A CardView that supports clipping content of non-uniform shapes. [MaterialCardView] doesn't round corners on older devices when all corners aren't equal in shape and size.

MaskedCardView.kt

val cardView: MaskedCardView

fun usageExample() {
    // Each corner can have a different radius
    val shapeBuilder = cardView.shapeAppearanceModel.toBuilder()
        .setTopLeftCornerSize(AbsoluteCornerSize(dpToPx(12f)))
        .setBottomRightCornerSize(AbsoluteCornerSize(dpToPx(6f)))

    cardView.shapeAppearanceModel = shapeBuilder.build()
    
    // [MaterialCardView] disables content clipping if all corners aren't equal in shape and size,
    // we can safely enable it again whenever we set a new shapeAppearanceModel.
    cardView.clipToOutline = true
}

/**
 * A CardView that supports clipping content of non-uniform shapes.
 *
 * [MaterialCardView] doesn't round corners on older devices when all corners aren't equal in shape and size.
 *
 * Based on [github.com/android/sunflower](https://github.com/android/sunflower/blob/main/app/src/main/java/com/google/samples/apps/sunflower/views/MaskedCardView.kt)
 */
open class MaskedCardView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyle: Int = R.attr.materialCardViewStyle
) : MaterialCardView(context, attrs, defStyle) {

    @SuppressLint("RestrictedApi")
    private val pathProvider = ShapeAppearancePathProvider()
    private val maskPath = Path()
    private val maskBounds = RectF()

    override fun onDraw(canvas: Canvas) {
        canvas.clipPath(maskPath)
        super.onDraw(canvas)
    }

    @SuppressLint("RestrictedApi")
    override fun onSizeChanged(w: Int, h: Int, oldw: Int, oldh: Int) {
        super.onSizeChanged(w, h, oldw, oldh)

        if (w != oldw || h != oldh) {
            maskBounds.right = w.toFloat()
            maskBounds.bottom = h.toFloat()

            pathProvider.calculatePath(shapeAppearanceModel, 1f, maskBounds, maskPath)
        }
    }

    override fun setShapeAppearanceModel(shapeAppearanceModel: ShapeAppearanceModel) {
        super.setShapeAppearanceModel(shapeAppearanceModel)

        pathProvider.calculatePath(shapeAppearanceModel, 1f, maskBounds, maskPath)
    }
}