获取器“用户名”在null上被调用。
class Register extends StatefulWidget {
final User user;
Register({this.user});
@override
RegisterState createState() => RegisterState();
}
class RegisterState extends State<Register> {
final User user;
RegisterState({this.user});
FirestoreService fireServ = new FirestoreService();
TextEditingController _userNameController;
TextEditingController _userEmailController;
TextEditingController _userPasswordController;
TextEditingController _userMobileController;
TextEditingController _userLocationController;
TextEditingController _userBdController;
@override
void initState() {
super.initState();
_userNameController = new TextEditingController(text: ' ${this.user.username}');
_userEmailController = new TextEditingController(text: widget.user.useremail);
_userPasswordController = new TextEditingController(text: widget.user.userpassword);
_userMobileController = new TextEditingController(text: widget.user.usermobile);
_userLocationController = new TextEditingController(text: widget.user.userlcation);
_userBdController = new TextEditingController(text: widget.user.userbd);
}
final FirebaseAuth auth = FirebaseAuth.instance;
final formKey = new GlobalKey<FormState>();
createData() {
fireServ.createUserList(_userNameController.text, _userEmailController.text, _userPasswordController.text, _userMobileController.text, _userLocationController.text, _userBdController.text).then((_) {
Navigator.pop(context);
});
}
void signUp() async {
if (formKey.currentState.validate()) {
formKey.currentState.save();
try {
FirebaseAuth.instance
.createUserWithEmailAndPassword(
email: _userEmailController.text,
password: _userPasswordController.text)
.then((signedUser) {
createData();
});
} catch (e) {
print(e.message);
}
}
}
@override
Widget build(BuildContext context) {
// TODO: implement build
return Scaffold(
appBar: AppBar(
title: Text('RegisterPage'),
),
body: ListView(children: <Widget>[
Container(
child: Form(
key: formKey,
child: Column(
children: loginCard() + SocialMedia(),
),
),
)
],)
);
}
List<Widget> loginCard() {
return [
Padding(
padding: const EdgeInsets.only(top: 50),
child: Stack(
children: <Widget>[
Container(
padding: EdgeInsets.only(top: 20),
child: Column(
children: <Widget>[
Center(
child: Container(
width: 330.0,
height: 500.0,
color: Colors.white.withOpacity(.1),
child: Container(
decoration: new BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.all(Radius.circular(10)),
boxShadow: [
BoxShadow(
color: Colors.black54,
offset: Offset(2, 3),
blurRadius: 10,
)
],
),
child: Container(
padding:
EdgeInsets.only(left: 20, top: 40, right: 15),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
'Register',
style: TextStyle(
fontWeight: FontWeight.bold, fontSize: 30),
),
TextFormField(
controller: _userNameController,
decoration: InputDecoration(
labelText: 'name',
labelStyle: TextStyle(
color: Colors.grey,
fontStyle: FontStyle.italic),
icon: Icon(
Icons.person,
size: 25,
),
hintText: 'your name here',
hintStyle:
Theme.of(context).textTheme.caption,
),
textCapitalization: TextCapitalization.words,
validator: (value)=>value.isEmpty?'Name can\'t be embty':null,
onSaved: (value) => _userNameController.text = value,
),
TextFormField(
controller: _userEmailController,
decoration: InputDecoration(
labelText: 'email',
labelStyle: TextStyle(
color: Colors.grey,
fontStyle: FontStyle.italic),
icon: Icon(
Icons.email,
size: 25,
),
hintText: 'your email here',
hintStyle: TextStyle(
color: Colors.blueGrey, fontSize: 10),
),
keyboardType: TextInputType.emailAddress,
enableInteractiveSelection: true,
validator: (value)=>value.isEmpty?'Email can\'t be embty':null,
onSaved: (value) => _userEmailController.text = value,
),
TextFormField(
controller: _userPasswordController,
obscureText: true,
decoration: InputDecoration(
labelText: 'password',
labelStyle: TextStyle(
color: Colors.grey,
fontStyle: FontStyle.italic),
icon: Icon(
Icons.lock,
size: 23,
),
