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