Android: Capture event when orientation change from portrait to reversePortait

Question

My application supports portrait mode only including the upside down view. Hence I've got the following in the menifest:

android:screenOrientation="sensorPortait"

Also the following to capture orientation change events:

android:configChanges="orientation|keyboardHidden"

But onConfigurationChanged event is not fired with portrait only supported application.

I need to catch the event when the application changes orientation from normal portrait to reverse portrait. Any idea?