How to read value in the createState method of StatefulWidget
1
Hello I want to read the value from the SharedPreferences inside the createState of the StatefulWidget.
I tried to add async after the method but it doesn't work. What is the correct way to do ?
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() {
// check if user is logged. If logged then send user to dashboard else keep it here
return new _LoginScreenState();
}
}
android ios 
flutter sharedpreferences asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
add a comment |
1
Hello I want to read the value from the SharedPreferences inside the createState of the StatefulWidget.
I tried to add async after the method but it doesn't work. What is the correct way to do ?
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() {
// check if user is logged. If logged then send user to dashboard else keep it here
return new _LoginScreenState();
}
}
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
That's not a good idea. Do it ininitState()of_LoginScreenState()instead.
– Günter Zöchbauer
Nov 22 '18 at 16:53
How to do there ?
– N Sharma
Nov 22 '18 at 16:56
Nothing special, just do it and usesetState(() { ...})to update the value when it's available. This is a FAQ and there should be several answers for that on StackOverflow already.
– Günter Zöchbauer
Nov 22 '18 at 16:58
1
I'd usedidChangeDependenciesinstead in case the user disconnect. User details most likely comes from an InheritedWidget anyway
– Rémi Rousselet
Nov 22 '18 at 17:03
add a comment |
1
1
1
Hello I want to read the value from the SharedPreferences inside the createState of the StatefulWidget.
I tried to add async after the method but it doesn't work. What is the correct way to do ?
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() {
// check if user is logged. If logged then send user to dashboard else keep it here
return new _LoginScreenState();
}
}
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
Hello I want to read the value from the SharedPreferences inside the createState of the StatefulWidget.
I tried to add async after the method but it doesn't work. What is the correct way to do ?
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() {
// check if user is logged. If logged then send user to dashboard else keep it here
return new _LoginScreenState();
}
}
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
asked Nov 22 '18 at 16:52
N SharmaN Sharma
7,31047147299
7,31047147299
That's not a good idea. Do it ininitState()of_LoginScreenState()instead.
– Günter Zöchbauer
Nov 22 '18 at 16:53
How to do there ?
– N Sharma
Nov 22 '18 at 16:56
Nothing special, just do it and usesetState(() { ...})to update the value when it's available. This is a FAQ and there should be several answers for that on StackOverflow already.
– Günter Zöchbauer
Nov 22 '18 at 16:58
1
I'd usedidChangeDependenciesinstead in case the user disconnect. User details most likely comes from an InheritedWidget anyway
– Rémi Rousselet
Nov 22 '18 at 17:03
add a comment |
That's not a good idea. Do it ininitState()of_LoginScreenState()instead.
– Günter Zöchbauer
Nov 22 '18 at 16:53
How to do there ?
– N Sharma
Nov 22 '18 at 16:56
Nothing special, just do it and usesetState(() { ...})to update the value when it's available. This is a FAQ and there should be several answers for that on StackOverflow already.
– Günter Zöchbauer
Nov 22 '18 at 16:58
1
I'd usedidChangeDependenciesinstead in case the user disconnect. User details most likely comes from an InheritedWidget anyway
– Rémi Rousselet
Nov 22 '18 at 17:03
That's not a good idea. Do it in
initState() of _LoginScreenState() instead.– Günter Zöchbauer
Nov 22 '18 at 16:53
That's not a good idea. Do it in
initState() of _LoginScreenState() instead.– Günter Zöchbauer
Nov 22 '18 at 16:53
How to do there ?
– N Sharma
Nov 22 '18 at 16:56
How to do there ?
– N Sharma
Nov 22 '18 at 16:56
Nothing special, just do it and use
setState(() { ...}) to update the value when it's available. This is a FAQ and there should be several answers for that on StackOverflow already.– Günter Zöchbauer
Nov 22 '18 at 16:58
Nothing special, just do it and use
setState(() { ...}) to update the value when it's available. This is a FAQ and there should be several answers for that on StackOverflow already.– Günter Zöchbauer
Nov 22 '18 at 16:58
1
1
I'd use
didChangeDependencies instead in case the user disconnect. User details most likely comes from an InheritedWidget anyway– Rémi Rousselet
Nov 22 '18 at 17:03
I'd use
didChangeDependencies instead in case the user disconnect. User details most likely comes from an InheritedWidget anyway– Rémi Rousselet
Nov 22 '18 at 17:03
add a comment |
2 Answers
2
active
oldest
votes
3
You don't.
