App.js

import { AppLoading, Notifications } from 'expo';
import { Asset } from 'expo-asset';
import * as Font from 'expo-font';
import React, { useState } from 'react';
import { Platform, StatusBar, StyleSheet, View } from 'react-native';
import { Ionicons } from '@expo/vector-icons';

import AppNavigator from './navigation/AppNavigator';

/* Fix "setting a timer for a long period of time" warning */
import { InteractionManager} from 'react-native';

const _setTimeout = global.setTimeout;
const _clearTimeout = global.clearTimeout;
const MAX_TIMER_DURATION_MS = 60 * 1000;
if (Platform.OS === 'android') {
// Work around issue `Setting a timer for long time`
// see: https://github.com/firebase/firebase-js-sdk/issues/97
  const timerFix = {};
  const runTask = (id, fn, ttl, args) => {
    const waitingTime = ttl - Date.now();
    if (waitingTime <= 1) {
      InteractionManager.runAfterInteractions(() => {
        if (!timerFix[id]) {
          return;
        }
        delete timerFix[id];
        fn(...args);
      });
      return;
    }

    const afterTime = Math.min(waitingTime, MAX_TIMER_DURATION_MS);
    timerFix[id] = _setTimeout(() => runTask(id, fn, ttl, args), afterTime);
  };

  global.setTimeout = (fn, time, ...args) => {
    if (MAX_TIMER_DURATION_MS < time) {
      const ttl = Date.now() + time;
      const id = '_lt_' + Object.keys(timerFix).length;
      runTask(id, fn, ttl, args);
      return id;
    }
    return _setTimeout(fn, time, ...args);
  };

  global.clearTimeout = id => {
    if (typeof id === 'string' && id.startsWith('_lt_')) {
      _clearTimeout(timerFix[id]);
      delete timerFix[id];
      return;
    }
    _clearTimeout(id);
  };
}

export default function App(props) {

  const [isLoadingComplete, setLoadingComplete] = useState(false);

  if (!isLoadingComplete && !props.skipLoadingScreen) {
    return (
      <AppLoading
        startAsync={loadResourcesAsync}
        onError={handleLoadingError}
        onFinish={() => handleFinishLoading(setLoadingComplete)}
      />
    );
  } else {
    return (
      <View style={styles.container}>
        {Platform.OS === 'ios' && <StatusBar barStyle="dark-content" />}
        <AppNavigator />
      </View>
    );
  }
}

async function loadResourcesAsync() {
  await Promise.all([
    Asset.loadAsync([
      require('./assets/images/robot-dev.png'),
      require('./assets/images/robot-prod.png'),
    ]),
    Font.loadAsync({
      Roboto: require('native-base/Fonts/Roboto.ttf'),
      Roboto_medium: require('native-base/Fonts/Roboto_medium.ttf'),
      // This is the font that we are using for our tab bar
      ...Ionicons.font,
      // We include SpaceMono because we use it in HomeScreen.js. Feel free to
      // remove this if you are not using it in your app
    }),
  ]);
}

function handleLoadingError(error) {
  // In this case, you might want to report the error to your error reporting
  // service, for example Sentry
  console.warn(error);
}

function handleFinishLoading(setLoadingComplete) {
  setLoadingComplete(true);
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
  },
});