如何使用多个连接的设备在手机中识别我的Wear Node



在我的手机中,此代码将返回所有连接的节点:

Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).setResultCallback(new ResultCallback<NodeApi.GetConnectedNodesResult>() {
    @Override
    public void onResult(NodeApi.GetConnectedNodesResult getConnectedNodesResult) {
        Log.d(TAG, "Nodes: " + getConnectedNodesResult.getNodes());
    }
});

这是为每个断开连接的节点调用的:

@Override
public void onPeerDisconnected(Node peer) {    
   // Which peer is this?
}

onPeerDisconnected:手册

Notification that a peer has been disconnected from this node or is no 
longer reachable by this node.
Since multiple nodes can be connected to a network at the same time, 
peer connected and disconnected events can come in any order.

我怎么知道我的Wear在手机中断开了连接?而不是任何其他连接的设备?

通常,我们不喜欢用节点的形状因子"mobile/watch/…"来标记节点,而是提供一种方式,每个节点可以广播其"能力",其他节点可以查询连接设备的网络,以查看哪些节点提供了所需的"能力"。这是通过使用CapabilityApis来完成的。我们在一些官方示例中使用了这些API,因此您可以看到它们的实际应用。例如,你的手机应用程序可以广播它支持"转录功能",你的穿戴应用程序可以找到那些提供该功能的节点,以决定将语音流发送到哪里进行转录。这提供了一个灵活和可扩展的框架,当生态系统增长时,该框架将继续工作。

Ali说的很对,但如果你真的需要设备的节点,那么NodeApi.GetLocalNodeResult也有API。

以下部分向您展示了如何宣传可以处理活动请求的设备节点,发现能够满足请求需求的节点,并向这些节点发送消息,

广告功能

要从可穿戴设备在手持设备上启动活动,请使用MessageApi类发送请求。由于多个可穿戴设备可以连接到手持设备,因此可穿戴应用程序需要确定连接的节点是否能够启动活动。在手持应用程序中,宣传其运行的节点提供特定功能。

要宣传您的手持应用程序的功能:

在项目的res/values/目录中创建一个XML配置文件,并将其命名为wear.XML。将名为android_wear_capabilities的资源添加到wear.xml中。定义设备提供的功能。

<resources>
    <string-array name="android_wear_capabilities">
        <item>android_wear</item>
    </string-array> 
</resources>

检索具有所需功能的节点

最初,您可以通过调用CapabilityApi.getCapability((方法来检测有能力的节点。以下示例显示了如何使用android_wear功能手动检索可达节点的结果。在磨损模块中使用以下代码:

public abstract class BaseActivity extends Activity implements MessageApi.MessageListener, NodeApi.NodeListener,
    DataApi.DataListener, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
private static final String
        SMART_WEAR_CAPABILITY_NAME = "android_wear";
protected GoogleApiClient mGoogleApiClient;
protected ArrayList<String> results;
private String TAG = "BaseActivity::Wear";
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(Wearable.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
}
private Collection<String> getNodes() {
    results = new ArrayList<>();
    NodeApi.GetConnectedNodesResult nodes =
            Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).await();
    for (Node node : nodes.getNodes()) {
        Log.d(TAG, node.getId());
        results.add(node.getId());
    }
    return results;
}
@Override
protected void onResume() {
    super.onResume();
    mGoogleApiClient.connect();
}
@Override
protected void onPause() {
    super.onPause();
    Wearable.MessageApi.removeListener(mGoogleApiClient, this);
    Wearable.NodeApi.removeListener(mGoogleApiClient, this);
    Wearable.DataApi.removeListener(mGoogleApiClient, this);
    mGoogleApiClient.disconnect();
}
@Override
public void onConnected(Bundle bundle) {
    Log.d(TAG, "onConnected(): Successfully connected to Google API client");
    Wearable.MessageApi.addListener(mGoogleApiClient, this);
    Wearable.DataApi.addListener(mGoogleApiClient, this);
    Wearable.NodeApi.addListener(mGoogleApiClient, this);
    results = new ArrayList<>();
    getNodeIdOfHandheldDevice();
}
@Override
public void onConnectionSuspended(int i) {
    Log.d(TAG, "onConnectionSuspended(): Connection to Google API client was suspended");
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
    Log.e(TAG, "onConnectionFailed(): Failed to connect, with result: " + connectionResult);
}
@Override
public void onPeerConnected(Node node) {
    Log.e(TAG, "onPeerConnected():");
}
@Override
public void onPeerDisconnected(Node node) {
    Log.e(TAG, "onPeerDisconnected():");
}
private void getNodeIdOfHandheldDevice() {
    Wearable.CapabilityApi.getCapability(
            mGoogleApiClient, SMART_WEAR_CAPABILITY_NAME,
            CapabilityApi.FILTER_REACHABLE).setResultCallback(
            new ResultCallback<CapabilityApi.GetCapabilityResult>() {
                @Override
                public void onResult(CapabilityApi.GetCapabilityResult result) {
                    if (result.getStatus().isSuccess()) {
                        updateFindMeCapability(result.getCapability());
                    } else {
                        Log.e(TAG,
                                "setOrUpdateNotification() Failed to get capabilities, "
                                        + "status: "
                                        + result.getStatus().getStatusMessage());
                    }
                }
            });
}
private void updateFindMeCapability(CapabilityInfo capabilityInfo) {
    Set<Node> connectedNodes = capabilityInfo.getNodes();
    if (connectedNodes.isEmpty()) {
        results.clear();
    } else {
        for (Node node : connectedNodes) {
            // we are only considering those nodes that are directly connected
            if (node.isNearby()) {
                results.add(node.getId());
            }
        }
    }
}
}

有关更多详细信息,请查看Android Dev

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