App.js

import React from 'react';
import { StyleSheet, Text, View, Button, Image } from 'react-native';

class Greeting extends React.Component {
  render() {
    return (
      <Text>Hello {this.props.name}!</Text>
    );
  }
}

class Bananas extends React.Component {
  render() {
    let pic = {
      uri: 'https://upload.wikimedia.org/wikipedia/commons/d/de/Bananavarieties.jpg'
    };
    return (
      <Image source={pic} style={{width: 193, height: 110}}/>
    );
  }
}

export default class App extends React.Component {
  render() {
    let buttonPressed = function() {
      console.log("Hello, world");
    }
    
    return (
      <View style={styles.container}>
        <Text>Open up App.js to start working on your app!</Text>
        <Text>Changes you make will automatically reload.</Text>
        <Text>Shake your phone to open the developer menu.</Text>
        <Button
          title="Hello, world"
          onPress={buttonPressed}
          color="#aabbcc"
        />
        <Greeting name="Oscar" />
        <Bananas/>
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
});