https://blog.wongcw.com/2020/10/13/%e8%b0%b7%e6%ad%8c%e7%aa%81%e7%84%b6%e9%97%9c%e4%b8%8a%e4%ba%86%e5%9c%a8%e9%9d%9eandroid-go%e8%a8%ad%e5%82%99%e4%b8%8a%e5%ae%89%e8%a3%9dgmail-go%e9%83%b5%e4%bb%b6%e5%ae%a2%e6%88%b6%e7%ab%af%e7%9a%84/