PushNotification.js

import { useState, useEffect, useRef } from "react";
import {
  Text,
  View,
  Button,
  Platform,
  StyleSheet,
  TouchableOpacity,
} from "react-native";
import * as Device from "expo-device";
import * as Notifications from "expo-notifications";

Notifications.setNotificationHandler({
  handleNotification: async () => ({
    shouldShowAlert: true,
    shouldPlaySound: false,
    shouldSetBadge: false,
  }),
});

export default function PushNotification() {
  const [expoPushToken, setExpoPushToken] = useState("");
  const [notification, setNotification] = useState(false);
  const notificationListener = useRef();
  const responseListener = useRef();

  useEffect(() => {
    registerForPushNotificationsAsync().then((token) =>
      setExpoPushToken(token)
    );

    notificationListener.current =
      Notifications.addNotificationReceivedListener((notification) => {
        setNotification(notification);
      });

    responseListener.current =
      Notifications.addNotificationResponseReceivedListener((response) => {
        console.log(response);
      });

    return () => {
      Notifications.removeNotificationSubscription(
        notificationListener.current
      );
      Notifications.removeNotificationSubscription(responseListener.current);
    };
  }, []);

  return (
    <View
      style={{
        margin: 10,
      }}
    >
      <TouchableOpacity
        style={{
          backgroundColor: "#3ba0fc",
          paddingHorizontal: 25,
          paddingVertical: 15,
          borderRadius: 12,
        }}
        onPress={async () => {
          await schedulePushNotification();
        }}
      >
        <Text style={{ color: "white" }}>Day 12</Text>
      </TouchableOpacity>
    </View>
  );
}

async function schedulePushNotification() {
  await Notifications.scheduleNotificationAsync({
    content: {
      title: "You've got mail! 📬 from Bombay Rotary Club ",
      body: `"Remember that the happiest people are
      not those getting more, but those giving
      more." - H. Jackson Brown Jr.`,
      data: { data: "goes here" },
    },
    trigger: { seconds: 2 },
  });
}

async function registerForPushNotificationsAsync() {
  let token;

  if (Platform.OS === "android") {
    await Notifications.setNotificationChannelAsync("default", {
      name: "default",
      importance: Notifications.AndroidImportance.MAX,
      vibrationPattern: [0, 250, 250, 250],
      lightColor: "#FF231F7C",
    });
  }

  if (Device.isDevice) {
    const { status: existingStatus } =
      await Notifications.getPermissionsAsync();
    let finalStatus = existingStatus;
    if (existingStatus !== "granted") {
      const { status } = await Notifications.requestPermissionsAsync();
      finalStatus = status;
    }
    if (finalStatus !== "granted") {
      alert("Failed to get push token for push notification!");
      return;
    }
    token = (await Notifications.getExpoPushTokenAsync()).data;
    console.log(token);
  } else {
    alert("Must use physical device for Push Notifications");
  }

  return token;
}