如何解决flutter中“初始化时只能访问静态成员”的问题？

late String myVariable;

void initState() {
  super.initState();
  myVariable = "Initialized value";
}

Widget build(BuildContext context) {
  return Text(myVariable);
}

Future<String> fetchData() async {
  // 异步获取数据
  return "Fetched data";
}

Widget build(BuildContext context) {
  return FutureBuilder<String>(
    future: fetchData(),
    builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
      if (snapshot.connectionState == ConnectionState.waiting) {
        return CircularProgressIndicator();
      } else if (snapshot.hasError) {
        return Text('Error: ${snapshot.error}');
      } else {
        return Text('Data: ${snapshot.data}');
      }
    },
  );
}