上拉加载，下拉刷新以及集合堆叠效果

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package com.baway.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import com.baway.test.bean.Book;
import com.baway.test.bean.MyData;
import com.baway.test.bean.Reasultt;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.GridView;

public class TwoActivity extends Activity {

   private String id;
   private PullToRefreshGridView gv;
   private List<Book> data;
   private Handler handler=new Handler(){
       public void handleMessage(Message msg) {

               List<Book> book_list=(List<Book>) msg.obj;

               for(Book b:book_list){
                   list_list.addAll(book_list);
               }

                adapter.notifyDataSetChanged();
                gv.onRefreshComplete();

       };
   };
   private List<Book> list_list;
   private MyGvAdapter adapter;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);

       //加载布局
       setContentView(R.layout.activity_two);

       list_list = new ArrayList<>();


       //获得传过来的值
       Intent intent = getIntent();
       id = intent.getStringExtra("id");

       initData();

       adapter = new MyGvAdapter(TwoActivity.this,list_list);

       gv = (PullToRefreshGridView) findViewById(R.id.two_gv);
       gv.setMode(Mode.BOTH);
          gv.setAdapter(adapter);
       gv.setOnRefreshListener(new OnRefreshListener2<GridView>() {

           @Override
           public void onPullDownToRefresh(
                   PullToRefreshBase<GridView> refreshView) {
               // TODO Auto-generated method stub
               initData();

           }

           @Override
           public void onPullUpToRefresh(
                   PullToRefreshBase<GridView> refreshView) {
               // TODO Auto-generated method stub
               initData();
           }
       });
   }

   //请求数据
   private void initData() {
       // TODO Auto-generated method stub
       new Thread(){


           public void run() {
               try {
                   HttpClient client=new DefaultHttpClient();
                   HttpGet get=new HttpGet("http://apis.juhe.cn/goodbook/query?key=d82140229634dacc6a1908e65c767d76&catalog_id="+id+"&rn=10");
                   HttpResponse response = client.execute(get);
                   HttpEntity entity = response.getEntity();
                   String content = EntityUtils.toString(entity, "utf-8");

                   Gson gson=new Gson();
                   MyData fromJson = gson.fromJson(content, MyData.class);
                   Reasultt result = fromJson.getResult();
                   data = result.getData();

                   Message msg=Message.obtain();
                   msg.obj=data;

                   handler.sendMessage(msg);

               } catch (ClientProtocolException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               } catch (IOException e) {
                   // TODO Auto-generated catch block
                   e.printStackTrace();
               }

           };
       }.start();

   }
}

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