App.js

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

import React, { Component } from 'react';
import {
  Platform,
  StyleSheet,
  Text,
  View,
  TouchableOpacity,
  TextInput,
  Dimensions,
  Image,
  ScrollView,
  WebView
} from 'react-native';

import { Pages } from 'react-native-pages';

import ImagenExterna from "./ImagenExterna"

export default class App extends Component<{}> {

  constructor(props, env){
    super(props, env);

    this.state = {
      colorFondo: 'yellow',
      direccion: 'https://google.com'
    }
  }

  cambiarColor(){

    this.setState({colorFondo: this.state.text})


  }

  cambiarPagina(){
    this.setState({direccion: this.state.text})
  }

  render() {
    return (
      <Pages>
        <View style={styles.container}>
          <Text style={styles.welcome}>Hola esto es un texto</Text>
        </View>
        <View style={styles.container}>
          <ImagenExterna texto="Hola" urlImagen="https://massolutions.biz/wp-content/uploads/2014/12/e5a06942fa42823c88be5f3a834e063d-fantastic-art-bat-family.jpg"/>
        </View>
        <View style={{ flex: 1, backgroundColor: 'blue' }} />
      </Pages>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: 'yellow',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
  boton: {
    backgroundColor: 'red',
    width: 300,
    height: 50,
    borderWidth: 2,
    borderColor: 'white',
    borderRadius: 15,
    alignItems: 'center',
    flexDirection: 'row'
  },
  botonVerde: {
    backgroundColor: 'green',
    width: 300,
    height: 50,
    borderWidth: 2,
    borderColor: 'white',
    borderRadius: 15,
    alignItems: 'center',
    flexDirection: 'row'
  },
  textoBoton:{
    color: 'white',
    fontSize: 20,
    textAlign: 'center',
    flex: 1
  }
});