Flutter Alarm Manager Schedule Task with Alaram
Last updated Dec 27, 2021
In this Flutter example tutorial we will cover how to create Alarm in flutter and schedule a task with Alarm Manager. Alarm Manager acts as a link between the application and the Android system alarm service. It can send a broadcast to your app (which the user can entirely discontinue) at a certain time, and your app can then conduct any task as a result. The system can postpone any alarm in order to improve device performance.
In this example to use alarm we are using Android Alaram Manager plugin.
Let's get Started
Step 1: Create Flutter application
Step 2: Add required dependencies in pubspec.yaml file
dependencies:
flutter:
sdk: flutter
android_alarm_manager: ^2.0.2
flutter_local_notifications: ^9.1.5
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Step 3: Import package
import 'package:android_alarm_manager/android_alarm_manager.dart';
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Step 4: AndroidAlarmManager has 3 types of events to execute task
AndroidAlarmManager.oneShot():
This Schedules a one-shot timer to run `callback` at `time. The `callback` will run whether or not the main application is running or in the foreground
Below code will gives the example to how to work with Alarm Manager
import 'package:android_alarm_manager/android_alarm_manager.dart';
int alarmId = 1;
// ignore: unused_element
void _examples() {
// runs alarm timer once with time delay
AndroidAlarmManager.oneShot(
Duration(seconds: 5),
alarmId,
fireAlarm,
); // runs alarm timer at exact time
AndroidAlarmManager.oneShotAt(
// date time format (year,month,date,hour,minutes,seconds)
DateTime(2021, 02, 18, 14, 10),
alarmId,
fireAlarm,
);
// runs callback function repeatedly
AndroidAlarmManager.periodic(
// must be higher than 60 seconds
Duration(seconds: 60),
alarmId,
fireAlarm,
);
}
void fireAlarm() {
print('Alarm Fired at${DateTime.now()}');
}
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If we want to run in android we should update manifest file with below permissions and receiver component inside application tag
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>
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<service
android:name="dev.fluttercommunity.plus.androidalarmmanager.AlarmService"
android:permission="android.permission.BIND_JOB_SERVICE"
android:exported="false"/>
<receiver
android:name="dev.fluttercommunity.plus.androidalarmmanager.AlarmBroadcastReceiver"
android:exported="false"/>
<receiver
android:name="dev.fluttercommunity.plus.androidalarmmanager.RebootBroadcastReceiver"
android:enabled="false">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED"></action>
</intent-filter>
</receiver>
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We should initialize Alarm Manager with below code
await AndroidAlarmManager.initialize();
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Complete Flutter code to Schedule Task with Alarm Manager
import 'package:android_alarm_manager/android_alarm_manager.dart';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
class HomePage extends StatefulWidget {
@override
_HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
bool isOn = false;
int alarmId = 1;
@override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Transform.scale(
scale: 2,
child: Switch(
value: isOn,
onChanged: (value) {
setState(() {
isOn = value;
});
if (isOn == true) {
AndroidAlarmManager.oneShot(
Duration(seconds: 6), alarmId, fireAlarm);
} else {
AndroidAlarmManager.cancel(alarmId);
print('Alarm Timer Canceled');
}
},
),
),
),
);
}
}
void fireAlarm() {
print('Alarm Fired at ssadasd ${DateTime.now()}');
setNotification();
}
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This above code will execute a task after 6 seconds. And we can also set the Local Notification on particular time with Local Notification plugin
void setNotification() async {
print('Alaram Tiggered trigger notification set');
//Read some more stuff from sharedpreference and/or firebase. Use that information for the notification text.
FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin = new FlutterLocalNotificationsPlugin();
var initializationSettingsAndroid =
new AndroidInitializationSettings('mipmap/ic_launcher');
var initializationSettingsIOS = new IOSInitializationSettings(
onDidReceiveLocalNotification: (i, string1, string2, string3) {
print("received notifications");
});
var initializationSettings = new InitializationSettings(
android: initializationSettingsAndroid, iOS:initializationSettingsIOS);
flutterLocalNotificationsPlugin.initialize(initializationSettings,
onSelectNotification: (string) {
print("selected notification");
});
var androidPlatformChannelSpecifics = AndroidNotificationDetails(
'12', 'eqweqw',
importance: Importance.max, priority: Priority.high);
var iOSPlatformChannelSpecifics = IOSNotificationDetails();
var platformChannelSpecifics = NotificationDetails(
android: androidPlatformChannelSpecifics, iOS:iOSPlatformChannelSpecifics);
await flutterLocalNotificationsPlugin.show(1, 'Zugdfda',
'Android & Flutter Tutorialsfsd', platformChannelSpecifics,
payload: 'item x');
}
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main.dart file
import 'package:android_alarm_manager/android_alarm_manager.dart';
import 'package:flutter/material.dart';
import 'package:flutter_alaram_manager/home_page.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';
import 'package:intl/intl.dart';
import 'dart:isolate';
import 'dart:math';
import 'dart:ui';
void main() async {
await AndroidAlarmManager.initialize();
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: 'Flutter Alarm Manager',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: HomePage(),
);
}
}
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