I have a device with a built-in secondary display (i.e., a physical display). I can root that device and access its configuration and file system.
I'm looking for a way to restrict access to the secondary display, something along the lines of "only apps with permission X can launch activities on the secondary display". Is there a way to do that?
I've already looked into Android's Multi-Display "Recommended practices" page but it seems to me the information there is only relevant for virtual displays that are created on the fly?