https://blog.wongcw.com/2020/08/11/android%e7%89%88gboard%e8%bc%b8%e5%85%a5%e6%b3%95%e8%bf%8e%e4%be%86%e6%99%ba%e8%83%bd%e5%ae%8c%e6%88%90%e5%92%8c%e8%aa%9e%e9%9f%b3%e8%81%bd%e5%af%ab%e7%ad%89%e5%8a%9f%e8%83%bd%e6%9b%b4%e6%96%b0/