Escribir en un EditText tipo tarjeta de crédito

public void showCreditCardNumber(String number) {
        String cardNumber = "";
        String[] arrayCreditCardNumber = number.split("");
        for (int i = 0; i < number.length(); i++) {
            if ((i + 1) % 4 == 0) {
                cardNumber = cardNumber + arrayCreditCardNumber[i] + " ";
            } else {
                cardNumber = cardNumber + arrayCreditCardNumber[i];
            }
        }
        editTextCreditCardNumber.setText(cardNumber);
    }