How to set the background-color of the items in Ham Button type programmatically

[wann2]

I'd like to set the background-color of the items in Ham Button type programmatically.
All items of them are set with random color as its background.
How can I do it?

[kayhanakbay]

Example :

return new HamButton.Builder()
.normalImageRes(imageRes)
.shadowCornerRadius(Util.dp2px(10))
.rippleEffect(true)
.buttonCornerRadius(Util.dp2px(10))
.textSize(14)
.subTextSize(12)
.imagePadding(new Rect(10, 10, 10, 10))
.normalColorRes(R.color.design_default_color_background)
.typeface(Typeface.DEFAULT_BOLD)
.normalTextColorRes(R.color.white)
.normalText(normalText)
.subNormalText(subNormalText)
.listener(listener);