https://ferrand-d.medium.com/paging-image-gallery-with-recyclerview-f059d035b7e7

PagingImageGallery_parentDimensions.kt

private var hasInitParentDimensions = false
private var maxImageWidth: Int = 0
private var maxImageHeight: Int = 0
private var maxImageAspectRatio: Float = 1f

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VH {
    if (!hasInitParentDimensions) {
        maxImageWidth = parent.width
        maxImageHeight = parent.height
        maxImageAspectRatio = maxImageWidth.toFloat() / maxImageHeight.toFloat()
        hasInitParentDimensions = true
    }

    return VH(ImageView(parent.context))
}