如何从雅虎天气检索RSS FEED

Question

我试图从Yahho天气检索RSS数据，但是我的代码无法工作。 我可以知道它有什么问题吗？ 我使用的网址是http://weather.yahooapis.com/forecastrss?w=1062617&u=c。 我是一个编程新手，请向你寻求建议。

谢谢

以下是我的编码。

CXActivity.java

public class CXActivity extends Activity { 
    /** Called when the activity is first created. */ 

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

     RestClient rc = new RestClient(); 

     //the account key might not work. Please insert your own set. 
     ArrayList<Weather> list1 = rc.getPlaces("", ""); 
     int index = 3; 
     String[] listArray = new String[list1.size()]; 
     StringBuilder sb = new StringBuilder(); 
     int counter = 0; 
     for(int i = 1; i<list1.size(); i++) 
     { 
       sb.append("\n\nEntry #: " + i); 
       sb.append("\n" + "Title: \""+ list1.get(i).getTitle() + "\""); 
       sb.append("\n" + "Publish Date: \""+ list1.get(i).getPubDate() +"\""); 
       sb.append("\n" + "Condition: \""+ list1.get(i).getCondition()+"\""); 
       sb.append("\n" + "Forecast: \""+ list1.get(i).getForecast()+"\""); 

       listArray[counter] = sb.toString(); 
       counter++; 
       sb.delete(0, sb.capacity()); 
     } 

     listview=(ListView)findViewById(R.id.ListView01); 
     listview.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 , listArray)); 

    } 
} 

RestClient.java

public class RestClient 
{ 

    ArrayList weatherList; 

    //This is the function responsible to pull data from web service. 
    public ArrayList<Weather> getPlaces(String accountKey, String uniqueId) 
    { 
      weatherList = new ArrayList<Weather>(); 
      try { 
      URL _url = new URL("http://weather.yahooapis.com/forecastrss?w=1062617&u=c"); 
      URLConnection _urlConn = _url.openConnection(); 

      _urlConn.addRequestProperty("AccountKey", accountKey); 
      _urlConn.addRequestProperty("UniqueUserID", uniqueId); 

      BufferedReader br = new BufferedReader(new InputStreamReader(_urlConn.getInputStream())); 

      String line = null; 
      StringBuilder strBuilder = new StringBuilder(); 

      while ((line = br.readLine()) != null) { 
       strBuilder.append(line); 
       System.out.println(line); 
      } 

       String[] IProperties = strBuilder.toString().split("<m:properties>"); 

       for (String str : IProperties) 
       { 
         Weather weather = new Weather();      
         weather.setTitle(Utils.getStringBetween(str, "<title>", "</<title>>")); 
         weather.setPubDate(Utils.getStringBetween(str, "<pubDate>", "</pubDate>")); 
         weather.setCondition(Utils.getStringBetween(str, "<yweather:condition>", "</yweather:condition>")); 
         weather.setForecast(Utils.getStringBetween(str, "<yweather:forecast>", "</yweather:forecast>")); 

         weatherList.add(weather); 
       } 
      } 
      catch (MalformedURLException ex) 
      { 
       ex.printStackTrace(); 
      } 
      catch (IOException ex) 
      { 
       ex.printStackTrace(); 
      } 
      catch (Exception ex) 
      { 
       ex.printStackTrace(); 
      } 

      return weatherList; 
     } 


    //This is a helper function to get specific traffic data structure 
    public Weather getPlacesAtIndex(ArrayList<Weather> list, int index) 
    {  
     if(list.size() <= index) return null; 

     return list.get(index); 
    } 

} 

Utils.java

public class Utils { 

    //This functions get the xml data between the xml elements 
    public static String getStringBetween(String src, String start, String end) 
    { 
     StringBuilder sb = new StringBuilder(); 
     int startIdx = src.indexOf(start) + start.length(); 
     int endIdx = src.indexOf(end); 
      while(startIdx < endIdx) 
      { 
       sb.append("" + String.valueOf(src.charAt(startIdx))); 
       startIdx++; 
      } 

     return sb.toString(); 
    } 
} 

weather.java

public class Weather { 
    String Title; 
    String PubDate; 
    String Condition; 
    String Forecast; 



    public String getTitle() { 
     return Title; 
    } 
    public void setTitle(String title) { 
     Title = title; 
    } 
    public String getPubDate() { 
     return PubDate; 
    } 
    public void setPubDate(String pubDate) { 
     PubDate = pubDate; 
    } 
    public String getCondition() { 
     return Condition; 
    } 
    public void setCondition(String condition) { 
     Condition = condition; 
    } 

    public String getForecast() { 
     return Forecast; 
    } 
    public void setForecast(String forecast) { 
     Forecast = forecast; 
} 

} 

Answer 1

请更改您的活动代码。

公共类MainActivity延伸活动

{ /**当首先创建活动调用。 */

ListView listview; 

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

    RestClient rc = new RestClient(); 

    // the account key might not work. Please insert your own set. 
    ArrayList<Weather> list1 = rc.getPlaces("", ""); 
    int index = 3; 
    String[] listArray = new String[list1.size()]; 
    StringBuilder sb = new StringBuilder(); 
    int counter = 0; 
    Log.e("N", "listArray::" + list1.size()); 

    for (int i = 0; i < list1.size(); i++) { 
     sb.append("\n\nEntry #: " + i); 
     sb.append("\n" + "Title: \"" + list1.get(i).getTitle() + "\""); 
     sb.append("\n" + "Publish Date: \"" + list1.get(i).getPubDate() 
       + "\""); 
     sb.append("\n" + "Condition: \"" + list1.get(i).getCondition() 
       + "\""); 
     sb.append("\n" + "Forecast: \"" + list1.get(i).getForecast() + "\""); 

     listArray[counter] = sb.toString(); 
     counter++; 
     sb.delete(0, sb.capacity()); 
    } 
    Log.e("N", "listArray::" + listArray.length); 

    listview = (ListView) findViewById(R.id.listView); 
    listview.setAdapter(new ArrayAdapter<String>(this, 
      android.R.layout.simple_list_item_1, listArray)); 

} 

}