Android Open Source - maps sax Handler

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License

The source code is released under:

GNU General Public License

Java Source Code

package edu.cs4730.MapDemo;
/*from  ww  w .j  av  a2  s . c  om*/
import android.util.Log;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

/*
 * This parser is ignoring a large about of data in the kml file.
 * But otherwise, it create a dataset to placed on a map.
 * 
 * Bases of this code comes from http://codemagician.wordpress.com/2010/05/06/android-google-mapview-tutorial-done-right/
 * There was more then a bit of modification though.
 */

public class saxHandler extends DefaultHandler{ 

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

    private boolean in_kmltag = false; 
    private boolean in_placemarktag = false; 
    private boolean in_nametag = false;
    private boolean in_descriptiontag = false;
    private boolean in_geometrycollectiontag = false;
    private boolean in_linestringtag = false;
    private boolean in_pointtag = false;
    private boolean in_coordinatestag = false;

    private StringBuffer buffer;

    private dataSet DataSet = new dataSet(); 

    private Placemark tmp = null;
    
    // =========================================================== 
    // Getter 
    // =========================================================== 

    public dataSet getParsedData() {    
      return DataSet; 
    } 

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

    @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 { 
      Log.d("SaxHandler","startElement is "+localName);
      if (localName.equals("kml")) { 
        this.in_kmltag = true;
      } else if (localName.equals("Placemark")) { 
        this.in_placemarktag = true; 
        tmp = new Placemark();  //begin building the placemark to be added to the dataset.
      } else if (localName.equals("name")) { 
        this.in_nametag = true;
      } else if (localName.equals("description")) { 
        this.in_descriptiontag = true;
      } else if (localName.equals("GeometryCollection")) {   //don't care...
        this.in_geometrycollectiontag = true;
      } else if (localName.equals("LineString")) { //don't care...
        this.in_linestringtag = true;              
      } else if (localName.equals("point")) { //don't care...
        this.in_pointtag = true;          
      } else if (localName.equals("coordinates")) {
        buffer = new StringBuffer();
        this.in_coordinatestag = true;                        
      }
    } 

    /** Gets be called on closing tags like: 
     * </tag> */ 
    @Override 
    public void endElement(String namespaceURI, String localName, String qName) 
    throws SAXException { 
      if (localName.equals("kml")) {
        this.in_kmltag = false;  //we are done!
      } else if (localName.equals("Placemark")) { 
        this.in_placemarktag = false;
        //end of a group, start over
        DataSet.addPlacemark(tmp);
        tmp = null;
      } else if (localName.equals("name")) { 
        this.in_nametag = false;           
      } else if (localName.equals("description")) { 
        this.in_descriptiontag = false;
      } else if (localName.equals("GeometryCollection")) {  // don't have any
        this.in_geometrycollectiontag = false;
      } else if (localName.equals("LineString")) { //should not have any...
        this.in_linestringtag = false;              
      } else if (localName.equals("point")) {  //should not have any...
        this.in_pointtag = false;          
      } else if (localName.equals("coordinates")) {
        tmp.setCoordinates(buffer.toString().trim());
        Log.d("SaxHandler","Coor: "+tmp.getCoordinates());
        this.in_coordinatestag = false;
        buffer = null;
      }
    } 

    /** Gets be called on the following structure: 
     * <tag>characters</tag> */ 
    @Override 
    public void characters(char ch[], int start, int length) { 
      if(this.in_nametag){  //attempt to deal with bad xml? 
        if (tmp ==null) 
          tmp = new Placemark();
        tmp.setTitle(new String(ch, start, length));  
        Log.d("SaxHandler","name is "+tmp.getTitle());
      } else   if(this.in_descriptiontag){ 
        if (tmp==null) 
          tmp = new Placemark();
        tmp.setDescription(new String(ch, start, length));
        //Log.d("SaxHandler","name is "+tmp.getDescription());  Not sure I care actually...
      } else if(this.in_coordinatestag){        
        if (tmp==null) 
          tmp=new Placemark();
        //maybe on several lines, so add to the buffer, when ends, then place it in tmp.
        buffer.append(ch, start, length);          
        //Log.d("SaxHandler","buffer:"+buffer);
      }
    } 
}

Java Source Code List

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