flutter日常报错之Shared preferences，No implementation found for method getAll on channel plugins.flutter.

MissingPluginException(No implementation found for method getAll on channel plugins.flutter.io/shared_preferences)

今天在使用Shared preferences的时候报错，在main方法前添加一句话并引入包

import 'package:shared_preferences/shared_preferences.dart';
void main() {
  SharedPreferences.setMockInitialValues({});
  runApp(MyApp());
}