code: public static void log(Object source, int priority, String format, Object... args) {
      log(source, priority, null, format, args);
    }
docs: Logs a formatted string to the console using the source object's name as the log tag. If the
  source object is null, the default tag (see {@link LogUtils#TAG}) is used.
  
  <p>Example usage: <br>
  <code>
  LogUtils.log(this, Log.ERROR, "Invalid value: %d", value);
  </code>
  
  @param source The object that generated the log event.
  @param priority The log entry priority, see {@link Log#println(int, String, String)}.
  @param format A format string, see {@link String#format(String, Object...)}.
  @param args String formatter arguments.