xml 上拉下拉 核心代码

package com.example.xml_shangxia;

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

import android.app.Activity;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.format.DateUtils;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.example.adapter.MyBaseAdapter;
import com.example.net.NetWorkUtils;
import com.example.vo.MyDatas;
import com.example.vo.MyNews;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnLastItemVisibleListener;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.thoughtworks.xstream.XStream;

public class MainActivity extends Activity{
    private ArrayList<MyNews>list=new ArrayList<MyNews>();
    private ArrayList<MyNews>list1=new ArrayList<MyNews>();
    int i=1;
    private MyBaseAdapter adapter;
    private PullToRefreshListView mPullRefreshListView;
    private boolean boo=true;
    private String JSON="http://www.oschina.net/action/api/news_list?catalog=1&pageIndex=1";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        new MyAsyncTask().execute(JSON);
    }
    private void init() {
        // TODO Auto-generated method stub
        //mylist=(ListView) findViewById(R.id.mylist);
        mPullRefreshListView = (PullToRefreshListView) findViewById(R.id.pull_refresh_list);

        // Set a listener to be invoked when the list should be refreshed.
        mPullRefreshListView.setOnRefreshListener(new OnRefreshListener<ListView>() {
            @Override
            public void onRefresh(PullToRefreshBase<ListView> refreshView) {
                String label = DateUtils.formatDateTime(getApplicationContext(), System.currentTimeMillis(),
                        DateUtils.FORMAT_SHOW_TIME | DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_ABBREV_ALL);

                // Update the LastUpdatedLabel
                refreshView.getLoadingLayoutProxy().setLastUpdatedLabel(label);

                // Do work to refresh the list here.
                new MyAsyncTask().execute(JSON+i++);
            }
        });

        // Add an end-of-list listener
        mPullRefreshListView.setOnLastItemVisibleListener(new OnLastItemVisibleListener() {

            @Override
            public void onLastItemVisible() {
                Toast.makeText(MainActivity.this, "到底了!加载更多", Toast.LENGTH_SHORT).show();
                new MyAsyncTask().execute(JSON+i++);
            }
        });
    }
    class MyAsyncTask extends AsyncTask<String, Integer, String>{

        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            String url=params[0];
            String str=NetWorkUtils.newsList(url);
            return str;
        }
        @Override
        protected void onPostExecute(String result) {
            // TODO Auto-generated method stub
            if(boo=true){
                XStream stream=new XStream();
                stream.processAnnotations(MyDatas.class);
                MyDatas my=(MyDatas) stream.fromXML(result);
                list=(ArrayList<MyNews>) my.getNewslist().getNews();
                list1=list;
                adapter=new MyBaseAdapter(MainActivity.this, list1);
                mPullRefreshListView.setAdapter(adapter);
                adapter.notifyDataSetChanged();
                mPullRefreshListView.onRefreshComplete();
            }else{
                XStream stream=new XStream();
                stream.processAnnotations(MyDatas.class);
                MyDatas my=(MyDatas) stream.fromXML(result);
                list=(ArrayList<MyNews>) my.getNewslist().getNews();
                list1.addAll(list);
                adapter.notifyDataSetChanged();
                mPullRefreshListView.onRefreshComplete();
            }
            super.onPostExecute(result);
            mPullRefreshListView.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                        long arg3) {
                    // TODO Auto-generated method stub
                    Intent it=new Intent(MainActivity.this,InfoActivity.class);
                    it.putExtra("title", list.get(arg2-1).getTitle());
                    it.putExtra("body", list.get(arg2-1).getBody());
                    System.out.println("intent=========="+it);
                    startActivity(it);
                }
            });
        }
    }

}