In order to simplify this process and make sure that you will not leave any traces, we recommend that you use the free application, Funter, which finds all system hidden files in any location on Mac.
If you want to delete your projects as well, find the AndroidStudioProjects folder in your Home folder and remove it.Quit Android Studio and remove it from the Applications folder.
The manual way will require some time and energy, as Android Studio creates tons of service files, which you will need to find and remove manually.
