If you examine the files on your home folder (where Android Studio is normally installed) using your favorite file manager (Nemo, MC or Double-Commander, etc), you will find the following Android Studio files (assuming that you have the hidden files revealed):
- .AndroidStudio2.x (where 'x' can represent any version number of Android Studio)
- .gradle (this file may or may not be on your PC)
- .local/share/applications/Android Studio.desktop
- Desktop/Android Studio.desktop
Also note that the first directory in the list above can consist of several directories if you have updated Android Studio from prior versions; i.e., there may be several directories called '.AndroidStudio1.x', '.AndroidStudio2.x', etc.
To uninstall Android Studio from your PC, you need to delete ALL the directories and files listed above. Use your file manager to carry out this task. Then, if you have installed a launcher in your panel, right-click on this item and select 'Remove'.
Make sure that ALL the files are deleted, then carry out a reboot (or restart) of your PC just to be on the safe side. Once you are logged in, you should find that Android Studio is no longer on your PC.
Note that although this article was written specifically for a Debian Linux 8.x system, it can be easily tweaked to apply to any Linux PC.
That's it! Enjoy.