ifranrFeed original

ifanrFeed 中世纪版！随着移动App的流行，曾经在网络阅读中很流行的RSS技术已经很少有人使用了！可是我还是喜欢这种轻量级的简单的阅读体验，ifanr是我很喜欢的科技媒体，所以这个白垩纪的App就以ifanr左右信息源（Feed）！

项目结构

信息源Feed

首先找到ifanr的RSS地址 http://www.ifanr.com/Feed

可以看出RSS也基于xml的一种数据交换格式，所有解析xml的方式 Dom Pull Saxx都可以使用来解析数据。

Pull解析RSS数据

使用Pull方式解析，KXML作为xml的具体实现！

try {
                // 得到解析器工厂，通过静态方法获取一个解析工程对象的引用
                XmlPullParserFactory xpf = XmlPullParserFactory.newInstance();
                // 通过解析器工厂的得到一个XmlPullParser解析器对象
                XmlPullParser parser = xpf.newPullParser();
                // 獲得時間類型
                int eventType = parser.getEventType();

                // 解析器设置输入流和编码格式
                // 把这一句漏了还搞个毛呀
                parser.setInput(is,"UTF-8");

                // while 遍历 ，只要事件类型不等于文档结束标志
                while (eventType != XmlPullParser.END_DOCUMENT) {

                    switch (eventType) {
                    // 如果事件类型为START_DOCUMENT，即读取文档开头
                    case XmlPullParser.START_DOCUMENT:

                        list = new ArrayList<News>();

                        break;
                    // 元素标记开头标志
                    // 运用pull方式解析xml需要知道节点标签的名称
                    case XmlPullParser.START_TAG:

                        if ("item".equals(parser.getName())) {
                            // 衹有當標簽名稱爲user時，新建一個對象
                            news = new News();
                            Log.i("MainActivity","------> " + "new News()");

                        } else if ("index".equals(parser.getName())) {
                            int index = Integer.parseInt(parser.nextText());
                            news.setIndex(index);
                            Log.i("MainActivity","------------------> "
                                    + "設置Index");
                        } else if ("title".equals(parser.getName())) {

                            String title = parser.nextText();// 获取该节点内容
                            if (!title.equals("爱范儿")) {
                                news.setTitle(title);
                            }
                            Log.i("MainActivity","------------------> "
                                    + "設置Title");
                        } else if ("image".equals(parser.getName())) {
                            String image = parser.nextText();// 获取该节点内容
                            news.setImage(image);
                        } else if ("description".equals(parser.getName())) {

                            String description = parser.nextText();// 获取该节点内容
                            if (!description.equals("连接热爱")) {
                                news.setDescription(description);
                            }
                        } else if ("content:encoded".equals(parser.getName())) {
                            // System.out.println("設置password");
                            String content = parser.nextText();// 获取该节点内容
                            news.setContent(content);
                        }

                        break;

                    case XmlPullParser.END_TAG:
                        if ("item".equals(parser.getName())) {
                            Log.i("MainActivity","------> " + "得到RSS item");
                            list.add(news);
                            news = null;

                        }

                        break;

                    }
                    // 每次switch选择后跳转到下一标签，事件类型
                    eventType = parser.next();
                }

            } catch (XmlPullParserException e) {
                // TODO Auto-generated catch block
                System.out.println("nikan 出错了吧");
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return list;

HttpUtils辅助类获取xml信息

package com.example.ifanrFeed.service;



import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
/** * http工具類 * @author QT * */
public class HttpUtils {
    public HttpUtils() {
        // TODO Auto-generated constructor stub
    }
    /** * 通過URL獲取輸入流 * @param path * @return */
    public static InputStream getXml(String path){
        InputStream is=null;
     try {
        URL url=new URL(path);
        if(url!=null){
            //獲得HttpURLConnnection
            HttpURLConnection connection =(HttpURLConnection)url.openConnection();
            //設置屬性
            connection.setConnectTimeout(3000);
            connection.setDoInput(true);
            connection.setRequestMethod("GET");
            int code=connection.getResponseCode();
            //GET請求成功
            if(code==200){
                is=connection.getInputStream();
            }
        }

    } catch (Exception e) {
        // TODO: handle exception
    }
     return is;

