Xlistview解析xml

最新推荐文章于 2016-10-25 20:39:18 发布

原创最新推荐文章于 2016-10-25 20:39:18 发布 · 287 阅读

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本文介绍了一个使用Java实现的Android应用案例，该应用通过网络请求获取新闻数据，并利用XMLPullParser解析XML格式的数据源。文章详细展示了如何创建自定义适配器以显示新闻列表，并实现了XListView的上拉加载更多及下拉刷新功能。

package com.example.weektwo;

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

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

import android.app.Activity;
import android.os.Bundle;

import com.example.week2.entity.News;
import com.example.weektwo.util.SimpleDataExample;
import com.example.weektwo.util.XListView;
import com.example.weektwo.util.XListView.IXListViewListener;
import com.koushikdutta.async.future.FutureCallback;
import com.koushikdutta.ion.Ion;

public class MainActivity extends Activity implements IXListViewListener {

List<News> nList;
List<News> allList = new ArrayList<News>();

int catalog = 1;
int pageIndex = 1;
int pageSize = 20;

XListView lv_main;
MyAdapter adapter;

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

  lv_main = (XListView) findViewById(R.id.lv_main_xlistview);
  adapter = new MyAdapter(this);
  lv_main.setAdapter(adapter);

  // 添加XListView的上拉和下拉刷新监听器
  lv_main.setPullLoadEnable(true);
  lv_main.setPullRefreshEnable(true);
  lv_main.setXListViewListener(this);

getData();
}

// 请求网络
private void getData() {
  // TODO Auto-generated method stub
  String ulr = "http://www.oschina.net/action/api/news_list?catalog=1&pageIndex="
    + pageIndex + "&pageSize=20";
  Ion.with(getApplicationContext()).load(ulr).asString()
    .setCallback(new FutureCallback<String>() {

     @Override
     public void onCompleted(Exception e, String result) {
      // TODO Auto-generated method stub

if (e != null) {

return;
}

      pull(result);
      allList.addAll(nList);
      adapter.addrest(allList);

}
});

}

//
public void pull(String xml) {

News books = null;

  try {
   // 获取factory
   XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
   // 获取 parser
   XmlPullParser parser = factory.newPullParser();

   ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(
     xml.getBytes());
   // 设置流
   parser.setInput(byteArrayInputStream, "UTF-8");

int type_pull = parser.getEventType();

while (parser.getEventType() != XmlPullParser.END_DOCUMENT) {

switch (type_pull) {

case XmlPullParser.START_DOCUMENT:// 开始接收文件(走一次)
nList = new ArrayList<News>();

     break;
    case XmlPullParser.START_TAG:// 开始解析元素
     if ("news".equals(parser.getName())) {
      // 得到对象呀
      books = new News();

}

if (books != null) {

if ("id".equals(parser.getName())) {

books.id = parser.nextText();

} else if ("title".equals(parser.getName())) {

books.title = parser.nextText();

} else if ("body".equals(parser.getName())) {

books.body = parser.nextText();
} else if ("commentCount".equals(parser.getName())) {

books.commentCount = parser.nextText();
} else if ("author".equals(parser.getName())) {

books.author = parser.nextText();
} else if ("authorid".equals(parser.getName())) {

books.authorid = parser.nextText();
} else if ("pubDate".equals(parser.getName())) {

books.pubDate = parser.nextText();
} else if ("newstype".equals(parser.getName())) {

if ("type".equals(parser.getName())) {

books.newstype.type = parser.nextText();
} else if ("authoruid2".equals(parser.getName())) {

books.newstype.authoruid2 = parser.nextText();
}

}

break;
case XmlPullParser.END_TAG:// 结束解析元素

     // 判断是不是 Book
     if ("news".equals(parser.getName())) {
      nList.add(books);
     }

break;
case XmlPullParser.END_DOCUMENT:// 结束接收文件

break;

    default:
     break;
    }

type_pull = parser.next();
}

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

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

}

@Override
public void onRefresh() {
// TODO Auto-generated method stub

  pageIndex = 1;
  nList.clear();
  allList.clear();
  getData();

   SimpleDataExample.setFormat("dddddddddddd", getApplicationContext());
         SimpleDataExample.getFormat("dddddddddddd", getApplicationContext(), lv_main);
}

@Override
public void onLoadMore() {
// TODO Auto-generated method stub

  pageIndex ++;
  getData();

   SimpleDataExample.setFormat("dddddddddddd", getApplicationContext());
         SimpleDataExample.getFormat("dddddddddddd", getApplicationContext(), lv_main);
}

}