解析网络json数据并展示到ListView上

网易新闻看起来很简洁，左边是一张图片，右边是一些文字信息，这样的排版是十分常见的，给人的感觉就是简洁明了，下面通过解析网络json数据并展示到ListView上，来实现同样的效果，效果图如下：

1.数据来源于网上json数据的解析，网址为http://mrobot.pcauto.com.cn/v2/cms/channels/3?pageNo=1&pageSize=20&v=4.0.0（可能过段时间就失效了），如果想了解json解析或者获取json数据接口，参照：http://blog.csdn.net/ljw124213/article/details/52313758。json的格式如下(这里只解析title,image和pubDate三个字段)：

2.先写出解析此json数据的实体类：

<span style="font-size:18px;">package com.example.listview;

import java.util.ArrayList;

public class CarBean {
	
	public ArrayList<Car>data;
	
	public static class Car{
		public String title;
		public String pubDate;
		public String image;
	}
}</span><span style="font-size:14px;">
</span>

3.解析json数据的工具类：

<span style="font-size:18px;">package com.example.listview;

import com.google.gson.Gson;

public class JsonUtils {
	public static CarBean parseJson(String jsonString){
		Gson gson = new Gson();
		CarBean cb = gson.fromJson(jsonString, CarBean.class);
		return cb;
	}
}</span>

注意：使用Gson解析的话，必须先下载Gson的jar包，放到工程的libs目录下，下载地址：http://download.csdn.net/detail/ljw124213/9612607

4.从网络上下载数据的工具类：

<span style="font-size:18px;">package com.example.listview;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class NetUtils {

	public static byte[] getNetData(String urlString){
		try {
			URL url = new URL(urlString);
			HttpURLConnection conn = (HttpURLConnection) url.openConnection();
			
			conn.setRequestMethod("GET");
			conn.setReadTimeout(5000);
			conn.setConnectTimeout(5000);
			
			byte[] result = null;
			if (conn.getResponseCode() == 200) {
				InputStream is = conn.getInputStream();
				ByteArrayOutputStream baos = new ByteArrayOutputStream();
				byte[] buffer = new byte[1024];
				int len = 0;
				while((len=is.read(buffer))!=-1){
					baos.write(buffer, 0, len);
				}
				result = baos.toByteArray();
			}
			return result;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return null;
	}
}</span>

5.下载android-smart-image-view开源框架，把其src下的部分复制到自己工程的src下面，下载地址（带有使用详解）：

http://download.csdn.net/detail/ljw124213/9630820

6.准备工作完成之后，下面开始实现具体功能，创建一个异步任务类，来下载网络数据：

<span style="font-size:18px;">package com.example.listview;

import java.util.ArrayList;

import android.content.Context;
import android.os.AsyncTask;
import android.widget.Toast;

import com.example.day09_listview.CarBean.Car;

public class DownAsynctask extends AsyncTask<String, Void, byte[]>{

	ArrayList<Car>data;
	MyAdapter adapter;
	Context context;
	
	public DownAsynctask(ArrayList<Car> data, MyAdapter adapter, Context context) {
		super();
		this.data = data;
		this.adapter = adapter;
		this.context = context;
	}

	@Override
	protected byte[] doInBackground(String... params) {
		return NetUtils.getNetData(params[0]);
	}

	@Override
	protected void onPostExecute(byte[] result) {
		super.onPostExecute(result);
		if (result != null) {
			String jsonString = new String(result);
			CarBean cb = JsonUtils.parseJson(jsonString);
			data.addAll(cb.data);
			adapter.notifyDataSetChanged();
		}else {
			Toast.makeText(context, "网络异常", Toast.LENGTH_SHORT).show();
		}
	}
}</span>

7.创建一个数据适配器，用来加载数据：

<span style="font-size:18px;">package com.example.listview;

import java.util.ArrayList;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.day09_listview.CarBean.Car;
import com.loopj.android.image.SmartImageView;

public class MyAdapter extends BaseAdapter{

	ArrayList<Car> data;
	Context context;
	
	public MyAdapter(ArrayList<Car> data, Context context) {
		super();
		this.data = data;
		this.context = context;
	}

