Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in D:\xxxx\app\build\outputs\mapping\release\missing_rules.txt.

问题：Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in D:\xxxx\app\build\outputs\mapping\release\missing_rules.txt.
方案：
在文件夹浏览器打开：D:\xxxx\app\build\outputs\mapping\release\missing_rules.txt，将里面的内容复制到proguard-rules.pro内，重新编译