Github:
https://github.com/Gavin-ZYX/StickyDecoration
效果类型：
第一步：添加依赖
https://github.com/Gavin-ZYX/StickyDecoration
第二步：在mRecycler.setLayoutManager(manager)后面添加
//TODO:1确立想要浮悬的小组
GroupListener groupListener = new GroupListener() {
@Override
public String getGroupName(int position) {
//获取要悬浮的组名
return mData.get(position).getSellerName();
}
};
//TODO:2.对选中的小组进行装饰
StickyDecoration decoration = StickyDecoration.Builder
.init(groupListener)
// .setGroupBackground(R.drawable.ic_launcher_foreground)
//重置span（使用GridLayoutManager时必须调用）
//.resetSpan(mRecyclerView, (GridLayoutManager) manager)
.build();
//TODO:3添加到recyclerView
mRecycler.addItemDecoration(decoration);