1

因此,我正在使用附近的连接 API 来发现我周围的设备并将它们的数据存储在 Firestore 中,但是我不断收到 2 条关于我从与我接触的用户那里获得的位置以及我与他们接触的时间的警告

这是两个警告:

1)DateTime 不是 TimeStamp 类型的子类型

2)未处理的异常:无效的参数:Future<.LocationData.> 的实例,因为我尝试将这些值添加到 firestore

这是我的发现方法:

void discovery() async {
    try {
      bool a = await Nearby().startDiscovery(loggedInUser.email, strategy,
          onEndpointFound: (id, name, serviceId) async {
        print('I saw id:$id with name:$name'); // the name here is an email

        var docRef =
            _firestore.collection('users').document(loggedInUser.email);

        //  When I discover someone I will see their email
        docRef.collection('met_with').document(name).setData({
          'email': await getUsernameOfEmail(email: name),
          'contact time': DateTime.now() as Timestamp ,
          'contact location': location.getLocation(),
        });
      }, onEndpointLost: (id) {
        print(id);
      });
      print('DISCOVERING: ${a.toString()}');                                                      
    } catch (e) {
      print(e);
    }
  }

这是我检索从 Firestore 中发现的信息的另一种方法:

void addContactsToList() async {
    await getCurrentUser();
    _firestore
        .collection('users')
        .document(loggedInUser.email)
        .collection('met_with')
        .snapshots()
        .listen((snapshot) {

   for (var doc in snapshot.documents) {
        String currEmail = doc.data['email'];
        DateTime currTime = doc.data.containsKey('contact time')
            ? (doc.data['contact time'] as Timestamp).toDate()
            : null;
        String currLocation = doc.data.containsKey('contact location')
            ? doc.data['contact location']
            : null;
        String _infection = doc.data['infected'];
        if (!contactTraces.contains(currEmail)) {
          contactTraces.add(currEmail);
          contactTimes.add(currTime);
          contactLocations.add(currLocation);
          infection.add(_infection);
        }
      }
      setState(() {});
      print(loggedInUser.email);
    });
  }

请问有什么办法解决吗?

4

1 回答 1

1

使用异步函数将 Future<.LocationData.> 转换为 LocationData。

     var data;
 void convertData() async{
 var futuredata = await FutureLocationData;

 setState(() {
  data = futuredata   });
 }
于 2020-05-15T06:33:29.113 回答