HeaderFooterAdapter.java

import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by benny on 15/10/15.
 */
public abstract class HeaderFooterAdapter<T extends RecyclerView.ViewHolder> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    public static final int FOOTER = 8769;
    public static final int HEADER = 2364;

    private View footerView;
    private View headerView;


    public void setFooterView(View footer) {

        ViewGroup vparent = (ViewGroup) footer.getParent();

        if (vparent != null) {
            vparent.removeView(footer);
        }

        this.footerView = footer;

    }

    public void setHeaderView(View header) {

        ViewGroup vparent = (ViewGroup) header.getParent();

        if (vparent != null) {
            vparent.removeView(header);
        }

        this.headerView = header;

    }

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

        if (viewType == FOOTER) {
            return new RecyclerView.ViewHolder(footerView) {
            };

        }

        if (viewType == HEADER) {
            return new RecyclerView.ViewHolder(headerView) {
            };

        }

        return onCreateItemViewHolder(parent, viewType);
    }


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

        if (getItemViewType(position) != FOOTER && getItemViewType(position) != HEADER) {
            onBindItemViewHolder((T) holder, getItemPosition(position));
        }

    }

    private int getItemPosition(int position) {

        if (headerView != null)
            return position - 1;

        return position;
    }


    @Override
    public final int getItemViewType(int position) {


        if (headerView != null && position == 0) {
            return HEADER;
        } else if (footerView != null && position == getItemCount() - 1) {
            return FOOTER;
        } else {
            return getItemsViewType(position);
        }
    }


    @Override
    public final int getItemCount() {

        int cnt = getItemsCount();

        if (headerView != null)
            cnt++;

        if (footerView != null)
            cnt++;

        return cnt;
    }

    public abstract int getItemsCount();

    protected abstract int getItemsViewType(int position);

    protected abstract T onCreateItemViewHolder(ViewGroup parent, int viewType);

    protected abstract void onBindItemViewHolder(T holder, int position);


}