firebase - Firebase存储图像无法正常上传

正在尝试将我从电话中获取的图像发送到FireBase存储。第一个函数使用图像选取器插件获取图像，并将路径返回作为上载函数的参数传递。图像上载到云存储，但在面板中，类型为application/octet-stream且图像不显示

String download_path;

var imageFile;

picker() async{
 File theImage = await ImagePicker.pickImage(
  source: ImageSource.gallery);
  imageFile = theImage;
  var theimagepath = theImage.path;
  setState(() {
  imageFile = theImage;
  });
}


Future<Null> uploadFile(String myfilepath)async{
    final RegExp regExp = RegExp('([^?/]*\.(jpg))');
    final filename = regExp.stringMatch(myfilepath);
    final Directory tempDir = Directory.systemTemp;
    final File thefile = await File('${tempDir.path}/$filename').create();


    final StorageReference sref = FirebaseStorage.instance.ref().child('storeFolderName').child(filename);
    final StorageUploadTask uploadTask = sref.putFile(thefile);
    final Uri downloadUrl = (await uploadTask.future).downloadUrl;
    download_path = downloadUrl.toString();
    print('download url printed : $download_path');

  }
IconButton(
 icon: Icon(Icons.cloud_done),
       onPressed: (){uploadFile(imageFile.toString());
       },
),

日志输出：
D/Surface (18601): Surface::setBufferCount(this=0x9272d800,bufferCount=4)D/GraphicBuffer(18601): register, handle(0x97ee29c0) (w:480 h:854 s:480 f:0x1 u:f02)D/GraphicBuffer(18601): register, handle(0x97ee2e40) (w:480 h:854 s:480 f:0x1 u:f02)D/GraphicBuffer(18601): register, handle(0x8ea20140) (w:480 h:854 s:480 f:0x1 u:f02)W/System (18601): ClassLoader referenced unknown path: system/framework/mediatek-cta.jarI/System.out(18601): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttpI/System.out(18601): [OkHttp] sendRequest<<D/GraphicBuffer(18601): register, handle(0x8ea21040) (w:480 h:854 s:480 f:0x1 u:f02)W/System (18601): ClassLoader referenced unknown path: system/framework/mediatek-cta.jarI/System.out(18601): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttpI/System.out(18601): [OkHttp] sendRequest<<I/flutter (18601): download url printed : https://firebasestorage.googleapis.com/v0/b/cloud-fs-demo.appspot.com/o/storeFolderName%2FIMG_20180711_080138.jpg?alt=media&token=6fb05871-04df-458d-93bc-1951cd122770E/[EGL-ERROR](18601): __egl_platform_cancel_buffers:644: surface->num_buffers(4)

最佳答案

我也面临这个问题，两天后，我终于通过添加元数据contenttype来解决这个问题。有趣的是，在我的例子中，相同的代码适用于Android，但在iOS中是错误的。
下面是我使用的代码片段：

final File selectedImage = await ImagePicker.pickImage(
  source: ImageSource.gallery,
);

filePath = selectedImage.path;
currentFile = selectedImage;

final StorageReference storageRef =
    FirebaseStorage.instance.ref().child('images');
final StorageUploadTask task = storageRef.child('myImage.jpeg').putFile(selectedImage, StorageMetadata(contentType: 'image/jpeg'));
await task.onComplete; // do something

因此，如果没有putfile方法的storagemetadata，图像将以application/octet流的形式上载（仅在iOS上）。但是元数据对我来说很好。希望有帮助。