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;

@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;
}

}

2、创建解析xml的方法

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 block
e.printStackTrace();
}

}

3、获取网络上的xml

private void getNewsInfo() {
Thread t = new Thread(){
@Override
public 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 block
e.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());
}
};
@Override
protected 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
@Override
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);
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;
}

@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}
}
private void getNewsInfo() {
Thread t = new Thread(){
@Override
public 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 block
e.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 block
e.printStackTrace();
}

}

}