App.tsx

import React from "react";
import { StatusBar, StyleSheet, View, YellowBox } from "react-native";
import AppNavigator from "./src/navigation/AppNavigator";
import env from "./src/config/env";
import { AppLoading, Asset, Localization } from "expo";
import { SafeAreaView } from "react-navigation";
import colors, { currentTheme } from "./src/config/colors";

YellowBox.ignoreWarnings(["Require cycle:"]);

if (env.IS_ANDROID) {
  SafeAreaView.setStatusBarHeight(0);
}

export default class App extends React.Component {
  state = {
    isLoadingComplete: false
  };
  render() {
    if (!this.state.isLoadingComplete) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      return (
        <View style={styles.container}>
          {env.IS_IOS && <StatusBar barStyle="default" />}
          {env.IS_ANDROID && (
            <StatusBar backgroundColor={colors.WHITE} barStyle="dark-content" />
          )}
          <AppNavigator />
        </View>
      );
    }
  }
  _loadResourcesAsync = async () => {
    return Promise.all([
      currentTheme().name === "green"
        ? Asset.loadAsync([require("./assets/green/logo.png")])
        : Asset.loadAsync([require("./assets/yellow/logo.png")]),
      Localization.getLocalizationAsync()
    ]);
  };

  _handleLoadingError = (error: 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"
  }
});