Android Question Catching events for folding devices

I thought I had found a solution, which was to use the phone's sensors. Scanning for all the sensors on the Galaxy Z Fold 5 and the Fold 4 (using Samsung's Remote Test Lab), I identified a series of promising looking sensors:

So I started monitoring them and folded/unfolded the phone.
The only sensor that fired was SENSOR_TYPE_HINGE_ANGLE and that was only on folding the phone. (It didn't fire on unfolding!)
Interestingly, the Fold 4 paused and resumed the B4A activity whenever the phone was folded and unfolded. This would be an ideal time to check to see if the screen size had changed, but the Fold 5 did not have this behaviour, the Fold 5 only paused and resumed the activity on folding. So that approach doesn't seem to be viable.

I have now tried doing this with the Android Emulator, and it would seem that SENSOR_TYPE_HINGE_ANGLE works as you would expect. Angles are continually generated as the screen is folded and unfolded. Perhaps Samsung's Remote Test Lab doesn't convey sensor information correctly? Or perhaps the emulator isn't behaving like a real device? I would be interested in someone with a real device testing to see if this sensor fires reliably. Thanks.

I don't have Z Fold but I have Z Flip 5, so it probably works the same way. If you want me to test any of your app please let me know.
You may also check this https://developer.samsung.com/codelab/galaxy-z/app-continuity.html

Thanks for the link, Wes. That page seems to immediately answer my query: "You need to store the position or ID of the photo, as Android destroys and recreate the activity when folding and unfolding the phone." I had assumed the activity would need to be recreated (and hence we could utilise those events) but some of the devices on Samsung's Remote Test Lab didn't behave in that way. It must be just the way the Remote Test Lab has been set up.
If you have the time, perhaps you could just run any of your apps or just create a new default app on your Flip and check that the log is recording the Activity resume and pause events when you open and close your phone:

** Activity (main) Resume **
** Activity (main) Pause, UserClosed = false **

Thanks.