I usually start out with https://www.gitignore.io/api/androidstudio

That should work even if all IDE-specific files are excluded, right?

One way to check if your setup works would be to clone the repository to a new directory and try to open it. Simulate a new person joining the project

It works. One do not need any IDEA config files in repository with properly configured build system. IDEA imports its configs from the build system (at least for me it works with Maven)