ripples_pie_regression_2

ripple_runtime.kt

private fun updateButtonView(button: View) {
    val radius = // ...

    val color = // ...

    val contentOuterRadii = floatArrayOf(radius, radius, radius, radius, radius, radius, radius, radius)

    val buttonShape = RoundRectShape(contentOuterRadii, null, null)

    if (button.background != null) {
      val ripple = button.background as RippleDrawable
      (ripple.getDrawable(0) as ShapeDrawable).apply { // content
        shape = buttonShape
      }
      (ripple.getDrawable(1) as ShapeDrawable).apply { // mask
        shape = buttonShape
      }
    } else {
      @ColorInt val maskColor = resources.getColor(R.color.white)
      val maskShapeDrawable = ShapeDrawable(buttonShape).apply {
        paint.color = maskColor
      }

      val contentShapeDrawable = ShapeDrawable(buttonShape).apply {
        paint.color = color
      }

      button.background = RippleDrawable(ColorStateList.valueOf(maskColor), contentShapeDrawable, maskShapeDrawable)
    }
  }