Hi, I tried this on RN 0.30 but ended up with compilation error.
Sudharsana Rajalingam

Hey Sudharsana. It actually looks like you might be missing some imports:

import com.facebook.react.bridge.ActivityEventListener;
import com.facebook.react.bridge.Callback;

I recommend using Android Studio when working on this stuff because it really helps to catch this sort of thing. I should update this post and get a github repo going though. Maybe later this week.

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