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Android Wear Docs, Release 1.1

name, which is essential for the wearable data layer to work.

Data layer messages can originate from either a handheld or wearable. For bidirectional messaging both the handheld

and wearable should implement a message sender and listener.

6.1.1 Implement a Message Sender

This section describes how to send messages to the data layer. The example code shown sends messages from the

handheld to the data layer.

Add Build Dependencies

Add the following build dependencies to the build.gradle ﬁle (Module:mobile) in the Gradle Scripts folder, if necessary.

dependencies {

compile fileTree(dir: ’libs’, include: [’

.jar’])

compile ’com.android.support:appcompat-v7:21.0.+’

compile ’com.google.android.gms:play-services:6.5.+’

}

Add Metadata for Google Play Services

Add Google Play services metadata statement to the manifest of the sending device:

...

android:value="@integer/google_play_services_version" />

</application>

Create the Message Sender

To send a message , update the code in the main Activity of the sending device. For the handheld, modify the code in

the mobile branch of the Android Studio project.

1. Build a Google Play Services client for the Wearable API.

public class MessageActivity extends Activity implements

GoogleApiClient.ConnectionCallbacks,

GoogleApiClient.OnConnectionFailedListener {

GoogleApiClient googleClient;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_handheld);

// Build a new GoogleApiClient for the Wearable API

googleClient = new GoogleApiClient.Builder(this)

.addApi(Wearable.API)

.addConnectionCallbacks(this)

.addOnConnectionFailedListener(this)

.build();

26 Chapter 6. Data Layer Messages

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