I have tired using different methods of connecting my android App written in Kotlin to a localhost of mysql server but it’s not working…any suggestions?
Try localtest.me instead of localhost 
Edit: Maybe you should set the MySql server ip, is localhost the Android device?
localtest.me doesn’t work. Am running the App on an android emulator. The database is on a different machine.
If the database is on a different machine you will have to use the IP of that machine, localhost refers to the current machine.