GridLayoutManager で 最初の行だけ打ち抜きで表示する

gridlayoutmanager.kt

        recyclerView.also { recyclerView ->
            val columnsNum = 3
            val layoutManager = GridLayoutManager(applicationContext, columnsNum)

            layoutManager.spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
                override fun getSpanSize(position: Int): Int {
                    return when (position) {
                        0 -> columnsNum
                        else -> 1
                    }
                }
            }


            recyclerView.layoutManager = layoutManager
            recyclerView.adapter = HogeAdapter()
        }