docs/html/training/wearables/data-layer/accessing.jd


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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 mGoogleAppiClient = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(new ConnectionCallbacks() {
                &#64;Override
                public void onConnected(Bundle connectionHint) {
                    Log.d(TAG, "onConnected: " + connectionHint);
                }
                &#64;Override
                public void onConnectionSuspended(int cause) {
                    Log.d(TAG, "onConnectionSuspended: " + cause);
                }
        })
        .addOnConnectionFailedListener(new OnConnectionFailedListener() {
                &#64;Override
                public void onConnectionFailed(ConnectionResult result) {
                    Log.d(TAG, "onConnectionFailed: " + result);
                }
            })
        .addApi(Wearable.API)
        .build();
</pre>