Question

我正在编写一个简单的Android应用程序，我需要使用MessageApi从Wear设备向我的手机发送消息。最终，我希望能够从我的衣服发送消息到手机，然后再用同一节点发回消息。

要开始，我只想点击我的Wear应用程序上的一个按钮，该按钮将在我的移动应用程序中生成一个祝酒词。我正在使用Android Wear模拟器和实际的Android手机进行测试。

我的Android移动应用程序有一个单独的ListenerService类;

public class ListenerService extends WearableListenerService {

    String nodeId;

    @Override
    public void onMessageReceived(MessageEvent messageEvent) {
        nodeId = messageEvent.getSourceNodeId();
        showToast(messageEvent.getPath());
    }

    private void showToast(String message) {
        Toast.makeText(this, message, Toast.LENGTH_LONG).show();
    }
}

我在我的清单中宣布这一点：

<service
  android:name=".ListenerService" >
    <intent-filter>
       <action android:name="com.google.android.gms.wearable.BIND_LISTENER" />
    </intent-filter>
</service>

在我的Wear MainActivity.java中;

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initApi();

        final WatchViewStub stub = (WatchViewStub) findViewById(R.id.watch_view_stub);
        stub.setOnLayoutInflatedListener(new WatchViewStub.OnLayoutInflatedListener() {
            @Override
            public void onLayoutInflated(WatchViewStub stub) {
                setupWidgets();
            }
        });
    }

    /**
     * Initializes the GoogleApiClient and gets the Node ID of the connected device.
     */
    private void initApi() {
        client = getGoogleApiClient(this);
        retrieveDeviceNode();
    }

    /**
     * Sets up the button for handling click events.
     */
    private void setupWidgets() {
        findViewById(R.id.btn_toast).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                sendToast();
            }
        });
    }

    /**
     * Returns a GoogleApiClient that can access the Wear API.
     * @param context
     * @return A GoogleApiClient that can make calls to the Wear API
     */
    private GoogleApiClient getGoogleApiClient(Context context) {
        return new GoogleApiClient.Builder(context)
                .addApi(Wearable.API)
                .build();
    }

    /**
     * Connects to the GoogleApiClient and retrieves the connected device's Node ID. If there are
     * multiple connected devices, the first Node ID is returned.
     */
    private void retrieveDeviceNode() {
        new Thread(new Runnable() {
            @Override
            public void run() {
                client.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
                NodeApi.GetConnectedNodesResult result =
                        Wearable.NodeApi.getConnectedNodes(client).await();
                List<Node> nodes = result.getNodes();
                if (nodes.size() > 0) {
                    nodeId = nodes.get(0).getId();
                }
                client.disconnect();
            }
        }).start();
    }

    /**
     * Sends a message to the connected mobile device, telling it to show a Toast.
     */
    private void sendToast() {
        if (nodeId != null) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    client.blockingConnect(CONNECTION_TIME_OUT_MS, TimeUnit.MILLISECONDS);
                    Wearable.MessageApi.sendMessage(client, nodeId, MESSAGE, null);
                    client.disconnect();
                }
            }).start();
        }
    }
}

调试时，nodeId始终为null，因此run()命令永远不会在sendToast()函数中运行。但是，当我在Wearable.NodeApi.getConnectedNodes(client).await()的{{1}}上插入断点时，我的应用只是冻结，似乎无法连接到任何节点。

我有什么遗漏或做错了吗？

无法从Android Wear向主机设备

0 个答案: