从Android KitKat调用Azure IoT文件上传会返回BAD_FORMAT。

Question

我试图将.png文件上传到Azure IoT Hubs，但由于某些原因，我不断收到BAD_FORMAT。我使用的是 com.microsoft.azure.sdk.iot:iot-device-client:1.14.2。 库，因为我需要使用一个相当老的安卓设备（KitKat版本）。

我正在使用的代码。

    public void btnFileUploadOnClick(View v) throws URISyntaxException, IOException
    {
        Log.i("IoT App","Uploading file to IoT Hub...");

        EditText text = (EditText)findViewById(R.id.editTextFileName);
        String fullFileName = text.getText().toString();

        try
        {
            File directory = Environment.getExternalStorageDirectory();
            File file = new File(directory, "payments.json");

            InputStream inputStream = new FileInputStream(file);
            long streamLength = file.length();

            if(file.isDirectory())
            {
                throw new IllegalArgumentException(fullFileName + " is a directory, please provide a single file name, or use the FileUploadSample to upload directories.");
            }
            else
            {
                client.uploadToBlobAsync("payments", inputStream, streamLength, new FileUploadStatusCallBack(), null);
            }

            Log.i("IoT App","File upload started with success");
            Log.i("IoT App","Waiting for file upload callback with the status...");
        }
        catch (Exception e)
        {
            Log.e("IoT App","Exception while sending event: " + e.getMessage());
        }
    }

    protected class FileUploadStatusCallBack implements IotHubEventCallback
    {
        public void execute(IotHubStatusCode status, Object context)
        {
            Log.i("IoT App","IoT Hub responded to file upload operation with status " + status.name());
            TextViewControl.log("IoT Hub responded to file upload operation with status " + status.name());
        }
    }

我有这个文件 payments.json 设备（仿真器）中。

希望能得到帮助