main.js

// main.js
import Expo from 'expo';
import React from 'react';
import { StackNavigator } from 'react-navigation';
import App from './src/App';
import Film from './src/Film';
import FilmDetail from './src/Film/FilmDetail';

const routes = {
  Home: {
    name: 'Home',
    screen: App,
  },
  Film: {
    name: 'Film',
    screen: Film,
  },
  FilmDetail: {
    name: 'FilmDetail',
    screen: FilmDetail,
  },
};

const MainApp = StackNavigator(routes);

class AppContainer extends React.Component {
  render() {
    return (
      <ApolloProvider client={client}>
      <MainApp />
      </ApolloProvider>
    );
  }
}

Expo.registerRootComponent(AppContainer);