使用 SpanSizeLookup 为 GridLayoutManager 中的项目设置跨度 [英] Set span for items in GridLayoutManager using SpanSizeLookup

问题描述

我想用节标题实现类似网格的布局.想想 https://github.com/TonicArtos/StickyGridHeaders

I want to implement grid-like layout with section headers. Think of https://github.com/TonicArtos/StickyGridHeaders

我现在在做什么:

mRecyclerView = (RecyclerView) view.findViewById(R.id.grid);
mLayoutManager = new GridLayoutManager(getActivity(), 2);
mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                switch(mAdapter.getItemViewType(position)){
                    case MyAdapter.TYPE_HEADER:
                        return 1;
                    case MyAdapter.TYPE_ITEM:
                        return 2;
                    default:
                        return -1;
                }
            }
        });

mRecyclerView.setLayoutManager(mLayoutManager);

现在常规项目和标题的跨度大小均为 1.我该如何解决这个问题?

Now both regular items and headers have span size of 1. How do I solve this?

推荐答案

问题是 header 的 span size 应该是 2，常规 item 的 span size 应该是 1.所以正确的实现是:

The problem was that header should have span size of 2, and regular item should have span size of 1. So correct implementations is:

mLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                switch(mAdapter.getItemViewType(position)){
                    case MyAdapter.TYPE_HEADER:
                        return 2;
                    case MyAdapter.TYPE_ITEM:
                        return 1;
                    default:
                        return -1;
                }
            }
        });

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