This application is the best solution On-Off screen

For all smartphones:
+ Double Tap home screen to turn off screen.
+ Cover proximity sensor to turn on screen.

For new Samsung Smartphone as S7S7E android Nougat
+ Double Tap power icon to turn on screen.

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!