Notifications in Android can be grouped to display related notifications into a single pane in the notification's shade.

Grouping

Grouped notifications share a unique identifier, which can be provided to the groupId property. Before displaying notifications in a group, you must first create a "summary" notification which holds all future notifications with the same ID.

The summary notification can be created by setting the groupSummary property to true:

notifee.displayNotification({
  title: 'Emails',
  subtitle: '3 Unread Emails',
  android: {
    channelId,
    groupSummary: true,
    groupId: '123',
  },
});

Further notifications can be added to the group by providing the same groupId:

notifee.displayNotification({
  title: 'New Email',
  body: 'Tap to open your email.',
  subtitle: 'Unread',
  android: {
    channelId,
    groupId: '123',
  },
});

Group behaviour

By default, each grouped notification (including the summary notification) will alert the user as normal. This can be changed so only the summary notification alerts when displayed, or only the children alert. To change the default behaviour, the groupAlertBehavior property can be set.

Setting behaviour

To set specific behaviour, the alert behaviour type must be set on both the summary and children. For example, to only alert when the summary notification is displayed, pass AndroidGroupAlertBehavior.SUMMARY to the groupAlertBehavior property:

import notifee, { AndroidGroupAlertBehavior } from '@notifee/react-native';

// Create summary
notifee.displayNotification({
  title: 'Emails',
  subtitle: '3 Unread Emails',
  android: {
    channelId,
    groupSummary: true,
    groupId: '123',
    groupAlertBehavior: AndroidGroupAlertBehavior.SUMMARY,
  },
});

// Children
notifee.displayNotification({
  title: 'New Email',
  body: 'Tap to open your email.',
  subtitle: 'Unread',
  android: {
    channelId,
    groupId: '123',
    groupAlertBehavior: AndroidGroupAlertBehavior.SUMMARY,
  },
});

To alert when children are displayed, use AndroidGroupAlertBehavior.CHILDREN instead. View the AndroidGroupAlertBehavior documentation.

Sorting

Notifications are sorted (the order shown from top to bottom in the notification shade) in the order displayed by default. It is possible to manually sort notifications by a custom value or timestamp.

Sorting by timestamp

When providing a custom timestamp, the device will automatically sort the notifications (showing the newest at the top). To provide a timestamp, pass the number of milliseconds to the timestamp property on the notification options:

notifee.displayNotification({
  title: 'New message',
  body: 'New message from Sarah Lane',
  android: {
    channelId,
    timestamp: Date.now() - 300000, // 5 minutes ago
    showTimestamp: true,
  },
});

Sorting by key

If the timestamp isn't a valid value you wish to sort by, you can further provide a sortKey property to the notification options. When set the device will sort notifications in a lexicographical order:

notifee.displayNotification({
  title: 'New message',
  body: 'New message from Sarah Lane',
  android: {
    channelId,
    timestamp: Date.now() - 300000, // 5 minutes ago
    showTimestamp: true,
    sortKey: '1',
  },
});

notifee.displayNotification({
  title: 'New message',
  body: 'New message from John Doe',
  android: {
    channelId,
    timestamp: Date.now() - 480000, // 8 minutes ago
    showTimestamp: true,
    sortKey: '2',
  },
});

The sortKey overrides the timestamp as the sorting property when provided.