Hello everyone, Today I'll show you how we can implement local push notification in a flutter app.
Implementation
We will use a package called flutter_local_notifications .
Add the following to your pubspec.yaml
file:
dependencies:
....
flutter_local_notifications: ^5.0.0+1
Check for the latest version in the package link.
Add the following to your AndroidManifest.xml
file:
<uses-permission
android:name="android.permission.VIBRATE" />
<uses-permission
android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
Taking permission to schedule notification and for vibration.
Local Notification Helper
Create a file named as LocalNotificationHelper.dart
.
You can give any name to the file. I prefer the filenames to be specific with their functionality.
Will do everything inside a class named LocalNotificationHelper
and don't forget to import our flutter_local_notifications
plugin.
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
class LocalNotificationHelper {
final FlutterLocalNotificationsPlugin _flutterLocalNotificationsPlugin =
FlutterLocalNotificationsPlugin();
static LocalNotificationHelper _localNotification;
LocalNotification._createInstance();
factory LocalNotificationHelper() {
if (_localNotification == null) {
_localNotification = LocalNotificationHelper._createInstance();
_localNotification._initialize();
}
return _localNotification;
}
}
First we are creating the instance of
FlutterLocalNotificationsPlugin
.
Then creating the instance of our classLocalNotificationHelper
with a singleton pattern .
Now we will implement onSelectNotification
and onDidReceiveLocalNotification
method that will get invoked on pressing the notification on Android
and iOS
respectively.
....
class LocalNotificationHelper {
....
Future _onSelectNotification(String payload) async {
// Implement your own logic
}
Future _onDidReceiveLocalNotification(
int id, String title, String body, String payload) async {
// Implement your own logic
}
}
Sometimes we want to decouple these helper files from our UI and functionality, in that case, you can set these onSelectNotification
and onDidReceiveLocalNotification
methods from outside by passing them as an argument to another method of this helper class like this:
....
class LocalNotificationHelper {
....
var _onSelectNotification, _onDidReceiveLocalNotification;
void init(onSelectNotification, onDidReceiveLocalNotification) {
if (this._onSelectNotification == null) {
this._onSelectNotification = onSelectNotification;
}
if (this._onDidReceiveLocalNotification == null) {
this._onDidReceiveLocalNotification= onDidReceiveLocalNotification;
}
}
}
Now we can call this
init
method from ourmain.dart
orHomepage
. Don't forget to pass the methods.
We will now initialize our notification settings.
Let's create a _initialize
method inside our class.
....
class LocalNotificationHelper {
....
Future<void> _initialize() async {
AndroidInitializationSettings initializationSettingsAndroid =
AndroidInitializationSettings('@drawable/ic_notification');
IOSInitializationSettings initializationSettingsIOS =
IOSInitializationSettings(
onDidReceiveLocalNotification: _onDidReceiveLocalNotification);
InitializationSettings initializationSettings = InitializationSettings(
android: initializationSettingsAndroid, iOS: initializationSettingsIOS);
await _flutterLocalNotificationsPlugin.initialize(initializationSettings,
onSelectNotification: _onSelectNotification);
}
}
AndroidInitializationSettings
and IOSInitializationSettings
are initializing the settings for Android
and iOS
platform respectively.
We can also pass the path of the default notification icon in AndroidInitializationSettings
.
Showing Notification
Let's create a showNotification
method, which will pop a notification. You can call this method from anywhere to create a push notification.
....
class LocalNotificationHelper {
....
