以下是您需要如何实现它的提示

final StorageReference ref = storageRef.child("your_REF");
uploadTask = ref.putFile(file);

    Task<Uri> urlTask = uploadTask.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 ref.getDownloadUrl();
        }
    }).addOnCompleteListener(new OnCompleteListener<Uri>() {
        @Override
        public void onComplete(@NonNull Task<Uri> task) {
            if (task.isSuccessful()) {
                Uri downloadUri = task.getResult();
                String downloadURL = downloadUri.toString();
            } else {
                // Handle failures
                // ...
            }
        }
    });

有关如何实现它的更多信息,您可以检查在我回答此https://github.com/udacity/and-nd-firebase/issues/41后7天打开的这个github问题