Simple local notification with Expo

LocalNotifications.js

import React, {Component} from 'react';
import {TextInput, View, Keyboard} from 'react-native';
import {Constants, Notifications, Permissions} from 'expo';

export default class Timer extends Component {
    onSubmit(e) {
        Keyboard.dismiss();

        const localNotification = {
            title: 'done',
            body: 'done!'
        };

        const schedulingOptions = {
            time: (new Date()).getTime() + Number(e.nativeEvent.text)
        }

        // Notifications show only when app is not active.
        // (ie. another app being used or device's screen is locked)
        Notifications.scheduleLocalNotificationAsync(
            localNotification, schedulingOptions
        );
    }

    handleNotification() {
        console.warn('ok! got your notif');
    }

    async componentDidMount() {
        // We need to ask for Notification permissions for ios devices
        let result = await Permissions.askAsync(Permissions.NOTIFICATIONS);

        if (Constants.isDevice && result.status === 'granted') {
            console.log('Notification permissions granted.')
        }

        // If we want to do something with the notification when the app
        // is active, we need to listen to notification events and 
        // handle them in a callback
        Notifications.addListener(this.handleNotification);
    }

    render() {
        return (
            <View style={{flex: 1, flexDirection: 'row', justifyContent: 'center'}}>
                <TextInput
                    onSubmitEditing={this.onSubmit}
                    placeholder={'time in ms'}
                />
            </View>
        );
    }
};

Hi,
I'm using SKD41 and Expo is currently moving the permissions to the specific dependency packages and probably won't support the "expo-permissions" in future releases. This means that you should use the getPermissionsAsync() and requestPermissionsAsync() from the expo-notifications package.

I've included a one line change inside the askNotification function into the example provided by @tomathosauce

import React, { useEffect, useState } from 'react';
import { Keyboard, TextInput, View, Button } from 'react-native';
import Constants from 'expo-constants';
import * as Notifications from 'expo-notifications';

const onSubmit = (seconds) => {
  Keyboard.dismiss();
  const schedulingOptions = {
    content: {
      title: 'This is a notification',
      body: 'This is the body',
      sound: true,
      priority: Notifications.AndroidNotificationPriority.HIGH,
      color: "blue"
    },
    trigger: {
      seconds: seconds,
    },
  };
  // Notifications show only when app is not active.
  // (ie. another app being used or device's screen is locked)
  Notifications.scheduleNotificationAsync(
    schedulingOptions,
  );
};
const handleNotification = () => {
  console.warn('ok! got your notif');
};

const askNotification = async () => {
  // We need to ask for Notification permissions for ios devices
  const { status } = await await Notifications.requestPermissionsAsync();
  if (Constants.isDevice && status === 'granted')
    console.log('Notification permissions granted.');
};

const TimerNotification = () => {
  const [text, onChangeText] = useState("");

  useEffect(() => {
    askNotification();
    // If we want to do something with the notification when the app
    // is active, we need to listen to notification events and
    // handle them in a callback
    const listener = Notifications.addNotificationReceivedListener(handleNotification);
    return () => listener.remove();
  }, []);

  return (
  <View>
    <TextInput
        onChangeText={onChangeText}
        value={text}
        placeholder="Seconds"
        style={{fontSize: 30, borderWidth: 1, width: 300}}
        keyboardType="numeric"
    />
    <Button onPress={() => onSubmit(Number(text))} title="Schedule"/>
  </View>)
};

export default TimerNotification

I hope this helps someone out 😊

tried both @tomathosauce and @whiteclouds7 successfully with sdk40. Thank you for an awesome gist.

There aren't any changes in SDK version 43 compared to @whiteclouds7 proposed solution but here follows a refined example that is also working in TypeScript:

import { registerRootComponent } from 'expo';
import { PermissionStatus } from 'expo-modules-core';
import * as Notifications from 'expo-notifications';
import { Notification } from 'expo-notifications';
import React, { useEffect, useState } from 'react';
import { Button, StyleSheet, View } from 'react-native';

const App = () => {
  const [notificationPermissions, setNotificationPermissions] = useState<PermissionStatus>(
    PermissionStatus.UNDETERMINED,
  );

  const scheduleNotification = (seconds: number) => {
    const schedulingOptions = {
      content: {
        title: 'This is a notification',
        body: 'This is the body',
        sound: true,
        priority: Notifications.AndroidNotificationPriority.HIGH,
        color: 'blue',
      },
      trigger: {
        seconds: seconds,
      },
    };
    Notifications.scheduleNotificationAsync(schedulingOptions);
  };

  const handleNotification = (notification: Notification) => {
    const { title } = notification.request.content;
    console.warn(title);
  };

  const requestNotificationPermissions = async () => {
    const { status } = await Notifications.requestPermissionsAsync();
    setNotificationPermissions(status);
    return status;
  };

  useEffect(() => {
    requestNotificationPermissions();
  }, []);

  useEffect(() => {
    if (notificationPermissions !== PermissionStatus.GRANTED) return;
    const listener = Notifications.addNotificationReceivedListener(handleNotification);
    return () => listener.remove();
  }, [notificationPermissions]);

  return (
    <View style={styles.container}>
      <Button onPress={() => scheduleNotification(1)} title="Notify" />
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
    paddingLeft: 10,
    paddingRight: 10,
  },
});

registerRootComponent(App);

export default App;

The expo-constants isDevice recently became deprecated. Make sure to now use the Device library from Expo.

expo install expo-device

import * as Device from 'expo-device';

And replace Constants.isDevice with Device.isDevice

Hi, i'm trying to use @whiteclouds7 example but for some reason the notifications don't show when the app is in the background on a physical device, they do work properly on Xcode iphone Simulator, any clues on why this may be?

I have this exact same issue, the notifications register just fine on a non APK/bundle but the moment I bundle the app.. the scheduleNotificationsAsync function just don't set the notification.