                case R.id.Cancelar:
                                    Toast.makeText(getContext(),"Cancelar todo esto",Toast.LENGTH_LONG).show();
                                    break;
                            }
                            return false;
                        }
                    });
                    popup.show();
                }
            });
            recyclerView.setAdapter(adapter);

        } else {
            Toast.makeText(getContext(), "Ha ocurrido un error", Toast.LENGTH_LONG).show();
        }
    }