使用 gridlayout manager 将标题视图添加到 recyclerview

要使用 gridlayout 向 Recyclerview 添加标题，首先需要告知适配器标题视图是第一个位置 - 而不是用于内容的标准单元格。接下来，必须告诉布局管理器第一个位置的跨度应该等于整个列表的* span 计数。 *

定期使用 RecyclerView.Adapter 类并按如下方式对其进行配置：

public class HeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    private static final int ITEM_VIEW_TYPE_HEADER = 0;
    private static final int ITEM_VIEW_TYPE_ITEM = 1;

    private List<YourModel> mModelList;

    public HeaderAdapter (List<YourModel> modelList) {
        mModelList = modelList;
    }

    public boolean isHeader(int position) {
        return position == 0;
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        LayoutInflater inflater = LayoutInflater.from(parent.getContext());

        if (viewType == ITEM_VIEW_TYPE_HEADER) {
            View headerView = inflater.inflate(R.layout.header, parent, false);
            return new HeaderHolder(headerView);
        }

        View cellView = inflater.inflate(R.layout.gridcell, parent, false);
        return new ModelHolder(cellView);
    }

    @Override
    public int getItemViewType(int position) {
        return isHeader(position) ? ITEM_VIEW_TYPE_HEADER : ITEM_VIEW_TYPE_ITEM;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder h, int position) {
        if (isHeader(position)) {
            return;
        }

        final YourModel model = mModelList.get(position -1 ); // Subtract 1 for header

        ModelHolder holder = (ModelHolder) h;
        // populate your holder with data from your model as usual
    }

    @Override
    public int getItemCount() {
        return _categories.size() + 1; // add one for the header
    }
}

然后在 activity / fragment 中：

final HeaderAdapter adapter = new HeaderAdapter (mModelList);
final GridLayoutManager manager = new GridLayoutManager(); 
manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
    @Override
    public int getSpanSize(int position) {
        return adapter.isHeader(position) ? manager.getSpanCount() : 1;
    }
});
mRecyclerView.setLayoutManager(manager);
mRecyclerView.setAdapter(adapter);

除了标题之外或者代替标题，可以使用相同的方法添加页脚。

资料来源： Chiu-Ki Chan 的 Square Island 博客