Question

更新：较小的文件（<1 MB）似乎可以正常工作。

我正在尝试将文件从flutter应用程序上载到Firebase Storage，但是该文件没有上载，uploadTask.onComplete立即完成。在尝试使用return (await storageRef.getDownloadURL());获取URL之前，我不会出错。

以下是相关代码：

_uploadFile(file) async {
    String fileName = DateFormat('yy-MM-ddTH:mm:s').format(DateTime.now()).toString() + file.split('/').last;
    StorageReference storageRef = FirebaseStorage.instance.ref().child(fileName);
    StorageUploadTask uploadTask = storageRef.putFile(File(file));
    await uploadTask.onComplete;
    return (await storageRef.getDownloadURL());
  }

错误：

I/flutter (20165): PlatformException(download_error, Object does not exist at location., null)
E/flutter (20165): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(download_error, Object does not exist at location., null)
E/flutter (20165): #0      _AddNewsState._uploadFile (package:ny_skolapp/add_news.dart:39:7)
E/flutter (20165): <asynchronous suspension>
E/flutter (20165): #1      _AddNewsState._uploadNews (package:ny_skolapp/add_news.dart:49:25)
E/flutter (20165): #2      _AddNewsState.build.<anonymous closure> (package:ny_skolapp/add_news.dart:329:31)
E/flutter (20165): #3      _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:706:14)
E/flutter (20165): #4      _InkResponseState.build.<anonymous closure> (package:flutter/src/material/ink_well.dart:789:36)
E/flutter (20165): #5      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
E/flutter (20165): #6      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:486:11)
E/flutter (20165): #7      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:264:5)
E/flutter (20165): #8      BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:199:7)
E/flutter (20165): #9      PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:467:9)
E/flutter (20165): #10     PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:76:12)
E/flutter (20165): #11     PointerRouter._dispatchEventToRoutes.<anonymous closure> (package:flutter/src/gestures/pointer_router.dart:117:9)
E/flutter (20165): #12     _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:379:8)
E/flutter (20165): #13     PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:115:18)
E/flutter (20165): #14     PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:101:7)
E/flutter (20165): #15     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:218:19)
E/flutter (20165): #16     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:198:22)
E/flutter (20165): #17     GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:156:7)
E/flutter (20165): #18     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:102:7)
E/flutter (20165): #19     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:86:7)
E/flutter (20165): #20     _rootRunUnary (dart:async/zone.dart:1138:13)
E/flutter (20165): #21     _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter (20165): #22     _CustomZone.runUnaryGuarded (dart:async/zone.dart:933:7)
E/flutter (20165): #23     _invoke1 (dart:ui/hooks.dart:273:10)
E/flutter (20165): #24     _dispatchPointerDataPacket (dart:ui/hooks.dart:182:5)
E/flutter (20165):

调用_uploadFile（file）的代码如下：

_uploadNews() async {
    setState(() {
      _uploading = true;
    });
    if (_img != null) {
      if (!_img.contains('http')) {
        _imgUrl = await _uploadFile(_img);
      }else{
        _imgUrl = _img;
      }
    }
    if (_file.isNotEmpty) {
      for (int i = 0; i < _file.length; i++) {
        if (!_file[i].contains('http')) {
          _fileUrl.add(await _uploadFile(_file[i]));
        }else{
          _fileUrl.add(_file[i]);
        }
      }
    }
    await Firestore.instance
        .collection('news')
        .document('$_title ${DateFormat('yyyy-MM-dd  kk:mm').format(DateTime.now())}')
        .setData({
      'title': _title,
      'content': _content ?? '',
      'time': Timestamp.now(),
      'img': _imgUrl ?? '',
      'files': _fileUrl ?? [],
      'fileNames': _fileName ?? [],
    });
    setState(() {
      _uploading = false;
    });
    Navigator.of(context).pop();
  }

_uploadNews(_img)和_uploadNews(_file)有相同的问题。

在onPressed中，使用以下代码用两个不同的按钮设置_img和_file：

_img = await FilePicker.getFilePath(type: FileType.ANY);

和

_file.add(await FilePicker.getFilePath(type: FileType.ANY));

file来自FilePicker.getFilePath(type: FileType.ANY)，但我没有得到任何错误，所以我知道该文件存在。

Answer 1

首先，您说使用return (await storageRef.getDownloadURL());时遇到错误，可以确定是哪个错误。

然后，您可以尝试使用类似的代码来上传文件并捕获错误：

Future<String> _uploadFile(String filePath) async {
   try {
      final String fileName = DateFormat('yy-MM-ddTH:mm:s').format(DateTime.now()).toString() + filePath.split('/').last;
      final StorageReference storageRef = FirebaseStorage.instance.ref().child(fileName);
      final StorageUploadTask task = storageRef.putFile(File(filePath));
      return await (await task.onComplete).ref.getDownloadURL();
   } catch (error) {
      print(error.toString());
      throw error.toString();
   }
}

我使用了与此代码相似的代码，直到现在一直有效。

文件未上传到Firebase存储

1 个答案: