如何解决在使用 getter 获取 ImageUrl 时,在使用电子邮件注册时将用户头像图像上传到 firebase 时会给出空值
因此,我尝试将用户头像上传到 firebase 存储,同时使用电子邮件和密码注册到 firebase auth 并同时将其添加到 cloud firestore ,但是我使用 imageFilePicker 上传的图像在尝试获取时返回 null。 我正在使用提供程序进行状态管理。我是新手。
图片上传代码:
class FirebaseOperations with ChangeNotifier {
UploadTask imageUploadTask;
String initUserEmail,initUserName,initUserImage;
String get getInitUserName => initUserName;
String get getInitUserEmail => initUserEmail;
String get getInitUserImage => initUserImage;
Future uploadUserAvatar(BuildContext context) async {
Reference imageReference = FirebaseStorage.instance
.ref()
.child('userProfileAvatar/${DateTime.now()}');
imageUploadTask = imageReference.putFile(
Provider.of<ImageSelect>(context,listen: false).getUserAvatar);
await imageUploadTask.whenComplete(() {
print('Image uploaded!');
});
imageReference.getDownloadURL().then((url) {
print("################################################" + url);
Provider.of<ImageSelect>(context,listen: false).userAvatarUrl =
url.toString();
print(
'the user profile avatar url => ${Provider.of<ImageSelect>(context,listen: false).userAvatarUrl}');
notifyListeners();
});
}
Future initUserData(BuildContext context) async {
return FirebaseFirestore.instance
.collection('users')
.doc(Provider.of<Authentication>(context,listen: false).getUserUid)
.get()
.then((doc) {
print('Fetching user data');
initUserName = doc.data()['username'];
initUserEmail = doc.data()['useremail'];
initUserImage = doc.data()['userimage'];
print(initUserName);
print(initUserEmail);
print(initUserImage);
notifyListeners();
});
}
}
图片选择代码:
class ImageSelect with ChangeNotifier {
final picker = ImagePicker();
File userAvatar;
File get getUserAvatar => userAvatar;
String userAvatarUrl;
String get getUserAvatarUrl => userAvatarUrl;
Future pickUserAvatar(BuildContext context,ImageSource source) async {
final pickedUserAvatar = await picker.getImage(source: source);
pickedUserAvatar == null
? print('Select image')
: userAvatar = File(pickedUserAvatar.path);
// print(userAvatar.path);
if (userAvatar != null) {
await Provider.of<FirebaseOperations>(context,listen: false)
.uploadUserAvatar(context);
} else
print('Image not Selected ');
notifyListeners();
}
注册按钮代码:
GestureDetector(
onTap: () {
if (_emailController.text.isNotEmpty) {
Provider.of<Authentication>(context,listen: false)
.createAccount(
_emailController.text,_passwordController.text)
.whenComplete(() {
print('Creating collection...');
Provider.of<FirebaseOperations>(context,listen: false)
.createUserCollection(context,{
'userpassword': _passwordController.text,'useruid':
Provider.of<Authentication>(context,listen: false)
.getUserUid,'useremail': _emailController.text,'username': _fullNameController.text,'usermobile': _phoneNumberController.text,'userimage':
Provider.of<ImageSelect>(context,listen: true)
.getUserAvatarUrl,});
}).whenComplete(() {
Navigator.pushReplacement(
context,MaterialPageRoute(
builder: (context) => HomeScreen()));
});
} else {
warningText(context,'Fill all the data!');
}
},
错误代码:
I/flutter (30433): Image uploaded!
I/flutter (30433):
################################################https://firebasestorage.googleapis.com/v0/b/bubblez-
e2801.appspot.com/o/userProfileAvatar%2F2021-03-25%2011%3A34%3A39.688986?alt=media&token=78a2be55-
b45c-453e-a398-02a363178d9d
E/flutter (30433): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Looking up a
deactivated widget's ancestor is unsafe.
E/flutter (30433): At this point the state of the widget's element tree is no longer stable.
E/flutter (30433): To safely refer to a widget's ancestor in its dispose() method,save a reference
to the ancestor by calling dependOnInheritedWidgetOfExactType() in the widget's
didChangeDependencies() method.
E/flutter (30433): #0 Element._debugCheckStateIsActiveForAncestorLookup.<anonymous closure>
package:flutter/…/widgets/framework.dart:3864
E/flutter (30433): #1 Element._debugCheckStateIsActiveForAncestorLookup
package:flutter/…/widgets/framework.dart:3878
E/flutter (30433): #2 Element.getElementForInheritedWidgetOfExactType
package:flutter/…/widgets/framework.dart:3905
E/flutter (30433): #3 Provider._inheritedElementOf
package:provider/src/provider.dart:327
E/flutter (30433): #4 Provider.of
package:provider/src/provider.dart:284
E/flutter (30433): #5 FirebaseOperations.uploadUserAvatar.<anonymous closure>
package:bubblez/…/authMethods/FirebaseOperations.dart:27
E/flutter (30433): #6 _rootRunUnary (dart:async/zone.dart:1362:47)
E/flutter (30433): #7 _CustomZone.runUnary (dart:async/zone.dart:1265:19)
E/flutter (30433): #8 _FutureListener.handleValue (dart:async/future_impl.dart:152:18)
E/flutter (30433): #9 Future._propagateToListeners.handleValueCallback
(dart:async/future_impl.dart:704:45)
E/flutter (30433): #10 Future._propagateToListeners (dart:async/future_impl.dart:733:32)
E/flutter (30433): #11 Future._completeWithValue (dart:async/future_impl.dart:539:5)
E/flutter (30433): #12 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:254:13)
E/flutter (30433): #13 MethodChannelReference.getDownloadURL
(package:firebase_storage_platform_interface/src/method_channel/method_channel_reference.dart)
package:firebase_storage_platform_interface/…/method_channel/method_channel_reference.dart:1
E/flutter (30433): <asynchronous suspension>
E/flutter (30433):
I/flutter (30433): Fetching user data
E/flutter (30433): [ERROR:flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception:
NoSuchMethodError: The method '[]' was called on null.
E/flutter (30433): Receiver: null
E/flutter (30433): Tried calling: []("username")
E/flutter (30433): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)
E/flutter (30433): #1 FirebaseOperations.initUserData.<anonymous closure>
package:bubblez/…/authMethods/FirebaseOperations.dart:50
E/flutter (30433): #2 _rootRunUnary (dart:async/zone.dart:1362:47)
解决方法
你的问题出在这个函数上
Future initUserData(BuildContext context) async {
return FirebaseFirestore.instance
.collection('users')
.doc(Provider.of<Authentication>(context,listen: false).getUserUid)
.get()
.then((doc) {
print('Fetching user data')});}
因为在您的调试控制台中,我读到了 Image uploaded!
行,您能否确认图像 URL 和用户名已发布到 firestore?
尝试将其更改为:
Future initUserData(BuildContext context) async {
return await FirebaseFirestore.instance //<=== adding await here
.collection('users')
.doc(Provider.of<Authentication>(context,listen: false).getUserUid)
.get()
.then((doc) {
initUserName = doc.data()['username'];
initUserEmail = doc.data()['useremail'];
initUserImage = doc.data()['userimage'];
print(initUserName);
print(initUserEmail);
print(initUserImage);
notifyListeners();
});
}
并更新发生的事情。因为您的错误日志还说 ['username'] 被调用为 null,这只是您的第一个查询,所以它没有达到图像或电子邮件的目的。
如果这不起作用,我们可以尝试使用传递给您的提供程序函数的 BuildContext。
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