Escribir en un EditText tipo tarjeta de crédito

private TextWatcher creditCardTextWatcher = new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
    }

    @Override
    public void afterTextChanged(Editable editable) {
        String creditCardNumber = editable.toString().replace(" ", "");
        if (creditCardNumber.length() >= 4) {
            creditCardNumber = creditCardNumber.substring(0, 4) + " " + creditCardNumber.substring(4);
        }
        if (creditCardNumber.length() >= 9) {
            creditCardNumber = creditCardNumber.substring(0, 9) + " " + creditCardNumber.substring(9);
        }
        if (creditCardNumber.length() >= 14) {
            creditCardNumber = creditCardNumber.substring(0, 14) + " " +