I am working on a project that includes both, an Android app and a custom AOSP built. Inside of the app that is running as a regular user (in this case user with id 10), I am downloading a file to Environment.getExternalStoragePublicDirectory()) which I want to access from a privileged platform service running as user 0. Reading files from other locations (e.g. /data/local/temp) inside of the platform service works but as soon as I am trying to access a user directory, I get permission denied because of linux ACLs (EACCES exception).

Additional facts:

• Android Version 15
• Kotlin

Any idea how I can achieve downloading the files with a regular user and then passing them to the system user inside of the platform?

I tried:

• FileProviders -> obviously not working because it is intended to share files between two apps running as the same user
• hardcoding some sdcard path -> not working because android studio complains that you should not do that