test

package com.itheima28.neteasedemo;

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

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.xmlpull.v1.XmlPullParser;

import com.itheima28.neteasedemo.domain.NewInfo;
import com.loopj.android.image.SmartImageView;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.util.Log;
import android.util.Xml;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

    private static final String TAG = "MainActivity";
    private final int SUCCESS = 0;
    private final int FAILED = 1;
    private ListView lvNews;
    private List<NewInfo> newInfoList;
    
    private Handler handler = new Handler() {

        /**
         * 接收消息
         */
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case SUCCESS:        // 访问成功, 有数据
                // 给Listview列表绑定数据
                
                newInfoList = (List<NewInfo>) msg.obj;

                MyAdapter adapter = new MyAdapter();
                lvNews.setAdapter(adapter);
                break;
            case FAILED:    // 无数据
                Toast.makeText(MainActivity.this, "当前网络崩溃了.", 0).show();
                break;
            default:
                break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        init();
    }

    private void init() {
        lvNews = (ListView) findViewById(R.id.lv_news);

        // 抓取新闻数据
        new Thread(new Runnable() {
            @Override
            public void run() {
                // 获得新闻集合
                List<NewInfo> newInfoList = getNewsFromInternet();
                Message msg = new Message();
                if(newInfoList != null) {
                    msg.what = SUCCESS;
                    msg.obj = newInfoList;
                } else {
                    msg.what = FAILED;
                }
                handler.sendMessage(msg);
            }
        }).start();
        
        
    }

    /**
     * 返回新闻信息
     */
    private List<NewInfo> getNewsFromInternet() {
        HttpClient client = null;
        try {
            // 定义一个客户端
            client = new DefaultHttpClient();
            
            // 定义get方法
            HttpGet get = new HttpGet("http://192.168.31.155:8080/NetEaseServer/new.xml");
            
            // 执行请求
            HttpResponse response = client.execute(get);
            
            int statusCode = response.getStatusLine().getStatusCode();
            
            if(statusCode == 200) {
                InputStream is = response.getEntity().getContent();
                List<NewInfo> newInfoList = getNewListFromInputStream(is);
                return newInfoList;
            } else {
                Log.i(TAG, "访问失败: " + statusCode);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(client != null) {
                client.getConnectionManager().shutdown();        // 关闭和释放资源
            }
        }
        return null;
    }
    
    /**
     * 从流中解析新闻集合
     * @param is
     * @return
     */
    private List<NewInfo> getNewListFromInputStream(InputStream is) throws Exception {
        XmlPullParser parser = Xml.newPullParser();    // 创建一个pull解析器
        parser.setInput(is, "utf-8");    // 指定解析流, 和编码
        
        int eventType = parser.getEventType();
        
        List<NewInfo> newInfoList = null;
        NewInfo newInfo = null;
        while(eventType != XmlPullParser.END_DOCUMENT) {    // 如果没有到结尾处, 继续循环
            
            String tagName = parser.getName();    // 节点名称
            switch (eventType) {
            case XmlPullParser.START_TAG: // <news>
                if("news".equals(tagName)) {
                    newInfoList = new ArrayList<NewInfo>();
                } else if("new".equals(tagName)) {
                    newInfo = new NewInfo();
                } else if("title".equals(tagName)) {
                    newInfo.setTitle(parser.nextText());
                } else if("detail".equals(tagName)) {
                    newInfo.setDetail(parser.nextText());
                } else if("comment".equals(tagName)) {
                    newInfo.setComment(Integer.valueOf(parser.nextText()));
                } else if("image".equals(tagName)) {
                    newInfo.setImageUrl(parser.nextText());
                }
                break;
            case XmlPullParser.END_TAG:    // </news>
                if("new".equals(tagName)) {
                    newInfoList.add(newInfo);
                }
                break;
            default:
                break;
            }
            eventType = parser.next();        // 取下一个事件类型
        }
        return newInfoList;
    }
    
    class MyAdapter extends BaseAdapter {

        /**
         * 返回列表的总长度
         */
        @Override
        public int getCount() {
            return newInfoList.size();
        }

        /**
         * 返回一个列表的子条目的布局
         */
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = null;
            
            if(convertView == null) {
                LayoutInflater inflater = getLayoutInflater();
                view = inflater.inflate(R.layout.listview_item, null);
            } else {
                view = convertView;
            }
            
            // 重新赋值, 不会产生缓存对象中原有数据保留的现象
            SmartImageView sivIcon = (SmartImageView) view.findViewById(R.id.siv_listview_item_icon);
            TextView tvTitle = (TextView) view.findViewById(R.id.tv_listview_item_title);
            TextView tvDetail = (TextView) view.findViewById(R.id.tv_listview_item_detail);
            TextView tvComment = (TextView) view.findViewById(R.id.tv_listview_item_comment);
            
            NewInfo newInfo = newInfoList.get(position);
            System.out.println(newInfo.getImageUrl());
            sivIcon.setImageUrl(newInfo.getImageUrl());        // 设置图片
            tvTitle.setText(newInfo.getTitle());
            tvDetail.setText(newInfo.getDetail());
            tvComment.setText(newInfo.getComment() + "跟帖");
            return view;
        }
        

        @Override
        public Object getItem(int position) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int position) {
            // TODO Auto-generated method stub
            return 0;
        }
    }
}