Android学习（48） -- 获取xml文件并解析.

1、根据xml的格式创建JavaBean

public class News {private String title;private String detail;private String comment;private String imageUrl;@Overridepublic 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;}}

2、创建解析xml的方法

       由于结点很多，需要创建一个List来进行存储，在开始结点的时候初始化List、并拼装对象

当一个对象结束后，也就是在结束结点的时候，将对象添加到List中去

     解析完一个对象结点后，继续寻找下一个进行解析 

List<News> newsList;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();} //for (News n : newsList) {//System.out.println(n.toString());//}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}

3、获取网络上的xml

private void getNewsInfo() {Thread t = new Thread(){@Overridepublic void run() {String path = "http://192.168.1.103:8080/news.xml";try {URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);conn.setReadTimeout(5000);//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 blocke.printStackTrace();}}};t.start();}

核心完整代码

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();//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() {// TODO Auto-generated method stubreturn 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();}//给三个文本框设置内容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;}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);conn.setReadTimeout(5000);//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 blocke.printStackTrace();}}};t.start();}List<News> newsList;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handler.sendEmptyMessage(1);//for (News n : newsList) {//System.out.println(n.toString());//}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}