在Android中从互联网读取XML

问题描述：

如何从使用android的互联网从xml检索所有值。我找到了一个很好的教程，并执行它http://www.anddev.org/novice-tutorials-f8/parsing-xml-from-the-net-using-the-saxparser-t353.html，但我只能够检索到我的xml的最后一项:(我想在简单的ListView中显示结果在Android中从互联网读取XML

这是我在互联网上主持的xml文件http://www.rahmanrahim.com/webservicekos/allkos（对不起，我不能正常发布吧）

这是我MainActivity.java

package com.example.cobaxmlparser; 

import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLConnection; 

import javax.xml.parsers.SAXParser; 
import javax.xml.parsers.SAXParserFactory; 

import org.xml.sax.InputSource; 
import org.xml.sax.XMLReader; 

import android.annotation.SuppressLint; 
import android.app.Activity; 
import android.os.Bundle; 
import android.os.StrictMode; 
import android.util.Log; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 
import android.widget.TextView; 

public class MainActivity extends Activity { 



/** Called when the activity is first created. */ 
@SuppressLint("NewApi") 
@Override 

public void onCreate(Bundle icicle) { 
    super.onCreate(icicle); 
    setContentView(R.layout.activity_main); 
    /* Create a new TextView to display the parsingresult later. */ 
    TextView tv = new TextView(this); 
    ListView view = (ListView) findViewById(R.id.view); 
    String[] hasilXml = new String[21]; 
    int x = 0; 
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
    StrictMode.setThreadPolicy(policy); 
    try { 
     /* Create a URL we want to load some xml-data from. */ 
     URL url = new URL("http://www.rahmanrahim.com/webservicekos/allkos"); 
     HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection(); 
     //URLConnection urlConnection = url.openConnection(); 
     urlConnection.setRequestMethod("GET"); 

     urlConnection.setDoOutput(true); 
     urlConnection.connect(); 
     /* Get a SAXParser from the SAXPArserFactory. */ 
     SAXParserFactory spf = SAXParserFactory.newInstance(); 
     SAXParser sp = spf.newSAXParser(); 

     /* Get the XMLReader of the SAXParser we created. */ 
     XMLReader xr = sp.getXMLReader(); 
     /* Create a new ContentHandler and apply it to the XML-Reader*/ 
     ExampleHandler myExampleHandler = new ExampleHandler(); 
     xr.setContentHandler(myExampleHandler); 

     /* Parse the xml-data from our URL. */ 
     xr.parse(new InputSource(url.openStream())); 
     /* Parsing has finished. */ 

     /* Our ExampleHandler now provides the parsed data to us. */ 
     ParsedExampleDataSet parsedExampleDataSet = 
           myExampleHandler.getParsedData(); 

     /* Set the result to be displayed in our GUI. */ 
     //tv.setText(parsedExampleDataSet.toString()); 
     //String cek = parsedExampleDataSet.toString(x); 
     hasilXml[x] = parsedExampleDataSet.toString(); 
     x++; 
     System.out.println("nilai x adalah : " + x); 
     //tv.setText(cek); 


    } catch (Exception e) { 
     /* Display any Error to the GUI. */ 
     tv.setText("Error: " + e.getMessage()); 
     Log.e(MY_DEBUG_TAG, "WeatherQueryError", e); 
    } 
    /* Display the TextView. */ 
    //this.setContentView(tv); 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, hasilXml); 
    view.setAdapter(adapter); 
}

}

这里是我的ExampleHandler.java

package com.example.cobaxmlparser; 


import org.xml.sax.Attributes; 
import org.xml.sax.SAXException; 
import org.xml.sax.helpers.DefaultHandler; 


public class ExampleHandler extends DefaultHandler{ 

// =========================================================== 
// Fields 
// =========================================================== 

private boolean in_outertag = false; 
private boolean in_innertag = false; 
private boolean in_id_kos = false; 
private boolean in_nama = false; 
private boolean in_latitude = false; 
private boolean in_longitude = false; 
private boolean in_harga = false; 
private boolean in_tampakdepan = false; 
private boolean in_streetview = false; 
private boolean in_alamat = false; 




private ParsedExampleDataSet myParsedExampleDataSet = new ParsedExampleDataSet(); 

