How to set orientation to portrait mode, regardless the auto-rotate in Android / React Native

I want to set portrait mode in my react native android application, I tried to

1. set android:screenOrientation="portrait" in my Android Manifest.xml file,
2. adding orientation programmatically in my activity as setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); but none of these is working.

Note: I have added react-native-navigation in my project

Any inputs to resolve this? Thanks.