My future method is not working fine, while using flutter builder widget, Where did I go wrong? - flutter

Question

Here is my stateful widget and url is a property pass it to the widget from parent widget. I don't know where did I go wrong?? I created a future builder widget that has getData() as a future. But the print statement inside was not executed ever. Why is that and it returns me always null value, and this results me a red container appearing on screen and not the table widget.
class TimeTable extends StatefulWidget {
final url;
const TimeTable({Key? key,required this.url}) : super(key: key);
#override
_TimeTableState createState() => _TimeTableState();
}
class _TimeTableState extends State<TimeTable> {
Future<List<Train>> getData() async{
final list = await TrainClient(url: widget.url).getName();
print("this line not executed");
return list;
}
#override
Widget build(BuildContext context) {
return Scaffold(body: FutureBuilder(
future: getData(),
builder: (context,projectSnap){
if(projectSnap.connectionState == ConnectionState.none ||
projectSnap.data == null) {
return Container(color: Colors.red,);
}
return buildDataTable(trains: projectSnap.data);
}));
}
}
getData is a future method and it returns a list, The list gets printed when I call that object Train Client. I had my print statement inside TrainClient class to check whether the list is created successfully.
Here is the code of TrainClient
class TrainClient {
final String url;
TrainClient({required this.url});
Future<List<Train>> getName() async {
final uri = Uri.parse(url);
final response = await get(uri);
if (response.statusCode == 200) {
print("ulla");
final data = json.decode(response.body);
final result = data["RESULTS"]["directTrains"]["trainsList"];
final list = result.map((json) => Train.fromJson(json));
print(list);
return list;
}else{
throw Exception();
}
}
}
The TrainClient class has no error since it printed the list successfully as shown below
(Instance of 'Train', Instance of 'Train', Instance of 'Train', ..., Instance of 'Train', Instance of 'Train')

Answer 1

You should always obtain future earlier (in initState/didChangeDependencies).
Each time your build is executed, new future is created. So it never finishes, if your widget rebuilds often.
late final _dataFuture = getData();
...
FutureBuilder(
future: _dataFuture,
builder: (context,projectSnap){
...
}
);