index.android.js

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

import React from 'react';

import {
  AppRegistry,
  Text,
  View,
  Button,
} from 'react-native';
import { StackNavigator } from 'react-navigation';

export default class HomeScreen extends React.Component {
  static navigationOptions = {
    title: 'Welcome',
  };
  render() {
    const  navigate  = this.props.navigation;
    console.log(this.props.navigation.navigate());
    return (
      <View>
        <Text>Hello, Chat App!</Text>
        <Button
          onPress={() => navigate('Chat')}
          title="Chat with Lucy"
        />
      </View>
    );
  }
}
class ChatScreen extends React.Component {
  static navigationOptions = {
    title: 'Chat with Lucy',
  };
  render() {
    return (
      <View>
        <Text>Chat with Lucy</Text>
      </View>
    );
  }
}
const Navigator = StackNavigator({
  Home: { screen: HomeScreen },
  Chat: { screen: ChatScreen },
});



AppRegistry.registerComponent('Navigator', () => Navigator);