Refer to this Duplicate GlobalKey detected in widget tree , i still have struggle with duplicate key while navigate from Screen A , to Screen B and Navigatie again to Screen A
LoginPage
class LoginPage extends StatefulWidget {
@override
_LoginPageState createState() => _LoginPageState();
}
class _LoginPageState extends State<LoginPage> {
@override
void initState() {
super.initState();
//UsingSharedPreference , If Already Login , GoToHomePage
Provider.of<LoginChangeNotifier>(context, listen: false)
.checkLogin(context);
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
var _size = Screen(MediaQuery.of(context).size);
return Consumer<LoginChangeNotifier>(
builder: (context, login, _) {
return Scaffold(
key:Provider.of<LoginChangeNotifier>(context, listen: false)
.scaffoldLoginKey,
backgroundColor: Colors.black,
body: Container(
child: SingleChildScrollView(
child: Column(
mainAxisSize: MainAxisSize.max,
children: <Widget>[
Container(
),
SizedBox(height: _size.hp(2)),
Form(
key: Provider.of<LoginChangeNotifier>(context, listen: false)
.loginKey,
child:Container(
margin: EdgeInsets.symmetric(horizontal: _size.wp(8)),
child: Column(
children: <Widget>[
TextFormField(
controller: login.controllerEmail,
),
keyboardType: TextInputType.emailAddress,
autovalidate: login.autoValidate,
validator: (e) {
if (e.isEmpty) {
return "Cant Be Empty";
} else {
return null;
}
},
),
SizedBox(height: 16),
TextFormField(
controller: login.controllerPassword,
labelText: 'Password',
),
keyboardType: TextInputType.emailAddress,
obscureText: login.secureText,
autovalidate: login.autoValidate,
validator: (e) {
if (e.isEmpty) {
return "Cant Be Empty";
} else {
return null;
}
},
),
RaisedButton(
color: myPrimaryColor,
children: <Widget>[
Text("Login",
style: TextStyle(
color: Colors.black,
fontFamily: "NunitoSansBold")),
],
),
padding:
EdgeInsets.only(top: 16.0, bottom: 16.0),
onPressed: () {
print("clicked Button Login");
//HereHandleFromProvider
login.authenticationUser(context);
},
),
SizedBox(height: _size.hp(3)),
),
],
),
),
),
],
),
)),
);
},
);
}
Login_Provider
class LoginChangeNotifier with ChangeNotifier {
GlobalKey<ScaffoldState> _scaffoldLoginKey = GlobalKey<ScaffoldState>(
debugLabel: '_scaffoldLoginkey');
GlobalKey<FormState> _loginKey = new GlobalKey<FormState>();
GlobalKey<ScaffoldState> get scaffoldLoginKey => _scaffoldLoginKey;
GlobalKey<FormState> get loginKey => _loginKey;
authenticationUser(BuildContext context) async {
showDialog(
context: context,
builder: (myContext) =>
AlertDialog(
title: new Text('Warning'),
content: new Text('Your Password Expired'),
actions: [
new FlatButton(
onPressed: () {
Navigator.of(context).pushReplacement(
MaterialPageRoute(builder: (context) =>
//MoveToScreenB
ChangePasswordPage()));
},
child: new Text(
'Change Password',
style: TextStyle(color: Colors.lightBlue),
))
],
shape: RoundedRectangleBorder(
side: BorderSide(color: Colors.white70, width: 1),
borderRadius: BorderRadius.circular(10),
),
));
}
ChangePasswordPage
class ChangePasswordPage extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Change Password", style: TextStyle(color: Colors.black)),
centerTitle: true,
iconTheme: IconThemeData(color: Colors.white),
),
key: Provider.of<ChangePasswordNotifier>(context, listen: false)
.scaffoldChangePasswordKey,
body: Consumer<ChangePasswordNotifier>(
builder: (context, changePassword, _) {
return changePassword.changePasswordProcess
? Center(child: CircularProgressIndicator())
: Padding(
padding: EdgeInsets.symmetric(
),
child: Form(
key: Provider.of<ChangePasswordNotifier>(context,
listen: false)
.changePasswordkey,
child: Column(
children: [
TextFormField(),
SizedBox(
height: MediaQuery.of(context).size.height / 47),
TextFormField(),
SizedBox(
height: MediaQuery.of(context).size.height / 47),
TextFormField(),
],
),
),
);
},
),
bottomNavigationBar: BottomAppBar(
elevation: 0.0,
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Consumer<ChangePasswordNotifier>(
builder: (context, changePassword, _) {
return RaisedButton(
onPressed: () {
print("Submit ChangePassword Clicked");
changePassword.changePasswordProcess
? null
//HereHandleOnProvider
: changePassword.check(context);
},
child: Row(
children: <Widget>[
Text("SUBMIT",)
],
));
},
)),
),
);
}
}
ChangePasswordProvider
class ChangePasswordNotifier with ChangeNotifier {
GlobalKey<ScaffoldState> _scaffoldChangePasswordKey = new GlobalKey<ScaffoldState>();
