@Override
    public void onKeyboardClick(KeyboardButtonEnum keyboardButtonEnum) {
        if (mPinCode.length() < this.getPinLength()) {
            int value = keyboardButtonEnum.getButtonValue();

            if (value == KeyboardButtonEnum.BUTTON_CLEAR.getButtonValue()) {
                if (!mPinCode.isEmpty()) {
                    setPinCode(mPinCode.substring(0, mPinCode.length() - 1));
                } else {
                    setPinCode("");
                }
            } else {
                setPinCode(mPinCode + value);
            }
        }
    }
Add the button clicked to {@link #mPinCode} each time.
Refreshes also the {@link com.github.omadahealth.lollipin.lib.views.PinCodeRoundView}
lib/src/main/java/com/github/omadahealth/lollipin/lib/managers/AppLockActivity.java