JsonObjectRequest jsonObjReq= new JsonObjectRequest(Method.GET, urlPedido, null, new Response.Listener<JSONObject>(){
            @Override
            public void onResponse(JSONObject response) {
                //para convertir JSON a objeto:
                Empleado emp= gson.fromJson(response, Empleado.class);
                txtDireccion.setText("Address: "+emp.getAddress());
                txtTipoSangre.setText("BloodGroup: "+emp.getBloodGroup());
                txtCodigoEmpleado.setText("EmployeeId: "+emp.getEmployeeId());
                txtNombre.setText("FirstName: "+emp.getFirstName());
                txtApellido.setText("LastName: "+emp.getLastName());
                txtError.setText("");
            }//Fin onResponse
        }, new Response.ErrorListener(){
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG,"Error: "+error.getMessage());
                txtError.setText("Error no se encuentra ");
            }
        });
        //agregar el request a la cola de request
        Volley.newRequestQueue(getApplicationContext()).add(jsonObjReq);