App.js

import React from 'react';
import { StyleSheet, View } from 'react-native';
import { AppLoading, Font } from 'expo';
import AppNavigator from './navigation/AppNavigator';


import Colors from './constants/Colors';

export default class App extends React.Component {
  state = {
    isLoadingComplete: false,
  };

  render() {
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      return (
        <View
          style={styles.container}
        >
          <AppNavigator />
        </View>
      );
    }
  }

  _loadResourcesAsync = async () => {
    return Promise.all([
      Font.loadAsync({
        BloggerSans: require('./assets/fonts/BloggerSans.ttf'),
        BloggerSansItalic: require('./assets/fonts/BloggerSansItalic.ttf'),
        BloggerSansBold: require('./assets/fonts/BloggerSansBold.ttf'),
        Roboto: require("native-base/Fonts/Roboto.ttf"),
        Roboto_medium: require("native-base/Fonts/Roboto_medium.ttf")
      }),
    ]);
  };

  _handleLoadingError = error => {
    console.warn(error);
  };

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

const styles = StyleSheet.create({
  container: {
    flex: 1,
  }
})