无法从Firebase存储检索图像的下载URL(出现异常)[需要紧急帮助] [英] Unable to retrieve image's download URL from Firebase Storage (getting exception) [NEED URGENT HELP]

问题描述

该代码已成功将图像上传到Firebase Storage，但没有返回下载URL.我该如何解决?

The code successfully uploads an image to Firebase Storage but doesn't give back the download URL. How can I fix this?

我收到此异常: java.lang.IllegalArgumentException:存储桶的根部不支持getDownloadUrl().为什么?

I get this exception: java.lang.IllegalArgumentException: getDownloadUrl() is not supported at the root of the bucket. Why?

private void uploadFile() {
    if (mImageUri != null) {
        StorageReference fileReference = mStorageRef.child(System.currentTimeMillis()
                + "." + getFileExtension(mImageUri));

        fileReference.putFile(mImageUri).continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
            @Override
            public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                if (!task.isSuccessful()) {
                    throw task.getException();
                }

                // Continue with the task to get the download URL
                return mStorageRef.getDownloadUrl();
            }
        }).addOnCompleteListener(new OnCompleteListener<Uri>() {
            @Override
            public void onComplete(@NonNull Task<Uri> task) {
                if (task.isSuccessful()) {
                    Uri downloadUri = task.getResult();
                        System.out.println("Upload success: " + downloadUri);
                } else {
                    // Handle failures
                    // ...
                }
            }
        });

    } else {
        Toast.makeText(this, "No file selected", Toast.LENGTH_SHORT).show();
    }

}

推荐答案

我认为返回下载网址存在问题，请尝试以下代码:

I think there is problem in returning downloading url, try below code:

private void uploadFile() {
    if (mImageUri != null) {
        StorageReference fileReference = mStorageRef.child(System.currentTimeMillis()
                + "." + getFileExtension(mImageUri));

        fileReference.putFile(mImageUri).continueWithTask(new Continuation<UploadTask.TaskSnapshot, Task<Uri>>() {
            @Override
            public Task<Uri> then(@NonNull Task<UploadTask.TaskSnapshot> task) throws Exception {
                if (!task.isSuccessful()) {
                    throw task.getException();
                }

                // Continue with the task to get the download URL
                //change made here
                return fileReference.getDownloadUrl();
            }
        }).addOnCompleteListener(new OnCompleteListener<Uri>() {
            @Override
            public void onComplete(@NonNull Task<Uri> task) {
                if (task.isSuccessful()) {
                    Uri downloadUri = task.getResult();
                        System.out.println("Upload success: " + downloadUri);
                } else {
                    // Handle failures
                    // ...
                }
            }
        });

    } else {
        Toast.makeText(this, "No file selected", Toast.LENGTH_SHORT).show();
    }

}

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