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解析XML上拉加载与下拉刷新

2016-05-13 20:52 225 查看

完成下拉刷新、上拉加载需要导jar包（Ion、androidasync），类库、util

package com.bw.week2;

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 android.util.Log;

import com.bw.week2.adapter.MyBaseAdapter;

import com.bw.week2.adapter.bean.News;

import com.bw.week2.util.SimpleDataExample;

import com.bw.week2.util.XListView;

import com.bw.week2.util.XListView.IXListViewListener;

import com.koushikdutta.async.future.FutureCallback;

import com.koushikdutta.ion.Ion;

public class MainActivity extends Activity implements IXListViewListener {

   private static final String TAG = "MainActivity";

   private XListView xlv_view;

   private MyBaseAdapter adapter;

   int pageIndex = 1;

   int pageSize = 20;

   int catalog = 1;

   private ArrayList<News> nList;

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

   @Override

   protected void onCreate(Bundle savedInstanceState) {

       super.onCreate(savedInstanceState);

       setContentView(R.layout.activity_main);

       xlv_view = (XListView) findViewById(R.id.xlv_view);

       adapter = new MyBaseAdapter(this);

       xlv_view.setAdapter(adapter);



       //添加xlistview的上拉和下拉刷新监听器

       xlv_view.setPullLoadEnable(true);

       xlv_view.setPullRefreshEnable(true);

       xlv_view.setXListViewListener(this);

       // 请求网络方法

       getData();

   }

   private void getData() {

       String url = "http://www.oschina.net/action/api/news_list?catalog=1&pageIndex="

               + pageIndex + "&pageSize=20";

       Ion.with(getApplicationContext()).load(url).asString()

               .setCallback(new FutureCallback<String>() {

                   @Override

                   public void onCompleted(Exception e, String result) {

                       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 arrayInputStream = new ByteArrayInputStream(

                   xml.getBytes());

           // 设置流

           parser.setInput(arrayInputStream, "UTF-8");

           int eventType = parser.getEventType();

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

               switch (eventType) {

               case XmlPullParser.START_DOCUMENT:// 开始接收文件（走一次）

                   nList = new ArrayList<News>();

                   break;

               case XmlPullParser.START_TAG:// 开始解析元件

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

                       // 得到对象

                       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();

                           }

                           Log.d(TAG,parser.getName());

                       }

                   }

                   break;

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

                   // 判断不是Book

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

                       nList.add(books);

                   }

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

                   break;

               default:

                   break;

               }



               eventType = 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() {

       pageIndex = 1;

       nList.clear();

       allList.clear();

       getData();



       SimpleDataExample.setFormat("dddddddddddd", getApplicationContext());

       SimpleDataExample.getFormat("ddddddddddddd", getApplicationContext(), xlv_view);



   }

   @Override

   public void onLoadMore() {

       pageIndex++;

       getData();

       SimpleDataExample.setFormat("ddddddddddddd", getApplicationContext());

       SimpleDataExample.getFormat("dddddddddddd", getApplicationContext(), xlv_view);

   }

}

适配器

package com.bw.week2.adapter;

import java.util.ArrayList;

import java.util.List;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.TextView;

import com.bw.week2.MainActivity;

import com.bw.week2.R;

import com.bw.week2.adapter.bean.News;

public class MyBaseAdapter extends BaseAdapter {

   MainActivity context;

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

   public MyBaseAdapter(MainActivity context) {

       super();

       this.context = context;

   }

   public void addrest(List<News> nList) {

       this.nList.clear();

       this.nList.addAll(nList);

       this.notifyDataSetChanged();

   }

   @Override

   public int getCount() {

       return nList.size();

   }

   @Override

   public Object getItem(int position) {

       return null;

   }

   @Override

   public long getItemId(int position) {

       return 0;

   }

   @Override

   public View getView(int position, View convertView, ViewGroup parent) {

       ViewHolder viewHolder;

       if (convertView == null) {

           convertView = View.inflate(context, R.layout.item, null);

           viewHolder = new ViewHolder();

           viewHolder.tv_item_name = (TextView) convertView

                   .findViewById(R.id.tv_item_name);

           viewHolder.tv_item_date = (TextView) convertView

                   .findViewById(R.id.tv_item_date);

           convertView.setTag(viewHolder);

       } else {

           viewHolder = (ViewHolder) convertView.getTag();

       }

       viewHolder.tv_item_name.setText(nList.get(position).title);

       viewHolder.tv_item_date.setText(nList.get(position).pubDate);

       return convertView;

   }

   class ViewHolder {

       TextView tv_item_name;

       TextView tv_item_date;

   }

}

XML布局（MainActivity）

<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" >

    <com.bw.week2.util.XListView

        android:id="@+id/xlv_view"

        android:layout_width="match_parent"

        android:layout_height="match_parent" >

    </com.bw.week2.util.XListView>

</RelativeLayout>

item布局

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/tv_item_name"

        android:layout_width="match_parent"

        android:layout_height="25dp" />

    <TextView

        android:id="@+id/tv_item_date"

        android:layout_width="match_parent"

        android:layout_height="25dp" />

</LinearLayout>

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