RecycleView嵌套RecycleView问题集

1.问题：子RecycleView网格布局的话，使用GridSpacingItemDecoration控制间隔大小，不断上下滑动，部分间距会不断变大，超出界面
原因：未知
解决方法：
方法1.亲测有效

 if (holder.rlv_select.getItemDecorationCount() == 0) {
            GridSpacingItemDecoration gridSpacingItemDecoration=new GridSpacingItemDecoration(4, DisplayUtils.dp2px(context,33), DisplayUtils.dp2px(context,10),false);
            holder.rlv_select.addItemDecoration(gridSpacingItemDecoration);
        }

方法2.

recyclerView.removeItemDecoration();

public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {

    private int spanCount;
    private int spacing;
    private int topSpaceing;
    private boolean includeEdge;

    public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
        this.spanCount = spanCount;
        this.spacing = spacing;
        this.includeEdge = includeEdge;
    }

    public GridSpacingItemDecoration(int spanCount, int spacing,int topSpaceing, boolean includeEdge) {
        this.spanCount = spanCount;
        this.spacing = spacing;
        this.includeEdge = includeEdge;
        this.topSpaceing = topSpaceing;
    }

    @Override
    public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
        int position = parent.getChildAdapterPosition(view); // item position
        int column = position % spanCount; // item column

        if (includeEdge) {
            outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)
            outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)

            if (position < spanCount) { // top edge
                outRect.top = spacing;
            }
            outRect.bottom = spacing; // item bottom
        } else {
            outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)
            outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f /    spanCount) * spacing)
            if (position >= spanCount) {
                outRect.top = topSpaceing; // item top
            }
        }
    }
}

参考：RecyclerView刷新ItemDecorations间距不断增加问题的处理