Get SharedPreferences before widget build
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0
I want to get my userid before the build fires in my statefulwidget.
If I do this, then build will render before I get my id. If I put it in setstate, my build will use the empty string first and then rerenders it again with my id, but this will cause unnecessary behaviours.
So how do I solve this?
String _userid = '';
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
}
initState() {
super.initState();
setUserid();
}
Build
// Widget build
new Flexible(
child: new StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) return new Text('Loading...');
return new ListView(
children: snapshot.data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
flutter asked Nov 16 '18 at 10:20
SyphSyph
1717
add a comment |
0
I want to get my userid before the build fires in my statefulwidget.
If I do this, then build will render before I get my id. If I put it in setstate, my build will use the empty string first and then rerenders it again with my id, but this will cause unnecessary behaviours.
So how do I solve this?
String _userid = '';
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
}
initState() {
super.initState();
setUserid();
}
Build
// Widget build
new Flexible(
child: new StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) return new Text('Loading...');
return new ListView(
children: snapshot.data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
asked Nov 16 '18 at 10:20
SyphSyph
1717
add a comment |
0
0
0
I want to get my userid before the build fires in my statefulwidget.
If I do this, then build will render before I get my id. If I put it in setstate, my build will use the empty string first and then rerenders it again with my id, but this will cause unnecessary behaviours.
So how do I solve this?
String _userid = '';
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
}
initState() {
super.initState();
setUserid();
}
Build
// Widget build
new Flexible(
child: new StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) return new Text('Loading...');
return new ListView(
children: snapshot.data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
asked Nov 16 '18 at 10:20
SyphSyph
1717
I want to get my userid before the build fires in my statefulwidget.
If I do this, then build will render before I get my id. If I put it in setstate, my build will use the empty string first and then rerenders it again with my id, but this will cause unnecessary behaviours.
So how do I solve this?
String _userid = '';
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
}
initState() {
super.initState();
setUserid();
}
Build
// Widget build
new Flexible(
child: new StreamBuilder<QuerySnapshot>(
stream: Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots(),
builder:
(BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
if (!snapshot.hasData) return new Text('Loading...');
return new ListView(
children: snapshot.data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
asked Nov 16 '18 at 10:20
SyphSyph
1717
asked Nov 16 '18 at 10:20
SyphSyph
1717
asked Nov 16 '18 at 10:20
SyphSyph
1717
asked Nov 16 '18 at 10:20
SyphSyph
1717
asked Nov 16 '18 at 10:20
SyphSyph
1717
1717
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
1
You can't, but you can guard against it being null.
Also it's easier to move the StreamBuilder to initState
String _userid = '';
dynamic _data;
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
_data = await Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots().first;
setState(() {});
}
initState() {
super.initState();
setUserid();
}
return new Flexible(
child:
if(_data == null) return new Text('Loading...');
return new ListView(
children: _data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
1
You can uselisten()instead offirstand movesetState(...)intolisten(...)
– Günter Zöchbauer
Nov 16 '18 at 11:07
add a comment |
0
You can use FutureBuilder
Future<String> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
return _userid;
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: setUserid(),
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
if (snapshot.hasData) {
return ... // your widget
} else return CircularProgressIndicator();
});
Something like this
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
You can't, but you can guard against it being null.
Also it's easier to move the StreamBuilder to initState
String _userid = '';
dynamic _data;
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
_data = await Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots().first;
setState(() {});
}
initState() {
super.initState();
setUserid();
}
return new Flexible(
child:
if(_data == null) return new Text('Loading...');
return new ListView(
children: _data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
1
You can uselisten()instead offirstand movesetState(...)intolisten(...)
– Günter Zöchbauer
Nov 16 '18 at 11:07
add a comment |
1
You can't, but you can guard against it being null.
Also it's easier to move the StreamBuilder to initState
String _userid = '';
dynamic _data;
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
_data = await Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots().first;
setState(() {});
}
initState() {
super.initState();
setUserid();
}
return new Flexible(
child:
if(_data == null) return new Text('Loading...');
return new ListView(
children: _data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
1
You can uselisten()instead offirstand movesetState(...)intolisten(...)
– Günter Zöchbauer
Nov 16 '18 at 11:07
add a comment |
1
1
1
You can't, but you can guard against it being null.
Also it's easier to move the StreamBuilder to initState
String _userid = '';
dynamic _data;
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
_data = await Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots().first;
setState(() {});
}
initState() {
super.initState();
setUserid();
}
return new Flexible(
child:
if(_data == null) return new Text('Loading...');
return new ListView(
children: _data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
You can't, but you can guard against it being null.
Also it's easier to move the StreamBuilder to initState
String _userid = '';
dynamic _data;
Future<Null> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
_data = await Firestore.instance
.collection('users')
.document(_userid)
.collection('rooms')
.snapshots().first;
setState(() {});
}
initState() {
super.initState();
setUserid();
}
return new Flexible(
child:
if(_data == null) return new Text('Loading...');
return new ListView(
children: _data.documents
.map(
(DocumentSnapshot document) => new Text('lol'),
// )
//new OverviewPresentation(presentation: document),
)
.toList(),
);
},
),
),
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
answered Nov 16 '18 at 10:28
Günter ZöchbauerGünter Zöchbauer
335k721018947
335k721018947
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
1
You can uselisten()instead offirstand movesetState(...)intolisten(...)
– Günter Zöchbauer
Nov 16 '18 at 11:07
add a comment |
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
1
You can uselisten()instead offirstand movesetState(...)intolisten(...)
– Günter Zöchbauer
Nov 16 '18 at 11:07
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
Doing it this way means, my widget doesn't listen for data being added or modified in firestore right and if my _userid is empty when I use it, firestore will throw an error since my call will be /'users'//'rooms'/
– Syph
Nov 16 '18 at 11:01
1
1
You can use
listen() instead of first and move setState(...) into listen(...)– Günter Zöchbauer
Nov 16 '18 at 11:07
You can use
listen() instead of first and move setState(...) into listen(...)– Günter Zöchbauer
Nov 16 '18 at 11:07
add a comment |
0
You can use FutureBuilder
Future<String> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
return _userid;
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: setUserid(),
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
if (snapshot.hasData) {
return ... // your widget
} else return CircularProgressIndicator();
});
Something like this
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
add a comment |
0
You can use FutureBuilder
Future<String> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
return _userid;
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: setUserid(),
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
if (snapshot.hasData) {
return ... // your widget
} else return CircularProgressIndicator();
});
Something like this
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
add a comment |
0
0
0
You can use FutureBuilder
Future<String> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
return _userid;
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: setUserid(),
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
if (snapshot.hasData) {
return ... // your widget
} else return CircularProgressIndicator();
});
Something like this
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
You can use FutureBuilder
Future<String> setUserid() async {
SharedPreferences pref = await SharedPreferences.getInstance();
_userid = pref.getString('FB_USER');
return _userid;
}
@override
Widget build(BuildContext context) {
return FutureBuilder(
future: setUserid(),
builder: (BuildContext context, AsyncSnapshot<String> snapshot) {
if (snapshot.hasData) {
return ... // your widget
} else return CircularProgressIndicator();
});
Something like this
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
answered Nov 16 '18 at 10:26
Andrey TurkovskyAndrey Turkovsky
1
1
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
add a comment |
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
don't call the async function within build: stackoverflow.com/questions/52249578/…
– Rémi Rousselet
Nov 16 '18 at 10:33
add a comment |
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