	@Override
	public int getCount() {
		return data.size();
	}

	@Override
	public Object getItem(int arg0) {
		return data.get(arg0);
	}

	@Override
	public long getItemId(int arg0) {
		return arg0;
	}

	@Override
	public View getView(int arg0, View arg1, ViewGroup arg2) {
		ViewHold holder;
		if(arg1 == null){
			arg1 = View.inflate(context, R.layout.item, null);
			
			holder = new ViewHold();
			holder.tv_title = (TextView) arg1.findViewById(R.id.tv_title);
			holder.tv_date = (TextView) arg1.findViewById(R.id.tv_date);
			holder.iv = (SmartImageView) arg1.findViewById(R.id.iv);
			
			arg1.setTag(holder);
			
		}else {
			holder = (ViewHold) arg1.getTag();
		}
		Car car = data.get(arg0);
		holder.tv_title.setText(car.title);
		holder.tv_date.setText(car.pubDate);
		
		//使用SmartImageView的setImageUrl方法下载图片
		holder.iv.setImageUrl(car.image);
		
		return arg1;
	}

     class ViewHold{
		SmartImageView iv;
		TextView tv_title;
		TextView tv_date;
	}
}</span>

8.在MainActivity中进行数据的汇总：

<span style="font-size:18px;">package com.example.listview;

import java.util.ArrayList;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;

import com.example.day09_listview.CarBean.Car;

public class MainActivity extends Activity {

	private ListView lv;
	private ArrayList<Car> data;
	private MyAdapter adapter;
	private boolean flag = false;
	private int pageNo = 1;
	private ExecutorService es;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		lv = (ListView) findViewById(R.id.lv);
		
		data = new ArrayList<Car>();
		
		adapter = new MyAdapter(data,this);
		
		//给listview设置一个底部view(必须在设置数据之前)
		View footView = View.inflate(this, R.layout.foot, null);
		lv.addFooterView(footView);
		
		lv.setAdapter(adapter);
		
		//使用线程池来实现异步任务的多线程下载
		es = Executors.newFixedThreadPool(10);
		new DownAsynctask(data,adapter,this).executeOnExecutor(es, "http://mrobot.pcauto.com.cn/v2/cms/channels/3?pageNo="+pageNo+"&pageSize=20&v=4.0.0");
		
		/*
		 * 对listview设置滚动监听事件，实现分页加载数据
		 */
		lv.setOnScrollListener(new OnScrollListener() {
			
			@Override
			public void onScrollStateChanged(AbsListView view, int scrollState) {
				//如果停止了滑动且滑动到了结尾，则更新数据
				if (scrollState == OnScrollListener.SCROLL_STATE_IDLE && flag == true) {
					pageNo += 1;
					new DownAsynctask(data,adapter,MainActivity.this).executeOnExecutor(es, "http://mrobot.pcauto.com.cn/v2/cms/channels/3?pageNo="+pageNo+"&pageSize=20&v=4.0.0");
				}
			}
			
			@Override
			public void onScroll(AbsListView view, int firstVisibleItem,
					int visibleItemCount, int totalItemCount) {
				//判断是否滑动到了结尾
				if (firstVisibleItem + visibleItemCount == totalItemCount) {
					flag = true;
				}else {
					flag = false;
				}
			}
		});
	}
}</span>

9.ListView对应的布局文件activity_main.xml：

<span style="font-size:18px;"><span style="font-size:18px;"><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" />

</RelativeLayout></span></span>

10.ListView对应的item的布局文件item.xml:

<span style="font-size:18px;"><?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="horizontal" >
    
    <!-- 注意：这里的ImageView要改为包名+SmartImageView -->
    <com.loopj.android.image.SmartImageView
        android:id="@+id/iv"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:src="@drawable/ic_launcher"/>
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_marginLeft="15dp"
        android:orientation="vertical">
        <TextView 
            android:id="@+id/tv_title"
            android:layout_height="0dp"
            android:layout_width="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="10dp"
            android:textSize="20sp"/>
        <TextView 
            android:id="@+id/tv_date"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:textSize="16sp"
            android:textColor="#aaa"/>
    </LinearLayout>

</LinearLayout></span>

11.ListView尾布局对应的布局文件footer.xml:

<span style="font-size:18px;"><span style="font-size:18px;"><?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="horizontal" >
    
