Question

am尝试将手机拍摄的图像发送到Firebase存储。第一个函数使用图像选择器插件获取图像并传递返回的路径作为上载函数的参数。图像上载到云存储，但是在面板中类型为application/octet-stream，并且图像不显示< / p>

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.jar I/System.out(18601): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp I/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.jar I/System.out(18601): e:java.lang.ClassNotFoundException: com.mediatek.cta.CtaHttp I/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-1951cd122770 E/[EGL-ERROR](18601): __egl_platform_cancel_buffers:644: surface->num_buffers(4)

Answer 1

如果您有文件，为什么对文件发送路径对我来说真的没有意义。似乎是错误的原因是找不到文件的位置。相反，我会做这样的事情：

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(File myFile)async{

    final StorageReference sref = 
FirebaseStorage.instance.ref().child('storeFolderName').child(myFile.toString());
    final StorageUploadTask uploadTask = sref.putFile(myFile);
    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);
       },
),

Answer 2

我有同样的问题。自动检测mime类型似乎不起作用，因此我最终使用了mime包并在StorageMetadata中发送了mime类型。

Answer 3

我也遇到了这个问题，两天后终于通过添加metaData，contentType解决了这个问题。有趣的是，对于我来说，相同的代码适用于android，但对于iOS是错误的。所以这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，则图像将作为应用程序/八位字节流上传（仅在iOS上）。但是使用metaData对我来说很好。希望对您有所帮助。

Firebase存储映像无法正确上传

3 个答案: