How To Create Notification Channel In Android

Channels & Groups

Android Channels are a core concept of the notification system for Android. Learn how they impact you and your users.

Understanding Channels

Starting in Android 8.0 (API level 26), all notifications must be assigned to a channel. Applications can create one or more notification channels. Each channel can be customised with its own unique visual & auditory behaviour. Once a channel has been created with initial settings, the user then has full control in changing those settings and can also decide how intrusive notifications from your application can be.

The screenshots below show the notification settings for the Android "Clock" app. The screenshot on the left shows listing channels as "categories". The screenshot on the right shows the further options available once you click on a category, in this instance, the "Firing alarms & timers" category.

Channel Groups

Channel Groups are available if you'd further like to organize the appearance of your channels in the settings UI. Creating channel groups is a good idea when your application has many channels, or for example supports multiple accounts (such as work profiles). Groups allow users to easily identify and control multiple notification channels.

The below screenshot shows an application's settings which contains two groups ("Personal" and "Work"), each with a notification channel assigned.

User Control

When a notification channel is first created, a number of settings can be applied by the application which instruct incoming notifications how to behave when a notification belonging to that channel is created.

It is important to remember channels are designed to give users' control over your notifications. Users are able to override notification behavior. The user can alter notification behavior for the entire app or for each channel.

Managing Channels & Groups

Using Notifee, your application can create, update and delete notification channels and groups. The API has been designed to work seamlessly between devices with and without notification channel support.

Creating & updating channels

Channels can be both created and updated using the same process. If a channel does not exist on the application it will be created, and if it already exists it will be updated. When developing an application, it is safe to always assume a channel does not exist and attempt to create it each time the application boots.

To create a new channel, call the createChannel method. The only required fields are the unique id and a name, if other values are omitted the channel will be created with sensible defaults, for example:

                      import            notifee,            {            AndroidImportance            }            from            '@notifee/react-native'            ;            await            notifee.            createChannel            (            {            id:            'alarm'            ,            name:            'Firing alarms & timers'            ,            lights:            false            ,            vibration:            true            ,            importance:            AndroidImportance            .            DEFAULT            ,            }            )            ;

On devices which do not support channels (API Level < 26), this method will successfully resolve gracefully. No channel will be created or be visible in the application settings UI.

See the AndroidChannel reference API for descriptions and usage of all of the available properties which can be applied to a channel.

Deleting channels

To delete a channel from the application, call the deleteChannel method with the channel ID you wish to delete:

                      await            notifee.            deleteChannel            (            'alarm'            )            ;

Be careful when deleting existing channels, any newly created notifications assigned to the deleted channel will no longer display.

Creating & updating groups

Similar to creating channels, a notification group can be created and updated using the createChannelGroup method. The method accepts a unique identifier and name. Once created, a channel can be assigned to the group by updating the groupId property on the channel.

                      // Create a group            await            notifee.            createChannelGroup            (            {            id:            'personal'            ,            name:            'Personal'            ,            }            )            ;            // Assign the group to the channel            await            notifee.            createChannel            (            {            id:            'comments'            ,            name:            'New Comments'            ,            groupId:            'personal'            ,            }            )            ;

See the AndroidChannelGroup reference API for descriptions and usage of all of the available properties which can be applied to a group.

Deleting groups

To delete a channel group, call the deleteChannelGroup method with the channel group ID you wish to delete:

                      await            notifee.            deleteChannelGroup            (            'personal'            )            ;

Deleting a group does not delete channels which are assigned to the group, they will instead be unassigned from the group and continue to function as expected.

Listening to channel events

Notifee provides a handy event listener to subscribe to all incoming notification and device events.

In some applications, you may want to know when a user disables a notification channel, or the entire application. For example, you could save received notifications locally when the channel it belongs to is disabled, and show an in-app "unread" notification count to the user when they open the application.

Notifee provides 3 event types for channel events:

Event Type
APP_BLOCKED	Triggered when the user has toggled to block/unblock all notifications for the application.
CHANNEL_BLOCKED	Triggered when the user has toggled to block/unblock notifications of a specific channel.
CHANNEL_GROUP_BLOCKED	Triggered when the user has toggled to block/unblock notifications of a channel group.

Each event type contains a payload with information specific to that event, such as whether channel/app has been blocked, unblocked and the channel data itself. For example:

                      import            notifee,            {            EventType            }            from            '@notifee/react-native'            ;            notifee.            onForegroundEvent            (            (                          {              type,              detail              }                        )            =>            {            if            (type            ===            EventType            .            APP_BLOCKED            )            {            console            .            log            (            'User toggled app blocked'            ,            detail.            blocked            )            ;            }            if            (type            ===            EventType            .            CHANNEL_BLOCKED            )            {            console            .            log            (            'User toggled channel block'            ,            detail.            channel            .            id            ,            detail.            blocked            )            ;            }            if            (type            ===            EventType            .            CHANNEL_GROUP_BLOCKED            )            {            console            .            log            (            'User toggled channel group block'            ,            detail.            channelGroup            .            id            ,            detail.            blocked            )            ;            }            }            )            ;

These events can also trigger when the user enters the notification settings for the first time, allowing you to view the user's settings before they toggle the blocked state.

To learn more about handling events in your application, view the events documentation.

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