Android - Activation of the system key lock (aka lock screen)

Question

I have to activate android\'s system key lock (the one you get when you press the power off/hang up button). See here:

Answer 1

I have been searching for an answer to the exact same question for a while. Apparently, after 2.0 onwards the device manager privileges for the app level were removed. But with Froyo - 2.2 the device policy manager is revealed granting us developers a multitude of administrative level controls.

http://developer.android.com/guide/topics/admin/device-admin.html