React Native Android Lifecycle events

MainActivity.java

// set up lifecycle events in Android Main Activity
private static final String TAG = "MainActivity";

  @Override
  public void onPause() {
    super.onPause();

    ReactContext reactContext = getReactInstanceManager().getCurrentReactContext();
    WritableMap params = Arguments.createMap();
    params.putString("event", "onPause");

    if(reactContext != null) {
      Objects.requireNonNull(getReactInstanceManager().getCurrentReactContext())
              .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
              .emit("ActivityStateChange", params);

    }
 
    Log.i(TAG, "onPause: ");
  }



// Cal from within React Native component    
useEffect(() => {
  DeviceEventEmitter.addListener('ActivityStateChange', e => {
    log.info(`onPause ${e.event}`);
  });

  return () => DeviceEventEmitter.removeAllListeners();
}, []);