By design, if the user presses the power key twice within 5 seconds (panic), it will show immersive confirmation again at the next time entering immersive mode. But there is a bug on calculating the time between pressing the power key. The time get from event.getDownTime() will stop when the device is sleeping without being charged. So here uses SystemClock.elapsedRealtime() instead. https://code.google.com/p/android/issues/detail?id=80772 Change-Id: I4dca9dc260904f1c5b60464834781e2a82a9bcf4