可穿戴式听众

Question

我试图通过从watch发送触发信号在Android中执行命令。我的手机部分如下所示。

package com.example.myapplication;

import android.app.Service;
import android.util.Log;

import com.google.android.gms.wearable.MessageApi;
import com.google.android.gms.wearable.MessageEvent;

public abstract class WearableListenerServiceForWear
    extends Service implements  MessageApi.MessageListener {
  private static final String HELLO_WORLD_WEAR_PATH = "/hello-world-wear";

  @Override
  public void onMessageReceived(MessageEvent messageEvent) {

    if (messageEvent.getPath().equals(HELLO_WORLD_WEAR_PATH)) {
      try {
        command
      } catch (Exception ex) {
        ex.printStackTrace();
      }
      ;//null pointer check in case package name was not found
    } else {
      Log.e("TAG",
              "Failed to send message with status code: ");
    }
  }
}

在手机部分我使用此代码发送消息：

private void sendMessage() {
        if (mNode != null && mGoogleApiClient != null && mGoogleApiClient.isConnected()) {
          Wearable.MessageApi.sendMessage(mGoogleApiClient, mNode.getId(), HELLO_WORLD_WEAR_PATH, null)
              .setResultCallback(new ResultCallback<MessageApi.SendMessageResult>() {
                @Override public void onResult(MessageApi.SendMessageResult sendMessageResult) {
                  if (!sendMessageResult.getStatus().isSuccess()) {
                    Log.e("TAG",
                        "Failed to send message with status code: " + sendMessageResult.getStatus()
                            .getStatusCode());
                  }
                }
              });
        } else {
          //Improve your code
        }
      }

没有错误显示。这两个应用程序在手表和手机上运行良好。但命令没有触发。代码有什么问题吗？