Process xml document from a Url : Url « Network « Android

1. Android
2. Network
3. Url

Process xml document from a Url

 
package app.test;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.GregorianCalendar;
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.NodeList;
import org.xml.sax.SAXException;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.location.Location;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.MenuItem;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;

import java.util.Date;
import java.text.SimpleDateFormat;
import android.location.Location;

 class Quake {
  private Date date;
  private String details;
  private Location location;
  private double magnitude;
  private String link;

  public Date getDate() { return date; }
  public String getDetails() { return details; }
  public Location getLocation() { return location; }
  public double getMagnitude() { return magnitude; }
  public String getLink() { return link; }
  
  public Quake(Date _d, String _det, Location _loc, double _mag, String _link) {
    date = _d;
    details = _det;
    location = _loc;
    magnitude = _mag;
    link = _link;
  }

  @Override
  public String toString() {
    SimpleDateFormat sdf = new SimpleDateFormat("HH.mm");
    return sdf.format(date) + ": " + magnitude + " " + details;
  }

}
public class Test extends Activity {
  
  static final private int QUAKE_DIALOG = 1;
  static final private int MENU_UPDATE = Menu.FIRST;
  
  ListView earthquakeListView;
  
  ArrayAdapter<Quake> aa;
  ArrayList<Quake> earthquakes = new ArrayList<Quake>();
  
  Quake selectedQuake;

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    earthquakeListView = (ListView)this.findViewById(R.id.earthquakeListView);
    earthquakeListView.setOnItemClickListener(new OnItemClickListener() {
      public void onItemClick(AdapterView<?> _av, View _v, int _index, long _id) {
        selectedQuake = earthquakes.get(_index);
        showDialog(QUAKE_DIALOG);
      }
    });

    aa = new ArrayAdapter<Quake>(getApplicationContext(), android.R.layout.simple_list_item_1, earthquakes);
    earthquakeListView.setAdapter(aa);

    refreshEarthquakes();
  }
  private void refreshEarthquakes() {
    URL url;
    try {
      url = new URL("http://earthquake.usgs.gov/eqcenter/catalogs/1day-M2.5.xml");
           
      URLConnection connection = url.openConnection(); 
         
      HttpURLConnection httpConnection = (HttpURLConnection)connection; 
      int responseCode = httpConnection.getResponseCode(); 

      if (responseCode == HttpURLConnection.HTTP_OK) { 
        InputStream in = httpConnection.getInputStream(); 
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = dbf.newDocumentBuilder();
        Document dom = db.parse(in);      
        Element docEle = dom.getDocumentElement();
        earthquakes.clear();
        NodeList nl = docEle.getElementsByTagName("entry");
        if (nl != null && nl.getLength() > 0) {
          for (int i = 0 ; i < nl.getLength(); i++) {
            Element entry = (Element)nl.item(i);
            Element title = (Element)entry.getElementsByTagName("title").item(0);
            Element g = (Element)entry.getElementsByTagName("georss:point").item(0);
            Element when = (Element)entry.getElementsByTagName("updated").item(0);
            Element link = (Element)entry.getElementsByTagName("link").item(0);

            String details = title.getFirstChild().getNodeValue();
            String hostname = "http://earthquake.usgs.gov";
            String linkString = hostname + link.getAttribute("href");

            String point = g.getFirstChild().getNodeValue();
            String dt = when.getFirstChild().getNodeValue();  
            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'hh:mm:ss'Z'");
            Date qdate = new GregorianCalendar(0,0,0).getTime();
            try {
              qdate = sdf.parse(dt);
            } catch (ParseException e) {
              e.printStackTrace();
            }

            String[] location = point.split(" ");
            Location l = new Location("dummyGPS");
            l.setLatitude(Double.parseDouble(location[0]));
            l.setLongitude(Double.parseDouble(location[1]));

            String magnitudeString = details.split(" ")[1];
            int end =  magnitudeString.length()-1;
            double magnitude = Double.parseDouble(magnitudeString.substring(0, end));
                
            details = details.split(",")[1].trim();
                
            Quake quake = new Quake(qdate, details, l, magnitude, linkString);
            addNewQuake(quake);
          }
        }
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    finally {
    }
  }
  private void addNewQuake(Quake _quake) {
    earthquakes.add(_quake);
    aa.notifyDataSetChanged();
  }
    
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {      
    super.onCreateOptionsMenu(menu);
    menu.add(0, MENU_UPDATE, Menu.NONE, "update");
    return true;
  }
            
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    super.onOptionsItemSelected(item);
          
    switch (item.getItemId()) {
      case (MENU_UPDATE): {
        refreshEarthquakes();
        return true; 
      }
    } 
    return false;
  }
    
  @Override
  public Dialog onCreateDialog(int id) {
    switch(id) {
      case (QUAKE_DIALOG) :        
        LayoutInflater li = LayoutInflater.from(this);
        View quakeDetailsView = li.inflate(R.layout.row, null);
  
        AlertDialog.Builder quakeDialog = new AlertDialog.Builder(this);
        quakeDialog.setTitle("Quake Time");         
        quakeDialog.setView(quakeDetailsView);
        return quakeDialog.create();
    }
    return null;
  }
       
  @Override
  public void onPrepareDialog(int id, Dialog dialog) {
    switch(id) {
      case (QUAKE_DIALOG) :                  
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
        String dateString = sdf.format(selectedQuake.getDate()); 
        String quakeText = "Mangitude " + selectedQuake.getMagnitude() + "\n" 
                           + selectedQuake.getDetails()  + "\n" + selectedQuake.getLink();          
          
        AlertDialog quakeDialog = (AlertDialog)dialog;
        quakeDialog.setTitle(dateString);
      
        TextView tv = (TextView)quakeDialog.findViewById(R.id.quakeDetailsTextView);
        if (tv != null)
          tv.setText(quakeText);

        break;
    }
  }
}

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent">
  <ListView
    android:id="@+id/earthquakeListView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
  />
</LinearLayout>

//row.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:padding="10sp">
  <TextView
    android:id="@+id/quakeDetailsTextView"
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:textSize="14sp"
    android:autoLink="all"      
  />
</LinearLayout>

   
  

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