Another use-case for this is if you start playing music, lock the screen and put the phone in your pocket. Realising the volume is too low, you raise it without removing the phone from your pocket. Again, we should warn the user that they are about to cross the threshold somehow as they are not currently looking at the screen (which is off anyway).
Another use-case for this is if you start playing music, lock the screen and put the phone in your pocket. Realising the volume is too low, you raise it without removing the phone from your pocket. Again, we should warn the user that they are about to cross the threshold somehow as they are not currently looking at the screen (which is off anyway).