Changing the 'Use New UI' setting then pressing the back button to re-display the main activity does not show the newly-selected user interface (you have to press the back button again to close the activity, then re-open it using the notification).
The old and new main activities should check whether they should be displayed in the onResume() function, and start the other activity if required.
Changing the 'Use New UI' setting then pressing the back button to re-display the main activity does not show the newly-selected user interface (you have to press the back button again to close the activity, then re-open it using the notification). The old and new main activities should check whether they should be displayed in the onResume() function, and start the other activity if required.