How do I use InputFilter to limit characters in an EditText in Android?

Question

I want to restrict the chars to 0-9, a-z, A-Z and spacebar only. Setting inputtype I can limit to digits but I cannot figure out the ways of Inputfilter looking through the

Answer 1

I have done something like this to keep it simple:

edit_text.filters = arrayOf(object : InputFilter {
    override fun filter(
        source: CharSequence?,
        start: Int,
        end: Int,
        dest: Spanned?,
        dstart: Int,
        dend: Int
    ): CharSequence? {
        return source?.subSequence(start, end)
            ?.replace(Regex("[^A-Za-z0-9 ]"), "")
    }
})

This way we are replacing all the unwanted characters in the new part of the source string with an empty string.

The edit_text variable is the EditText object we are referring to.

The code is written in kotlin.