How to exit React Native app on back button pressed

In this React Native source code example, the source code below illustrate how to exit React Native app on back button pressed.

You can copy and adopt this source code example to your React Native project without reinventing the wheel.

import React, {Component} from 'react';
import {BackHandler, StyleSheet, Text, View,Alert, TouchableOpacity} from 'react-native';

export default class App extends Component {
    this.backButton = BackHandler.addEventListener('hardwareBackPress', () =>{
      return true;
  render() {
    return (
      <View style={styles.container}>
          <Text>Press the Back Button  to quit the app</Text>

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

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