You should not have anything inside createState beside the state creation. If you want to do these kind of check, do them inside the State class instead:
class MyState extends State<MyWidget> {
@override
void didChangeDependencies() {
// check if the user is logged
}
}
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
add a comment |
1
Don't use createState to read the values, you can use initState or FutureBuilder maybe.
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
String value;
_readPreference() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
//refresh your screen based on the current parameter
setState(() {
value = prefs.getString("your_value_key");
});
}
@override
void initState() {
_readPreference();
super.initState();
}
@override
Widget build(BuildContext context) {
return Container();
}
}
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
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
3
You don't.
You should not have anything inside createState beside the state creation. If you want to do these kind of check, do them inside the State class instead:
class MyState extends State<MyWidget> {
@override
void didChangeDependencies() {
// check if the user is logged
}
}
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
add a comment |
3
You don't.
You should not have anything inside createState beside the state creation. If you want to do these kind of check, do them inside the State class instead:
class MyState extends State<MyWidget> {
@override
void didChangeDependencies() {
// check if the user is logged
}
}
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
add a comment |
3
3
3
You don't.
You should not have anything inside createState beside the state creation. If you want to do these kind of check, do them inside the State class instead:
class MyState extends State<MyWidget> {
@override
void didChangeDependencies() {
// check if the user is logged
}
}
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
You don't.
You should not have anything inside createState beside the state creation. If you want to do these kind of check, do them inside the State class instead:
class MyState extends State<MyWidget> {
@override
void didChangeDependencies() {
// check if the user is logged
}
}
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
answered Nov 22 '18 at 17:02
Rémi RousseletRémi Rousselet
28.2k36090
28.2k36090
add a comment |
add a comment |
1
Don't use createState to read the values, you can use initState or FutureBuilder maybe.
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
String value;
_readPreference() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
//refresh your screen based on the current parameter
setState(() {
value = prefs.getString("your_value_key");
});
}
@override
void initState() {
_readPreference();
super.initState();
}
@override
Widget build(BuildContext context) {
return Container();
}
}
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
add a comment |
1
Don't use createState to read the values, you can use initState or FutureBuilder maybe.
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
String value;
_readPreference() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
//refresh your screen based on the current parameter
setState(() {
value = prefs.getString("your_value_key");
});
}
@override
void initState() {
_readPreference();
super.initState();
}
@override
Widget build(BuildContext context) {
return Container();
}
}
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
add a comment |
1
1
1
Don't use createState to read the values, you can use initState or FutureBuilder maybe.
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
String value;
_readPreference() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
//refresh your screen based on the current parameter
setState(() {
value = prefs.getString("your_value_key");
});
}
@override
void initState() {
_readPreference();
super.initState();
}
@override
Widget build(BuildContext context) {
return Container();
}
}
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
Don't use createState to read the values, you can use initState or FutureBuilder maybe.
class LoginScreen extends StatefulWidget {
@override
_LoginScreenState createState() => _LoginScreenState();
}
class _LoginScreenState extends State<LoginScreen> {
String value;
_readPreference() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
//refresh your screen based on the current parameter
setState(() {
value = prefs.getString("your_value_key");
});
}
@override
void initState() {
_readPreference();
super.initState();
}
@override
Widget build(BuildContext context) {
return Container();
}
}
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
answered Nov 22 '18 at 17:02
diegoveloperdiegoveloper
12k11630
12k11630
add a comment |
add a comment |
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That's not a good idea. Do it in
initState()of_LoginScreenState()instead.– Günter Zöchbauer
Nov 22 '18 at 16:53
How to do there ?
– N Sharma
Nov 22 '18 at 16:56
Nothing special, just do it and use
setState(() { ...})to update the value when it's available. This is a FAQ and there should be several answers for that on StackOverflow already.– Günter Zöchbauer
Nov 22 '18 at 16:58
1
I'd use
didChangeDependenciesinstead in case the user disconnect. User details most likely comes from an InheritedWidget anyway– Rémi Rousselet
Nov 22 '18 at 17:03