type '(BuildContext) => Future<void>' is not a subtype of type '() => void' #46595
Comments
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Hi @daniele777 @override
Widget build(BuildContext context) {
MaterialApp(
home: Scaffold(try adding @override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(This platform is not meant for assistance on personal code. |
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Unfornunally same problem...another idea??? |
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Solve issue thx |
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Hi @daniele777 |
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Hy guys my code… class chiese {
final String nome;
final double x;
final double y;
final String imaggine;
final String info;
chiese({this.nome, this.x, this.y, this.imaggine, this.info});
factory chiese.fromJson(Map<String, dynamic> json) {
return new chiese(
nome: json[‘nome’] as String,
x: json[‘x’] as double,
y: json[‘y’] as double,
imaggine: json[‘imaggine’] as String,
info: json[‘info’] as String,
);
}
}
Future _loadAStudentAsset() async {
return await rootBundle.loadString(‘assets/json/chiese.json’);
}
Future loadStudent() async {
await wait(5);
String jsonString = await _loadAStudentAsset();
final jsonResponse = json.decode(jsonString);
}
Future wait(int seconds) {
return new Future.delayed(Duration(seconds: seconds), () => {});
}
class _FirstScreen extends State {
BitmapDescriptor pinLocationIcon;
chiese _chiese;
@override
void initState(){
super.initState();
loadStudent().then((s) => setState(() {
_chiese = s;
_loaded = true;
_addchiese();
}));
_addchiese() async {
await wait(5);
String jsonString = await _loadAStudentAsset();
final jsonResponse = json.decode(jsonString);
for ( var i=0; i < 8; i++ ){
new chiese.fromJson(jsonResponse[i]);
print(jsonResponse[i]);
int _markerIdCounter= 0;
final String markerIdVal = 'marker_id_$_markerIdCounter';
_markerIdCounter++;
final MarkerId markerId = MarkerId(markerIdVal);
final Marker marker = Marker(
position: LatLng(_chiese.y, _chiese.x),
icon: pinLocationIcon,
/*
infoWindow:
InfoWindow(title: “Informazioni”, snippet: _chiese.nome+"\n"+_chiese.info),
*/
markerId: markerId,
);
setState(() {
// adding a new marker to map
markers[markerId] = marker;
});
}
}
But only first row of Json file was readed… any idea??? Json file have 20 rows- like this
[{“nome”: “Chiesa SAN MARTINO”,“x”: 12.887840,“y”: 42.2059400,“imaggine”:"",“info”:""},
{“nome”:“Chiesa VICTORIA”,“x”: 12.870703,“y”: 42.226254,“imaggine”:"",“info”:""}] |
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Whit my code show only firts {. } Row of json and Vector not ho ahead ...and only One marker i saw ...at second Return null |
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Hi @daniele777 Please see https://flutter.dev/community for resources for asking questions like this, |
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My part of code where error should be generated...
code sample
help!
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