I am writing my own ViewManager which does need to get activity instance. Before version 0.29 it was straight forward, but after RN@0.29 breaking changes I can't find a way to do it.
Next React Native version will have the
reactContext.getCurrentActivity() method exposed publicly rather than just being available when extending
Update: I've just confirmed that this change will be cherry-picked into 0.31 and will land in few days.