https://blog.wongcw.com/2018/10/04/%e5%be%ae%e4%bf%a1-v6-7-3-for-android-%e6%ad%a3%e5%bc%8f%e7%89%88-%e6%94%af%e6%8c%81diy%e8%a1%a8%e6%83%85/