Flutter SharedPreferences类型“String”不是类型“List<Object>”的子类型

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'dart:convert';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('SharedPreferences Example')),
        body: Center(child: StoreListExample()),
      ),
    );
  }
}

class StoreListExample extends StatefulWidget {
  @override
  _StoreListExampleState createState() => _StoreListExampleState();
}

class _StoreListExampleState extends State<StoreListExample> {
  List<Object> _list = [1, 'two', {'key': 'value'}];

  void _saveList() async {
    final prefs = await SharedPreferences.getInstance();
    final jsonString = jsonEncode(_list);
    await prefs.setString('myList', jsonString);
  }

  List<Object> _loadList() async {
    final prefs = await SharedPreferences.getInstance();
    final jsonString = prefs.getString('myList');
    if (jsonString != null) {
      return jsonDecode(jsonString);
    }
    return [];
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        ElevatedButton(
          onPressed: _saveList,
          child: Text('Save List'),
        ),
        ElevatedButton(
          onPressed: () async {
            final loadedList = await _loadList();
            print('Loaded List: $loadedList');
          },
          child: Text('Load List'),
        ),
      ],
    );
  }
}