    <!-- 注意：这里的ImageView要改为包名+SmartImageView -->
    <com.loopj.android.image.SmartImageView
        android:id="@+id/iv"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:src="@drawable/ic_launcher"/>
    <LinearLayout 
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_marginLeft="15dp"
        android:orientation="vertical">
        <TextView 
            android:id="@+id/tv_title"
            android:layout_height="0dp"
            android:layout_width="match_parent"
            android:layout_weight="1"
            android:layout_marginTop="10dp"
            android:textSize="20sp"/>
        <TextView 
            android:id="@+id/tv_date"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:textSize="16sp"
            android:textColor="#aaa"/>
    </LinearLayout>

</LinearLayout></span></span>

提示：此数据接口可能很快就不能用来，如果需要测试的话，可以把原数据放到tomcat服务器中进行测试，下面是完整数据：

{
    "data": [
        {
            "articleType": "n",
            "count": 29,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/8/14733163729178590_600.jpg",
            "id": "8562073",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/08/g_8562073_1473339813478_240x160.jpg",
            "mtime": 1473351348000,
            "pubDate": "2016-09-09",
            "title": "新福特翼虎购车手册 家用中配足够实用",
            "ups": 26,
            "url": "http://www.pcauto.com.cn/teach/856/8562073.html"
        },
        {
            "articleType": "n",
            "count": 37,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1608/31/8655654_toutu_thumb.jpg",
            "id": "8655654",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8655654_1472800030976_240x160.jpg",
            "mtime": 1473351337000,
            "pubDate": "2016-09-09",
            "title": "年轻人第一台车 10万左右精品车型推荐",
            "ups": 130,
            "url": "http://www.pcauto.com.cn/teach/865/8655654.html"
        },
        {
            "articleType": "n",
            "count": 35,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1609/06/8719572_toutu_thumb.jpg",
            "id": "8719572",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/06/g_8719572_1473152785181_240x160.jpg",
            "mtime": 1473264982000,
            "pubDate": "2016-09-08",
            "title": "豪门不“壕” 4款入门豪华SUV仅售23万起",
            "ups": 143,
            "url": "http://www.pcauto.com.cn/teach/871/8719572.html"
        },
        {
            "articleType": "n",
            "count": 40,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/1/14727375445822660_600.jpg",
            "id": "8705572",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/07/g_8705572_1473242245557_240x160.jpg",
            "mtime": 1473264969000,
            "pubDate": "2016-09-08",
            "title": "明锐对比英朗 当欧洲绅士遇上美国大汉",
            "ups": 52,
            "url": "http://www.pcauto.com.cn/teach/870/8705572.html"
        },
        {
            "articleType": "n",
            "count": 68,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/6/14731526553913750_600.jpg",
            "id": "8719262",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/06/g_8719262_1473151845818_240x160.jpg",
            "mtime": 1473153591000,
            "pubDate": "2016-09-06",
            "title": "新晋英伦长轴距座驾 捷豹XFL实拍解析",
            "ups": 299,
            "url": "http://www.pcauto.com.cn/teach/871/8719262.html"
        },
        {
            "articleType": "n",
            "count": 100,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1609/07/8695292_999_thumb.jpg",
            "id": "8695292",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/01/g_8695292_1472695974218_240x160.jpg",
            "mtime": 1473137438000,
            "pubDate": "2016-09-06",
            "title": "15万元搞定 四款独立后悬挂合资SUV推荐",
            "ups": 117,
            "url": "http://www.pcauto.com.cn/teach/869/8695292.html"
        },
        {
            "articleType": "n",
            "count": 84,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1609/06/8718677_xin1000_thumb.jpg",
            "id": "8718677",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/05/g_8718677_1473061488223_240x160.jpg",
            "mtime": 1473092132000,
            "pubDate": "2016-09-06",
            "title": "8万元选靠谱SUV 4款新推自主车型推荐",
            "ups": 91,
            "url": "http://www.pcauto.com.cn/teach/871/8718677.html"
        },
        {
            "articleType": "n",
            "count": 96,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20168/29/14724733055558460_600.jpg",
            "id": "8683971",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8683971_1472803720871_240x160.jpg",
            "mtime": 1473005791000,
            "pubDate": "2016-09-05",
            "title": "凯美瑞对比雅阁 谁才是日系中级车霸主",
            "ups": 65,
            "url": "http://www.pcauto.com.cn/teach/868/8683971.html"
        },
        {
