How to determine if an Android Wear device is connected

android_wearable_connected

  private boolean isConnectedToWearable = false;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (!servicesAvailable()) {
        finish();
    }

    setContentView(R.layout.activity_main);

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addApi(Wearable.API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();
  }
  
  @Override
  protected void onResume() {
      super.onResume();
      mGoogleApiClient.connect();
  }

  @Override
  protected void onPause() {
      super.onPause();
      mGoogleApiClient.disconnect();
      isConnectedToWearable = false;
  }
  
  @Override
  public void onConnected(Bundle dataBundle) {
      if (servicesAvailable()) {
          new CheckWearableConnected().execute();
      }
  }
  
  private boolean servicesAvailable() {
    // Check that Google Play Services are available
    int resultCode = GooglePlayServicesUtil
            .isGooglePlayServicesAvailable(this);

    return (ConnectionResult.SUCCESS == resultCode);
  }
    
  private class CheckWearableConnected extends AsyncTask<Void, Void, Void> {

      @Override
      protected Void doInBackground(Void... voids) {
          NodeApi.GetConnectedNodesResult nodes =
                  Wearable.NodeApi.getConnectedNodes(mGoogleApiClient).await();

          if (nodes != null && nodes.getNodes().size() > 0) {
              isConnectedToWearable = true;
          }

          return null;
      }
  }
}