Use APKPure App
Get LockPattern OnOff old version APK for Android
LockPattern OnOff is a widget, which allows you activate a screen pattern
LockPattern OnOff is a simple widget (1×1), which allows you quickly activate a lock screen pattern.
RE ADD WIDGET AFTER UPDATE!!!
API on 2.2 is closed now!
IF YOUR PATTERN IS EMPTY:
To setup or change patten: Setings->Security&location->Change unclock pattern