Android-通过网络获取xml文件使用pull解析得到服务器中的信息(新闻客户端)

通过网络获取xml文件,使用pull解析该文件得到服务器中的信息;

demo中使用了一个开源的图片加载包,故上传源码方便查看;

源码下载地址:http://download.csdn.net/detail/u014657752/9011863

效果图:

Android-通过网络获取xml文件使用pull解析得到服务器中的信息(新闻客户端)_第1张图片


步骤:

1.连接服务器获取xml文件;

2.使用pull解析xml文件存入实体对象中;

3.解析后将实体对象存入List集合中;

4.使用BaseAdapter,将List集合中中的数据显示在listview中;

注意权限的添加;

xml布局文件:

item_listview.xml




    

    


    

    


activity_main.xml



    
    


java文件

News.java

package com.example.android07;

public class News {

	private String title;
	private String detail;
	private String comment;
	private String imageUrl;
	
	@Override
	public String toString() {
		return "News [title=" + title + ", detail=" + detail + ", comment="
				+ comment + ", imageUrl=" + imageUrl + "]";
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getDetail() {
		return detail;
	}

	public void setDetail(String detail) {
		this.detail = detail;
	}

	public String getComment() {
		return comment;
	}

	public void setComment(String comment) {
		this.comment = comment;
	}

	public String getImageUrl() {
		return imageUrl;
	}

	public void setImageUrl(String imageUrl) {
		this.imageUrl = imageUrl;
	}
}

MainActivity.java

package com.example.android07;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;

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

import com.loopj.android.image.SmartImageView;

public class MainActivity extends Activity {

	List newsList;
	ListView listView;
	Handler handler;
	MyAdapter myAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		listView = (ListView) findViewById(R.id.lisview);
		getNewsInfo();
		//创建适配器实例
		myAdapter = new MyAdapter(this);
		//创建Handler实例
		handler = new Handler() {
			@Override
			public void handleMessage(Message msg) {
				super.handleMessage(msg);
				// 要保证在设置适配器时,新闻xml文件已经解析完毕了
				// 添加适配器
				listView.setAdapter(myAdapter);
			}
		};
	}

	class MyAdapter extends BaseAdapter {

		Context context;
		LayoutInflater inflater;

		public MyAdapter(Context context) {
			this.context = context;
			inflater = LayoutInflater.from(context);
		}

		@Override
		// 得到模型层中元素的数量,用来确定listview需要有多少个条目
		public int getCount() {
			// TODO Auto-generated method stub
			return newsList.size();
		}

		@Override
		// 返回一个View对象,作为listview的条目显示至界面
		public View getView(int position, View convertView, ViewGroup parent) {
			News news = newsList.get(position);
			ViewHolder viewHolder = null;
			if (convertView == null) {
				convertView = inflater.inflate(R.layout.item_listview, null);
				viewHolder = new ViewHolder();
				// 把布局文件中所有组件的对象封装至ViewHolder对象中
				viewHolder.St_image = (SmartImageView) convertView
						.findViewById(R.id.image);
				viewHolder.tv_title = (TextView) convertView
						.findViewById(R.id.tv_title);
				viewHolder.tv_detail = (TextView) convertView
						.findViewById(R.id.tv_detail);
				viewHolder.tv_commen = (TextView) convertView
						.findViewById(R.id.tv_comment);
				convertView.setTag(viewHolder);
			} else {
				viewHolder = (ViewHolder) convertView.getTag();
			}

			// 给新闻图片imageview设置内容
			viewHolder.St_image.setImageUrl(news.getImageUrl());
			// 给三个文本框设置内容
			viewHolder.tv_title.setText(news.getTitle());
			viewHolder.tv_detail.setText(news.getDetail());
			viewHolder.tv_commen.setText(news.getComment());
			//返回填充的布局item_listview
			return convertView;
		}

		@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;
		}

		class ViewHolder {
			//条目的布局文件中有什么组件,这里就定义什么属性
			private SmartImageView St_image;
			private TextView tv_title;
			private TextView tv_detail;
			private TextView tv_commen;
		}

	}

	private void getNewsInfo() {
		Thread thread = new Thread() {
			@Override
			public void run() {
				super.run();
				Log.v("tag", "1111111111");
				String path = "http://192.168.47.25:8080/mytest/news.xml";
				try {
					URL url = new URL(path);
					HttpURLConnection conn = (HttpURLConnection) url
							.openConnection();
					conn.setRequestMethod("GET");
					conn.setConnectTimeout(5000);
					conn.setReadTimeout(5000);
//					conn.connect();
					//发送http GET请求,获取相应码
					if (conn.getResponseCode() == 200) {
						InputStream is = conn.getInputStream();
						//使用pull解析器,解析这个流
						parseNewsXml(is);
					}

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

			}

		};
		thread.start();
	}

	private void parseNewsXml(InputStream is) {
		XmlPullParser xp = Xml.newPullParser();
		try {
			xp.setInput(is, "utf-8");
			//对节点的事件类型进行判断,就可以知道当前节点是什么节点
			int type = xp.getEventType();
			News news = null;
			while (type != XmlPullParser.END_DOCUMENT) {
				switch (type) {
				case XmlPullParser.START_TAG:
					if ("newslist".equals(xp.getName())) {
						newsList = new ArrayList<>();
					} else if ("news".equals(xp.getName())) {
						news = new News();
					} else if ("title".equals(xp.getName())) {
						String title = xp.nextText();
						news.setTitle(title);
					} else if ("detail".equals(xp.getName())) {
						String detail = xp.nextText();
						news.setDetail(detail);
					} else if ("comment".equals(xp.getName())) {
						String comment = xp.nextText();
						news.setComment(comment);
					} else if ("image".equals(xp.getName())) {
						String image = xp.nextText();
						news.setImageUrl(image);
					}
					break;
				case XmlPullParser.END_TAG:
					if ("news".equals(xp.getName())) {
						newsList.add(news);
					}
					break;
				default:
					break;
				}
				//解析完当前节点后,把指针移动至下一个节点,并返回它的事件类型
				type = xp.next();
			}
			// 发消息,让主线程设置listview的适配器,如果消息不需要携带数据,可以发送空消息
			handler.sendEmptyMessage(1);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

}

服务器端中news. xml的文件代码:



	
		新闻一
		新闻一内容
		15687
		http://192.168.47.25:8080/mytest/images/1.jpg
	
	
		新闻二
		新闻二内容
		16359
		http://192.168.47.25:8080/mytest/images/2.jpg
	
	
		新闻三
		新闻三内容
		14112
		http://192.168.47.25:8080/mytest/images/3.jpg
	
	
		新闻四
		新闻四内容
		6427
		http://192.168.47.25:8080/mytest/images/4.jpg
	
	
		新闻五
		新闻五内容
		681
		http://192.168.47.25:8080/mytest/images/5.jpg
	





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