Future<void> showNotification() async {
const AndroidNotificationDetails androidPlatformChannelSpecifics =
AndroidNotificationDetails(
'channel id',
'channel name',
'channel description',
importance: Importance.max,
priority: Priority.high,
icon: '@drawable/ic_notification',
);
const IOSNotificationDetails iOSPlatformChannelSpecifics =
IOSNotificationDetails();
const NotificationDetails platformChannelSpecifics = NotificationDetails(
android: androidPlatformChannelSpecifics,
iOS: iOSPlatformChannelSpecifics);
await _flutterLocalNotificationsPlugin.show(
0, 'Notification Title', 'Notification Body', platformChannelSpecifics,
payload: 'Notification Payload');
}
}
AndroidNotificationDetails
is responsible for configuring the notification for a specific channel in android devices. If you go to the notification section inside the app info of your app, you will see this channel name
there. Also, we can set priority, vibration, importance etc.
show
method is responsible for creating the push notification. It expects some arguments like id, title, body, payload
.
title
andbody
will be visible in the actual notification popup andpayload
will be available ononSelectNotification
method.
Schedule Notification
Let's create a scheduleNotification
method, which will schedule the notification to pop at a specific time. You can call this method from anywhere to schedule a push notification.
....
class LocalNotificationHelper {
....
Future<void> scheduleNotification() async {
const AndroidNotificationDetails androidPlatformChannelSpecifics =
AndroidNotificationDetails(
'channelId',
'channelName',
'channelDescription',
importance: Importance.max,
priority: Priority.high,
icon: '@drawable/ic_notification',
);
const IOSNotificationDetails iOSPlatformChannelSpecifics =
IOSNotificationDetails();
const NotificationDetails platformChannelSpecifics = NotificationDetails(
android: androidPlatformChannelSpecifics,
iOS: iOSPlatformChannelSpecifics);
await _flutterLocalNotificationsPlugin.schedule(
0, 'Notification Title', 'Notification Body', DateTime.now(), platformChannelSpecifics,
payload: 'Notification Payload');
}
}
schedule
method is similar to theshow
method with just one additional positional argument that is the time at which you want to push that notification to the user.
Cancel Notification
Let's create a cancelNotification
method, which will cancel the scheduled notification.
....
class LocalNotificationHelper {
....
Future<void> cancelNotification() async {
await _flutterLocalNotificationsPlugin.cancel(0);
}
}
cancel
method expects theid
of the notification as an argument.
Cancel All Notification
Let's create a cancelAllNotification
method, which will cancel all the scheduled notifications.
....
class LocalNotificationHelper {
....
Future<void> cancelAllNotification() async {
await _flutterLocalNotificationsPlugin.cancelAll();
}
}
Repetitive Notification
Let's create a repeatNotification
method, which will push the notification at an interval of time.
....
class LocalNotificationHelper {
....
Future<void> repeatNotification() async {
const AndroidNotificationDetails androidPlatformChannelSpecifics =
AndroidNotificationDetails(
'channelId',
'channelName',
'channelDescription',
importance: Importance.max,
priority: Priority.high,
icon: '@drawable/ic_notification',
);
const IOSNotificationDetails iOSPlatformChannelSpecifics =
IOSNotificationDetails();
const NotificationDetails platformChannelSpecifics = NotificationDetails(
android: androidPlatformChannelSpecifics,
iOS: iOSPlatformChannelSpecifics);
await _flutterLocalNotificationsPlugin.periodicallyShow(
0, 'Notification Title', 'Notification Body', RepeatInterval.daily, platformChannelSpecifics,
payload: 'Notification Payload');
}
}
periodicallyShow
method is similar to theschedule
method but it takes a RepeatInterval type of argument.
Pending Notifications
Let's create a getPendingNotifications
method, which will retrieve all the pending notifications.
....
class LocalNotificationHelper {
....
Future<List<PendingNotificationRequest>> getPendingNotifications () async {
return await _flutterLocalNotificationsPlugin.pendingNotificationRequests();
}
}
We can do a lot more with the properties of notification like showing media, pictures etc.
I have personally used this local push notification in some of my apps and I must say it works perfectly well. Scheduled Notification is fast and reliable but there are some caveats, you can read it here.
Haven't tested with iOS device.
Thank you for reading. Give it a thumbs-up if it is helpful for you.
Feel free to connect 👋
Originally published on blog.bibekkakati.me
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