diff options
Diffstat (limited to 'docs/html/training/wearables/data-layer/index.jd')
| -rw-r--r-- | docs/html/training/wearables/data-layer/index.jd | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/docs/html/training/wearables/data-layer/index.jd b/docs/html/training/wearables/data-layer/index.jd index 85b2c33..df7c216 100644 --- a/docs/html/training/wearables/data-layer/index.jd +++ b/docs/html/training/wearables/data-layer/index.jd @@ -58,6 +58,30 @@ the data layer:</p> <a href="{@docRoot}reference/com/google/android/gms/wearable/WearableListenerService.html"><code>WearableListenerService</code></a> lets you listen for changes only when the user is actively using your app. </dd> + + <dt><b>Channel</b></dt> + <dd> + You can use the + <a href="{@docRoot}reference/com/google/android/gms/wearable/ChannelApi.html"><code>ChannelApi</code></a> + class to transfer large data items, such as music and movie files, from a handheld to a wearable + device. The Channel API for data transfer has the following benefits: + <ul> + <li>Transfer large data files between two or more connected devices, without + the automatic synchronization provided when using + <a href="{@docRoot}reference/com/google/android/gms/wearable/Asset.html"><code>Asset</code></a> + objects attached to + <a href="{@docRoot}reference/com/google/android/gms/wearable/DataItem.html"><code>DataItem</code></a> + objects. The Channel API saves disk space unlike the + <a href="{@docRoot}reference/com/google/android/gms/wearable/DataApi.html"><code>DataApi</code></a> + class, which creates a copy of the assets on the local device before synchronizing with + connected devices.</li> + <li>Reliably send a file that is too large in size to send using the + <a href="{@docRoot}reference/com/google/android/gms/wearable/MessageApi.html"><code>MessageApi</code></a> + class.</li> + <li>Transfer streamed data, such as music pulled from a network server or voice + data from the microphone.</li> + </ul> + </dd> </dl> <p class="warning"><b>Warning:</b> @@ -67,6 +91,17 @@ devices. For instance, don't try to open low-level sockets to create a communica channel. </p> +<p>Android Wear supports multiple wearables connected to a handheld device. For example, when the +user saves a note on a handheld, it automatically appears on both of the user's Wear devices. To +synchronize data between devices, Google’s servers host a cloud node in the network of devices. The +system synchronizes data to directly connected devices, the cloud node, and to wearable devices +connected to the cloud node via Wi-Fi.</p> + +<img src="{@docRoot}wear/images/wear_cloud_node.png" alt="" width="330" height="375"/> +<p class="img-caption"><strong>Figure 1.</strong> A sample network of nodes with +handheld and wearable devices.</p> + + <h2>Lessons</h2> <dl> <dt><a href="{@docRoot}training/wearables/data-layer/accessing.html">Accessing the Wearable Data Layer</a></dt> |