Build Coupon UI - Setup paint

CouponLayout.kt

class CouponLayout : FrameLayout {
    private var borderWidth = /* ... */
    private var backgroundPathColor = /* ... */
    private var backgroundPathColorStateList: ColorStateList? = /* ... */
    private var borderPathColor = /* ... */
    private var borderPathColorStateList: ColorStateList? = /* ... */
    /* ... */
    private val borderPaint = Paint().apply { isAntiAlias = true }
    private val backgroundPaint = Paint().apply { isAntiAlias = true }
    /* ... */
    private fun setupPaint() {
        borderPaint.color = getAvailableColor(borderPathColor, borderPathColorStateList)
        borderPaint.strokeWidth = borderWidth
        borderPaint.style = Paint.Style.STROKE
        backgroundPaint.color = getAvailableColor(backgroundPathColor, backgroundPathColorStateList)
        backgroundPaint.style = Paint.Style.FILL
    }

    @ColorInt
    private fun getAvailableColor(@ColorInt color: Int, colorStateList: ColorStateList?): Int = if (colorStateList != null) {
        val defaultColor = colorStateList.getColorForState(intArrayOf(), 0)
        colorStateList.getColorForState(drawableState, defaultColor)
    } else {
        color
    }
}