new.xml
<?xml version="1.0" encoding="UTF-8" ?> <newslist><news><title>黑马52期就业快报</title><detail>热烈祝贺黑马52期平均薪水突破13k</detail><comment>15687</comment><image>http://192.168.1.100:8080/images/6.jpg</image></news><news><title>程序员因写代码太乱被杀害</title><detail>凶手是死者同事，维护死者代码时完全看不懂而痛下杀手</detail><comment>16359</comment><image>http://192.168.1.100:8080/images/7.jpg</image></news><news><title>产品经理因频繁改需求被杀害</title><detail>凶手是一名程序员，因死者对项目需求频繁改动而痛下杀手</detail><comment>14112</comment><image>http://192.168.1.100:8080/images/7.jpg</image></news><news><title>3Q大战宣判: 腾讯获赔500万</title><detail>最高法驳回360上诉, 维持一审宣判.</detail><comment>6427</comment><image>http://192.168.1.100:8080/images/1.jpg</image></news><news><title>今日之声:北大雕塑被戴口罩</title><detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail><comment>681</comment><image>http://192.168.1.100:8080/images/2.jpg</image></news><news><title>奥巴马见是装蒜</title><detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail><comment>1359</comment><image>http://192.168.1.100:8080/images/3.jpg</image></news><news><title>轻松一刻: 我要沉迷学习不自拔</title><detail>放假时我醒了不代表我起床了, 如今我起床了不代表我醒了!</detail><comment>11616</comment><image>http://192.168.1.100:8080/images/4.jpg</image></news><news><title>男女那些事儿</title><detail>"妈, 我在东莞被抓, 要2万保释金, 快汇钱到xxx!"</detail><comment>10339</comment><image>http://192.168.1.100:8080/images/5.jpg</image></news><news><title>赵帅哥语录一</title><detail>少壮不努力，老大做IT</detail><comment>14612</comment><image>http://192.168.1.100:8080/images/8.jpg</image></news><news><title>赵帅哥语录二</title><detail>问君能有几多愁，恰似调完代码改需求</detail><comment>13230</comment><image>http://192.168.1.100:8080/images/8.jpg</image></news><news><title>赵帅哥语录三</title><detail>觉得我帅的人工资一般都比较高</detail><comment>9928</comment><image>http://192.168.1.100:8080/images/8.jpg</image></news><news><title>今日之声:北大雕塑被戴口罩</title><detail>市民: 因雾霾起诉环保局; 公务员谈"紧日子": 坚决不出去.</detail><comment>681</comment><image>http://192.168.1.100:8080/images/2.jpg</image></news><news><title>奥巴马见是装蒜</title><detail>外文局: 国际民众认可中国大国地位;法院: "流量清零"未侵权.</detail><comment>1359</comment><image>http://192.168.1.100:8080/images/3.jpg</image></news> </newslist>
主页面：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity" ><ListView android:id="@+id/lv"android:layout_width="match_parent"android:layout_height="match_parent"></ListView></RelativeLayout>
条目：
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="wrap_content" ><com.loopj.android.image.SmartImageView android:id="@+id/iv"android:layout_width="90dp"android:layout_height="70dp"android:src="@drawable/ic_launcher"android:layout_centerVertical="true" 竖直居中/><TextView android:id="@+id/tv_title"android:layout_width="match_parent"android:layout_height="wrap_content" 和包裹内容一样，就是和里面的内容一样android:text="这是大标题志哥教你上塑料adasfsadfdsfdsgsd"android:layout_toRightOf="@id/iv" 右边android:textSize="22sp"android:singleLine="true" 标题不要换行，多余部分用...显示/><TextView android:id="@+id/tv_detail"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="这是正文志哥教你带崩三路adasfsadasdasdasdasidhsakjhdkjashdkjahskjdhsakjdfdsfdsgsd"android:layout_toRightOf="@id/iv"android:layout_below="@id/tv_title"android:textSize="15sp"android:textColor="@android:color/darker_gray"android:lines="2" 只能显示2行，多余用...显示 /><TextView android:id="@+id/tv_comment"android:layout_width="wrap_content" 宽度为包裹内容android:layout_height="wrap_content"android:text="65031条评论"android:textColor="#ff0000"android:layout_alignParentRight="true" 位于右边android:layout_below="@id/tv_detail"/> </RelativeLayout>
Activity:
package com.itheima.xiaozhinews;import java.io.InputStream; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.List;import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException;import com.itheima.xiaozhinews.domain.News; 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.Xml; import android.view.Menu; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.TextView;public class MainActivity extends Activity {List<News> newsList;Handler handler = new Handler(){public void handleMessage(android.os.Message msg) {ListView lv = (ListView) findViewById(R.id.lv);lv.setAdapter(new MyAdapter());}};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);getNewsInfo();//下载新闻xml // ListView lv = (ListView) findViewById(R.id.lv); // //要保证在设置适配器时，新闻xml文件已经解析完毕了 // lv.setAdapter(new MyAdapter()); }class MyAdapter extends BaseAdapter{//得到模型层中元素的数量，用来确定listview需要有多少个条目 @Overridepublic int getCount() {//lv.setAdapter执行的时候就会调用getCount方法就会调用getView方法，//所以要不保证lv.setAdapter执行的时候newsList已经初始化好了，不然就会有空指针，//因此lv.setAdapter执行在子线程中的newsList初始化之后，//由于lv.setAdapter是修改UI所以只能通过子线程发送消息给主线程进行UI修改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);View v = null;ViewHolder mHolder;if(convertView == null){v = View.inflate(MainActivity.this, R.layout.item_listview, null);mHolder = new ViewHolder();//把布局文件中所有组件的对象封装至ViewHolder对象中mHolder.tv_title = (TextView) v.findViewById(R.id.tv_title);mHolder.tv_detail = (TextView) v.findViewById(R.id.tv_detail);mHolder.tv_comment = (TextView) v.findViewById(R.id.tv_comment);mHolder.siv = (SmartImageView) v.findViewById(R.id.iv);//把ViewHolder对象封装至View对象中 v.setTag(mHolder);}else{v = convertView;mHolder = (ViewHolder) v.getTag();}//利用缓存就不用执行findViewById mHolder.tv_title.setText(news.getTitle());mHolder.tv_detail.setText(news.getDetail());mHolder.tv_comment.setText(news.getComment() + "条评论");//给新闻图片imageview设置内容 mHolder.siv.setImageUrl(news.getImageUrl());return v;//返回v所以缓存为View }class ViewHolder{//条目的布局文件中有什么组件，这里就定义什么属性 TextView tv_title;TextView tv_detail;TextView tv_comment;SmartImageView siv;}@Overridepublic Object getItem(int position) {return null;}@Overridepublic long getItemId(int position) {return 0;}}private void getNewsInfo() {Thread t = new Thread(){@Overridepublic void run() {String path = "http://192.168.13.13:8080/news.xml";try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);//连接超时conn.setReadTimeout(5000);//读取超时//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);//之前是文件输入流，这里直接用服务端的流是一样的， }} catch (Exception e) {e.printStackTrace();}}};t.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<News>();}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;}//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，可以发送空消息系统自动创建消息。handler.sendEmptyMessage(1);} catch (Exception e) {e.printStackTrace();}} }