// =========================================================== 
// Getter & Setter 
// =========================================================== 

public ParsedExampleDataSet getParsedData() { 
    return this.myParsedExampleDataSet; 
} 

// =========================================================== 
// Methods 
// =========================================================== 
@Override 
public void startDocument() throws SAXException { 
    this.myParsedExampleDataSet = new ParsedExampleDataSet(); 
} 

@Override 
public void endDocument() throws SAXException { 
    // Nothing to do 
} 

/** Gets be called on opening tags like: 
* <tag> 
* Can provide attribute(s), when xml was like: 
* <tag attribute="attributeValue">*/ 
@Override 
public void startElement(String namespaceURI, String localName, 
     String qName, Attributes atts) throws SAXException { 
    if(localName.equals("xml")) 
    { 
     this.in_outertag = true; 
    } 
    else if (localName.equals("item")) { 
     this.in_innertag = true; 

    }else if (localName.equals("id_kos")) { 
     this.in_id_kos = true; 
    }else if (localName.equals("nama")) 
    { 
     this.in_nama = true; 
    }else if (localName.equals("alamat")) 
    { 
     this.in_alamat = true; 
    }else if (localName.equals("latitude")) 
    { 
     this.in_latitude = true; 
    }else if (localName.equals("longitude")) 
    { 
     this.in_longitude = true; 
    }else if (localName.equals("harga")) 
    { 
     this.in_harga = true; 
    }else if (localName.equals("tampakdepan")) 
    { 
     this.in_tampakdepan = true; 
    }else if (localName.equals("streetview")) 
    { 
     this.in_streetview = true; 
    } 
    } 



/** Gets be called on closing tags like: 
* </tag> */ 
@Override 
public void endElement(String namespaceURI, String localName, String qName) 
     throws SAXException { 
    if(localName.equals("xml")) 
    { 
     this.in_outertag = false; 
    } 
    else if (localName.equals("item")) { 
     this.in_innertag = false; 

    }else if (localName.equals("id_kos")) { 
     this.in_id_kos = false; 
    }else if (localName.equals("nama")) 
    { 
     this.in_nama = false; 
    }else if (localName.equals("alamat")) 
    { 
     this.in_alamat = false; 
    }else if (localName.equals("latitude")) 
    { 
     this.in_latitude = false; 
    }else if (localName.equals("longitude")) 
    { 
     this.in_longitude = false; 
    }else if (localName.equals("harga")) 
    { 
     this.in_harga = false; 
    }else if (localName.equals("tampakdepan")) 
    { 
     this.in_tampakdepan = false; 
    }else if (localName.equals("streetview")) 
    { 
     this.in_streetview = false; 
    } 

} 

/** Gets be called on the following structure: 
* <tag>characters</tag> */ 
@Override 
public void characters(char ch[], int start, int length) { 
    if(this.in_id_kos){ 
     myParsedExampleDataSet.setId_kos(new String(ch, start, length)); 
    }if(this.in_nama){ 
     myParsedExampleDataSet.setNama(new String(ch, start, length)); 
    }if(this.in_alamat){ 
     myParsedExampleDataSet.setAlamat(new String(ch, start, length)); 
    }if(this.in_latitude){ 
     myParsedExampleDataSet.setLatitude(new String(ch, start, length)); 
    }if(this.in_longitude){ 
     myParsedExampleDataSet.setLongitude(new String(ch, start, length)); 
    }if(this.in_harga){ 
     myParsedExampleDataSet.setHarga(new String(ch, start, length)); 
    }if(this.in_tampakdepan){ 
     myParsedExampleDataSet.setTampakdepan(new String(ch, start, length)); 
    }if(this.in_streetview){ 
     myParsedExampleDataSet.setStreetview(new String(ch, start, length)); 
    } 
}

