I am currently working for my professor and there was a programmer before me that built the app. I am trying to convert his APK file into my own Android Studio for the full code so I can make updates and re-publish it onto the google play store. I've read online about converter tools and using decompilers, but I am never able to run the actual app once all is said and done, because the green run button is faded out and unclickable. So my question is, is it possible to accomplish what I'm trying to do?