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   源码介绍

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package com.example.android_json;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ListView;
import android.widget.Toast;

import com.example.android_json.Json.HttpJson;
import com.example.android_json.adapter.News_Adapter;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshBase.OnRefreshListener2;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;
import com.lidroid.xutils.http.client.HttpRequest.HttpMethod;

public class MainActivity extends Activity {
	private HttpUtils http=null;
	private List<Map<String, Object>> news_list=new ArrayList<Map<String,Object>>();
	private ListView list;
	public PullToRefreshListView pulllist;
	private News_Adapter adapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		init();
		loadinit();
		pulltolist();
	}
	public void initAdapter(){
		adapter=new News_Adapter(this);
		adapter.setList(news_list);
		list.setAdapter(adapter);
	}
	private void init(){
		pulllist=(PullToRefreshListView) findViewById(R.id.list);
//		list=(ListView) findViewById(R.id.list);
		list=pulllist.getRefreshableView();
	}
	private void  pulltolist(){
		pulllist.setOnRefreshListener(new OnRefreshListener2<ListView>() {
			@Override
			public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "下拉刷新!", Toast.LENGTH_SHORT).show();
				pulllist.onRefreshComplete();
			}
			@Override
			public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "上拉刷新!", Toast.LENGTH_SHORT).show();
				refresh(HttpJson.more);
			}
		});
	}
	private void loadinit(){
		http=new HttpUtils();
		String url="http://zhbj.qianlong.com/static/api/news/10006/list_1.json";
		http.send(HttpMethod.GET, url,new RequestCallBack<String>() {
			@Override
			public void onFailure(HttpException arg0, String arg1) {
				// TODO Auto-generated method stub
				handler.sendEmptyMessage(-1);
			}
			@Override
			public void onSuccess(ResponseInfo<String> arg0) {
				// TODO Auto-generated method stub
				String str=arg0.result;
				Message msg=handler.obtainMessage();
				getdate(HttpJson.getnews(str));
				msg.what=1;
				handler.sendMessage(msg);
			}
		});
	}
	//上拉刷新
	private void refresh(String url){
		http=new HttpUtils();
		http.send(HttpMethod.GET, url,new RequestCallBack<String>() {
			@Override
			public void onFailure(HttpException arg0, String arg1) {
				// TODO Auto-generated method stub
				handler.sendEmptyMessage(-1);
			}
			@Override
			public void onSuccess(ResponseInfo<String> arg0) {
				// TODO Auto-generated method stub
				String str=arg0.result;
				Message msg=handler.obtainMessage();
				getdate(HttpJson.getnews(str));
				msg.what=2;
				handler.sendMessage(msg);
			}
		});
	}
	Handler handler=new Handler(){
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case -1:
				Toast.makeText(MainActivity.this, "网络连接失败！", Toast.LENGTH_LONG).show();
				break;
			case 1:
				initAdapter();
				break;
			case 2:
				adapter.notifyDataSetChanged();
				pulllist.onRefreshComplete();
				break;
			}
		};
	};
	public void getdate(List<Map<String, Object>> list){
	    for (int i = 0; i <list.size(); i  ) {
	    	Map<String, Object> map=list.get(i);
	    	news_list.add(map);
		}	
	}
}