Bir Android uygulaması yaz

I would like to decrypt an android app (apk file) and create an android project which will run and re-deploy in Android studio. I want to change some parameters and re-create an apk file to run android mobile phone. I am going to share my file after the aggrement. PS: I have already decrypt the file and I can share also but I do not have knowledge about mobile app world, may be even small help is enough. thanks