App.js

import React from "react";
import { Platform, StatusBar, StyleSheet, View } from "react-native";
import { AppLoading, Asset, Font, Icon } from "expo";
import AppNavigator from "./navigation/AppNavigator";
import Splash from "./components/Loading/Splash";

export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { isLoading: true, isLoadingComplete: false };
    setTimeout(() => {
      this.setState({ isLoading: false });
    }, 3000);
  }

  render() {
    const { isLoading } = this.state;
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      let mainScreen = isLoading === true ? <Splash /> : <AppNavigator />;
      return (
        <View style={styles.container}>
          {Platform.OS === "ios" && <StatusBar barStyle="default" />}
          {mainScreen}
        </View>
      );
    }
  }
  

  _loadResourcesAsync = async () => {
    return Promise.all([
      Asset.loadAsync([
        require('./assets/images/robot-dev.png'),
        require('./assets/images/robot-prod.png'),
      ]),
      Font.loadAsync({
        // This is the font that we are using for our tab bar
        ...Icon.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
        'space-mono': require('./assets/fonts/SpaceMono-Regular.ttf'),
      }),
    ]);
  };

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

  _handleFinishLoading = () => {
    this.setState({ isLoadingComplete: true });
  };
}

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