Notifications on watches use the same APIs and have the same structure as notifications on phones.
Notifications can appear on a watch in two ways:
- A mobile app creates a notification and the system automatically bridges that notification to the watch.
- A wearable app creates a notification.
For both scenarios, developers use the
class to create notifications. When you build notifications with the builder class, the system
takes care of displaying notifications properly.
For example, when you issue a notification from your mobile app, each notification appears as a card on the Notification Stream.
Use one of the
subclasses for the best results.
are stripped of custom layouts and the wearable only displays the text and icons. However, you can
create custom notifications that use
custom card layouts that
work well on the watch.
Recommended notifications for wearables
We recommend using expandable notifications as the starting point for all notifications, as they are a great way to engage wearable users. The collapsed state is shown in the notification tray for a short, glanceable experience. If the user taps on it, the notification expands, revealing an immersive, scrollable experience of additional content and actions.
You can Create an expandable notification
the same way you would on mobile with any of the
For example, a standard notification using
looks like this:
You can see the notification has multiple Actions stacked at the bottom of the expanded state.
Tip: If your notifications include a "Reply" action (such as for a messaging
app), you can enhance the behavior of the notification. For example, enable voice input replies
directly from the wearable or pre-defined text responses with
For more information, read
Add the reply button.
Avoiding duplicate Notifications
By default, notifications are bridged from a companion phone app to any paired watches. This is a great option if you don't have a wearable app installed.
However, if you build a standalone watch app and you have a companion phone app, the apps will create duplicate notifications.
Wear OS provides a way to stop duplicate notifications with the Bridging APIs. For more information, read Bridging mode for notifications on Wear.
Add wearable specific-features to a notification
If you ever need to add wearable-specific features to a notification, such as hiding
an app icon from the wearable notification or letting users dictate a text response
with voice input, you can use the
NotificationCompat.WearableExtender class to specify the options.
To use this API, do the following:
Create an instance of a
WearableExtender, setting the wearable-specific options for the notification.
Create an instance of
NotificationCompat.Builder, setting the desired properties for your notification as described earlier in this lesson.
extend()on the notification and pass in the
WearableExtender. This applies the wearable options to the notification.
build()to build the notification.
You can sync dismissals (cancellations) of notifications across the user's devices. To
sync a dismissal
setDismissalId() method. For each notification, pass a globally unique
ID, as a string, when you call the
setDismissalId() method. When the notification is dismissed, all other
notifications with the same dismissal ID are dismissed on the watch(es) and on the
companion phone. To retrieve a dismissal ID, use
Specify wearable-only actions
If you want different actions available on the watch and the phone, then use
WearableExtender.addAction(). Once you add an action with this method,
the wearable does not display any other actions added with
NotificationCompat.Builder.addAction(). The actions added with
WearableExtender.addAction() appear only on the wearable and they do not
appear on the phone.