Flutter : Refresh The Page with AlertDialog - flutter

Question

I am working on a card game and it includes 2 parts.
InputPage
GamePage
In InputPage() user picks cards and it has a new game button. When user click on it, page must be reload. I did this with Navigator.of method. But when user go to GamePage(), i got an error like this:
Unhandled Exception: setState() called after dispose(): _GamePageState#d4518(lifecycle state: defunct, not mounted)
This error happens if you call setState() on a State object for a widget that no longer appears in the widget tree (e.g., whose parent widget no longer includes the widget in its build). This error can occur when code calls setState() from a timer or an animation callback.
The preferred solution is to cancel the timer or stop listening to the animation in the dispose() callback. Another solution is to check the "mounted" property of this object before calling setState() to ensure the object is still in the tree.
This is my code:
ayarAlert2(BuildContext context) async {
AlertDialog alert = AlertDialog(
title: Center(
child: Container(
decoration: BoxDecoration(
borderRadius: const BorderRadius.all(
Radius.circular(15.0),
),
),
child: Text(
" Settings ",
style: TextStyle(color: Colors.white, fontWeight: FontWeight.w300),
),
),
),
backgroundColor: Color(0xFF1F010B),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(15)),
content: Container(
child: Wrap(
runSpacing: 5,
spacing: 10,
children: <Widget>[
FlatButton(
onPressed: () {
Navigator.pop(context);
Navigator.of(context).push(new MaterialPageRoute(
builder: (BuildContext context) => InputPage()));
},
child: Center(
child: Row(
children: [Container(
child: Text(
" New Game ",
style: TextStyle(
color: Colors.white,
fontSize: 32,
fontWeight: FontWeight.w300),
)),
],
),
)),
],
),
),
);
// show the dialog
showDialog(
barrierColor: Colors.black.withOpacity(0.01),
context: context,
builder: (BuildContext context) {
return alert;
},
);
}
When user picks all the cards ,he/she press the " START " button. Heres the start button :
Navigator.of(context).pushReplacement(
new MaterialPageRoute(
builder: (BuildContext context) =>
new GamePage(
mycards: cardBrain.mycards,
yourcards:
cardBrain.rakipcards,
annen: true,
)));
This is InputPage() 's initState
#override
void initState() {
super.initState();
Future.delayed(Duration.zero, () {
showDialog(
context: context,
builder: (context) => AlertDialog(
content: Container(
child: Wrap(
alignment: WrapAlignment.center,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: [
FlatButton(
onPressed: () {
setState(() {
cardBrain.kartbol();
Navigator.pop(context);
});
},
child: Center(
child: Row(
children: [
Center(
child: Container(
child: Text(
" START ",
)),
),
],
),
)),
],
),
],
),
),
));
});
}
#override
void dispose() {
// TODO: implement dispose
super.dispose();
// animationController.dispose() instead of your controller.dispose
}
And this is GamePage() 's initState :
#override
void initState() {
super.initState();
WidgetsBinding.instance
.addPostFrameCallback((_) => showAlertDialog(context));
_now = DateTime.now().second.toString();
// defines a timer
_everySecond = Timer.periodic(Duration(seconds: 1), (Timer t) {
if (annenn == true) {
setState(() {
_now = DateTime.now().second.toString();
if (cardBrain.bitir == 13) {
if (ihale <= cardBrain.bizimskor) {
mesaj = "WIN";
} else {
mesaj = "LOSE";
}
sonucAlert(context, cardBrain.bizimskor, mesaj, cardBrain.onunskor,
widget.annen);
}
});
}
});
}

Answer 1

A solution would be to use the popAndPushNamed method:
await Navigator.popAndPushNamed(context, '/gameScreen');
Remember to define the route in the MaterialApp class, usually in the main.dart file:
MaterialApp(
initialRoute: '/',
routes: {
'/': (context) => InputPage(),
'/gameScreen': (context) => GamePage(),
},
);