public static void config(boolean keepOriginLog, Printer output) {
    Cat.keepOriginLog = keepOriginLog;
    Cat.output = output;
  }
Config LibCat.

@param keepOriginLog whether the origin log logged by {@link android.util.Log} should be kept,
                     which means you can still see them in 'logcat', default to be true
@param output        specify a {@link Printer} to print the intercepted logs, can be null if
                     there is no need to print the logs to other place
xlog-libcat/src/main/java/com/elvishew/xlog/libcat/LibCat.java