android edittext limit to text and numbers

Question

I am creating an android application. The first thing I'm creating is a login activity. I am trying to limit the username edittext just to text/numbers only (no special characters). Is there a way to adjust this in the xml file?

Answer 1

I dont think you can limit the characters from xml. You could always use a InputFilter, but specifically android provides UsernameFilterGeneric to filter valid user names. You could also use UsernameFilterGMail

Answer 2

As you already use in java Regular expression.called the same class here for checking for particular field. let me know if you want some more if you didn't know about the RE.