text: /**
   * Sample React Native App
   * https://github.com/facebook/react-native
   * @flow
   */
  
  import React, { Component } from 'react';
  import SimpleApp from './src/class04/SimpleApp';
  import {
    AppRegistry,
    StyleSheet,
    Text,
    View
  } from 'react-native';
  
  export default class ReactNavigationDemo extends Component {
    render() {
      return (
          <SimpleApp />
      );
    }
  }
  
  AppRegistry.registerComponent('ReactNavigationDemo', () => ReactNavigationDemo);
  