我在使用 Flutter 设置使用电子邮件和密码注册时遇到问题。我让它登录新用户并保存他们的 Firebase 身份验证信息，但它不会将任何配置文件数据保存到 Firebase 存储部分。我不确定我在这里做错了什么，我不明白为什么 id 为空。一些帮助和指导将不胜感激！
这是我得到的错误
Unhandled Exception: NoSuchMethodError: The getter 'id' was called on null.
Receiver: null
Tried calling: id
这是来自 signupuser.dart
import ''
File _image;
class SignUpScreen extends StatefulWidget {
static final String id = 'SignUpScreen';
@override
State createState() => _SignUpState();
}
class _SignUpState extends State<SignUpScreen> {
TextEditingController _passwordController = new TextEditingController();
GlobalKey<FormState> _key = new GlobalKey();
bool _validate = false;
String Username, Fullname, email, mobile, password, confirmPassword;
User loggedInUser;
_sendToServer() async {
if (_key.currentState.validate()) {
_key.currentState.save();
showProgress(context, 'Creating new account...', false);
var profilePicUrl = '';
try {
AuthResult result = await FirebaseAuth.instance
.createUserWithEmailAndPassword(email: email, password: password);
if (_image != null) {
updateProgress('Uploading image...');
profilePicUrl = await FireStoreUtils()
.uploadUserImageToFireStorage(_image, result.user.uid);
}
User user = User(
email: email,
displayName: Fullname,
username: Username,
//phoneNumber: mobile,
userID: result.user.uid,
/* id: nearu.currentUser.id,*/
active: true,
//lastName: lastName,
settings: Settings(allowPushNotifications: true),
photoUrl: profilePicUrl);
await FireStoreUtils.firestore
.collection(USERS)
.document(result.user.uid)
.setData(user.toJson());
hideProgress();
nearu.currentUser = user;
pushAndRemoveUntil(context, navigation(), false);
} catch (error) {
hideProgress();
(error as PlatformException).code != 'ERROR_EMAIL_ALREADY_IN_USE'
? showAlertDialog(context, 'Failed', 'Couldn\'t sign up')
: showAlertDialog(context, 'Failed',
'Email already in use. Please pick another email address');
print(error.toString());
}
} else {
print('false');
setState(() {
_validate = true;
});
}
}
@override
Widget build(BuildContext context) {
if (Platform.isAndroid) {
retrieveLostData();
}
return Scaffold(
appBar: AppBar(
elevation: 0.0,
backgroundColor: Colors.transparent,
iconTheme: IconThemeData(color: Colors.black),
),
body: SingleChildScrollView(
child: new Container(
margin: new EdgeInsets.only(left: 16.0, right: 16, bottom: 16),
child: new Form(
key: _key,
autovalidate: _validate,
child: formUI(),
),
)
),
);
}
Future<void> retrieveLostData() async {
final LostDataResponse response = await ImagePicker.retrieveLostData();
if (response == null) {
return;
}
if (response.file != null) {
setState(() {
_image = response.file;
});
}
}
_onCameraClick() {
final action = CupertinoActionSheet(
message: Text(
"Add profile picture",
style: TextStyle(fontSize: 15.0),
),
actions: <Widget>[
CupertinoActionSheetAction(
child: Text("Choose from gallery"),
isDefaultAction: false,
onPressed: () async {
Navigator.pop(context);
var image =
await ImagePicker.pickImage(source: ImageSource.gallery);
setState(() {
_image = image;
});
},
),
CupertinoActionSheetAction(
child: Text("Take a picture"),
isDestructiveAction: false,
onPressed: () async {
Navigator.pop(context);
var image = await ImagePicker.pickImage(source: ImageSource.camera);
setState(() {
_image = image;
});
},
)
],
cancelButton: CupertinoActionSheetAction(
child: Text("Cancel"),
onPressed: () {
Navigator.pop(context);
},
),
);
showCupertinoModalPopup(context: context, builder: (context) => action);
}
Widget formUI() {
return new Column(
children: <Widget>[
new Align(
alignment: Alignment.topLeft,
child: Text(
'Create new account',
style: TextStyle(
color: Color(COLOR_PRIMARY),
fontWeight: FontWeight.bold,
fontSize: 25.0),
)),
Padding(
padding:
const EdgeInsets.only(left: 8.0, top: 32, right: 8, bottom: 8),
child: Stack(
alignment: Alignment.bottomCenter,
children: <Widget>[
CircleAvatar(
radius: 65,
backgroundColor: Colors.grey.shade400,
child: ClipOval(
child: SizedBox(
width: 170,
height: 170,
child: _image == null
? Image.asset(
'assets/images/placeholder.jpg',
fit: BoxFit.cover,
)
: Image.file(
_image,
fit: BoxFit.cover,
),
),
),
),
Positioned(
left: 80,
right: 0,
child: FloatingActionButton(
backgroundColor: Color(COLOR_ACCENT),
child: Icon(Icons.camera_alt),
mini: true,