    }
}

AsyncTask<String,Void,List<News>> parseTask = new AsyncTask<String,List<News>>() {
        //后台获取List<News>()
        @Override
        protected List<News> doInBackground(String... arg0) {
            String RSSInfo = arg0[0];
            News news = null;
            InputStream is = HttpUtils.getXml(URL);
            Log.i("MainActivity","------> " + "得到RSS Info");
            try {
                // 得到解析器工厂，通过静态方法获取一个解析工程对象的引用
                XmlPullParserFactory xpf = XmlPullParserFactory.newInstance();
                // 通过解析器工厂的得到一个XmlPullParser解析器对象
                XmlPullParser parser = xpf.newPullParser();
                // 獲得時間類型
                int eventType = parser.getEventType();

                // 解析器设置输入流和编码格式
                // 把这一句漏了还搞个毛呀
                parser.setInput(is,"UTF-8");

                // while 遍历 ，只要事件类型不等于文档结束标志
                while (eventType != XmlPullParser.END_DOCUMENT) {

                    switch (eventType) {
                    // 如果事件类型为START_DOCUMENT，即读取文档开头
                    case XmlPullParser.START_DOCUMENT:

                        list = new ArrayList<News>();

                        break;
                    // 元素标记开头标志
                    // 运用pull方式解析xml需要知道节点标签的名称
                    case XmlPullParser.START_TAG:

                        if ("item".equals(parser.getName())) {
                            // 衹有當標簽名稱爲user時，新建一個對象
                            news = new News();
                            Log.i("MainActivity","------> " + "new News()");

                        } else if ("index".equals(parser.getName())) {
                            int index = Integer.parseInt(parser.nextText());
                            news.setIndex(index);
                            Log.i("MainActivity","------------------> "
                                    + "設置Index");
                        } else if ("title".equals(parser.getName())) {

                            String title = parser.nextText();// 获取该节点内容
                            if (!title.equals("爱范儿")) {
                                news.setTitle(title);
                            }
                            Log.i("MainActivity","------------------> "
                                    + "設置Title");
                        } else if ("image".equals(parser.getName())) {
                            String image = parser.nextText();// 获取该节点内容
                            news.setImage(image);
                        } else if ("description".equals(parser.getName())) {

                            String description = parser.nextText();// 获取该节点内容
                            if (!description.equals("连接热爱")) {
                                news.setDescription(description);
                            }
                        } else if ("content:encoded".equals(parser.getName())) {
                            // System.out.println("設置password");
                            String content = parser.nextText();// 获取该节点内容
                            news.setContent(content);
                        }

                        break;

                    case XmlPullParser.END_TAG:
                        if ("item".equals(parser.getName())) {
                            Log.i("MainActivity","------> " + "得到RSS item");
                            list.add(news);
                            news = null;

                        }

                        break;

                    }
                    // 每次switch选择后跳转到下一标签，事件类型
                    eventType = parser.next();
                }

            } catch (XmlPullParserException e) {
                // TODO Auto-generated catch block
                System.out.println("nikan 出错了吧");
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return list;

        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
        }
        //返回主线程，设置数据Adapter
        @Override
        protected void onPostExecute(List<News> result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            adapter = new NewsAdapter();
            listView.setAdapter(adapter);

        }
    };

自定义Adapter，使用ViewHolder模式

class NewsAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return list.size();
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position,View convertView,ViewGroup arg2) {
            LayoutInflater inflater = LayoutInflater.from(MainActivity.this);
            ViewHolder viewHolder = null;

            if (convertView == null) {
                // 若为空，则动态加载一个View
                convertView = inflater.inflate(R.layout.new_item,null);

                // ViewHolder初体验
                viewHolder = new ViewHolder();
                // 减少findViewById()的执行
                /* 不需要每次调用getView()方法就必定调用findViewById() */
                viewHolder.imageItem = (ImageView) convertView
                        .findViewById(R.id.item_image);
                viewHolder.textItem = (TextView) convertView
                        .findViewById(R.id.item_text);

                convertView.setTag(viewHolder);

            } else {

                /* viewHolder通过getTag()完成初始化 */
                viewHolder = (ViewHolder) convertView.getTag();
            }

            News news = list.get(position);

            Picasso.with(MainActivity.this).load(news.getImage()).resize(288,180).centerCrop()
                    .into(viewHolder.imageItem);
            // viewHolder.imageItem.setImageUrl(IMAGE_URL,mImageLoader);
            viewHolder.textItem.setText(news.getTitle());

            return convertView;
        }

    }

    static class ViewHolder {
        private ImageView imageItem;
        private TextView textItem;
    }

