https://blog.wongcw.com/2018/10/14/%e8%b0%b7%e6%ad%8c%e5%ae%a3%e5%b8%83%e5%b0%86%e5%8a%a0%e5%af%86android-9-0%e7%94%a8%e6%88%b7%e7%9a%84%e4%ba%91%e7%ab%af%e5%a4%87%e4%bb%bd%ef%bc%9a%e5%af%86%e5%8c%99%e5%9f%ba%e4%ba%8e%e9%94%81%e5%b1%8f/