RecyclerView onCreateViewHolder Return Type Incompatibility With Multiple Custom ViewHolders

Question

I\'m trying to use multiple ViewHolders in a RecyclerView in order to swap these views out at run time. I have created two classes which extend RecyclerView.ViewHolder:

Answer 1

Full working code

For those who want a full working code. There you go.

 public class YourListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

      private static final int LAYOUT_ONE= 0;
      private static final int LAYOUT_TWO= 1;

      @Override
      public int getItemViewType(int position)
      {
          if(position==0)
             return LAYOUT_ONE;
          else
             return LAYOUT_TWO;
      }

      @Override
      public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {

         View view =null;
         RecyclerView.ViewHolder viewHolder = null;

         if(viewType==LAYOUT_ONE)
         {
             view = LayoutInflater.from(parent.getContext()).inflate(R.layout.one,parent,false);
            viewHolder = new ViewHolderOne(view);
         }
         else
         {
            view = LayoutInflater.from(parent.getContext()).inflate(R.layout.two,parent,false);
            viewHolder= new ViewHolderTwo(view);
         }

        return viewHolder;

      }

      @Override
      public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {

          if(holder.getItemViewType()== LAYOUT_ONE)
          {
              // Typecast Viewholder 
              // Set Viewholder properties 
              // Add any click listener if any 
          }
          else {

              ViewHolderOne vaultItemHolder = (ViewHolderOne) holder;
              vaultItemHolder.name.setText(displayText);
              vaultItemHolder.name.setOnClickListener(new View.OnClickListener() {

                     @Override
                     public void onClick(View v) {
                      .......
                     }
                });

            }

        }

     //****************  VIEW HOLDER 1 ******************//

      public class ViewHolderOne extends RecyclerView.ViewHolder {

          public TextView name;

          public ViewHolderOne(View itemView) {
               super(itemView);
               name = (TextView)itemView.findViewById(R.id.displayName);
          }
      }


   //****************  VIEW HOLDER 2 ******************//

      public class ViewHolderTwo extends RecyclerView.ViewHolder{

          public ViewHolderTwo(View itemView) {
          super(itemView);

           ..... Do something
      }
   }
}

Read more

You can read more about creating RecyclerView with multiple ViewHolders

Answer 2

The RecyclerView.Adapter is a parameterized class that takes in a single ViewHolder type. Your definition probably looks like:

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.MenuItemViewHolder>

It should be:

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>

Don't forget to have the right definition for onBindViewHolder as well. You need to override getItemViewType as well.