Используйте приложение APKPure
Историческую версию Screen Off можно получить на Android
Иконка с плавающей во всех ваших APP
Turn off the screen and lock it in one click without touching the power button with "Screen Off Floating".
Preserve power button.
You have a floating icon above each app, which you can drag wherever you want.
YOU CAN USE:
◆ Floating icon in all your App
◆ Notification
◆ Shortcut in home-screen
◆ Google Now button shortcut
This app uses the Device Administrator permission.