public static int v(String tag, String msg, Throwable tr) {
    return println(android.util.Log.VERBOSE, tag, msg + '\n' + android.util.Log.getStackTraceString(tr));
  }
Intercept the origin log logged by {@link android.util.Log}, and pass it to specific {@link Printer}.
xlog-libcat/src/main/java/com/elvishew/xlog/libcat/internal/Cat.java