使用GridLayoutManager在RecyclerView中自定义视图/行

Question

我已经使用RecyclerView成功实施了GirdLayoutManager（普通实现，没什么特别的），但现在我被卡住了，因为我想在第一个之后添加自定义视图/行3个要素。 见下图（蓝色区域）：

我怎样才能实现这一目标？有任何想法吗？谢谢！

Answer 1

设置网格布局管理器，如下所示：

final GridLayoutManager mng_layout = new GridLayoutManager(this.getActivity(), 2);

mng_layout.setSpanSizeLookup( new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                 switch( recyclerAdapter.getItemViewType(position) ) {
                    case MyRecyclerAdapter.TYPE_SINGLE:
                        return 1;
                    case MyRecyclerAdapter.TYPE_DEFAULT:
                        return 2;
                    default:
                        return -1;
                }
            }
        });
myRecyclerView.setLayoutManager(mng_layout);

然后按以下步骤更新您的RecyclerViewAdapter：

@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = null;
    if (viewType==TYPE_DEFAULT) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.product_grid_view_item, parent, false);
        return new DefaultViewHolder(view);
    } else if (viewType==TYPE_SINGLE){
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.product_grid_view_header, parent, false);
        return new SingleItemViewHolder(view);
    }
    throw new RuntimeException("There is no type that matches the type " + viewType + " + make sure your using types correctly");
}

 @Override
 public int getItemViewType(int position) {
     return (list.get(position).getType()==TYPE_DEFAULT) ? TYPE_DEFAULT : TYPE_SINGLE;
 }