https://blog.wongcw.com/2018/08/01/%e5%85%8droot%e6%a9%9f%e5%8e%bb%e5%bb%a3%e5%91%8a%ef%bc%81%e5%90%91%e7%b6%b2%e9%a0%81%e8%88%87app%e5%85%a7%e5%bb%a3%e5%91%8a%e8%aa%aa%e5%86%8d%e8%a6%8b/