Mount Notification module in App.js

App.js

import { AppRegistry, View, StyleSheet, AppState } from 'react-native';
import App from './App';
import React from 'react';
import { Provider } from 'react-redux';
import configureStore from './configureStore';

import HandleNotifications from "./src/components/HandleNotifications/HandleNotifications";

const store = configureStore();

const AppContainer = () =>  
    <Provider store={store}>
        <View style={{ flex: 1, justifyContent: 'center', backgroundColor: 'white' }}>
            <App/>
            <HandleNotifications />
        </View>
    </Provider>;

AppRegistry.registerComponent('GreatApp', () => AppContainer); // GreatApp your app name