App.js

import React, { Component } from 'react';
import { Platform, StyleSheet, Text, View } from 'react-native';
import GLViewTest from './GLViewTest';

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() {
    return (
      <>
        <View style={styles.container}>
          <Text style={styles.welcome}>Welcome to React Native!</Text>
          <Text style={styles.instructions}>To get started, edit App.js</Text>
          <Text style={styles.instructions}>{instructions}</Text>
        </View>
        <View style={{ flex: 1, backgroundColor: 'blue' }}>
          <GLViewTest />
        </View>
      </>
    );
  }
}

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,
  },
});