Question

我正在使用带有2个单元格的GridLayoutManager，对于某些单元格，我希望span为1，所以我尝试使用setSpanSizeLookup，但它不起作用。我尝试为所有位置返回跨度计数1，但仍然出现两个单元格而不是一个。

以下是我的代码

Name

为什么它不能正常工作？

Answer 1

替换

return 1;

到

return 2;

这表明你正在将2个细胞分成1个细胞。

<强>代码

这是我为特定位置扫描2个单元格的代码

GridLayoutManager glm=new GridLayoutManager(mContext,2);
glm.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            switch(categoryAdapter.getItemViewType(position)) {
                case 1:
                    return 2;
                default:
                    return 1;
            }
        }
    });
    mRecyclerViewCategory.setLayoutManager(glm);

如何在 Recycler Adapter

中定义案例范围

@Override
public int getItemViewType(int position) {
    if(position==[your_specific_postion_where_to_span]){
        return 1;
    }
    return super.getItemViewType(position);
}

Answer 2

我为此努力，因为此时的文档很差。我这样想出来......

getSpanSize和getSpanIndex似乎一起工作。对我来说，我试图在gridlayoutManager中插入一个pageViewer来生成两列。所以定义如下：mGridLayout = new GridLayoutManager(getActivity(), 2);

//must be called before setLayoutManager is invoked
private void setNumOfColumnsForPageViewer(final FallCollectionRecyclerAdapter adapter) {

    mGridLayout.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
        @Override
        public int getSpanSize(int position) {
            if (adapter.getItemViewType(position) == MyRecyclerAdapter.TYPE_PAGE_VIEWER)
                return 2; //some other form of item like a header, or whatever you need two spans for
            else
                return 1; //normal item which will take up the normal span you defined in the gridlayoutmanager constructor
        }

        @Override
        public int getSpanIndex(int position, int spanCount) {
            if (adapter.getItemViewType(position) == FallCollectionRecyclerAdapter.TYPE_PAGE_VIEWER)
                return 1;//use a single span
            else
                return 2; //use two spans
        }
    });

    mRecyclerView.setLayoutManager(mGridLayout);
}

GridLayoutManager setSpanSizeLookup不起作用

2 个答案: