code: public void onReceivedStopJob() {
          mShowStopView.setBackgroundColor(stopJobColor);
          Message m = Message.obtain(mHandler, MSG_UNCOLOUR_STOP);
          mHandler.sendMessageDelayed(m, 2000L); // uncolour in 1 second.
          mParamsTextView.setText("");
      }
docs: Receives callback from the service when a job that previously landed on the app must stop
  executing. Colours the UI and post a message to uncolour it after a second.