title: Update foreground service notificaton from Activity
body: <p>I have a foreground service in my app, which has a dynamically updated text in the notification, and I can update it just fine from withing the service with</p>
  
  <pre><code>    startForeground(Constants.FOREGROUND_ID, buildForegroundNotification());
  }
  
  private Notification buildForegroundNotification() {
      NotificationCompat.Builder b = new NotificationCompat.Builder(this);
      b.setOngoing(true);
      b.setContentIntent(getPendingIntent(this));
      b.setContentTitle(getString(R.string.app_name));
      b.setContentText(getString(R.string.time) + " " + number);
      b.setSmallIcon(R.drawable.ic_launcher);
      return b.build();
  }
  </code></pre>
  
  <p>But I want to also be able to update it from the Activity, how can I do that without restarting the service?</p>