Step 1: override getItemViewType() method in adapter; add setType(int type) method

1. //Use this method to set type when clicking switch layout  
2. public void setType(int type) {  
3.     this.type = type;  
4. }  
5.   
6. @Override  
7. //Which type of layout is used to get the current Item  
8. public int getItemViewType(int position) {  
9.     return type;  
10. }  

Step 2: three steps when clicking layout to switch pictures

1. if (goodsType==0){  
2.     ivGoodsType.setImageResource(R.mipmap.good_type_grid);  
3.     //1: Set layout type  
4.     adapter.setType(1);  
5.     //2: Set the corresponding layout manager  
6.     recyclerView.setLayoutManager(new GridLayoutManager(context,2));  
7.     //3: Refresh adapter  
8.     adapter.notifyDataSetChanged();  
9.     goodsType=1;  
10. }else {  
11.     ivGoodsType.setImageResource(R.mipmap.good_type_linear);  
12.     adapter.setType(0);  
13.     recyclerView.setLayoutManager(new LinearLayoutManager(context));  
14.     adapter.notifyDataSetChanged();  
15.     goodsType=0;  
16. }  

Step 3: in the onCreateViewHolder() method of adapter, switch the item layout according to the layout type you set

1. public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {  
2.     View baseView;  
3.     if (viewType == 0) {  
4.         baseView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_listview_goods_list, parent, false);  
5.         LinearViewHolder linearViewHolder = new LinearViewHolder(baseView);  
6.         return linearViewHolder;  
7.     } else {  
8.         baseView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_gridview_goods_list, parent, false);  
9.         GridViewHolder gridViewHolder = new GridViewHolder(baseView);  
10.         return gridViewHolder;  
11.     }  
12. }  

Next, we will know that the top picture appears at the bottom sliding position, and click the picture to realize the top function of RecyclerView;

The top picture is not always displayed on the screen, but can only be displayed by sliding to a certain distance through monitoring; we need to rewrite the sliding monitoring of RecyclerView;

1. //Set sliding monitor  
2.         recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {  
3.             @Override  
4.             public void onScrolled(RecyclerView recyclerView, int dx, int dy) {  
5.                 super.onScrolled(recyclerView, dx, dy);  
6.                 RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();  
7.                 if (layoutManager instanceof LinearLayoutManager) {  
8.                     LinearLayoutManager linearManager = (LinearLayoutManager) layoutManager;  
9.                     //Get the first visible location  
10.                     int firstVisibleItemPosition = linearManager.findFirstVisibleItemPosition();  
11.                     //Show top icons when sliding to more than 10  
12.                     if (firstVisibleItemPosition>10) {  
13.                         ivStick.setVisibility(View.VISIBLE);  
14.                     }else {  
15.                         ivStick.setVisibility(View.GONE);  
16.                     }  
17.                 }  
18.             }  
19.         });