Virtual power button equals your phone power button device
always visible your phone screen on power button
※ Accessibility services are used in this app. It's use only trun off screen or visible power menu.
1. one click to trun off screen ( lock screen )
2. long click to visible power menu (for android 5.0 device)
※ Notice :
Uninstall : Settings > Security > Device administrators to shut off Lock screen button