RecyclerView Scroll Listener

Hi friends I will hide the header contained in the recyclerView according to the scrolling level and make it visible. But I couldn't find a listener I could use for this.
The setOnScrollChangeListener method always returns 0.0.
The addOnScrollListener method returns acceleration-sensitive dx and dy values.
I think I need to process the RecyclerView according to the alignment of the y values. Any suggestions?

 

Code (Text):

1.  
2. public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
3.  
4.     LayoutInflater inflater;
5.     ArrayList<String> list;
6.  
7.     private static final int TYPE_HEADER = 0;
8.     private static final int TYPE_LIST = 1;
9.  
10.  
11.     public RecyclerViewAdapter(Context context) {
12.         inflater = LayoutInflater.from(context);
13.         list = new ArrayList<String>();
14.         list.add("İstanbul");
15.         list.add("Ankara");
16.         list.add("Erzincan");
17.        
18.     }
19.  
20.  
21.     @Override
22.     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
23.  
24.         View view;
25.  
26.  
27.         if (viewType == TYPE_HEADER) {
28.             view = inflater.inflate(R.layout.header, parent, false);
29.             return new ViewHolder(view, viewType);
30.         } else if (viewType == TYPE_LIST) {
31.             view = inflater.inflate(R.layout.item, parent, false);
32.             return new ViewHolder(view, viewType);
33.         } else {
34.             return null;
35.         }
36.  
37.  
38.     }
39.  
40.     @Override
41.     public void onBindViewHolder(ViewHolder holder, int position) {
42.  
43.         if(holder.view_type == TYPE_LIST) {
44.  
45.             holder.txtItem.setText(list.get(--position));
46.         }
47.         else if(holder.view_type == TYPE_HEADER) {
48.  
49.         }
50.  
51.     }
52.  
53.     @Override
54.     public int getItemCount() {
55.         return list.size() + 1;
56.     }
57.  
58.  
59.     class ViewHolder extends RecyclerView.ViewHolder {
60.  
61.         TextView txtItem;
62.         int view_type;
63.  
64.         public ViewHolder(View itemView, int viewType) {
65.             super(itemView);
66.  
67.             if (viewType == TYPE_LIST) {
68.                 txtItem = (TextView) itemView.findViewById(R.id.textView);
69.                 view_type = 1;
70.             } else if (viewType == TYPE_HEADER) {
71.                 view_type = 0;
72.             }
73.  
74.  
75.         }
76.  
77.     }
78.  
79.  
80.     @Override
81.     public int getItemViewType(int position) {
82.  
83.         if (position == 0)
84.             return TYPE_HEADER;
85.         return TYPE_LIST;
86.     }
87. }
88.  

 

What I want to do; Scrolling in the form of animation with scrollTo (0, header.getHeight ()), if scrolling is left below half of the header size if scrollTo (0,0) is left below half.

 

What I want to do; Scrolling in the form of animation with scrollTo (0, header.getHeight ()), if scrolling is left below half of the header size if scrollTo (0,0) is left below half.

 

Of course. https://i.resimyukle.xyz/T84NGJ.gif

 

Yes, but in an animated way. And I just want to do it for header