Android studio - java - mysql connection

Hello! I am trying to make a simple connection to my database, but for some reason I just can't do it? I have followed tutorials, such as: or https://parallelcodes.com/android-connect-mysql-database/
My issue is that once I insert the class.formane(com.mysql.blabalba), my app just crashes?
Is there anyone that could help me please? I really don't understand why my app doesn't want to function...