Warning ... can't find referenced class ...
Warning: there were ... unresolved references to classes or interfaces ...
You may need to specify additional library jars (using '-libraryjars') ...
很遗憾,Firebase没有关于使用ProGuard的官方文档。
当使用ProGuard混淆时,我需要哪些指令才能成功编译带有Firebase的应用程序版本?