To call the Data Layer API, use the
Wearable
class to get instances of the various client classes,
such as
DataClient
and
MessageClient
.
Refer to the following related resources:
Note: A Wear app can communicate with a phone app using the Data Layer API, but connecting to a network using this API is discouraged. This API is currently only available on Android phones and Wear OS watches that are paired with Android phones.
Use a minimal client
A minimal client, as shown in the following example, is enough to begin. See Accessing Google Play services APIs for additional information:
Kotlin
val dataClient: DataClient = Wearable.getDataClient(context)
Java
DataClient dataClient = Wearable.getDataClient(context);
The context can be any valid Android context. If you are using the API
within the scope of an Activity, use the
getDataClient(activity)
method of the
Wearable
class, which allows certain interactions to appear
as dialogs rather than as notifications, e.g., if the user is asked to
update their version of Google Play services.
By default, callbacks to listeners are made on the app's main UI thread.
To have callbacks made on a different thread, use a
WearableOptions
object to specify a custom Looper
(see
WearableOptions.Builder
):
Kotlin
val dataClient: DataClient = Wearable.WearableOptions.Builder().setLooper(myLooper).build().let { options -> Wearable.getDataClient(context, options) }
Java
WearableOptions options = new WearableOptions.Builder().setLooper(myLooper).build(); DataClient dataClient = Wearable.getDataClient(context, options);
Wearable API clients, such as
DataClient
and
MessageClient
, are inexpensive to create and don't need to be
created only once and held onto. Use the style that suits your app. The client
state, such as the set of registered listeners, is shared across all clients,
and is preserved if Google Play services is updated while an app is
running.