            "articleType": "n",
            "count": 136,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1609/04/8716791_00_thumb.jpg",
            "id": "8716791",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/04/g_8716791_1473002216143_240x160.jpg",
            "mtime": 1473005746000,
            "pubDate": "2016-09-05",
            "title": "精华都在这里 成都车展最值得关注的SUV",
            "ups": 390,
            "url": "http://www.pcauto.com.cn/teach/871/8716791.html"
        },
        {
            "articleType": "n",
            "count": 26,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/4/14729794978954170_600.jpg",
            "id": "8716391",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/04/g_8716391_1472979896686_240x160.jpg",
            "mtime": 1472980188000,
            "pubDate": "2016-09-04",
            "title": "2016成都车展：静态评测奔驰新一代威霆",
            "ups": 312,
            "url": "http://www.pcauto.com.cn/teach/871/8716391.html"
        },
        {
            "articleType": "n",
            "count": 32,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1609/01/8700555_8207206_03_thumb.jpg",
            "id": "8700555",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/01/g_8700555_1472716638381_240x160.jpg",
            "mtime": 1472919329000,
            "pubDate": "2016-09-04",
            "title": "入门性价比爆炸 新款致炫购车手册",
            "ups": 91,
            "url": "http://www.pcauto.com.cn/teach/870/8700555.html"
        },
        {
            "articleType": "n",
            "count": 70,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/2/14728310541595730_600.jpg",
            "id": "8712133",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8712133_1472831164431_240x160.jpg",
            "mtime": 1472832200000,
            "pubDate": "2016-09-03",
            "title": "2016成都车展：静态评测北京现代胜达",
            "ups": 468,
            "url": "http://www.pcauto.com.cn/teach/871/8712133.html"
        },
        {
            "articleType": "n",
            "count": 41,
            "downs": 0,
            "firstImg": "http://img0.pcauto.com.cn/pcauto/1609/02/8710078_1000_thumb.jpg",
            "id": "8710078",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8710078_1472810381352_240x160.jpg",
            "mtime": 1472817162000,
            "pubDate": "2016-09-02",
            "title": "2016成都车展：静态评测新款玛莎拉蒂总裁",
            "ups": 299,
            "url": "http://www.pcauto.com.cn/teach/871/8710078.html"
        },
        {
            "articleType": "n",
            "count": 62,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/2/14728116986128820_600.jpg",
            "id": "8711094",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8711094_1472812405190_240x160.jpg",
            "mtime": 1472812618000,
            "pubDate": "2016-09-02",
            "title": "2016成都车展：静态评测大众新桑塔纳",
            "ups": 1053,
            "url": "http://www.pcauto.com.cn/teach/871/8711094.html"
        },
        {
            "articleType": "n",
            "count": 28,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/2/14728073809221840_600.jpg",
            "id": "8710334",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8710334_1472807999865_240x160.jpg",
            "mtime": 1472808197000,
            "pubDate": "2016-09-02",
            "title": "2016成都车展：静态体验北京现代悦纳",
            "ups": 247,
            "url": "http://www.pcauto.com.cn/teach/871/8710334.html"
        },
        {
            "articleType": "n",
            "count": 31,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/2/14728054816668520_600.jpg",
            "id": "8710116",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8710116_1472805803455_240x160.jpg",
            "mtime": 1472806069000,
            "pubDate": "2016-09-02",
            "title": "2016成都车展：静态评测东南DX3",
            "ups": 247,
            "url": "http://www.pcauto.com.cn/teach/871/8710116.html"
        },
        {
            "articleType": "n",
            "count": 60,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/2/14728006933643890_600.jpg",
            "id": "8709146",
            "image": "http://img0.pcauto.com.cn/pcauto/1609/02/g_8709146_1472801055169_240x160.jpg",
            "mtime": 1472801551000,
            "pubDate": "2016-09-02",
            "title": "2016成都车展：静态评测宝马X1混动版",
            "ups": 806,
            "url": "http://www.pcauto.com.cn/teach/870/8709146.html"
        },
        {
            "articleType": "n",
            "count": 87,
            "downs": 0,
            "firstImg": "http://img.pcauto.com.cn/images/pcautogallery/modle/article/20169/2/14727918621883140_600.jpg",
            "id": "8708181",
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作者：ljw124213 发表于2016/9/14 21:46:58 原文链接

阅读：118 评论：0 查看评论

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