firebase - 我如何从 flutter 的集合中获取所有用户文档

Question

我在Firestore中有一个名为flpProduct的集合。我想访问存储在flpProduct集合中的所有文档。我曾与许多Futurebuilder和Streambuilder一起尝试过，但没有一个起作用。
我试过了

 FutureBuilder<QuerySnapshot> (
        future: flpProductFuture,
        builder: (context, snapshot) {
          if (snapshot.hasError) {
            return Center(
              child: Text('Something went Wrong'),
            );
          }

          if (snapshot.connectionState == ConnectionState.done &&
              snapshot.hasData) {
            snapshot.data.documents.forEach((element) {
              print(element.data['title']);
            });
            return Text('done');
          }

          return Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Spinner(),
              Text(
                'Fetching Data',
                style: TextStyle(color: Colors.black54, fontSize: 18.0),
              )
            ],
          );
        },
      ),

这似乎为我获取了数据，但现在如何在小部件中显示它。
我已经有一个返回容器的类，以在单独的类中显示信息。我只想将数据传递给类(class)并显示它

Answer 1

最好使用StreamBuilder而不是FutureBuilder
因为StreamBuilder负责实时更改

StreamBuilder<QuerySnapshot>(
      stream: FirebaseFirestore.instance.collection(Your collection Name).snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (snapshot.hasError) {
          return Text('Something went wrong');
        }

        if (snapshot.connectionState == ConnectionState.waiting) {
          return Text("Loading");
        }

        return new ListView(
          children: snapshot.data.documents.map((DocumentSnapshot document) {
            return new ListTile(
              title: new Text(document.data()[key]),
              subtitle: new Text(document.data()[key]),
            );
          }).toList(),
        );
      },
    );