FutureBuilder小部件仅使用Firebase RealtimeDatabase返回“DataSnapshot”实例

我无法将FutureBuilder和StreamBuilder小部件与Firebase RealTimeDatabase一起使用。我多次尝试在RealTimeDatabase中检索每次以调试打印方式返回的数据

ConnectionState.done值是“DataSnapshot”的实例

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您正在获取数据快照的实例，因此只需添加.value即可

      FutureBuilder(
      initialData: 1,
      future: FirebaseDatabase.instance.reference().child('hello').once(),
      builder: (BuildContext context, AsyncSnapshot snapshot) {
        print(snapshot);
        return Text(snapshot.data.toString());
      },
    ),

 FutureBuilder(
  initialData: 1,
  future: FirebaseDatabase.instance.reference().child('hello').once(),
  builder: (BuildContext context, AsyncSnapshot snapshot) {
    print(snapshot);
    return Text(snapshot.data.value.toString());//just add value here
  },
),