}

，并从上面的代码，我只能得到最后一个项目任何帮助将真正伟大的最后一个ParsedExampleDataSet.java

public class ParsedExampleDataSet 
{ 
private String id_kos = null; 
private String nama = null; 
private String alamat = null; 
private String latitude = null; 
private String longitude = null; 
private String harga = null; 
private String tampakdepan = ""; 
private String streetview = ""; 

public String getId_kos() { 
return id_kos; 
} 
public void setId_kos(String id_kos) { 
this.id_kos = id_kos; 
} 
public String getNama() { 
return nama; 
} 
public void setNama(String nama) { 
    this.nama = nama; 
} 


public String getAlamat() { 
return alamat; 
} 
public void setAlamat(String alamat) { 
this.alamat = alamat; 
} 
public String getLatitude() { 
return latitude; 
} 
public void setLatitude(String latitude) { 
    this.latitude = latitude; 
} 


public String getLongitude() { 
    return longitude; 
} 


public void setLongitude(String longitude) { 
    this.longitude = longitude; 
} 


public String getHarga() { 
    return harga; 
} 


public void setHarga(String harga) { 
    this.harga = harga; 
} 


public String getTampakdepan() { 
    return tampakdepan; 
} 


public void setTampakdepan(String tampakdepan) { 
    this.tampakdepan = tampakdepan; 
} 


public String getStreetview() { 
    return streetview; 
} 


public void setStreetview(String streetview) { 
    this.streetview = streetview; 
} 

public String toString(){ 


    return "id_kos "+this.id_kos+" nama "+this.nama+" alamat "+this.alamat+" latitude "+this.latitude+" longitude "+this.longitude+" harga "+this.harga+" tampak depan "+this.tampakdepan+" street view "+this.streetview; 
}

}

。我是新来的机器人，并为我的坏英语感到抱歉。谢谢

答

试试这个..

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

import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.ParserConfigurationException; 

import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.Node; 
import org.w3c.dom.NodeList; 
import org.xml.sax.InputSource; 
import org.xml.sax.SAXException; 

import android.os.AsyncTask; 
import android.os.Build; 
import android.os.Bundle; 
import android.annotation.TargetApi; 
import android.app.Activity; 
import android.app.ProgressDialog; 
import android.view.Menu; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class MainActivity extends Activity { 

    String url = "http://www.rahmanrahim.com/webservicekos/allkos"; 
    ProgressDialog pDialog; 

    ArrayList<String> hasilXml = new ArrayList<String>(); 

    ListView view; 

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

     view = (ListView) findViewById(R.id.view); 
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) 
      new XmlParsing(url).executeOnExecutor(
        AsyncTask.THREAD_POOL_EXECUTOR, new String[] { null }); 
     else 
      new XmlParsing(url).execute(new String[] { null }); 

    } 

    @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; 
    } 

    public class XmlParsing extends AsyncTask<String, Void, String> { 

     // variables passed in: 
     String urls; 

     // constructor 
     public XmlParsing(String urls) { 
      this.urls = urls; 
     } 

     @Override 
     protected void onPreExecute() { 
      pDialog = ProgressDialog.show(NetActivity.this, 
        "Fetching Details..", "Please wait...", true); 
     } 

     @Override 
     protected String doInBackground(String... params) { 
      // TODO Auto-generated method stub 

      URL url; 
      try { 

       url = new URL(urls); 
       DocumentBuilderFactory dbf = DocumentBuilderFactory 
         .newInstance(); 
       DocumentBuilder db = dbf.newDocumentBuilder(); 
       Document doc = db.parse(new InputSource(url.openStream())); 

       doc.getDocumentElement().normalize(); 

       NodeList nodeList = doc.getElementsByTagName("item"); 

       for (int i = 0; i < nodeList.getLength(); i++) { 

        Node node = nodeList.item(i); 

        Element fstElmnt = (Element) node; 
        NodeList nameList = fstElmnt.getElementsByTagName("id_kos"); 
        Element nameElement = (Element) nameList.item(0); 
        nameList = nameElement.getChildNodes(); 

        System.out.println("id_kos : " 
          + ((Node) nameList.item(0)).getNodeValue()); 

