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public Object evaluate(float fraction, Object startValue, Object endValue) {
    int startInt = (Integer) startValue;
    int startA = (startInt >> 24) & 0xff;
    int startR = (startInt >> 16) & 0xff;
    int startG = (startInt >> 8) & 0xff;
    int startB = startInt & 0xff;

    int endInt = (Integer) endValue;
    int endA = (endInt >> 24) & 0xff;
    int endR = (endInt >> 16) & 0xff;
    int endG = (endInt >> 8) & 0xff;
    int endB = endInt & 0xff;

    return (int) ((startA + (int) (fraction * (endA - startA))) << 24) |
            (int) ((startR + (int) (fraction * (endR - startR))) << 16) |
            (int) ((startG + (int) (fraction * (endG - startG))) << 8) |
            (int) ((startB + (int) (fraction * (endB - startB))));
}