如何在每次更新共享首选项时更新FutureBuilder文本

dependencies:
  shared_preferences: ^2.0.7

import 'package:shared_preferences/shared_preferences.dart';

Future<SharedPreferences> _getSharedPreferences() async {
  return await SharedPreferences.getInstance();
}

FutureBuilder<SharedPreferences>(
  future: _getSharedPreferences(),
  builder: (BuildContext context, AsyncSnapshot<SharedPreferences> snapshot) {
    if (snapshot.connectionState == ConnectionState.waiting) {
      return Text('Loading...'); // 正在加载共享首选项
    } else if (snapshot.hasError) {
      return Text('Error: ${snapshot.error}'); // 加载共享首选项时出错
    } else {
      final sharedPreferences = snapshot.data!;
      final sharedValue = sharedPreferences.getString('key'); // 获取共享首选项的值
      return Text('Shared Value: $sharedValue'); // 显示共享首选项的值
    }
  },
);