https://blog.wongcw.com/2021/02/16/%e6%9c%aa%e4%be%86%e5%96%ae%e6%89%8b%e6%a8%a1%e5%bc%8f%e5%b0%87%e6%88%90android%e6%89%8b%e6%a9%9f%e6%a8%99%e9%85%8d%e8%b0%b7%e6%ad%8c%e6%ba%96%e5%82%99%e5%b0%87%e5%85%b6%e7%b4%8d%e5%85%a5aosp%e9%a0%85/