共享首选项Dart-InternalLinkedHashMap'；不是类型为'；地图'；

在尝试整合共享偏好时，我遇到了以下问题。我是飞镖初学者

Unhandled exception:
[        ] E/flutter (24504): type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, Object>' where
[        ] E/flutter (24504):   _InternalLinkedHashMap is from dart:collection
[        ] E/flutter (24504):   Map is from dart:core
[        ] E/flutter (24504):   String is from dart:core
[        ] E/flutter (24504):   Object is from dart:core
[        ] E/flutter (24504): 
[        ] E/flutter (24504): #0      SharedPreferences.getInstance (package:shared_preferences/shared_preferences.dart)
[        ] E/flutter (24504): <asynchronous suspension>
[        ] E/flutter (24504): #1      AuthManager.init (package:apms_timesheet/data/user/auth_manager.dart:25:55)
[        ] E/flutter (24504): <asynchronous suspension>
[        ] E/flutter (24504): #2      _SplashState._init (package:apms_timesheet/ui/splash/splash_screen.dart:36:24)
[        ] E/flutter (24504): <asynchronous suspension>
[        ] E/flutter (24504): #3      _SplashState.initState (package:apms_timesheet/ui/splash/splash_screen.dart:32:5)

来自auth_manager.dart的代码段

Future init() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String username = prefs.getString(KEY_USERNAME);
    String oauthToken = prefs.getString(KEY_OAUTH_TOKEN);

    if (username == null || oauthToken == null) {
      _loggedIn = false;
      await logout();
    } else {
      _loggedIn = true;
      _username = username;
    }

    _initialized = true;
  }

---

您使用的颤振版本（

flatter doctor

）和

shared_preferences

（签入

pubspec.lock

）是什么？我希望在@GünterZöchbauer Dart 2.0和颤振v0.3.0中修复

Future init() async {
    SharedPreferences prefs = await SharedPreferences.getInstance();
    String username = prefs.getString(KEY_USERNAME);
    String oauthToken = prefs.getString(KEY_OAUTH_TOKEN);

    if (username == null || oauthToken == null) {
      _loggedIn = false;
      await logout();
    } else {
      _loggedIn = true;
      _username = username;
    }

    _initialized = true;
  }