Use APKPure App
Get Quick Lock old version APK for Android
Screen Off
just a Simple application,
No ads,
No background service,
No extra features,
No any permissions,
Enjoy !
Extend double times longer life of the power button.
support from android 2.2
Note:
Please activate the application in Device administrators on first time
If you want to uninstall the application,please cancel the Quick Lock in "Settings -> Security -> Device administrators", then uninstall it as normal application.