How to check the downloaded file in native/hybrid app using appium?

In my hybrid application, I have to download the file from the application. I’m getting an notification message at the bottom while downloading. But i have to check whether the file is properly downloaded or not !!! Is there any work-around/idea to carry forward this scenario???

I’m using appium 1.3.1, java client 1.6.2 & android real device with 4.4.2 OS version

Pull_File returns the encoded content of the file on device in base64. You can compare this encoded content to that of the downloaded file.