如何添加圖像到列表視圖（Rss Feed）

Question

嗨新的安卓android現在正在開發一個應用程序來列出一些日期從RSS FEED 解析和所有其他工作很好的問題是，我想添加圖像到列表視圖項目。 內容取自RSS FEED。但Rss Feed不包含任何圖像。我需要將圖像添加到列表視圖。並且圖像對於所有列表項都是相同的。

解析使用DefaultHandler完成...

這是我的列表項頁

public class MainActivity extends Activity { 


    // A reference to the local object 
    private MainActivity local; 

    /** 
    * This method creates main application view 
    */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     // Set view 
     setContentView(R.layout.activity_main); 


     // Set reference to this activity 
     local = this; 

     GetRSSDataTask task = new GetRSSDataTask(); 

     // Start download RSS task 
     task.execute("http://manna.christianchannel.us/feed/"); 



     // Debug the thread name 
     Log.d("Reader", Thread.currentThread().getName()); 
    } 

    private class GetRSSDataTask extends AsyncTask<String, Void, List<RssItem> > { 
     @Override 
     protected List<RssItem> doInBackground(String... urls) { 

      // Debug the task thread name 
      Log.d("Reader", Thread.currentThread().getName()); 

      try { 
       // Create RSS reader 
       RssReader rssReader = new RssReader(urls[0]); 

       // Parse RSS, get items 
       return rssReader.getItems(); 

      } catch (Exception e) { 
       Log.e("Reader", e.getMessage()); 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(List<RssItem> result) { 

      // Get a ListView from main view 
      ListView itcItems = (ListView) findViewById(R.id.listMainView); 

      // Create a list adapter 
      ArrayAdapter<RssItem> adapter = new ArrayAdapter<RssItem>(local,android.R.layout.simple_list_item_1, result); 
      // Set list adapter for the ListView 
      itcItems.setAdapter(adapter); 

      // Set list view item click listener 
      itcItems.setOnItemClickListener(new ListListeners(result, local)); 
     } 
    } 

}

這是我RssParseHandler頁

public class RssParseHandler extends DefaultHandler { 

private List<RssItem> rssItems; 

// Used to reference item while parsing 
private RssItem currentItem; 

// Parsing title indicator 
private boolean parsingTitle; 
// Parsing link indicator 
private boolean parsingLink; 
private boolean parsingDescription; 

public RssParseHandler() { 
    rssItems = new ArrayList<RssItem>(); 
} 

public List<RssItem> getItems() { 
    return rssItems; 
} 

@Override 
public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 
    if ("item".equals(qName)) { 
     currentItem = new RssItem(); 
    } else if ("title".equals(qName)) { 
     parsingTitle = true; 
    } else if ("link".equals(qName)) { 
     parsingLink = true; 
    }else if ("description".equals(qName)) { 

      parsingDescription =true; 


    } 

} 

@Override 
public void endElement(String uri, String localName, String qName) throws SAXException { 

    if ("item".equals(qName)) { 
     rssItems.add(currentItem); 
     currentItem = null; 
    } else if ("title".equals(qName)) { 
     parsingTitle = false; 
    } else if ("link".equals(qName)) { 
     parsingLink = false; 
    } else if ("description".equals(qName)) { 
     parsingDescription=false; 

    } 
} 

@Override 
public void characters(char[] ch, int start, int length) throws SAXException { 
    if (parsingTitle) { 
     if (currentItem != null) 
      currentItem.setTitle(new String(ch, start, length)); 
    } else if (parsingLink) { 
     if (currentItem != null) { 
      currentItem.setLink(new String(ch, start, length)); 
      parsingLink = false; 
     } 
    } else if (parsingDescription) { 
     if (currentItem !=null) { 
      currentItem.setDescription(new String(ch, start, length)); 
      parsingDescription =false; 
     } 
    } 
} 

}

這是我的RSS網頁

public class RssItem { 
// item title 
    private String title; 
    // item link 
    private String link; 
    private String description; 
    private String icons; 

    public String getIcons() { 
     return icons; 
    } 

    public void setIcons(String icons) { 
     this.icons = icons; 
    } 

    public String getTitle() { 
     return title; 
    } 

    public void setTitle(String title) { 
     this.title = title; 
    } 

    public String getLink() { 
     return link; 
    } 

    public void setLink(String link) { 
     this.link = link; 
    } 

    @Override 
    public String toString() { 
     return title; 
    } 

    public String getDescription() { 
     return description; 
    } 

    public void setDescription(String description) { 
     this.description = description; 
    } 

}

Answer 1

添加到@邁克爾的評論。

您需要爲ListView項目創建自己的佈局，以便爲所有行添加相同的圖像。

這裏是XML的一個例子，以及如何Activity創建：

activity_main.xml中：

<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" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context=".MainActivity" > 

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

的ListView行項目（listview_item.xml）：

<?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" > 

    <ImageView 
     android:id="@+id/imageView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:src="@drawable/ic_launcher" /> 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:text="Large Text" 
     android:textAppearance="?android:attr/textAppearanceLarge" /> 
</LinearLayout> 

而MainActivity.java文件：

package com.example.listviewtest; 

import android.os.Bundle; 
import android.app.Activity; 
import android.view.Menu; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class MainActivity extends Activity { 
    private ListView listView; 

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

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

     String[] arr = new String[] { "Android 2.3", "Android 2.3.3", 
      "Android 3.1", "Android 4.0.4", "Android 4.1.2", 
      "Android 4.2.2", "Android 4.3" }; 

      listView.setAdapter(new ArrayAdapter<String>(this, 
       R.layout.listview_item, R.id.textView1, arr)); 
     } 
} 

有趣的部分是您將Adapter添加到ListView的位置。 在這個例子中，我爲ListView項目添加了我自己的XML佈局文件，然後我指定了什麼TextView應該填充我的字符串數組中的文本。