实体类News

package com.example.ifanrFeed.model;

import java.io.Serializable;

public class News implements Serializable{
    //索引
    private int index;
    //文章标题
    private String title;
    //文章题图
    private String image;
    //标签
    private String[] category;
    //描述
    private String description;
    //内容
    private String content;
    public int getIndex() {
        return index;
    }
    public void setIndex(int index) {
        this.index = index;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getImage() {
        return image;
    }
    public void setImage(String image) {
        this.image = image;
    }
    public String[] getCategory() {
        return category;
    }
    public void setCategory(String[] category) {
        this.category = category;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
    @Override
    public String toString() {
        return "News [index=" + index + ",title=" + title + ",image=" + image
                + ",content=" + content + "]";
    }



}

布局文件

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.ifanrFeed.MainActivity" tools:ignore="MergeRootFrame" >

    <ListView  android:id="@+id/listView1" android:layout_width="match_parent" android:layout_height="wrap_content" >
    </ListView>

</FrameLayout>

news_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="90dp" android:orientation="vertical" >

     <ImageView  android:id="@+id/item_image" android:layout_width="144dp" android:layout_height="90dp" android:layout_marginLeft="10dp" android:src="@drawable/ic_launcher" />

    <TextView  android:id="@+id/item_text" android:layout_toRightOf="@id/item_image" android:layout_width="wrap_content" android:layout_height="90dp" android:padding="10dp" android:textSize="15sp" android:text="神秘北极圈 阿拉斯加的山巅 谁的脸 出线海角的天边" >
    </TextView>


</RelativeLayout>

获取信息结果

为每个Item添加事件响应

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent,View view,int position,long id) {
                News news=list.get(position);
                Bundle bundle=new Bundle();
                bundle.putSerializable("news",news);

                Intent intent=new Intent(MainActivity.this,NewsActivity.class);
                intent.putExtras(bundle);
                startActivity(intent);

            }
        });

注册创建News展示activity

activity_news.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" >

    <LinearLayout  android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="5dp" android:orientation="vertical" >

        <TextView  android:id="@+id/NewsTitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_margin="5dp" android:text="Title" android:textSize="25sp" />

        <ImageView  android:id="@+id/TitleImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_margin="5dp" />

        <TextView  android:id="@+id/NewsContent" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_margin="5dp" android:text="Content" />
    </LinearLayout>

</ScrollView>

<activity  android:name="com.example.ifanrFeed.NewsActivity" android:label="@string/app_name" >
  </activity>

TextView显示Html格式信息

setContentView(R.layout.activity_news);
        final News news = (News) getIntent().getExtras().getSerializable("news");
        Log.i("MainActivity",news.toString());

        title = (TextView) this.findViewById(R.id.NewsTitle);
        titleImage = (ImageView) this.findViewById(R.id.TitleImage);
        content = (TextView) this.findViewById(R.id.NewsContent);

        title.setText(news.getTitle());
        Picasso.with(getApplicationContext()).load(news.getImage())
                .into(titleImage);

        Spanned newsSpan = Html.fromHtml(news.getContent());
        // content.setText(newsSpan);
        content.setMovementMethod(LinkMovementMethod.getInstance());

这种情况下只支持Html中文字信息，所有图片信息都是一个小方块儿，需要点击才能转到浏览器加载，很影响体验！

TextView异步显示Html中的图片

主要是运用Html.fromHtml 通过设置ImageGetter 获取html 中img 标签的图片信息。

static Spanned  fromHtml(String source,Html.ImageGetter imageGetter,Html.TagHandler tagHandler)

package com.example.ifanrFeed;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.Html;
import android.text.Html.ImageGetter;
import android.text.Spanned;
import android.text.method.LinkMovementMethod;
import android.util.Log;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.ifanrFeed.model.News;
import com.squareup.picasso.Picasso;

public class NewsActivity extends Activity {
    private TextView title;
    private ImageView titleImage;
    private TextView content;
    private Handler handler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_news);
        final News news = (News) getIntent().getExtras()
                .getSerializable("news");
        Log.i("MainActivity",news.toString());

        title = (TextView) this.findViewById(R.id.NewsTitle);
        titleImage = (ImageView) this.findViewById(R.id.TitleImage);
        content = (TextView) this.findViewById(R.id.NewsContent);

        title.setText(news.getTitle());
        Picasso.with(getApplicationContext()).load(news.getImage())
                .into(titleImage);

