android,Tutorial 060-1, Data, SAX XML Parser

August 18, 2011   ·   0 Comments

Tutorial 060-1, Data, SAX XML Parser

 

 

Tutorial_Data_SAXParserActivity

package com.powenko.Tutorial_Data_SAXParser;


import java.net.URL;

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

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

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

public class Tutorial_Data_SAXParserActivity extends Activity {
	
	
	private final String MY_DEBUG_TAG = "powenko.com";
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle icicle) {
		super.onCreate(icicle);

		/* Create a new TextView to display the parsingresult later. */
		TextView tv = new TextView(this);
		try {
			/* Create a URL we want to load some xml-data from. */
			URL url = new URL("http://www.powenko.com/download/example.xml");

			/* 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*/ 
			SAXHandler myExampleHandler = new SAXHandler();
			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. */
			SAXParsedExampleDataSet parsedExampleDataSet = 
									myExampleHandler.getParsedData();

			/* Set the result to be displayed in our GUI. */
			tv.setText(parsedExampleDataSet.toString());
			
		} 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);
	}
}

SAXHandler

package com.powenko.Tutorial_Data_SAXParser;


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


public class SAXHandler extends DefaultHandler{

	// ===========================================================
	// Fields
	// ===========================================================
	
	private boolean in_outertag = false;
	private boolean in_innertag = false;
	private boolean in_mytag = false;
	
	private SAXParsedExampleDataSet myParsedExampleDataSet = new SAXParsedExampleDataSet();

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

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

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

	@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("outertag")) {
			this.in_outertag = true;
		}else if (localName.equals("innertag")) {
			this.in_innertag = true;
		}else if (localName.equals("mytag")) {
			this.in_mytag = true;
		}else if (localName.equals("tagwithnumber")) {
			// Extract an Attribute
			String attrValue = atts.getValue("thenumber");
			int i = Integer.parseInt(attrValue);
			myParsedExampleDataSet.setExtractedInt(i);
		}
	}
	
	/** Gets be called on closing tags like: 
	 * </tag> */
	@Override
	public void endElement(String namespaceURI, String localName, String qName)
			throws SAXException {
		if (localName.equals("outertag")) {
			this.in_outertag = false;
		}else if (localName.equals("innertag")) {
			this.in_innertag = false;
		}else if (localName.equals("mytag")) {
			this.in_mytag = false;
		}else if (localName.equals("tagwithnumber")) {
			// Nothing to do here
		}
	}
	
	/** Gets be called on the following structure: 
	 * <tag>characters</tag> */
	@Override
    public void characters(char ch[], int start, int length) {
		if(this.in_mytag){
    		myParsedExampleDataSet.setExtractedString(new String(ch, start, length));
    	}
    }
}

SAXParsedExampleDataSet

package com.powenko.Tutorial_Data_SAXParser;


public class SAXParsedExampleDataSet {
	private String extractedString = null;
	private int extractedInt = 0;

	public String getExtractedString() {
		return extractedString;
	}
	public void setExtractedString(String extractedString) {
		this.extractedString = extractedString;
	}

	public int getExtractedInt() {
		return extractedInt;
	}
	public void setExtractedInt(int extractedInt) {
		this.extractedInt = extractedInt;
	}
	
	public String toString(){
		return "ExtractedString = " + this.extractedString
				+ "nExtractedInt = " + this.extractedInt;
	}
}

 

sample c0de:

Tutorial_Data_SAXParser

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