import React from 'react';

import { View, Button, Alert } from 'react-native';

export default function App() {

  const showAlert = () => {

    Alert.alert('Hello World');

  };

  return (

    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>

      <Button title="Click Here" onPress={showAlert} />

    </View>

  );

}