Android parse Big(3MB) KML file

Android  parse Big(3MB) KML  file

For parsing big KML file  using a SAX parser
Why Sax parser?
*Parsing data speed better.
*Dom parser can’t parse a big file.
* Json also while parsing big json file too slow and some text are missing.
*So finally I happy with SaxParser .
  

Screen Shot

Activity Soure Code

This is activity class it contain user interface of app and setting adapter to Listview

package com.vj.parsingbigfile;

import java.io.IOException;

import java.util.List;

import android.os.AsyncTask;

import android.os.Bundle;

import android.app.Activity;

import android.app.Dialog;

import android.view.Menu;

import android.widget.ListView;

import android.widget.ProgressBar;

public class MainActivity extends Activity {

     

        public static List<ParsingStructure> parsingStr = null;

        ListAdap listAdpter;

        ListView listview  = null;

      @Override

      protected void onCreate(Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);

            setContentView(R.layout.activity_main);

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

            ParsingBigFileAsync parsingAsync = new ParsingBigFileAsync();

            parsingAsync.execute();

                       

      }

      @Override

      public boolean onCreateOptionsMenu(Menu menu) {

     

            getMenuInflater().inflate(R.menu.activity_main, menu);

            return true;

      }

     

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

     String  result;

     Dialog dialog;

     ProgressBar pBar ;

            @Override

            public void onPreExecute(){

                   dialog = new Dialog(MainActivity.this);

                   dialog.setTitle("Loading......");

                   dialog.show();

            }

            @Override

            protected String doInBackground(String... params) {

                   try {

                         parsingStr = SAXXMLParser.parse(getAssets().open("values.kml"));

                            result = "in";

                        } catch (IOException e) {

                              e.printStackTrace();

                              result = "out";

                        }

                       

                  return result;

            }

           

            @Override

            public void onPostExecute(String result){

                  if(result.equalsIgnoreCase("in")){

                      listAdpter = new ListAdap(MainActivity.this, R.layout.listitemview, parsingStr);

                        listview.setAdapter(listAdpter);

                        dialog.dismiss();

                  }

            }

           

      }

}

Adapter Class

This is adapter class for set all values to TextView

package com.vj.parsingbigfile;

import java.util.List;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ArrayAdapter;

import android.widget.TextView;

public class ListAdap  extends ArrayAdapter<ParsingStructure>{

      Context ctx;

      List<ParsingStructure> parsignStrList = null ;

      public ListAdap(Context context, int textViewResourceId,List<ParsingStructure> parsing) {

            super(context, textViewResourceId,parsing);

            ctx = context;

            parsignStrList = parsing;

      }

      @Override

        public View getView(int position, View convertView, ViewGroup parent) {

          LayoutInflater inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

          View rowView = inflater.inflate(R.layout.listitemview, parent, false);

          TextView  text = (TextView)rowView.findViewById(R.id.textView1);

          try {

                    text.setText( parsignStrList.get(position).getName() );

         } catch (Exception e) {

            e.printStackTrace();

         }

          return rowView;

        }

}

ParsingStructure class

This class for creating structure for XML values

package com.vj.parsingbigfile;

public class ParsingStructure {

          private String name;

          private String description;

          private String coordinates;

          public String getName() {

              return name;

          }

       

          public void setName(String name) {

              this.name = name;

          }

       

          public String getDescription() {

              return description;

          }

       

          public void setDescription(String description) {

              this.description = description;

          }

       

          public String getCoordinates() {

              return coordinates;

          }

       

          public void setCoordinates(String coordinates) {

              this.coordinates = coordinates;

              if(this.name.trim().equalsIgnoreCase("Elimbah Creek (east)"))

                  System.out.println(coordinates);

          }

}

This class for handling xml  and setting the value to structure class

package com.vj.parsingbigfile;

import java.util.ArrayList;

import java.util.List;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.SAXParseException;

import org.xml.sax.helpers.DefaultHandler;

public class SAXXMLHandler extends DefaultHandler {

    private List<ParsingStructure> parsingStructure;

    private StringBuilder tempVal;

    private ParsingStructure tempStr;

    public SAXXMLHandler() {

      parsingStructure = new ArrayList<ParsingStructure>();

    }

    public List<ParsingStructure> getParsingvalues() {

        return parsingStructure;

    }

    public void startElement(String uri, String localName, String qName,

            Attributes attributes) throws SAXException {

      

        tempVal = new StringBuilder();

        if (qName.equalsIgnoreCase("Placemark")) {

            tempStr = new ParsingStructure();

        }

    }

    public void characters(char[] ch, int start, int length)

            throws SAXException {

      if (tempVal != null) {

            for (int i=start; i<start+length; i++) {

                  tempVal.append(ch[i]);

            }

        }

    }

    public void endElement(String uri, String localName, String qName)

            throws SAXException {

        if (qName.equalsIgnoreCase("Placemark")) {

            // add it to the list

            parsingStructure.add(tempStr);

        } else if (qName.equalsIgnoreCase("name")) {

            if(tempStr != null)

                  tempStr.setName(tempVal.toString());

        } else if (qName.equalsIgnoreCase("description")) {

            if(tempStr != null)

                  tempStr.setDescription(tempVal.toString());

        } else if (qName.equalsIgnoreCase("coordinates")) {

            if(tempStr != null)

                  tempStr.setCoordinates(tempVal.toString());

        } else if(qName.equalsIgnoreCase("kml")) {

           

        }

    }

   

    public void warning(SAXParseException e) throws SAXException {

     

    }

   

    public void error(SAXParseException e) throws SAXException {

     

    }

   

    public void fatalError(SAXParseException e) throws SAXException {

   

    }

}

This class for SAX parsing(reading) from XML file .

package com.vj.parsingbigfile;

import java.io.InputStream;

import java.util.List;

import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;

import org.xml.sax.XMLReader;

public class SAXXMLParser {

    public static List<ParsingStructure> parse(InputStream is) {

        List<ParsingStructure> parsingStru = null;

        try {

            // create a XMLReader from SAXParser

            XMLReader xmlReader = SAXParserFactory.newInstance().newSAXParser()

                    .getXMLReader();

            // create a SAXXMLHandler

            SAXXMLHandler saxHandler = new SAXXMLHandler();

            // store handler in XMLReader

            xmlReader.setContentHandler(saxHandler);

            // the process starts

            xmlReader.parse(new InputSource(is));

            // get the `get list`

            parsingStru = saxHandler.getParsingvalues();

        } catch (Exception ex) {

         

        }

        return parsingStru;

    }

}