我正在尝试使用网格布局（作为recyclerview的布局管理器）。对于某些物品，我希望有重量。

当项目重量等于列号时，它可以正常工作。但是当它小于它时，那是奇怪的。例如如果GridLayoutManager中的列数为3，并且我将第一项设置为权重3，则看起来像这样：

我该如何解决？

此外，我为项目之间的间距定义了项目装饰，而且看起来也没有对齐：

有什么想法要解决吗？

我的代码：

val columns = 3
    val recyclerViewLayoutManager = GridLayoutManager(context,columns) .apply {
        orientation = LinearLayoutManager.VERTICAL
    }

    recyclerViewLayoutManager.spanSizeLookup = (object : SpanSizeLookup() {
        override fun getSpanSize(position: Int): Int {
            return if(position==0) columns else 1
        }
    })

    val recyclerView: RecyclerView = view!!.findViewById(R.id.recycle1)
    recyclerView.apply {
        layoutManager = recyclerViewLayoutManager
        adapter = ItemAdapter(items)
        addItemDecoration(GridSpacingItemDecoration(20))
        setHasFixedSize(true)
    }

这是装饰物品：

class GridSpacingItemDecoration(space: Int) : RecyclerView.ItemDecoration() {
var spacing: Int = space

override fun getItemOffsets(outRect: Rect,view: View,parent: RecyclerView,state: RecyclerView.State) {
    super.getItemOffsets(outRect,view,parent,state)
    val layoutManager = parent.layoutManager as GridLayoutManager?

    val position = parent.getchildAdapterPosition(view) // item position

        val spanCount: Int
        val column: Int
        // Check the last item and is alone. Then set the parent's width
        if (position == parent.adapter!!.itemCount - 1 && position % 2 == 0) {
            spanCount = 1
            outRect.left = spacing
            outRect.right = parent.width - spacing
        } else {
            spanCount = layoutManager!!.spanCount
            column = position % spanCount
            outRect.left = spacing * (spanCount - column) / spanCount
            outRect.right = spacing * (column + 1) / spanCount
        }
        if (position < spanCount) {
            outRect.top = spacing
        }
        outRect.bottom = spacing

}

}