        Element fstElmnt1 = (Element) node; 
        NodeList nameList1 = fstElmnt1.getElementsByTagName("nama"); 
        Element nameElement1 = (Element) nameList1.item(0); 
        nameList1 = nameElement1.getChildNodes(); 

        System.out.println("nama : " 
          + ((Node) nameList1.item(0)).getNodeValue()); 

        Element fstElmnt2 = (Element) node; 
        NodeList nameList2 = fstElmnt2 
          .getElementsByTagName("alamat"); 
        Element nameElement2 = (Element) nameList2.item(0); 
        nameList2 = nameElement2.getChildNodes(); 

        System.out.println("alamat : " 
          + ((Node) nameList2.item(0)).getNodeValue()); 

        Element fstElmnt3 = (Element) node; 
        NodeList nameList3 = fstElmnt3 
          .getElementsByTagName("latitude"); 
        Element nameElement3 = (Element) nameList3.item(0); 
        nameList3 = nameElement3.getChildNodes(); 

        System.out.println("latitude : " 
          + ((Node) nameList3.item(0)).getNodeValue()); 

        Element fstElmnt4 = (Element) node; 
        NodeList nameList4 = fstElmnt4 
          .getElementsByTagName("longitude"); 
        Element nameElement4 = (Element) nameList4.item(0); 
        nameList4 = nameElement4.getChildNodes(); 

        System.out.println("longitude : " 
          + ((Node) nameList4.item(0)).getNodeValue()); 

        Element fstElmnt5 = (Element) node; 
        NodeList nameList5 = fstElmnt5 
          .getElementsByTagName("harga"); 
        Element nameElement5 = (Element) nameList5.item(0); 
        nameList5 = nameElement5.getChildNodes(); 

        System.out.println("harga : " 
          + ((Node) nameList5.item(0)).getNodeValue()); 

        Element fstElmnt6 = (Element) node; 
        NodeList nameList6 = fstElmnt6 
          .getElementsByTagName("tampakdepan"); 
        Element nameElement6 = (Element) nameList6.item(0); 
        nameList6 = nameElement6.getChildNodes(); 

        System.out.println("tampakdepan : " 
          + ((Node) nameList6.item(0)).getNodeValue()); 

        hasilXml.add("id_kos : " 
          + ((Node) nameList.item(0)).getNodeValue() 
          + "nama : " 
          + ((Node) nameList1.item(0)).getNodeValue() 
          + "alamat : " 
          + ((Node) nameList2.item(0)).getNodeValue() 
          + "latitude : " 
          + ((Node) nameList3.item(0)).getNodeValue() 
          + "longitude : " 
          + ((Node) nameList4.item(0)).getNodeValue() 
          + "harga : " 
          + ((Node) nameList5.item(0)).getNodeValue() 
          + "tampakdepan : " 
          + ((Node) nameList6.item(0)).getNodeValue()); 
       } 

      } catch (MalformedURLException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } catch (ParserConfigurationException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } catch (SAXException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(String result) { 
      // Now we have your JSONObject, play around with it. 
      if (pDialog.isShowing()) 
       pDialog.dismiss(); 
      ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, hasilXml); 
       view.setAdapter(adapter); 
     } 

    } 
}

[Tamilan]非常感谢你的回答，我已经尝试过了，但我得到了错误，我的应用程序强制关闭，在logcat中有java.lang.NullPointerException，在COM .example.cobaxmlparser.MainActivity $ XmlParsing.onPostExecute（MainActivity.java:193） – bohr

@ user2997327哪一行是193 – Hariharan

@ user2997327发布您的Resent代码，哪行错误。 – Hariharan

答

您正在ui线程上运行网络相关的操作。

移动

HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();

到thread或AsyncTask

解析XML使用XmlPullParser。在下面的链接中有例子。

http://developer.android.com/training/basics/network-ops/xml.html

我仍然困惑，我需要改变所有的代码？如何使用AsyncTask？ – bohr

@ user2997327为什么不能看到文档有一个例子 – Raghunandan

在Android中从互联网读取XML

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