How to call dynamic method in widget - flutter

Question

I'm new to flutter. I'm using SharedPreferences to store data. I have this dynamic function:

 _loadFromLocal(index) async {
    var data = await getFromLocal();
    return data?.elementAt(index);
  }

 Future<List<String>?> getFromLocal() async {
    SharedPreferences pref = await SharedPreferences.getInstance();
    return pref.getStringList('data_prices');
  }

I need to call this dynamic fucntion _loadFromLocal in Widget build

    class _ScanState extends State<Scan> {
    @override
      Widget build(BuildContext context) {
           return
     Scaffold(
         child: Container(
        child:Text(
        _loadFromLocal(0),
        )),);
  }
  }

How can I do that

Answer 1

You can't call async code as you mentioned, instead you should call it in initState() like below

class _ScanState extends State<Scan> {
  dynamic value;

  @override
  void initState() {
    super.initState();
    _loadFromLocal(0).then((data) {
      setState(() {
        value = data;
      });
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Text(
          value ?? '',
        ),
      ),
    );
  }

  // omit the rest code
}