react-native-overlay-view/example/App.js

import React, { Component } from 'react'
import { AppRegistry, ActivityIndicator, View, Text } from 'react-native'
import Overlay from 'react-native-overlay-view'

const App = (props) => (
  <View style={{
    flex: 1,
    backgroundColor: 'red',
    justifyContent: 'center'
  }}>
    <Overlay onPress={() => alert('Pressed')}>
      <ActivityIndicator size='large' animating />
    </Overlay>
  </View>
)

AppRegistry.registerComponent('example', () => App)