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page.title=Accessing the Wearable Data Layer
@jd:body
<div id="tb-wrapper">
<div id="tb">
<h2>This lesson teaches you to</h2>
<ol>
<li>Set up a Google Play services client to use the Wearable Data Layer APIs</li>
</ol>
<h2>Dependencies and Prerequisites</h2>
<ol>
<li><a href="{@docRoot}training/wearables/apps/environment.html">Creating
Wearable Apps > Setting up Your Environment</a></li>
<li><a href="{@docRoot}training/wearables/apps/creating.html">Creating
Wearable Apps > Creating a Project</a></li>
</ol>
</div>
</div>
<p>To call the data layer API, create an instance of
<a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html"><code>GoogleApiClient</code></a>,
the main entry point for any of the Google Play services APIs.
</p>
<p>
<a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html"><code>GoogleApiClient</code></a>
provides a builder that makes it easy to create an instance of the client.
A minimal <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html"><code>GoogleApiClient</code></a> looks like this:
</p>
<p class="note"><b>Note:</b> For now, this minimal client is enough to get started. However, see
<a href="{@docRoot}google/auth/api-client.html">Accessing Google Play services APIs</a>
for more information about creating a <a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html"><code>GoogleApiClient</code></a>,
implementing its callbacks, and handling error cases.</p>
<pre style="clear:right">
GoogleApiClient mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(new ConnectionCallbacks() {
@Override
public void onConnected(Bundle connectionHint) {
Log.d(TAG, "onConnected: " + connectionHint);
// Now you can use the data layer API
}
@Override
public void onConnectionSuspended(int cause) {
Log.d(TAG, "onConnectionSuspended: " + cause);
}
})
.addOnConnectionFailedListener(new OnConnectionFailedListener() {
@Override
public void onConnectionFailed(ConnectionResult result) {
Log.d(TAG, "onConnectionFailed: " + result);
}
})
// Request access only to the Wearable API
.addApi(Wearable.API)
.build();
</pre>
<p class="caution">
<strong>Important:</strong> To avoid client connection errors on devices that do not have the
<a href="https://play.google.com/store/apps/details?id=com.google.android.wearable.app&hl=en">Android
Wear app</a> installed, use a separate <a
href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html">{@code
GoogleApiClient}</a> instance to access only the <a
href="{@docRoot}reference/com/google/android/gms/wearable/Wearable.html">{@code
Wearable}</a> API. For more information, see <a
href="{@docRoot}google/auth/api-client.html#WearableApi">Access the Wearable API</a>.</p>
<p>Before you use the data layer API, start a connection on your client by calling the
<a href="{@docRoot}reference/com/google/android/gms/common/api/GoogleApiClient.html#connect()">connect()</a>
method, as described in
<a href="{@docRoot}google/auth/api-client.html#Starting">Accessing Google Play services APIs</a>.
When the system invokes the <code>onConnected()</code> callback for your client, you're ready
to use the data layer API.</p>
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