Flutter Firebase StreamBuilder how to use only one specific document

Question

My Code is working but there is a problem it runs 4 times I think problem is Document number. In Firebase Firestore I have 4 document but i need to use only one at a time. So How can i do this. I found some solutions but all of them old their code doesn't work, it seems to be changed. Here is the full code:

  Widget build(BuildContext context) {
final Stream<QuerySnapshot> _usersStream =
    FirebaseFirestore.instance.collection('catanR').snapshots();
height = MediaQuery.of(context).size.height;
width = MediaQuery.of(context).size.width;

return StreamBuilder<QuerySnapshot>(
  stream: _usersStream,
  builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
    if (snapshot.hasError) {
      return Container(
        color: Colors.white,
        child: Center(
          child: Text(
            'Something went wrong',
            style: TextStyle(fontFamily: 'Cairo', fontSize: 24),
          ),
        ),
      );
    }

    if (snapshot.connectionState == ConnectionState.waiting) {
      return Container(
        color: Colors.white,
        child: Center(
          child: CircularProgressIndicator(),
        ),
      );
    }

    return Material(
      child: ListView(
        children: snapshot.data!.docs.map((DocumentSnapshot document) {
          Map<String, dynamic> data =
              document.data() as Map<String, dynamic>;

          return Container( // THİS PART DOESN'T MATTER

Actual Output is like this:

However, when I scroll because of the StreamBuilder and the document number, that number of screens appears. And as you guessed i just only need one without scrolling.

Answer 1

If you want to build it once, don't return a ListView and its children generated from the collection's docs, just return the container with the data[index] you want to use.

Answer 2

Update 2023 with null safety

Try the following code example:

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: StreamBuilder<DocumentSnapshot<Map<String, dynamic>>>(
          stream:  FirebaseFirestore
                   .instance
                   .collection('users')
                   .doc(FirebaseAuth.instance.currentUser!.uid) // 👈 Your document id change accordingly
                   .snapshots(), 
          builder:
              (BuildContext context, AsyncSnapshot<DocumentSnapshot> snapshot) {
            if (snapshot.hasError) {
              return const Text('Something went wrong');
            }
            if (snapshot.connectionState == ConnectionState.waiting) {
              return const Text("Loading");
            }
            Map<String, dynamic> data =
                snapshot.data!.data()! as Map<String, dynamic>;
            return Text(data['fullName']); // 👈 your valid data here
          },
        ),
      ),
    );
  }

Also refer: How to use StreamBuilder and FutureBuilder for single and multiple documents