A ListRecyclerAdapter (1d42afaf6e8e99d16631) with fixed-height header. Useful for that overlays a Toolbar on it for scrolling techniques.

HeaderListRecyclerAdapter.java

import android.content.Context;
import android.support.annotation.LayoutRes;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.example.netease.photo.R;

public abstract class HeaderListRecyclerAdapter<E, VH extends RecyclerView.ViewHolder>
        extends ListRecyclerAdapter<E, RecyclerView.ViewHolder> {

    public static final int VIEW_TYPE_HEADER = 0;
    public static final int VIEW_TYPE_ITEM = 1;

    public static class HeaderViewHolder extends RecyclerView.ViewHolder {
        public HeaderViewHolder(View itemView) {
            super(itemView);
        }
    }

    private final LayoutInflater inflater;

    public HeaderListRecyclerAdapter(Context context) {
        this.inflater = LayoutInflater.from(context);
    }

    protected final View inflate(@LayoutRes int layout, ViewGroup parent) {
        return inflater.inflate(layout, parent, false);
    }

    @Override
    public final int getItemViewType(int position) {
        return position == 0 ? VIEW_TYPE_HEADER : VIEW_TYPE_ITEM;
    }

    @Override
    public final int getItemCount() {
        return super.getItemCount() + 1;
    }

    public abstract VH onCreateItemViewHolder(ViewGroup parent);

    @Override
    public final RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        return viewType == VIEW_TYPE_HEADER
                ? new HeaderViewHolder(inflate(R.layout.item_toolbar_holder, parent))
                : onCreateItemViewHolder(parent);
    }

    public abstract void onBindItemViewHolder(VH holder, int position);

    @Override
    @SuppressWarnings("unchecked")
    public final void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        if (getItemViewType(position) == VIEW_TYPE_ITEM) {
            onBindItemViewHolder((VH) holder, position - 1);
        }
    }

}