/**
     * Method getByteValue.
     *
     * @param s a s object.
     * @param strict a strict object.
     * @param parser a parser object.
     * @param attribute a attribute object.
     * @throws XmlPullParserException XmlPullParserException if
     * any.
     * @return byte
     */
    private byte getByteValue(String s, String attribute, XmlPullParser parser, boolean strict)