我在StreamBuilder中有一个Listview.builder（）。在Listview builder中，我需要为Firestore中的每个项目获取数据，然后显示数据。但是因为查看数据库是一个Future操作，所以我需要await方法来等待数据并在之后显示。
这是我的代码，我在两个不同的类中创建。
头等舱：

StreamBuilder getFriends() {
  return StreamBuilder(
    stream: FirebaseFirestore.instance
        .collection("Users")
        .doc(AuthFunc().currentUser!.uid)
        .snapshots(),
    builder: (context, snapshot) {
      if (snapshot.connectionState == ConnectionState.active) {
        log("${snapshot.data["Contact"]}");
        List list = snapshot.data["Contact"];
        friends = list;
        return ListviewSharedWidget(
            friends: friends, year: widget.year, idDay: widget.idDay);
      }
      return Container();
    },
  );
}

@override
Widget build(BuildContext context) {
  return SizedBox(
    height: 450,
    child: Column(
      mainAxisAlignment: MainAxisAlignment.spaceBetween,
      children: [
        SizedBox(
          height: 400,
          child: getFriends(),
        )
      ],
    ),
  );

二等舱：

@override
void initState() {
  year = widget.year;
  idDay = widget.idDay;
  friends = widget.friends;
  _getText();
  super.initState();
}

Future<void> _getText() async {
  await FirebaseFirestore.instance
      .collection("Users")
      .doc(AuthFunc().currentUser!.uid)
      .get()
      .then((value) {
    textEditingController.text = value["Answers"]["$year"]["$idDay"]["text"];
  });
}

@override
Widget build(BuildContext context) {
  return ListView.builder(
    itemCount: friends.length + 1,
    itemBuilder: (context, index) {
      String name = ""; // This variable causing problem
      TextEditingController controller = TextEditingController();
      FirebaseFirestore.instance
          .collection("Users")
          .doc(friends[index - 1])
          .get()
          .then(
        (value) {
          name = value["Name"]; // Here I update the variable
          controller.text = value["Answers"]["$year"]["$idDay"]["text"];
        },
      );
      return Center(
        child: Column(
          children: [
            TextFieldSharedWidget(
              controller: controller, // But this variable is well updated and the text 
                                      // is displayed
              name: name, // But when I use here, the variable is still empty
              currentUser: false,
            ),
            const SizedBox(
              height: 20,
            )
          ],
        ),
      );
    }
  );
}