练习使用XRecyclerView，可上拉下拉刷新。

 package com.lixu.testxrecyclerview;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.support.v7.widget.StaggeredGridLayoutManager;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Toast;
 import com.jcodecraeer.xrecyclerview.XRecyclerView;

 public class MainActivity extends AppCompatActivity {
     private XRecyclerView mXRecyclerView;

     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         int[] imgs = {R.drawable.img1, R.drawable.img2, R.drawable.img3, R.drawable.img4, R.drawable.img5, R.drawable.img6, R.drawable.img7, R.drawable.img8, R.drawable.img9, R.drawable.img10,
                 R.drawable.img11, R.drawable.img12, R.drawable.img13, R.drawable.img14, R.drawable.img15, R.drawable.img16, R.drawable.img17, R.drawable.img18, R.drawable.img19, R.drawable.img20,
                 R.drawable.meinv1, R.drawable.meinv2, R.drawable.meinv3, R.drawable.meinv4, R.drawable.meinv5, R.drawable.meinv6, R.drawable.meinv7, R.drawable.meinv8, R.drawable.meinv9, R.drawable.meinv10,
                 R.drawable.meinv11, R.drawable.meinv12, R.drawable.meinv13, R.drawable.meinv14, R.drawable.meinv15, R.drawable.meinv16, R.drawable.meinv17, R.drawable.meinv18, R.drawable.meinv19, R.drawable.meinv20,
         };

         mXRecyclerView = (XRecyclerView) findViewById(R.id.xrecyclerview);
         //新建瀑布流的布局
         StaggeredGridLayoutManager sgm = new StaggeredGridLayoutManager(2, StaggeredGridLayoutManager.VERTICAL);
         //设置滑动方向
         sgm.setOrientation(StaggeredGridLayoutManager.HORIZONTAL);
         //设置布局
         mXRecyclerView.setLayoutManager(sgm);
         mXRecyclerView.setPullRefreshEnabled(true);
         MyAdapter myAdapter= new MyAdapter(imgs,this);
         mXRecyclerView.setAdapter(myAdapter);
         //设置点击事件
         myAdapter.setOnItemClickLitener(new MyAdapter.OnItemClickLitener() {
             @Override
             public void onitemclick(View view, int pos) {
                 Toast.makeText(getApplicationContext(),"第"+pos+"被点击",Toast.LENGTH_SHORT).show();
             }

             @Override
             public void onitemlongclick(View view, int pos) {
                 Toast.makeText(getApplicationContext(),"第"+pos+"被长按",Toast.LENGTH_SHORT).show();
             }
         });
         //添加头部
         View header = LayoutInflater.from(this).inflate(R.layout.header, (ViewGroup) findViewById(android.R.id.content), false);
         mXRecyclerView.addHeaderView(header);
         //设置 上拉下拉刷新监听器
         mXRecyclerView.setLoadingListener(new XRecyclerView.LoadingListener() {

             @Override
             public void onRefresh() {
                 mXRecyclerView.refreshComplete();
             }

             @Override
             public void onLoadMore() {
                 mXRecyclerView.loadMoreComplete();
             }
         });

     }

 }

 package com.lixu.testxrecyclerview;

 import android.content.Context;
 import android.graphics.BitmapFactory;
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;

 import com.jcodecraeer.xrecyclerview.XRecyclerView;

 /**
  * Created by lixu on 2016/3/19.
  */
 class MyAdapter extends XRecyclerView.Adapter<MyAdapter.Myholder> {
     private int[] data;
     private Context context;
     private BitmapFactory.Options otp;

     public MyAdapter(int[] imgs, Context c) {
         context = c;
         data = imgs;
         otp = new BitmapFactory.Options();
     }

     @Override
     public Myholder onCreateViewHolder(ViewGroup parent, int viewType) {

         View view = View.inflate(context, R.layout.item_list, null);

         return new Myholder(view);
     }

     //设置回调接口
     interface OnItemClickLitener {

         void onitemclick(View view, int pos);

         void onitemlongclick(View view, int pos);

     }

     private OnItemClickLitener onItemClickLitener;

     public void setOnItemClickLitener(OnItemClickLitener onItemClickLitener) {
         this.onItemClickLitener = onItemClickLitener;
     }

     @Override
     public void onBindViewHolder(final Myholder holder, int position) {
         //将本地图片改成bitmap图片
         holder.iv.setImageBitmap(BitmapFactory.decodeStream(context.getResources().openRawResource(data[position]), null, otp));
         // holder.iv.setImageResource(data[position]);
         //设置点击事件
         holder.iv.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 int pos = holder.getLayoutPosition();
                 onItemClickLitener.onitemclick(holder.iv, pos);
             }
         });
         //设置长按点击事件
         holder.iv.setOnLongClickListener(new View.OnLongClickListener() {
             @Override
             public boolean onLongClick(View v) {
                 int pos = holder.getLayoutPosition();
                 onItemClickLitener.onitemlongclick(holder.iv, pos);
                 return false;
             }
         });

     }

     @Override
     public int getItemCount() {

         return data.length;
     }

     public class Myholder extends RecyclerView.ViewHolder {
         private ImageView iv;

         public Myholder(View itemView) {
             super(itemView);
             iv = (ImageView) itemView.findViewById(R.id.iv);
         }
     }
 }

xml：

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context="com.lixu.testxrecyclerview.MainActivity">

    <com.jcodecraeer.xrecyclerview.XRecyclerView
        android:id="@+id/xrecyclerview"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></com.jcodecraeer.xrecyclerview.XRecyclerView>
 </RelativeLayout>

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">

     <ImageView
         android:id="@+id/header"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:src="@drawable/meinv5"/>
 </LinearLayout>

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     xmlns:cardview="http://schemas.android.com/apk/res-auto"
     android:orientation="vertical"
     android:padding="5dp">

     <android.support.v7.widget.CardView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         cardview:cardElevation="3dp">

         <ImageView
             android:id="@+id/iv"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:padding="2dp"
             android:src="@mipmap/ic_launcher" />

     </android.support.v7.widget.CardView>

 </LinearLayout>