flutter在更改类列表中的数据后刷新obs列表

import 'package:flutter/material.dart';

class MyDataList extends StatefulWidget {
  @override
  _MyDataListState createState() => _MyDataListState();
}

class _MyDataListState extends State<MyDataList> {
  List<String> dataList = ['Item 1', 'Item 2', 'Item 3'];
  List<Widget> obsList = [];

  @override
  void initState() {
    super.initState();
    updateObsList();
  }

  void updateObsList() {
    obsList.clear();
    for (String item in dataList) {
      obsList.add(Text(item));
    }
  }

  void changeDataList() {
    setState(() {
      dataList = ['Item 4', 'Item 5', 'Item 6'];
      updateObsList();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Data List'),
      ),
      body: ListView.builder(
        itemCount: obsList.length,
        itemBuilder: (context, index) {
          return obsList[index];
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: changeDataList,
        child: Icon(Icons.refresh),
      ),
    );
  }
}

void main() {
  runApp(MaterialApp(
    home: MyDataList(),
  ));
}