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I am currently working on a React-Native app with some Native Android code. I have some local notification functionality that I've set up on the Android side of things, but I need it to share a data store with my React Native code.

I know this is a pretty strange use-case, but given some larger restrictions imposed on the project, I can't rely on existing libraries for notifications.

Is there a way for the javascript part of my app to share a local, persisted storage solution with my native Android code? I'd love to be able to use something as simple as AsyncStorage or Realm in React-Native, and simply be able to read/write to that same store in my Native code, but my initial google searches turned up nothing.

Is anyone familiar with doing this? Would appreciate any guidance or advice!

If you simply want something like AsyncStorage, use below library to set and get data in SharedPreferences.

https://github.com/sriraman/react-native-shared-preferences

To set and get data in React Native Javascript, just import SharedPreferences and use it like this:

SharedPreferences.setItem("key_of_data","data to store"); 
SharedPreferences.getItem("key_of_data", function(value) 
// fetched data is accessible here 
);

To set and get data in Android Native:
https://developer.android.com/reference/android/content/SharedPreferences

SharedPreferences settings = getApplicationContext().getSharedPreferences("wit_player_shared_preferences", getApplicationContext().MODE_PRIVATE);

Get data:

String dataToFetch = settings.getString("key_of_data", null);

Set data:

SharedPreferences.Editor editor = settings.edit();
editor.putString("key_of_data", "data to store");
editor.commit();

Note: For now you'll have to use this shared name only: "wit_player_shared_preferences"