Changing the Orientation Smoothly for SDK from App

I know the question related to orientation has been asked multiple times, but I am facing some weird issue. I am working on one SDK that has some Activity which can be opened from the App, The SDK asks for the orientation values from the App and I am updating the orientation in onCreate() of the Activity by setting:

requestedOrientation = orientation

It works perfectly when I am holding the device in the same orientation as the orientation is set by App. But If I am holding the device in portrait mode and setting the requestedOrientation to LANDSCAPE then my screen flickers, 1st it shows the portrait screen and then goes to landscape. In manifest I have set the configChanges to android:configChanges="keyboard|keyboardHidden|screenSize" I have separate layouts for both the orientations. Let me know, if anything else is also required.

from Changing the Orientation Smoothly for SDK from App