🏆 Winner of the 2023 OnePub Community Choice Awards.

Alarm plugin for iOS and Android

This Flutter plugin provides a simple and easy-to-use interface for setting and canceling alarms on iOS and Android devices. It utilizes the android_alarm_manager_plus plugin for Android and the native iOS AVAudioPlayer class.

🔧 Installation steps

Please carefully follow these installation steps. They have been updated for plugin version 2.0.0.

iOS Setup

Android Setup

📖 How to use

Add to your pubspec.yaml:

flutter pub add alarm

First, you have to initialize the Alarm service in your main function:

await Alarm.init()

Then, you have to define your alarm settings:

final alarmSettings = AlarmSettings(
  id: 42,
  dateTime: dateTime,
  assetAudioPath: 'assets/alarm.mp3',
  loopAudio: true,
  vibrate: true,
  volumeMax: true,
  fadeDuration: 3.0,
  notificationTitle: 'This is the title',
  notificationBody: 'This is the body',
  enableNotificationOnKill: true,
);

And finally set the alarm:

await Alarm.set(alarmSettings: alarmSettings)

Property	Type	Description
id	int	Unique identifier of the alarm.
alarmDateTime	DateTime	The date and time you want your alarm to ring.
assetAudio	String	The path to you audio asset you want to use as ringtone. Can be a path in your assets folder or a downloaded local file path.
loopAudio	bool	If true, audio will repeat indefinitely until alarm is stopped.
vibrate	bool	If true, device will vibrate indefinitely until alarm is stopped. If loopAudio is set to false, vibrations will stop when audio ends.
volumeMax	bool	If true, set system volume to maximum when dateTime is reached. Set back to previous volume when alarm is stopped.
fadeDuration	double	Duration, in seconds, over which to fade the alarm volume. Set to 0 by default, which means no fade.
notificationTitle	String	The title of the notification triggered when alarm rings if app is on background.
notificationBody	String	The body of the notification.
enableNotificationOnKill	bool	Whether to show a notification when application is killed to warn the user that the alarm he set may not ring. Enabled by default.
stopOnNotificationOpen	bool	Whether to stop the alarm when opening the received notification. Disabled by default.
androidFullScreenIntent	bool	Whether to turn screen on when android alarm notification is triggered. Enabled by default.

The notification shown on alarm ring can be disabled simply by ignoring the parameters notificationTitle and notificationBody. However, if you want a notification to be triggered, you will have to provide both of them.

If you enabled enableNotificationOnKill, you can chose your own notification title and body by using this method before setting your alarms:

await Alarm.setNotificationOnAppKillContent(title, body)

This is how to stop/cancel your alarm:

await Alarm.stop(id)

This is how to run some code when alarm starts ringing. We implemented it as a stream so even if your app was previously killed, your custom callback can still be triggered.

Alarm.ringStream.stream.listen((_) => yourOnRingCallback());

To avoid unexpected behaviors, if you set an alarm for the same time as an existing one, the new alarm will replace the existing one.

📱 Example app

Don't hesitate to check out the example's code, and take a look at the app:

⏰ Alarm behaviour

	Sound	Vibrate	Volume max	Notification
Locked screen	✅	✅	✅	✅
Silent / Mute	✅	✅	✅	✅
Do not disturb	✅	✅	✅	Silenced
Sleep mode	✅	✅	✅	Silenced
While playing other media	✅	✅	✅	✅
App killed	❌	❌	❌	✅

Silenced: Means that the notification is not shown directly on the top of the screen. You have to go in your notification center to see it.

❓ FAQ

Why didn't my alarm fire on iOS?

Several factors could prevent your alarm from ringing:

• Your iPhone was restarted (either from a manual reboot or due to an iOS update).
• The app was either manually terminated or was closed because of memory constraints.

My alarm is not firing on a specific Android device

Some Android manufacturers prefer battery life over proper functionality of your apps. Check out dontkillmyapp.com to find out about more about optimizations done by different vendors, and potential workarounds. Most common solution is to educate users to disable battery optimization settings. Source: android_alarm_manager_plus FAQ

How can I increase the reliability of the alarm ringing?

The more time the app spends in the background, the higher the chance the OS might stop it from running due to memory or battery optimizations. Here's how you can optimize:

• Regular App Usage: Encourage users to open the app at least once a day.
• Leverage Background Modes: Engage in activities like weather API calls that keep the app active in the background.
• User Settings: Educate users to refrain from using 'Do Not Disturb' (DnD) and 'Low Power Mode' when they're expecting the alarm to ring.

⚙️ Under the hood

Android

Uses oneShotAt from the android_alarm_manager_plus plugin with a two-way communication isolated callback to start/stop the alarm.

iOS

Keeps the app awake using a silent AVAudioPlayer until alarm rings. When in the background, it also uses Background App Refresh to periodically ensure the app is still active.

✉️ Feature request

If you have a feature request, just open an issue explaining clearly what you want and if you convince me I will develop it for you.

💙 Contributing

We welcome contributions to this plugin! If you would like to make a change or add a new feature, please follow these steps:

1. Fork the repository and create a new branch for your changes.
2. Make your changes
3. Run flutter format to ensure that your code is correctly formatted.
4. Submit a pull request with a detailed description of your changes.

These are some features that I have in mind that could be useful:

• Use ffigen and jnigen binding generators to call native code more efficiently instead of using method channels.
• Notification actions: stop and snooze.
• Stop alarm sound when notification is dismissed.
• Make alarm ring even if app was terminated.

Thank you for considering contributing to this plugin. Your help is greatly appreciated!

❤️ Let me know if you like the plugin by liking it on pub.dev and starring the repo on Github 🙂