How to extract number from Spinner?

Question

Android

Good day!
The next point is of interest - how can you equate a certain Spinner string to a certain number. Perhaps the question was asked a little incorrectly...
There are Roman numerals I II III IV getting them as a string from the Spinner is not a problem. How to equate (convert) them to type int (1,2,3,4) respectively?
As a last resort... I think you can get the numeric part with a regular expression (or google guava), only then change the Roman numerals to Arabic... How would you do it?
The goal is to get a value from the spinner, bind a certain number to them, in order to further calculate according to the formula...

Answer 1

spinner.setOnItemSelectedListener(....)