Flutter Firebase中Facebook登录后读取Google Fitness API睡眠数据问题

我们基于Flutter开发一款睡眠数据仪表盘应用，通过Firebase实现社交登录，支持谷歌、Facebook及邮箱/密码三种登录方式。

谷歌登录正常情况 #

使用谷歌账号登录时，应用可正常获取睡眠数据，我们通过在GoogleSignIn中传入权限范围实现：

FirebaseAuth.instance, UserRepository(), GoogleSignIn(scopes:[
'https://www.googleapis.com/auth/fitness.sleep.read',
])),

Facebook登录后的错误 #

使用Facebook登录时，读取睡眠数据会持续抛出如下错误，核心困惑是不知道如何在Facebook登录流程中传入Google API权限范围：

W/FLUTTER_HEALTH::ERROR(31643): There was an error getting the sleeping data!
W/FLUTTER_HEALTH::ERROR(31643): 4: The user must be signed in to make this API call.
W/FLUTTER_HEALTH::ERROR(31643): [Ljava.lang.StackTraceElement;@7eb1aa0
W/FLUTTER_HEALTH::ERROR(31643): There was an error getting the sleeping data!
W/FLUTTER_HEALTH::ERROR(31643): 4: The user must be signed in to make this API call.
W/FLUTTER_HEALTH::ERROR(31643): [Ljava.lang.StackTraceElement;@ef740cc
W/FLUTTER_HEALTH::ERROR(31643): There was an error getting the sleeping data!
W/FLUTTER_HEALTH::ERROR(31643): 4: The user must be signed in to make this API call.
W/FLUTTER_HEALTH::ERROR(31643): [Ljava.lang.StackTraceElement;@abd9db8

当前读取睡眠数据的代码 #

Future fetchSleepData() async {
     List<HealthDataPoint> _healthDataList = [];
    final types = [
      HealthDataType.SLEEP_ASLEEP,
      HealthDataType.SLEEP_AWAKE,
      HealthDataType.SLEEP_IN_BED
    ];

    final permissions = [
      HealthDataAccess.READ,
      HealthDataAccess.READ,
      HealthDataAccess.READ
    ];
    final now = DateTime.now();
    final yesterday = now.subtract(Duration(days: 10));
    HealthFactory health = HealthFactory();
    bool requested =
        await health.requestAuthorization(types, permissions: permissions);
    await Permission.activityRecognition.request();
    await Permission.location.request();
    if (requested) {
      try {
        // fetch health data
        List<HealthDataPoint> healthData =
            await health.getHealthDataFromTypes(yesterday, now, types);
        // save all the new data points (only the first 100)
        _healthDataList.addAll((healthData.length < 100)
            ? healthData
            : healthData.sublist(0, 100));
      } catch (error) {
        print("Exception in getHealthDataFromTypes: $error");
      }
      // filter out duplicates
      _healthDataList = HealthFactory.removeDuplicates(_healthDataList);
      // print the results
      _healthDataList.forEach((x) => print(x));
    }
  }

解决方案建议 #

1. 核心逻辑明确
   Google Fitness API仅接受Google账号的OAuth 2.0令牌认证，Facebook登录的凭证无法直接用于调用该API。无论用户用哪种方式登录Firebase，要读取Google睡眠数据，都需要额外完成Google账号的授权流程。

2. 具体实现步骤

   • 当用户通过Facebook/邮箱登录后，首次进入睡眠数据页面时，触发Google账号授权流程，传入fitness.sleep.read权限范围。
   • 授权成功后，确保HealthFactory使用Google的认证令牌进行API调用。

3. 代码调整示例
   在fetchSleepData执行前，先检查并获取Google授权：

   final GoogleSignIn _googleSignIn = GoogleSignIn(scopes: [
     'https://www.googleapis.com/auth/fitness.sleep.read',
   ]);
   
   Future<void> ensureGoogleAuth() async {
     if (!await _googleSignIn.isSignedIn()) {
       await _googleSignIn.signIn();
     }
   }
   

   调用顺序调整为：先执行ensureGoogleAuth()，再执行fetchSleepData()。

4. 用户体验优化
   在Facebook登录后首次访问睡眠数据时，添加明确提示，告知用户需要关联Google账号以获取睡眠数据，避免授权弹窗过于突兀。

内容的提问来源于stack exchange，提问作者Ramesh Angamuthu