flutter_alarm_notification

A flutter plugin that takes advantage of AlarmManagers, BroadcastReceivers to bring these features to your flutter app:

• Set repeating alarms at an exact or inexact time.
• Control alarm intervals.
• Cancel all registered alarms.
• Triggers a high-priority notification with an alarm ringtone.

Notification actions can be set up, and code can be run from the flutter side of the application to handle these events.

Here's a screen record of [FlutterAlarmNotification] in action.

You can find the sample example in /example/lib folder.

Getting Started

To get started do the following:

1. Add the package to pubspec.yaml file.
2. In the main() function, initialise the plugin.

   void main() async {
       /// Make sure to add this line of code
       WidgetsFlutterBinding.ensureInitialized();
   
       /// This line of code initializes the [FlutterAlarmNotification]
       FlutterAlarmNotification.initialize();
   
       runApp(const MyApp());
   }

Setting alarm

To register an alarm, use the FlutterAlarmNotification.registerRepeatingAlarm() passing in alarmConfig and notificationBuilder.

Parameter alarmConfig

The parameter alarmConfig is of type AlarmConfig and is responsible for configuring everything related to registering an alarm.

Below is the constructor for the AlarmConfig class.

AlarmConfig(
    /// Sets the interval of the alarm, can be either of the following:
    /// intervalDay, intervalHalfDay, intervalFifteenMinutes, intervalHalfHour,  intervalHour,
    interval: AlarmInterval.intervalFifteenMinutes,

    /// The hour to set the alarm for
    alarmHour: alarmTime!.hour,

    /// The minute to set the alarm for
    alarmMinute: alarmTime!.minute,

    /// The second to set the alarm for
    alarmSecond: 0,

    /// Set the type of the alarm, read on to know the options
    alarmType: AlarmType.rtcWakeup,

    /// A unique id has to be passed, note you will need this Id to cancel an existing alarm
    requestId: _alarmRequestId,

    /// Set [useExact] to true, for precise alarm, set to [false] if the alarm isn't meant to be precise.
    useExact: true,
)

The [AlarmType] is an enum with these options:

• Alarmtype.elaspedRealtime: Triggers the alarm based on how much time has passed since the device was booted. It does not wake up the device is asleep.

  For example, setting alarmMinute to 20 will trigger the alarm 20 minutes after the device is booted.

• Alarmtype.elaspedRealtimeWakeup : Is the same as Alarmtype.elaspedRealtime, the difference is that setting this wakes up the device is asleep.

• Alarmtype.rtc : Triggers the alarm according to the time of the clock. It does not wake the device up if asleep.

  For example, setting alarmHour to 12, will trigger the alarm by 12pm.

• Alarmtype.elaspedRealtime : Is the same as Alarmtype.rtc, the difference is that it wakes the device is asleep.

Parameter notificationBuilder

The parameter notificationBuilder is of type NotificationBuilder, it configures what is displayed when the notification is shown.

Here's the constructor:

NotificationBuilder(
    notificationTitle: "An example notification",
    notificationDescription:
        "This is the notification description",
    actions: [
        NotificationAction(
            actionText: "Okay",
            data: {"positive": 'go'},
        ),
        NotificationAction(
            actionText: "Cancel",
            data: {"negative": 'go'},
            launchAppOnTap: false,
        ),
    ],
)

To set notification actions, pass a list of NotificationAction setting the following parameters:

• actionText : The action displayed on the button.
• data Pass any extra data needed to handle that notification action.
• launchAppOnTap : If tapping on this action should launch the application, set this to true; else set to false.

Handling notification action

There are two ways of handling notification actions.

1. Pass a callback function during initialization, like this.

   FlutterAlarmNotification.initialize(
       actionCallback: (message) {
           ///TODO: Write code to handle notification action 
       },
   );

2. Listening to the notification actions Stream, by calling FlutterAlarmNotification.listenable.

   void _listenToAction() async {
       /// Gets the stream
       final stream = FlutterAlarmNotification.listenable;
   
       stream.listen((message) {
           /// Push new screen based on notification action
           _pushNewScreen(message);
       });
   
       /// If there was a pending event before [HomeScreen] was created, handle it
       final cachedMessage = await FlutterAlarmNotification.cachedMessage;
   
       if (cachedMessage != null) {
           _pushNewScreen(cachedMessage);
       }
   }
   
   void _pushNewScreen(message) {
       Navigator.push(
           context,
           MaterialPageRoute(
               builder: (c) => SecondScreen(
                data: message.toString(),
               ),
           ),
       );
   }

   The method _listenToAction() can be called in the initState() of a StatefulWidget to handle events.

This plugin is still in its early stages, as such is missing some implementations. Feel free to contribute to this project.

Checklist

• Implement repeating alarms for android.
• Run flutter code when notification is interacted with.
• Write unit test cases.
• Implement one-shot alarms for android.
• Flexibility in setting alarm ringtone.
• Implement these features in IOS.