public InputFilter filterAlphaNum = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        Pattern ps = Pattern.compile("^[a-zA-Z0-9]*$");
        if (!ps.matcher(source).matches()) {
            return "";
        }
        return null;
    }
};

public InputFilter filterKor = new InputFilter() {
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        Pattern ps = Pattern.compile("^[ㄱ-ㅣ가-힣]*$");
        if (!ps.matcher(source).matches()) {
            return "";
        }
        return null;
    }
};

editText.setFilters(new InputFilter[]{filterAlphaNum});