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Android Wear Docs, Release 1.1

5.3 Handheld Activation

A great way to start your wearable app is from a notiﬁcation on the wearable. This is useful when you already have a

handheld app and want to extend features to a wearable. The handheld app starts the launch process by sending a data

object to the wearable that contains the information the wearable needs to post a notiﬁcation locally. Users swipe this

notiﬁcation and tap the Open icon to launch the wearable portion of your app. They return to the notiﬁcation stream

when the wearable app closes.

Often times you want to launch the wearable app with extra data that tells it what feature to open or what data to

display. For example, a general handheld golf app might open the wearable for a speciﬁc golf course. This section

includes details about adding such data to the launch process. Without this, the wearable app simply launches in its

default mode.

5.3.1 Prerequisite

This procedure relies on communication through the data layer. Communication through the data layer requires setup

of Google Play Services for wearables in both the handheld and wearable devices (see Data Layer DataMap Objects).

5.3.2 Post a Notiﬁcation

1. First create a DataMap object that includes the title and body for the notiﬁcation. Optionally, include any extra

data that you want to pass to your wearable app when it starts. Then send this DataMap object to the wearable

data layer, along with a path constant that identiﬁes the purpose of the data. The SendToDataLayerThread class

in this example is deﬁned in Data Layer DataMap Objects.

String WEARABLE_START_PATH = "/wearable_start";

// Create a DataMap

DataMap notifyWearable = new DataMap();

notifyWearable.putString("title", "Notification Title");

notifyWearable.putString("body", "Start now?");

// Optional extra data to use when starting wearable

notifyWearable.putString("extra", "extra data")

// Send to data layer

new SendToDataLayerThread(WEARABLE_START_PATH, notifyWearable).start();

2. In the wearable, receive the DataMap in a WearableListenerService class. The following excerpt shows a sample

override for the onDataChanged method of the service.

@Override

public void onDataChanged(DataEventBuffer dataEvents) {

DataMap dataMap;

22 Chapter 5. Wearable Application Launch

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