I want to completely disconnect my app from Firebase. This question has been asked several times (e.g here). Most of the answers focus on disconnecting an app from Firebase within the Firebase console and not within Android studio.
After disconnecting my app from the Firebase console. Everytime I try to reconnect the app to another Firebase project, an error balloon pops up stating that the app is already part of a Firebase project. I know this behaviour occurs because some files from the old Firebase project are still present. How do I get rid of them?
You should undo all the steps that you are instructed to perform in the manual integration. So, remove all Firebase dependencies from build.gradle, remove the Google Services plugin from the bottom of build.gradle, and remove the google-services.json file.