RecyclerView：带header和footer的grid

import java.util.ArrayList;
import java.util.List;

import com.example.test.R;
import com.widget.view.HeaderFooterAdapter.ViewHolder;

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

/**
 * 为了用RecyclerView创建一个带header的grid：

	1,定义一个具有两种view类型的adapter，一个为header一个为普通item。
	
	2,inflate一个header，把它传递给adapter。
	
	3,重写GridLayoutManager中的setSpanSizeLookup，在header所处的位置返回和span count（列数）相等的 span size。
 * @author Administrator
 *
 */
public class HeaderFooterAdapter extends RecyclerView.Adapter {

	private static final int ITEM_VIEW_TYPE_HEADER = 0;
	private static final int ITEM_VIEW_TYPE_ITEM = 1;
	private static final int ITEM_VIEW_TYPE_FOOTER = 2;

	private final View header;
	private final View footer;
	private final List labels;

	private int headerCount=0;
	private int footerCount=0;
	public HeaderFooterAdapter(View header, View footer,int count) {
		headerCount=header == null?0:1;
		footerCount=footer == null?0:1;
		
		this.header = header;
		this.footer = footer;
		this.labels = new ArrayList(count);
		for (int i = 0; i 

View header = LayoutInflater.from(this).inflate(R.layout.header_view, recyclerView, false);
        	View footer = LayoutInflater.from(this).inflate(R.layout.footer_view, recyclerView, false);
			final HeaderFooterAdapter adapter = new HeaderFooterAdapter(header,footer, 30);
			adapter.setOnItemClickLitener(new HeaderFooterAdapter.OnItemClickLitener() {
				
				@Override
				public void onItemClick(View view, int position) {
					// TODO Auto-generated method stub
					if(adapter.isHeader(position)){
						Toast.makeText(context, "header clicked", Toast.LENGTH_SHORT).show();
					}else if(adapter.isFooter(position)){
						Toast.makeText(context, "footer clicked", Toast.LENGTH_SHORT).show();
					}else{
						Toast.makeText(context, "header item "+position, Toast.LENGTH_SHORT).show();
					}
				}
			});
			
        	final GridLayoutManager manager = new GridLayoutManager(this, 3);
        	manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
				@Override
				public int getSpanSize(int position) {
					if(adapter.isHeader(position)||adapter.isFooter(position)){
						return manager.getSpanCount();
					}
					return  1;
				}
			});
        	recyclerView.setLayoutManager(manager);
		recyclerView.setAdapter(adapter);