Muh*_*nus 4 dispose asynchronous flutter
当我单击从个人资料页面到通知的通知导航项时显示此错误
发生异常。FlutterError (setState() 在 dispose() 之后调用: _MyProfileState#c3ad1(lifecycle state: defunct, not installed) 如果您在 State 对象上为不再出现在小部件树中的小部件调用 setState()，则会发生此错误（例如，其父小部件在其构建中不再包含该小部件。当代码从计时器或动画回调中调用 setState() 时，可能会发生此错误。首选解决方案是取消计时器或停止在 dispose() 中收听动画回调。另一种解决方案是在调用 setState() 之前检查此对象的“mounted”属性，以确保该对象仍在树中。如果 setState() 正在被调用，则此错误可能表示内存泄漏，因为另一个对象正在保留在从树中删除后对该 State 对象的引用。
个人资料页 ：
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:play_big_win/constants.dart';
import 'package:play_big_win/services/firebase-auth-helper.dart';
class MyProfile extends StatefulWidget {
@override
_MyProfileState createState() => _MyProfileState();
}
class _MyProfileState extends State<MyProfile> {
final firebaseUser = FirebaseAuth.instance.currentUser;
final db = FirebaseFirestore.instance;
String fullname = '';
String email = '';
@override
void dispose() {
SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
super.dispose();
}
@override
initState() {
SystemChrome.setEnabledSystemUIOverlays([]);
super.initState();
}
getData() async {
while (mounted) {
dynamic names = await FirebaseAuthHelper().getCurrentUserData();
if (names != null) {
fullname = names[0];
email = names[1];
setState(() {});
} else {
print("Nulllll");
}
}
}
@override
Widget build(BuildContext context) {
getData();
return Scaffold(
backgroundColor: kPrimaryColor,
body: SafeArea(
child: ListView(
shrinkWrap: true,
children: [
SizedBox(
height: 20,
),
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Container(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(
Radius.circular(15),
),
),
width: MediaQuery.of(context).size.width - 25,
height: 150,
child: Row(
children: [
CircleAvatar(
radius: 60.0,
backgroundImage: NetworkImage(
'https://res.cloudinary.com/dqunmzmqo/image/upload/v1606248032/male-clipart-avatar_ewaerc.png',
),
),
Padding(
padding: const EdgeInsets.only(top: 45.0),
child: Column(
children: [
Text(
"Name: $fullname",
style: TextStyle(
fontSize: 14,
),
),
SizedBox(
height: 10,
),
Text(
"Email: $email",
style: TextStyle(
fontSize: 14,
),
),
SizedBox(
height: 10,
),
Text(
"Refer Code: Xasdsas",
style: TextStyle(
fontSize: 14,
),
)
],
),
),
],
),
),
Padding(
padding: const EdgeInsets.only(top: 8.0),
child: Text(
'Play Big Win Big',
style: TextStyle(
fontFamily: 'Pacifico',
fontSize: 20.0,
color: Colors.white,
),
),
),
SizedBox(
height: 5,
),
Text(
'V1.0',
style: TextStyle(
fontSize: 10.0,
letterSpacing: 2.5,
color: Colors.teal.shade100,
fontWeight: FontWeight.bold,
),
),
SizedBox(
height: 20.0,
width: 150.0,
child: Divider(
color: Colors.teal.shade100,
),
),
GestureDetector(
onTap: () {
// Navigator.push(
// context,
// MaterialPageRoute(
// builder: (context) => MyprivacyPolicy(),
// ));
},
child: Card(
color: Colors.white,
margin:
EdgeInsets.symmetric(vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Icon(
Icons.group_add,
color: Colors.teal,
),
title: Text(
'Invite Friends',
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 17.0,
color: Colors.teal.shade900,
),
),
),
),
),
GestureDetector(
onTap: () {
// Navigator.push(
// context,
// MaterialPageRoute(
// builder: (context) => MyprivacyPolicy(),
// ));
},
child: Card(
color: Colors.white,
margin:
EdgeInsets.symmetric(vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Icon(
Icons.question_answer,
color: Colors.teal,
),
title: Text(
"FAQ's",
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 17.0,
color: Colors.teal.shade900,
),
),
),
),
),
GestureDetector(
onTap: () {
// Navigator.push(
// context,
// MaterialPageRoute(
// builder: (context) => MyprivacyPolicy(),
// ));
},
child: Card(
color: Colors.white,
margin:
EdgeInsets.symmetric(vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Icon(
Icons.privacy_tip,
color: Colors.teal,
),
title: Text(
'Privacy Policy',
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 17.0,
color: Colors.teal.shade900,
),
),
),
),
),
GestureDetector(
onTap: () {
// Navigator.push(
// context,
// MaterialPageRoute(
// builder: (context) => TermsandCondtions(),
// ));
},
child: Card(
color: Colors.white,
margin:
EdgeInsets.symmetric(vertical: 10.0, horizontal: 25.0),
child: ListTile(
leading: Icon(
Icons.auto_fix_normal,
color: Colors.teal,
),
title: Text(
'Terms & Conditions',
style: TextStyle(
fontWeight: FontWeight.bold,
fontSize: 17.0,
color: Colors.teal.shade900,
),
),
),
),
),
],
),
],
),
),
);
}
}
通知页面：
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../../constants.dart';
class MyNotification extends StatefulWidget {
@override
_MyNotificationState createState() => _MyNotificationState();
}
class _MyNotificationState extends State<MyNotification> {
@override
void dispose() {
SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values);
super.dispose();
}
@override
initState() {
SystemChrome.setEnabledSystemUIOverlays([]);
super.initState();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
centerTitle: true,
backgroundColor: kPrimaryColor,
title: Text(
"Notifications",
),
),
body: Center(
child: Padding(
padding: const EdgeInsets.all(15.0),
child: Container(
decoration: BoxDecoration(
color: Colors.deepPurple,
borderRadius: BorderRadius.all(
Radius.circular(
20,
),
),
),
height: 300,
width: MediaQuery.of(context).size.width,
child: Center(
child: Padding(
padding: const EdgeInsets.all(12.0),
child: Text(
"Today Is Your sadsadasdas das das dsa sa dsa dsad asd as das asd sad asd asds das sa dsa",
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w600,
),
),
),
),
),
),
),
);
}
}
我的验证码：
Future getCurrentUserData() async {
try {
DocumentSnapshot ds = await users.doc(firebaseUser.uid).get();
String fullname = ds.get('full_name');
String email = ds.get('email');
return [fullname, email];
} catch (e) {
print(e.toString());
return null;
}
}
我在个人资料页面中调用的这段代码：
getData() async {
while (mounted) {
dynamic names = await FirebaseAuthHelper().getCurrentUserData();
if (names != null) {
fullname = names[0];
email = names[1];
setState(() {});
} else {
print("Null");
}
}
}
您在 async 函数中使用 setState，等待后，您的小部件可能不再安装。那时执行 setState 会给你一个例外。使用以下代码或将其放在任何其他地方
if (this.mounted) {
setState(() {
});
}
或更明确的方法覆盖 setState
@override
void setState(fn) {
if(mounted) {
super.setState(fn);
}
}