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

Digging through the Android source found WindowManagerService which seems to have a public method (startAppFreezingScreenLocked) for activating this. This may be a good place to start looking for your answer, as unfortunately it doesn't seem as though you can directly get a WindowManagerService object.