Downloading 'App data' files from Google Drive using the Android Drive SDK

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http://stackoverflow.com – I had the google drive sdk quick start for android up and running. What I am trying to do is to expand the application to be able to upload a file on the drive new 'App Data' folder and be able to download this file back again (Sync config files between android devies) Uploading a file works fine. But When I try to download the same file, I can get its meta data like fileID, fileTitle, fileDownloadURL etc but can not download the the contents. I receive 401 Unauthorized error while trying. I am usnig AUTH SCOPE "https://www.googleapis.com/auth/drive.appdata" to access appdata. Any Idea why (HowTos)