public void uploadFile(string filename, int size)
        {
            Debug.Log("upload file start.");

            byte[] data = new byte[size];

            StorageReference storageReference = mAGCStorageManagement.getStorageReference(filename);

            UploadTask task = storageReference.putBytes(data, new FileMetadata());

            task.addOnFailureListener(new MyFailureListener())
            .addOnSuccessListener(new MySuccessListener())
            .addOnProgressListener(new MyProgressListener())
            .addOnPausedListener(new MyPausedListener());

            StorageTask.ErrorResult err = new MyErrorResult();
            Exception e = err.getError();

            task.setResult(err.obj);
            err = task.getResult();
            if (err == null)
            {
                Debug.Log("uploadFileTest fail, getResult err is null.");
                return;
            }

            StorageTask.ErrorResult timePointState = task.getTimePointState();
            if (timePointState == null)
            {
                Debug.Log("uploadFileTest fail, getTimePointState result is null.");
                return;
            }

            Exception exp = task.getException();

            if (exp == null)
            {
                Debug.Log("uploadFileTest fail, getException result is null.");
                return;
            }

            task.setException(exp);

            AndroidJavaObject ajObj = task.getResultThrowException(new AndroidJavaClass("java.lang.Exception"));

            if (ajObj == null)
            {
                Debug.Log("uploadFileTest fail, getException result is null.");
                return;
            }


            Debug.Log("upload file test success.");
        }
        private void downloadTest()
        {
            Debug.Log("downloadTest start");
            StorageReference reference = mAGCStorageManagement.getStorageReference(storageFileName);

            Debug.Log("getStorageReference end");
            string downloadFilePath = downloadFileFolder + "downloadTest.cpp";

            Debug.Log("downloadFilePath: " + downloadFilePath);
            File file = new File(downloadFilePath);

            try
            {
                DownloadTask task = reference.getFile(file);
                if (task == null)
                {
                    Debug.Log("downloadTask is null");
                }
                else
                {
                    Debug.Log("downloadTask is not null");
                    StorageTask.ErrorResult err = new MyErrorResult();
                    Exception e = err.getError();

                    task.setResult(err.obj);
                    err = task.getResult();
                    if (err == null)
                    {
                        Debug.Log("downloadFileTest fail, getResult err is null.");
                        return;
                    }

                    StorageTask.ErrorResult timePointState = task.getTimePointState();
                    if (timePointState == null)
                    {
                        Debug.Log("downloadFileTest fail, getTimePointState result is null.");
                        return;
                    }

                    Exception exp = task.getException();
                    if (exp == null)
                    {
                        Debug.Log("downloadFileTest fail, getException result is null.");
                        return;
                    }

                    task.setException(exp);

                    AndroidJavaObject ajObj = task.getResultThrowException(new AndroidJavaClass("java.lang.Exception"));
                    if (ajObj == null)
                    {
                        Debug.Log("downloadFileTest fail, getException result is null.");
                        return;
                    }

                    Debug.Log("downloadTest Success");
                }
            }
            catch (System.Exception e)
            {
                Debug.Log(e);
            }
        }