To accomplish the parsing, we are going to use a SAX-Parser (Wiki-Info). SAX stands for "Simple API for XML", so it is perfect for us
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1 Description: 0.) In this tutorial we are going to parse the following XML-File located at the following url: : XML: <?xml version="1.0"?> <outertag> <innertag sampleattribute="innertagattribute"> <mytag> anddev.org rulez =) </mytag> <tagwithnumber thenumber="1337"/> </innertag> </outertag> To accomplish the parsing, we are going to use a SAX-Parser (Wiki-Info). SAX stands for "Simple API for XML", so it is perfect for us 1.) Lets take a look at the oncreate(...)-method. It will open an URL, create a SAXParser, add a ContentHandler to it, parse the URL and display the Results in a TextView. /** Called when the activity is first created. */ 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(" /* 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*/ ExampleHandler myexamplehandler = new ExampleHandler(); xr.setcontenthandler(myexamplehandler);
2 /* 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. */ ParsedExampleDataSet 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); 2.) The next Class to take a look at is the ExampleHandler which extends org.xml.sax.helpers.defaulthandler. A SAX-Handler is an really easy class. We will just need to implement some trivial functions. The SAXParser will 'walk' through the XML-File from the beginning to the end and always, when it reaches an opening tag like: XML: <outertag> the Handler-Function: public void startelement(string namespaceuri, String localname, String qname, Attributes atts) throws SAXException { gets called. Where in this case localname will be "outertag". The same happens on closing tags, like: XML: </outertag>
3 Here the equivalent 'closing'-method that gets called: public void endelement(string namespaceuri, String localname, String qname) throws SAXException { In XML you can put any characters you want between a opening and an closing tag, like this: XML: <mytag> anddev.org rulez =) </mytag> When the Parser reaches such a Tag, the following method gets called, providing the characters between the opening and the closing tag: /** Gets be called on the following structure: * <tag>characters</tag> */ public void characters(char ch[], int start, int length) { String textbetween = new String(ch, start, length); Finally on the start/end of each document the following functions get called: public void startdocument() throws SAXException { Do some startup if needed public void enddocument() throws SAXException { Do some finishing work if needed 3.) What was shown up to here was just the basic structure of the SAX-Handler. Now I'll show you the standard way of a real-life Handler-Implementation. This is also pretty simple. We probably want to know how 'deep' the Parser has parsed so far, so we create some booleans indicating which tags are still open. This is done like the following:
4 Fields private boolean in_outertag = false; private boolean in_innertag = false; private boolean in_mytag = false; As we know, when the parser reaches an opening-tag the startelement(...)-method gets called: So we will simply check the localname and set the corresponding "in_xyz"-boolean to true. 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")) { String attrvalue = atts.getvalue("thenumber"); int i = Integer.parseInt(attrValue); myparsedexampledataset.setextractedint(i); Similiar on closing tags the endelement(..)-method gets called and we just set the "in_xyz"-boolean back to false: 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;
5 else if (localname.equals("mytag")) { this.in_mytag = false; else if (localname.equals("tagwithnumber")) { Nothing to do here So for example when the Parser reaches the following part: XML: <mytag> anddev.org rulez =) </mytag> Our "in_xyz"-booleans indicate in which tag these characters have been 'detected' and easily extract them: /** Gets be called on the following structure: * <tag>characters</tag> */ public void characters(char ch[], int start, int length) { if(this.in_mytag){ myparsedexampledataset.setextractedstring(new String(ch, start, length)); 4.) What I prefer is to make the Handler create a nice object that gets created during the whole parsing and when parsing has finished I can simply grab the created Object: public ParsedExampleDataSet getparseddata() { return this.myparsedexampledataset; So now you know how to properly use the SAXParser together with the SAXHandler If any question remained feel free to ask The Full Source: "/src/your_package_structure/parsingxml.java"
6 package org.anddev.android.parsingxml; 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 ParsingXML extends Activity { private final String MY_DEBUG_TAG = "WeatherForcaster"; /** Called when the activity is first created. */ 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(" /* 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*/ ExampleHandler myexamplehandler = new ExampleHandler(); xr.setcontenthandler(myexamplehandler); /* Parse the xml-data from our URL. */
7 xr.parse(new InputSource(url.openStream())); /* Parsing has finished. */ /* Our ExampleHandler now provides the parsed data to us. */ ParsedExampleDataSet 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); "/src/your_package_structure/examplehandler.java" package org.anddev.android.parsingxml; import org.xml.sax.attributes; import org.xml.sax.saxexception; import org.xml.sax.helpers.defaulthandler; public class ExampleHandler extends DefaultHandler{ Fields private boolean in_outertag = false; private boolean in_innertag = false; private boolean in_mytag = false; private ParsedExampleDataSet myparsedexampledataset = new
8 ParsedExampleDataSet(); Getter & Setter public ParsedExampleDataSet getparseddata() { return this.myparsedexampledataset; Methods public void startdocument() throws SAXException { this.myparsedexampledataset = new ParsedExampleDataSet(); 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">*/ 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);
9 myparsedexampledataset.setextractedint(i); /** Gets be called on closing tags like: * </tag> */ 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> */ public void characters(char ch[], int start, int length) { if(this.in_mytag){ myparsedexampledataset.setextractedstring(new String(ch, start, length)); "/src/your_package_structure/parsedexampledataset.java" package org.anddev.android.parsingxml; public class ParsedExampleDataSet { private String extractedstring = null; private int extractedint = 0; public String getextractedstring() { return extractedstring; public void setextractedstring(string extractedstring) {
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