Android开发动态设置drawable圆角背景，虚线等

/**
 * 画边框方法

 * @param color      背景色
 * *
 * @param radius     圆角
 * *
 * @param stockWidth 边框宽度
 * *
 * @param stockColor 边框颜色
 * *
 * @param dashWidth  边框线间隔
 * *
 * @param dashGap    边框线长度
 * *
 * @return
 */
fun getShapeDrawable(color: Int, radius: Float, stockWidth: Int? = null, stockColor: Int? = null, dashWidth: Float? = null, dashGap: Float? = null): GradientDrawable {
    val gradientDrawable = GradientDrawable()
    val stockWidth = stockWidth ?: 0
    val stockColor = stockColor ?: Color.parseColor("#ffffff")
    val dashWidth = dashWidth ?: 0f
    val dashGap = dashGap ?: 1f
    gradientDrawable.cornerRadius = radius
    gradientDrawable.setColor(color)
    gradientDrawable.setStroke(stockWidth, stockColor, dashWidth, dashGap)
    return gradientDrawable
}

/**
 * 画边框  倒圆角
 * @param color
 * *
 * @param topLeftRadius
 * *
 * @param topRightRadiu
 * *
 * @param bottomLeftRadius
 * *
 * @param bottomRightRadius
 * *
 * @param stockWidth
 * *
 * @param stockColor
 * *
 * @return
 */
fun getShapeDrawable(color: Int, topLeftRadius: Float, topRightRadiu: Float, bottomLeftRadius: Float, bottomRightRadius: Float, stockWidth: Int?, stockColor: Int?): GradientDrawable {
    var stockWidth = stockWidth
    var stockColor = stockColor
    val gradientDrawable = GradientDrawable()
    val f = floatArrayOf(topLeftRadius, topLeftRadius, topRightRadiu, topRightRadiu, bottomLeftRadius, bottomLeftRadius, bottomRightRadius, bottomRightRadius)
    gradientDrawable.cornerRadii = f
    gradientDrawable.setColor(color)
    stockWidth = if (stockWidth == null) 0 else stockWidth
    stockColor = if (stockColor == null) Color.parseColor("#ffffff") else stockColor
    gradientDrawable.setStroke(stockWidth, stockColor)
    return gradientDrawable
}

可以避免创建很多xml的背景，提高开发效率