App.js

import React, { Component } from 'react';
import { Platform, StyleSheet, Text, View } from 'react-native';
import Preview from './src/screens/Preview';
import {NavigationContainer} from '@react-navigation/native';
import { createStackNavigator } from '@react-navigation/stack';
import Home from './src/screens/Home';
const instructions = Platform.select({
  ios: 'Press Cmd+R to reload,\n' + 'Cmd+D or shake for dev menu',
  android: 'Double tap R on your keyboard to reload,\n' + 'Shake or press menu button for dev menu',
});

export default class App extends Component {
  render() {const Stack = createStackNavigator();

    return (
        <NavigationContainer>
          <Stack.Navigator>
            <Stack.Screen name="Home" component={Home} />
            <Stack.Screen name="Preview">
              {props => <Preview {...props} />}
            </Stack.Screen>
          </Stack.Navigator>
        </NavigationContainer>

    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});