Access Adapter Items In GridLayoutManager.SpanSizeLookup & GetSpanSize

Question

I have a RecyclerView that uses a GridLayoutManager, and I want to center the items in the last row. Based on what I have found, this is done by creating a GridLayoutManager.SpanSizeLookup & overriding GetSpanSize. I believe I understand how to do this, except for the fact that I need access to the Adapter (or at least the item count & the SpanCount set for the GridLayoutManager) in order to calculate the value. Is there a way to access this information from a SpanSizeLookup (without passing in extra variable)? How can I access the span size using only the position?

Answer 1

Hello,​

Is there a way to access this information from a SpanSizeLookup (without passing in extra variable)? How can I access the span size using only the position?

I cannot find this Api that get adapter Items in the GridLayoutManager.SpanSizeLookup without passing variable and getSpanSize.

We use myAdapter.GetItemViewType(position) to get items normally.

   internal class MySpanSizeLookup : GridLayoutManager.SpanSizeLookup  
       {  
           private MyAdapter myAdapter;  
     
           public MySpanSizeLookup(MyAdapter myAdapter)  
           {  
               this.myAdapter = myAdapter;  
           }  
     
           public override int GetSpanSize(int position)  
           {  
               switch (myAdapter.GetItemViewType(position))  
               {  
                   case MyAdapter.HEADER:  
                       return 1;  
                   case MyAdapter.ITEM:  
                       return 2;  
                   default:  
                       return -1;  
               }  
     
               
           }  
       }  

Best Regards,

Leon Lu

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