code: public void start() {
          this.mHandlerThread = new HandlerThread("notification-handler-thread");
          this.mHandlerThread.start();
          this.mHandler = new SPFNotificationHandler(mHandlerThread.getLooper());
          mHandler.postSetup(this);
          isRunning = true;
      }
docs: Initialize and start all the threads and resources used by
  SPFNotification service. Call this method to initialize the logic that
  handles triggers processing.