【发布时间】：2020-06-04 13:13:54
【问题描述】：
The method 'existsSync' was called on null.
Receiver: null
Tried calling: existsSync()
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 StorageReference.putFile (package:firebase_storage/src/storage_reference.dart:62:17)
#2 _UploadState.uploadImage (package:focal/pages/upload.dart:402:10)
#3 _UploadState.handleVideoSubmit (package:focal/pages/upload.dart:507:30)
<asynchronous suspension>
#4 _UploadState.buildUploadForm.<anonymous closure> (package:focal/pages/upload.dart:613:27)
#5 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:779:19)
#6 _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:862:36)
#7 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#8 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)
#9 BaseTapGestureRecognizer._chec<…>
这个错误是什么意思 我刚刚上传了一个视频文件，它给了我这个错误。
这是我上传视频的代码
final StorageReference storageRef = FirebaseStorage.instance.ref();
Future<String> uploadVideo(videoFile, String postId) async {
StorageUploadTask uploadTask = storageRef
.child(
'post_/$postId/${widget.currentuser.username}',
)
.putFile(videoFile);
String thumbnail = 'post_/$postId/${widget.currentuser.username}';
setState(() {
thumbnailLocation = thumbnail;
});
StorageTaskSnapshot storageSnap = await uploadTask.onComplete;
String downloadUrl = await storageSnap.ref.getDownloadURL();
return downloadUrl;
}
【问题讨论】：
-
请分享您的确切小部件代码和方法。还要编辑您的问题以提高可读性。
-
见上文，你很可能在执行 existsSync(value) ，其中 value 为空。 Console.log 将您传递给函数的值
-
该错误表示没有文件，您需要分享您的代码以获得任何帮助
-
@PeterHaddad 我已经编辑了我的代码，看看它
标签： firebase flutter google-cloud-firestore firebase-storage