How to set maximum time to lock?

I'm trying to set the maximum time to lock with DevicePolicyManager.s开发者_如何学运维etMaximumTimeToLock(), but this seems to have no effect. Admin-mode is enabled and lockNow() works without a problem. Is there anything else that needs to be done to use setMaximumTimeToLock() ?

tgr

---

Are trying to keep your screen from going off? Use this in your onCreate. I believe it has to go before calling setContentView.

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);