I am refactoring my Flutter application code by adding Provider as a state management.
Desired behavior: When Home screen opens, app should check if users email verified, if it's not then should show dialog popup.
Problem: It worked fine when I was passing data for EmailVerified through the constructor, but if I want to use Provider, I can't get this data at initState()
lifecycle.
Can you please recommend me correct approach for such use case?
import 'package:myapp/services/authentication.dart';
import 'package:myapp/screens/settings_screen.dart';
import 'package:flutter/material.dart';
import 'package:myapp/services/authentication.dart';
import 'package:provider/provider.dart';
class HomeScreen extends StatefulWidget {
@override
State<StatefulWidget> createState() => new _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
final GlobalKey<FormState> formKey = GlobalKey<FormState>();
bool _isEmailVerified = false;
@override
void initState() {
super.initState();
_checkEmailVerification(); // <=== Method which should show Dialog box if email is not verified which is coming from "Auth" Provider
}
@override
Widget build(BuildContext context) {
final auth = Provider.of<Auth>(context, listen: false); // <==== Service from Provider, which contains data for _isEmailVerified
auth.isEmailVerified().then((value) => _isEmailVerified = value);
return new Scaffold(
appBar: new AppBar(
title: new Text('My App'),
),
body: Center(
child: Column(
children: <Widget>[
Text(
'Welcome to my app',
),
],
),
),
);
}
void _checkEmailVerification() async {
_isEmailVerified = auth.isEmailVerified(); // <=== How can I use "auth" from Provider to get isEmailVerified data ????
if (!_isEmailVerified) {
_showVerifyEmailDialog();
}
}
void _showVerifyEmailDialog() {
showDialog(
context: context,
builder: (BuildContext context) {
// return object of type Dialog
return AlertDialog(
title: new Text("Verify your account"),
content: new Text("Please verify account in the link sent to email"),
actions: <Widget>[
new FlatButton(
child: new Text("Resend link"),
onPressed: () {
Navigator.of(context).pop();
_resentVerifyEmail();
},
),
new FlatButton(
child: new Text("Dismiss"),
onPressed: () {
Navigator.of(context).pop();
},
),
],
);
},
);
}
void _resentVerifyEmail() {
// Logic to send email
}
}
You need to use the context to call Provider.of()
so you can add addPostFrameCallback()
which is called after the first build, there you can use the context
@override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback((timeStamp) {
auth = Provider.of<Auth>(context, listen: false);
});
}