Live editing of users input

Question

Is it possible to auto insert characters into an EditText as the user inputs data?

I.e. if the user is entering a long number such as <

Answer 1

@Override
public void afterTextChanged(Editable s) {

    if(s.length() == 3 && len < s.length()){
        s.append(" - ");
    }

}

@Override
public void beforeTextChanged(CharSequence s, int start, int count,
        int after) {
    len = s.length();
}

This will do as well, only this code will insert " - " after 3rd character.