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>