I have a situation in Lollipop where I have:

 1. Directory tree (`DocumentFile`) which is granted from user. 
 2. A collection of audio files that need to modify retrieved from media 
provider.

        Uri mediaUri = Uri.withAppendedPath(MediaStore.Audio.Media.
EXTERNAL_CONTENT_URI, 
            "45");



Then, how to write a stream into one of those files?

DocumentFile 
<https://developer.android.com/reference/android/support/v4/provider/DocumentFile.html>
 
is a new mechanism which allows us to modify files in Lollipop. It is not 
the same case with this post 
<http://stackoverflow.com/questions/7738192/how-to-get-contact-photo-uri> 

Thanks

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