code: public static void d(String tag, String msg) {
          if (logger != null && isLoggingEnabled(tag, DEBUG)) {
              logger.d(tag, msg);
          }
      }
docs: Send a DEBUG message.
  @param tag Used to identify the source of a log message.  It usually identifies
  the class or activity where the log call occurs.
  @param msg The message you would like logged.