hintText: 'your password here',
hintStyle: TextStyle(
color: Colors.blueGrey, fontSize: 10),
),
validator: (value)=>value.isEmpty?'Password can\'t be embty':null,
onSaved: (value) => _userPasswordController.text = value,
),
TextFormField(
controller: _userMobileController,
decoration: InputDecoration(
labelText: 'Mobile Number',
labelStyle: TextStyle(
color: Colors.grey,
fontStyle: FontStyle.italic),
icon: Icon(
Icons.lock,
size: 23,
),
hintText: 'your number here',
hintStyle: TextStyle(
color: Colors.blueGrey, fontSize: 10),
),
validator: (value)=>value.isEmpty?'Mobile can\'t be embty':null,
onSaved: (value) => _userMobileController.text = value,
),
TextFormField(
controller: _userLocationController,
decoration: InputDecoration(
labelText: 'Location',
labelStyle: TextStyle(
color: Colors.grey,
fontStyle: FontStyle.italic),
icon: Icon(
Icons.lock,
size: 23,
),
hintText: 'your Location here',
hintStyle: TextStyle(
color: Colors.blueGrey, fontSize: 10),
),
validator: (value)=>value.isEmpty?'Location can\'t be embty':null,
onSaved: (value) => _userLocationController.text = value,
),
TextFormField(
controller: _userBdController,
decoration: InputDecoration(
labelText: 'Birthday',
labelStyle: TextStyle(
color: Colors.grey,
fontStyle: FontStyle.italic),
icon: Icon(
Icons.lock,
size: 23,
),
hintText: 'your number here',
hintStyle: TextStyle(
color: Colors.blueGrey, fontSize: 10),
),
validator: (value)=>value.isEmpty?'Mobile can\'t be embty':null,
onSaved: (value) => _userBdController.text = value,
),
Container(
padding:
const EdgeInsets.only(left: 205, top: 10),
decoration: BoxDecoration(
borderRadius:
BorderRadius.all(Radius.circular(20))),
child: Row(
children: <Widget>[
RaisedButton(
child: Text(
'Sign Up',
style: TextStyle(color: Colors.white),
),
color: Colors.orange,
onPressed: () => signUp(),
),
],
),
),
],
),
),
),
),
),
],
),
),
],
),
),
];
}
主页
void main() => runApp(MaterialApp(
home: MyApp(),
));
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
theme: basicTheme(),
debugShowCheckedModeBanner: false,
title: 'Navigation',
routes: <String, WidgetBuilder>{
'/Login': (BuildContext context) => Login(),
'/Register': (BuildContext context) => Register(),
'/Profile': (BuildContext context) => Profile(),
'/carsPage': (BuildContext context) => carsPage(),
'/MyAppBar': (BuildContext context) => MyAppBar(),
'/EditProfile': (BuildContext dynamic) => EditProfile01(),
'/GarageitemPage': (BuildContext context) => GarageitemPage(),
'/CarItemPage': (BuildContext context) => CarItemPage(),
'/washPagePage': (BuildContext context) => washPage(),
'/reviewsPage': (BuildContext context) => reviewsPage(),
'/WashItemPage': (BuildContext context) => WashItemPage(),
'/AddGarageAds': (BuildContext context) => AddGarageAds(),
'/garagePage': (BuildContext context) => garagePage(),
'/AddGarageAdsFirebase': (BuildContext context) => AddGarageAdsFirebase(),
},
home: Login(),
);
}
}
════════小部件库捕获到异常══════════════════════════════════ ═════════════════════ 在构建Builder时引发了以下NoSuchMethodError： 获取器“用户名”在null上被调用。 接收者：null 尝试致电：用户名
由用户创建的导致错误的小部件的祖先是： MaterialApp文件：///Users/ebroo/IdeaProjects/car_app_firebase_03/lib/main.dart：44：12 引发异常时，这是堆栈：
0 Object.noSuchMethod（dart：core-patch / object_patch.dart：51：5）
1 RegisterState.initState（程序包：car_app_firebase_03 / ui_test / register_page.dart：37：72）
2 StatefulElement._firstBuild（package：flutter / src / widgets / framework.dart：4061：58）
3 ComponentElement.mount（package：flutter / src / widgets / framework.dart：3912：5）
4 Element.inflateWidget（package：flutter / src / widgets / framework.dart：3094：14）
...
答案 0 :(得分：0)
我看到您在对象上调用username的唯一地方是在_userNameController = new TextEditingController(text: ' ${this.user.username}')中，因此看起来this.user为空。
如果这确实是原因，您可能要尝试${this.user?.username}，以确保如果.username为空，this.user不会得到评估。
答案 1 :(得分：0)
从我提供的代码的角度来看，您似乎没有将任何内容传递给导致空指针的 Register 类。
您可以做类似的事情 注册（用户（）；
另一件事，您可以为构造函数添加@required，以帮助您的编译器检查错误 注册（{@required this.user}）；