How to send arguments to another screen? Flutter - json

Question

I am trying to send the arguments of a "participant" to another screen, I could do it with a ListView and load the list of events, but it is not working in the same way with the participants, now if the list works, but when I tap and I want to see the info of the "participant" everything comes out in null:
In this part I create the participant and generate the list to be able to visualize it, and by giving the tap I send the info of this (according to me)
Widget _crearListadoParticipantes() {
return FutureBuilder<List<Participantes>>(
future: eventosProvider.cargarParticipantes(evento, participantes),
builder: (context, snapshot) {
if ( snapshot.hasData ) {
final participantes = snapshot.data;
return ListView.builder(
itemCount: participantes.length,
itemBuilder: (context, i) {
return _crearParticipante(context, participantes[i], evento);
}
);
} else if (snapshot.hasError){
return Center(child: Text("${snapshot.error}"));
} else {
return Center( child: CircularProgressIndicator());
}
},
);
}
Widget _crearParticipante(BuildContext context, Participantes participantes, EventoModel evento) {
return Padding(
padding: EdgeInsets.all(12.0),
child: GestureDetector(
child: RichText(
softWrap: false,
text: TextSpan(
style: TextStyle(
color: Colors.black,
fontFamily: "Lato_LightItalic",
fontStyle: FontStyle.italic,
fontSize: 20.0,
fontWeight: FontWeight.w400
),
children: [
TextSpan(text: ' '+'${participantes.numero}',
style: TextStyle(
fontWeight: FontWeight.w600
)
),
TextSpan(text: " "),
TextSpan(text: '${participantes.apellido} ${participantes.nombre}',)
],
),
),
onTap: () => Navigator.pushNamed(context, 'destalleParticipante', arguments: evento),
),
);
}
And this is where I am supposed to receive the arguments of the participant to whom I tapped, but as I say, a null returns
class DetalleParticipante extends StatefulWidget {
#override
_DetalleParticipanteState createState() => _DetalleParticipanteState();
}
class _DetalleParticipanteState extends State<DetalleParticipante> {
final eventosProvider = new EventosProvider();
EventoModel evento = new EventoModel();
Participantes participantes = new Participantes();
#override
Widget build(BuildContext context) {
final EventoModel eventoData = ModalRoute.of(context).settings.arguments;
if ( eventoData != null ) {
evento = eventoData;
}
print(participantes.nombre);
return Scaffold(
appBar: PreferredSize(
preferredSize: Size.fromHeight(0),
child: AppBar(
backgroundColor: Color(0xFF249FE2),
),
),
backgroundColor: Colors.white,
body: Container(
color: Colors.white,
child: Column(
children: <Widget>[
_encabezadoParticipante(context, AssetImage("assets/icon/info_corredor.png"), participantes, evento),
],
),
),
);
}
Widget _backBottom() {
return FloatingActionButton(
elevation: 0.0,
backgroundColor: Colors.white,
child: Icon(
Icons.arrow_back,
size: 45.0,
color: Colors.black,
),
onPressed: (){
Navigator.pop(context);
},
);
}
Widget _encabezadoParticipante(BuildContext context, AssetImage image, Participantes participantes, EventoModel evento) {
return Container(
color: Colors.grey[600],
child: Padding(
padding: const EdgeInsets.all(10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
_backBottom(),
Flexible(
child: Padding(
padding: EdgeInsets.all(8.0),
child: Text('${participantes.apellido}',
textAlign: TextAlign.center,
maxLines: 3,
softWrap: true,
style: TextStyle(
color: Colors.white,
fontFamily: "Lato",
fontStyle: FontStyle.italic,
fontSize: 30.0,
fontWeight: FontWeight.bold
),
),
),
),
Image(image: image,
fit: BoxFit.cover,
),
],
),
),
);
}
}