FutureBuilder and ListView.builder - database

Question

Can someone please explain to me how to use itemCount from ListView.Builder which is inside of an FutureBuilder.
For now my FirebaseCloud Store only has one Document , and my app is returning an infinity list of documents,
I tried to use itemCount: snapshot.data.documents.length,
however, Get the error: Class 'DocumentSnapshot' has no instance getter 'documents'. Receiver: Instance of 'DocumentSnapshot' Tried calling: documents
EDIT it should only show this document one time and one of a kind if there is more than one document related to the UID
Here is my Code
final tabs = [
Center(
child: (Scaffold(
body: FutureBuilder(
future: FirebaseFirestore.instance
.collection('users')
.doc(uid)
.get(),
builder: (context, AsyncSnapshot snapshot) {
if (snapshot.data == null)
return CircularProgressIndicator();
DocumentSnapshot manuais = snapshot.data;
if (snapshot.hasData) {
print('okkk');
print(manuais.data()['nome']);
} else {
print('nopeeeee');
}
return Container(
padding: EdgeInsets.all(16),
child: ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot manuais = snapshot.data;
return Card(
color: Colors.grey[250],
child: Container(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
new Image.asset(
'Images/pdflogo.png',
width: 32,
),
Center(
child: Text(
(manuais.data()['nome'].toString()),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: 16),
),
),
ButtonBar(
children: <Widget>[
FlatButton(
child: const Text(
'Compartilhar / Download'),
onPressed: () async {
var request = await HttpClient()
.getUrl(Uri.parse(manuais
.data()['documento']));
var response =
await request.close();
Uint8List bytes =
await consolidateHttpClientResponseBytes(
response);
await Share.file(
'ESYS AMLOG',
'Manual.pdf',
bytes,
'image/jpg');
}),
],
),
],
),
),
);
}),
);
})))),
````

Answer 1

You have to do:
itemCount : 1
Since you are only retrieving one document, when you do:
FirebaseFirestore.instance
.collection('users')
.doc(uid)
.get()
The above will always retrieve one document since the document id will always be unique.

Answer 2

You need to get length like this.
itemCount: snapshot.data.data().length,

Answer 3

if (snapshot.hasData) {
print('okkk');
print(manuais.data()['nome']);
return Container(
padding: EdgeInsets.all(16),
child: ListView.builder(
itemCount: snapshot.data.documents.length,
itemBuilder: (context, index) {
DocumentSnapshot manuais = snapshot.data;
return Card(
color: Colors.grey[250],
child: Container(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment:
CrossAxisAlignment.start,
children: <Widget>[
new Image.asset(
'Images/pdflogo.png',
width: 32,
),
Center(
child: Text(
(manuais.data()['nome'].toString()),
maxLines: 1,
overflow: TextOverflow.ellipsis,
style: TextStyle(fontSize: 16),
),
),
ButtonBar(
children: <Widget>[
FlatButton(
child: const Text(
'Compartilhar / Download'),
onPressed: () async {
var request = await HttpClient()
.getUrl(Uri.parse(manuais
.data()['documento']));
var response =
await request.close();
Uint8List bytes =
await consolidateHttpClientResponseBytes(
response);
await Share.file(
'ESYS AMLOG',
'Manual.pdf',
bytes,
'image/jpg') ...(all your brackets go here)
}