通过WearableListenerService将数据发送到可穿戴设备

时间:2016-07-23 18:23:57

标签: android service wear-os android-wear-data-api

我有一个表盘,我希望使用数据层发送一些字符串。我通过将服务添加到清单并创建DataLayerListenerService类来跟踪guide

我应该怎样做才能从服务中向可穿戴设备发送数据?我在配置活动中使用PutDataRequest之前已经这样做了。我现在想定期向可穿戴设备发送电池统计数据,天气信息等。我该怎么做?

到目前为止,这是我的班级:

public class DataLayerListenerService extends WearableListenerService {

private static final String TAG = DataLayerListenerService.class.getSimpleName();
public static final String EXTRAS_PATH = "/extras";
private static final String START_ACTIVITY_PATH = "/start-activity";
private static final String DATA_ITEM_RECEIVED_PATH = "/data-item-received";
private GoogleApiClient mGoogleApiClient;

public static void LOGD(final String tag, String message) {
    if (Log.isLoggable(tag, Log.DEBUG)) {
        Log.d(tag, message);
    }
}

@Override
public void onCreate() {
    super.onCreate();
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(Wearable.API)
            .build();
    mGoogleApiClient.connect();
}

@Override
public void onDataChanged(DataEventBuffer dataEvents) {
    LOGD(TAG, "onDataChanged: " + dataEvents);
    if (!mGoogleApiClient.isConnected() || !mGoogleApiClient.isConnecting()) {
        ConnectionResult connectionResult = mGoogleApiClient
                .blockingConnect(30, TimeUnit.SECONDS);
        if (!connectionResult.isSuccess()) {
            Log.e(TAG, "DataLayerListenerService failed to connect to GoogleApiClient, "
                    + "error code: " + connectionResult.getErrorCode());
            return;
        }
    }

    // Loop through the events and send a message back to the node that created the data item.
    for (DataEvent event : dataEvents) {
        Uri uri = event.getDataItem().getUri();
        String path = uri.getPath();
        if (EXTRAS_PATH.equals(path)) {
            // Get the node id of the node that created the data item from the host portion of
            // the uri.
            String nodeId = uri.getHost();
            // Set the data of the message to be the bytes of the Uri.
            byte[] payload = uri.toString().getBytes();

            // Send the rpc
            Wearable.MessageApi.sendMessage(mGoogleApiClient, nodeId, DATA_ITEM_RECEIVED_PATH,
                    payload);
        }
    }
}

1 个答案:

答案 0 :(得分:1)

首先,如果要与Google Play服务库中提供的某个Google API建立连接,请创建GoogleApiClient的实例。您需要创建GoogleApiClient实例(“Google API客户端”)。 Google API客户端提供了所有Google Play服务的通用入口点,并管理用户设备与每个Google服务之间的网络连接。

定义接收WearableListenerServicemessage。它接收来自其他节点的事件,例如数据更改,消息或连接事件。

通过MessageApi发送消息,消息将传递到连接的网络节点。多个可穿戴设备可以连接到用户的手持设备。网络中的每个连接设备都被视为节点。对于多个连接的设备,您必须考虑哪些节点接收消息。

然后实施与addListener(GoogleApiClient, MessageApi.MessageListener)一起使用的MessageApi.MessageListener来接收消息事件。希望在后台通知事件的呼叫者应使用WearableListenerService。然后,接收消息并使用LocalBroadcastManager详细说明消息并显示磨损值。

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