This application is the best solution On-Off screen.

Main feature:
+ Double Tap home screen to turn off screen.
+ Double Tap power icon on Always On Display for support S7, S7E android Nougat, Note 7 and new Samsung smartphones which have Always On Display feature.

This application need to be enabled in Accessibility to use service of system..
It will save battery, support unlock by fingerprint and no Overlay Screen Detected on android M up.

===>NOTICE: We need admin permission to lock screen, so you cannot UNINSTALL application from home screen. Please go to app click more menu and select uninstall

If you have any problem please give us some comment, we'll improve it.
Thank you very much!
From version Double Tap 2017 1.1.3:
All versions
February 28, 2017