onPressed: _onCameraClick),
)
],
),
),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding:
const EdgeInsets.only(top: 16.0, right: 8.0, left: 8.0),
child: TextFormField(
validator: validateName,
onSaved: (String val) {
Username = val;
},
textInputAction: TextInputAction.next,
onFieldSubmitted: (_) => FocusScope.of(context).nextFocus(),
decoration: InputDecoration(
contentPadding: new EdgeInsets.symmetric(
vertical: 8, horizontal: 16),
fillColor: Colors.white,
hintText: 'Username',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(COLOR_PRIMARY),
width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))))),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding:
const EdgeInsets.only(top: 16.0, right: 8.0, left: 8.0),
child: TextFormField(
validator: validateName,
onSaved: (String val) {
Fullname = val;
},
textInputAction: TextInputAction.next,
onFieldSubmitted: (_) => FocusScope.of(context).nextFocus(),
decoration: InputDecoration(
contentPadding: new EdgeInsets.symmetric(
vertical: 8, horizontal: 16),
fillColor: Colors.white,
hintText: 'Full Name',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(COLOR_PRIMARY),
width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))))),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding:
const EdgeInsets.only(top: 16.0, right: 8.0, left: 8.0),
child: TextFormField(
keyboardType: TextInputType.emailAddress,
textInputAction: TextInputAction.next,
onFieldSubmitted: (_) => FocusScope.of(context).nextFocus(),
validator: validateEmail,
onSaved: (String val) {
email = val;
},
decoration: InputDecoration(
contentPadding: new EdgeInsets.symmetric(
vertical: 8, horizontal: 16),
fillColor: Colors.white,
hintText: 'Email Address',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(COLOR_PRIMARY),
width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))))),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding: const EdgeInsets.only(top: 16.0, right: 8.0, left: 8.0),
child: TextFormField(
obscureText: true,
textInputAction: TextInputAction.next,
onFieldSubmitted: (_) => FocusScope.of(context).nextFocus(),
controller: _passwordController,
validator: validatePassword,
onSaved: (String val) {
password = val;
},
style: TextStyle(height: 0.8, fontSize: 18.0),
cursorColor: Color(COLOR_PRIMARY),
decoration: InputDecoration(
contentPadding:
new EdgeInsets.symmetric(vertical: 8, horizontal: 16),
fillColor: Colors.white,
hintText: 'Password',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(COLOR_PRIMARY),
width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))),
)),
ConstrainedBox(
constraints: BoxConstraints(minWidth: double.infinity),
child: Padding(
padding: const EdgeInsets.only(top: 16.0, right: 8.0, left: 8.0),
child: TextFormField(
textInputAction: TextInputAction.done,
onFieldSubmitted: (_) {
_sendToServer();
},
obscureText: true,
validator: (val) =>
validateConfirmPassword(_passwordController.text, val),
onSaved: (String val) {
confirmPassword = val;
},
style: TextStyle(height: 0.8, fontSize: 18.0),
cursorColor: Color(COLOR_PRIMARY),
decoration: InputDecoration(
contentPadding:
new EdgeInsets.symmetric(vertical: 8, horizontal: 16),
fillColor: Colors.white,
hintText: 'Confirm Password',
focusedBorder: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
borderSide: BorderSide(
color: Color(COLOR_PRIMARY), width: 2.0)),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(25.0),
))),
),
),
Padding(
padding: const EdgeInsets.only(right: 40.0, left: 40.0, top: 40.0),
child: ConstrainedBox(
constraints: const BoxConstraints(minWidth: double.infinity),
child: RaisedButton(
color: Color(FACEBOOK_BUTTON_COLOR),
child: Text(
'Sign Up',
style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
),
textColor: Colors.white,
splashColor: Color(FACEBOOK_BUTTON_COLOR),
onPressed: _sendToServer,
padding: EdgeInsets.only(top: 12, bottom: 12),
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(25.0),
side: BorderSide(
color: Color(FACEBOOK_BUTTON_COLOR))),
),
),
),
],
);
}
@override
void dispose() {
_passwordController.dispose();
_image = null;
super.dispose();
}
}
我尝试了 Flutter: Unhandled Exception: NoSuchMethodError: The getter 'id' was called on null. Receiver: null Tried calling: id 但没有得到排序。