https://blog.wongcw.com/2018/12/02/%e5%9c%8b%e8%a1%8c%e8%ab%be%e5%9f%ba%e4%ba%9e7-plus%e9%96%8b%e5%a7%8b%e5%8d%87%e7%b4%9a%e7%82%baandroid-9-0%e7%b3%bb%e7%b5%b1/