https://blog.wongcw.com/2018/11/30/android%e7%ab%afswiftkey%e8%bc%b8%e5%85%a5%e6%b3%95%e6%9b%b4%e6%96%b0%ef%bc%9a%e7%8f%be%e5%8f%af%e7%9b%b4%e6%8e%a5%e6%90%9c%e7%b4%a2%e7%b6%b2%e9%a0%81%e5%85%a7%e5%ae%b9/