带参数路径的刷新和加载

package com.baidu.zongxml;

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

import com.baidu.myutils.MyUtils;
import com.baway.adapter.MyAdapter;
import com.baway.vo.MyBooks;
import com.baway.vo.MyData;
import com.google.gson.Gson;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.GridView;

public class MainActivity extends Activity {

    private List<MyData> list_push;
    private List<MyData> list;
    private PullToRefreshGridView gv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        list_push = new ArrayList<MyData>();
        init();
    }

    private void init() {
        // 找到相应的控件
        gv = (PullToRefreshGridView) findViewById(R.id.gv);
        String yy="http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182&catalog_id=242&rn=10&rn=10";
        new MyTask().execute(0);

        gv.setOnRefreshListener(new OnRefreshListener2<GridView>() {
            // 下拉刷新加载
            public void onPullDownToRefresh(
                    PullToRefreshBase<GridView> refreshView) {
                new MyTask().execute(20);
                new MyAdapter(MainActivity.this, list_push).notifyDataSetChanged();
                gv.onRefreshComplete();
            }

            // 上拉加载跟多
            public void onPullUpToRefresh(
                    PullToRefreshBase<GridView> refreshView) {
                new MyTask2().execute(30);
                new MyAdapter(MainActivity.this, list_push).notifyDataSetChanged();
                gv.onRefreshComplete();
            }
        });

    }

    class MyTask extends AsyncTask<Integer, Integer, String> {

        @Override
        protected String doInBackground(Integer... params) {
            int str=params[0];
            String jstr=MyUtils.Check_j(str);
            return jstr;
        }

        @Override
        protected void onPostExecute(String result) {
            System.out.println(result+"========");
            Gson g=new Gson();
            MyBooks book=g.fromJson(result, MyBooks.class);
            List<MyData> list=book.getResult().getData();

            gv.setAdapter(new MyAdapter(MainActivity.this, list));
            super.onPostExecute(result);
        }

    }
    class MyTask2 extends AsyncTask<Integer, Integer, String> {

        @Override
        protected String doInBackground(Integer... params) {
            int str=params[0];
            String jstr=MyUtils.Check_j(str);
            return jstr;
        }

        @Override
        protected void onPostExecute(String result) {
            System.out.println(result+"========");
            Gson g=new Gson();
            MyBooks book=g.fromJson(result, MyBooks.class);
            list = book.getResult().getData();

            list_push.addAll(list);
            gv.setAdapter(new MyAdapter(MainActivity.this, list_push));

            super.onPostExecute(result);
        }

    }

}

//请求数据

package com.baidu.myutils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

public class MyUtils {

    //设置请求的数据路径
    public static String J_Url="http://apis.juhe.cn/goodbook/query?key=9d6ef8c31647a206e05fcaff70527182";

    public static String Check_j(int pn){
        String str="";
        StringBuffer sb=new StringBuffer(J_Url+"&catalog_id=242&pn="+pn+"&rn=20");
        try {
            URL j_url=new URL(sb.toString());

            HttpURLConnection connection=(HttpURLConnection) j_url.openConnection();
            connection.setConnectTimeout(5000);
            connection.setReadTimeout(5000);
            if(connection.getResponseCode()==200){

                BufferedReader br=new BufferedReader(new InputStreamReader(connection.getInputStream(),"utf-8") );
                str=br.readLine();
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return str;
    }

}