GlobalKey<FormState> _changePasswordkey =new GlobalKey<FormState>();
GlobalKey<FormState> get changePasswordkey => _changePasswordkey;
GlobalKey<ScaffoldState> get scaffoldChangePasswordKey =>
_scaffoldChangePasswordKey;
check(BuildContext context) async {
confirmationPassword(context, "Success");
}
confirmationPassword(BuildContext context, result)async{
var _providerLogin =
Provider.of<LoginChangeNotifier>(context, listen: false);
showDialog(
context: context,
builder: (myContext) => AlertDialog(
title: new Text("Confirmation"),
content: new Text(result),
actions: [
new FlatButton(
onPressed: () {
print("Clicked on Confirmation Password");
Navigator.pushAndRemoveUntil(
context,
//Here i Want to navigate back to Screen A
MaterialPageRoute(builder: (context) => LoginPage()),
(Route<dynamic> route) => false);
},
child: new Text(
'OK',
style: TextStyle(color: Colors.lightBlue),
))
],
shape: RoundedRectangleBorder(
side: BorderSide(color: Colors.white70, width: 1),
borderRadius: BorderRadius.circular(10),
),
));
}
}
The Result when click navigate to Screen A
======== Exception caught by widgets library =======================================================
The following assertion was thrown building Form-[LabeledGlobalKey<FormState>#57f0a](state: FormState#c57b1):
'package:flutter/src/widgets/will_pop_scope.dart': Failed assertion: line 61 pos 12: '_route == ModalRoute.of(context)': is not true.
Either the assertion indicates an error in the framework itself, or we should provide substantially more information in this error message to help you determine and fix the underlying cause.
In either case, please report this assertion by filing a bug on GitHub:
https://github.com/flutter/flutter/issues/new?template=BUG.md
The relevant error-causing widget was:
Form-[LabeledGlobalKey<FormState>#57f0a] file:///urlFile:login_page.dart:37:17
When the exception was thrown, this was the stack:
#2 _WillPopScopeState.didUpdateWidget (package:flutter/src/widgets/will_pop_scope.dart:61:12)
#3 StatefulElement.update (package:flutter/src/widgets/framework.dart:4815:58)
#4 Element.updateChild (package:flutter/src/widgets/framework.dart:3314:15)
#5 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4652:16)
#6 StatefulElement.performRebuild (package:flutter/src/widgets/framework.dart:4800:11)
...
====================================================================================================
======== Exception caught by widgets library =======================================================
The following assertion was thrown while finalizing the widget tree:
Duplicate GlobalKey detected in widget tree.
The following GlobalKey was specified multiple times in the widget tree. This will lead to parts of the widget tree being truncated unexpectedly, because the second time a key is seen, the previous instance is moved to the new location. The key was:
- [LabeledGlobalKey<ScaffoldState>#14011]
This was determined by noticing that after the widget with the above global key was moved out of its previous parent, that previous parent never updated during this frame, meaning that it either did not update at all or updated before the widget was moved, in either case implying that it still thinks that it should have a child with that global key.
The specific parent that did not update after having one or more children forcibly removed due to GlobalKey reparenting is:
- Consumer<LoginChangeNotifier>(dependencies: [_LocalizationsScope-[GlobalKey#f6126], InheritedProvider<LoginChangeNotifier>, _InheritedTheme])
A GlobalKey can only be specified on one widget at a time in the widget tree.
When the exception was thrown, this was the stack:
#0 BuildOwner.finalizeTree.<anonymous closure> (package:flutter/src/widgets/framework.dart:2881:15)
#1 BuildOwner.finalizeTree (package:flutter/src/widgets/framework.dart:2906:8)
#2 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:915:18)
#3 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:302:5)
#4 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1117:15)
...
====================================================================================================
=====EDITED===== For Temp Solution, I figure out to using duplicate pop context (1 for dismissing the alert dialog, and 1 more for back to page A), but I guess this is not a best practice.
Navigator.pop(context);
Navigator.pop(context);