        Spanned newsSpan = Html.fromHtml(news.getContent());
        // content.setText(newsSpan);
        content.setMovementMethod(LinkMovementMethod.getInstance());

        handler = new Handler() {
            @Override
            public void handleMessage(Message msg) {
                // TODO Auto-generated method stub
                if (msg.what == 0x101) {

                    content.setText((CharSequence) msg.obj);
                }
                super.handleMessage(msg);
            }
        };

        // 因为从网上下载图片是耗时操作 所以要开启新线程
        Thread t = new Thread(new Runnable() {
            Message msg = Message.obtain();

            @Override
            public void run() {

                /** * 要实现图片的显示需要使用Html.fromHtml的一个重构方法：public static Spanned * fromHtml (String source,Html.ImageGetterimageGetter,* Html.TagHandler * tagHandler)其中Html.ImageGetter是一个接口，我们要实现此接口，在它的getDrawable * (String source)方法中返回图片的Drawable对象才可以。 */
                ImageGetter imageGetter = new ImageGetter() {
                    @Override
                    public Drawable getDrawable(String source) {
                        // TODO Auto-generated method stub
                        URL url;
                        Drawable drawable = null;
                        try {
                            url = new URL(source);
                            drawable = Drawable.createFromStream(
                                    url.openStream(),null);
                            drawable.setBounds(0,0,drawable.getIntrinsicWidth(),drawable.getIntrinsicHeight());
                        } catch (MalformedURLException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        } catch (IOException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        return drawable;
                    }
                };
                CharSequence test = Html.fromHtml(news.getContent(),imageGetter,null);
                msg.what = 0x101;
                msg.obj = test;
                handler.sendMessage(msg);
            }
        });
        t.start();

    }

    @Override
    protected void onStart() {
        // TODO Auto-generated method stub
        super.onStart();
    }

    @Override
    protected void onRestart() {
        // TODO Auto-generated method stub
        super.onRestart();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
    }

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
    }
}

News展示页面

MainActivity.java

package com.example.ifanrFeed;

import java.io.IOException;
import java.io.InputStream;
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.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.example.ifanrFeed.model.News;
import com.example.ifanrFeed.service.HttpUtils;
import com.example.ifanrFeed.service.RSSService.RSSList;
import com.squareup.picasso.Picasso;

public class MainActivity extends Activity implements RSSList {
    public static final String URL = "http://www.ifanr.com/Feed";
    private List<News> list;
    private ListAdapter adapter;
    private ListView listView;

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

        listView = (ListView) this.findViewById(R.id.listView1);

        /* * RSSService service = new RSSService(getApplicationContext(),this); * // 监听事件，多线程，此处result还为null service.getRSSInfo(URL); */
        /* * 没吊用，错误的示范 String result=service.getResult(); Log.i("MainActivity",* "00000000000000------>"+result); */
        // Toast.makeText(this,result.subSequence(0,10),
        // Toast.LENGTH_SHORT).show();
        parseTask.execute("kanbujian");

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent,long id) {
                News news=list.get(position);
                Bundle bundle=new Bundle();
                bundle.putSerializable("news",NewsActivity.class);
                intent.putExtras(bundle);
                startActivity(intent);

            }
        });
    }

    AsyncTask<String,List<News>>() {

        @Override
        protected List<News> doInBackground(String... arg0) {
            String RSSInfo = arg0[0];
            News news = null;
            InputStream is = HttpUtils.getXml(URL);
            Log.i("MainActivity","------> " + "得到RSS item");
                            list.add(news);
                            news = null;

                        }

                        break;

                    }
                    // 每次switch选择后跳转到下一标签，事件类型
                    eventType = parser.next();
                }

            } catch (XmlPullParserException e) {
                // TODO Auto-generated catch block
                System.out.println("nikan 出错了吧");
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }

            return list;

        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
        }

        @Override
        protected void onPostExecute(List<News> result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            adapter = new NewsAdapter();
            listView.setAdapter(adapter);

        }
    };

    class NewsAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            // TODO Auto-generated method stub
            return list.size();
        }

        @Override
        public Object getItem(int arg0) {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position,mImageLoader);
            viewHolder.textItem.setText(news.getTitle());

            return convertView;
        }

    }

    static class ViewHolder {
        private ImageView imageItem;
        private TextView textItem;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main,menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button,so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void setRSSInfo(String RSSInfo) {
        Log.i("MainActivity","000000000000003------>" + RSSInfo);

    }

}