code: public static void timeCheck(String extra) {
          if (startCheckTime > 0) {
              long now = System.currentTimeMillis();
              long diff = now - nextCheckTime;
              nextCheckTime = now;
              Log.d(Log.SUBSYSTEM.TRACING, "FPSCounter", "[%d, %d] timeCheck: %s", now, diff, extra);
          }
      }
docs: Computes execution time
  @param extra