Develop Reference

How to get sub elements of an xml in android?

InputStream is = openHTTPConnection("blahblah");
DocumentBuilderFactory fac = DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
Document doc = null;
try {
builder = fac.newDocumentBuilder();
doc = builder.parse(is);
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (SAXException e) {
e.printStackTrace();
}
doc.getDocumentElement().normalize();
NodeList parentNodes = doc.getElementsByTagName("Parent");
for (int i = 0; i < parentNodes.getLength(); i++){
Node itemNode = parentNodes.item(i);
if (itemNode.getNodeType() == Node.ELEMENT_NODE){
Element parentElement = (Element) itemNode;
NodeList childNodes = ??????
}
}
My XML file:
<Blah>
<Parent>
<Child>
...
</Child>
</Parent>
</Blah>
How can I get the sub element of Parent? The tutorial says NodeList childNodes = (parentElement).getElementsByTagName("Child"); But it does not make sense to me.
It looks like my post is mostly code; But I don't know what to add

Tutorial is correct. This is how you get it:
NodeList childNodes = (parentElement).getElementsByTagName("Child");
Element childElement=(Element)childNodes.item[0];
In case , there are multiple <child> nodes, you can loop through the iterator

In this way you can get sub elements of an xml in android
You could write a xsl
<xsl:template match="/">
<xsl:for-each select="section">
<xsl:value-of select="concat('link ',photo#id, ' from ',#name,' is ',photo#ilink)"><xsl:value-of>
</xsl:for-each>
</xsl:template>
run the xsl on your xml, the output will be link 1 from section1 is ImageLink 1 .. link 4 from section2 is ImageLink 2

How can i parse XML using pull parser in Android

I have XML:
<?xml version="1.0" encoding="UTF-8"?>
<categories type="array">
<category>
<category_id>8</category_id>
<category_name>Công Nghệ & Xe</category_name>
<category_code>cong-nghe-xe</category_code>
<subcategory>
<category_id>59</category_id>
<category_name>Kiến trúc - thủ thuật</category_name>
<category_code>cong-nghe-xe_kien-thuc-thu-thuat</category_code>
</subcategory>
.................................................
</category>
.................................................
</categories>
How can I read it and fill ListView in Android, and what should I do : DOM , XML Parser or SAX ??

I prefer DOM for small little snippets like this.
String xml;
Document doc;
Element root = null;
try {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
doc = builder.parse( new InputSource( new StringReader( xml ) ) );
root = doc.getDocumentElement();
} catch ( Exception e ) {
// do something
}
if( root != null ) {
NodeList cats = root.getElementsByTagName( "category" );
for( int i=0; i < cats.getLength(); i++ ) {
Element category = (Element)cats.item( i );
....
}
}

Have you tried the example of Android?
http://developer.android.com/training/basics/network-ops/xml.html

How to modify XML node value?

I am new developer in java application. I would like to modify an XML file node value. I have used an xml file for modify as follows
<staff id="2">
<firstname>yong</firstname>
<lastname>mook kim</lastname>
<nickname>mkyong</nickname>
<salary>2000000</salary>
<age>28</age>
</staff>
in above xml I would like to change salary value as 345375. For this modification I have written code as follows
try{
DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
Document doc = docBuilder.parse(new File("/sdcard/myxml.xml"));
//Get the staff element by tag name directly
Node nodes = doc.getElementsByTagName("staff").item(0);
//loop the staff child node
NodeList list = nodes.getChildNodes();
for (int i =0; i<list.getLength();i++){
Node node = list.item(i);
//get the salary element, and update the value
if("salary".equals(node.getNodeName())){
node.setNodeValue("345375");
}
}
}
catch (Exception e) {
e.printStackTrace();
}
if I use this way that value not modifying salary.
How can I modify an XML node value?

First you have to realize that node.setValue() is modifying the representation that is stored in memory. Knowing that, then you just need to figure out how to write that output to disk. See this, for an example.

node.Text = "Enter your value here"; //This will work

parsing does not working in android

I am parsing a xml from an url.The url is has mobile IMEI no and searchstring based on my application. i put my xml parsing code in android project it does not work. but if i run as separate java program it is working. please help me.
Log.e("rsport-", "function1");
try{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setIgnoringComments(true);
factory.setCoalescing(true); // Convert CDATA to Text nodes
factory.setNamespaceAware(false); // No namespaces: this is default
factory.setValidating(false); // Don't validate DTD: also default
DocumentBuilder parser = factory.newDocumentBuilder();
Log.e("rsport-", "function2");
Document document = parser.parse("http://demo.greatinnovus.com/restingspot/search?userid=xxxxxxxxxxxxxxxx&firstname=a&lastname=a");
Log.e("rsport-","function3");
NodeList sections = document.getElementsByTagName("Searchdata");
int numSections = sections.getLength();
for (int i = 0; i < numSections; i++)
{
Element section = (Element) sections.item(i);
if(section.hasChildNodes()==true){
NodeList section1=section.getChildNodes();
for(int j=0;j<section1.getLength();j++){
if(section1.item(j).hasChildNodes()==true) {
for(int k=0;k<section1.item(j).getChildNodes().getLength();k++)
xmlvalue=String.valueOf(section1.item(j).getChildNodes().item(k).getNodeValue()).trim();
arl.add(xmlvalue);
}
}
}
}
}
}
catch(Exception e){}
System.out.println("id"+id+" searchdatacount"+searchdatacount);
System.out.println("---------");
ListIterator<String> litr = arl.listIterator();
while (litr.hasNext()) {
String element = litr.next();
Log.e("rsport-", "elememt");
}
after the Log.e("rsport-", "function2"); does not work.

Refer my blog, i had gave Detailed explanation, http://sankarganesh-info-exchange.blogspot.com/2011/04/parsing-data-from-internet-and-creating.html, and make sure , that you had add the Internet permission in your Manifest file.
If you had gone through Myblog, then you will able to notice that you did the following line as wrong
Document document = parser.parse("http://demo.greatinnovus.com/restingspot/search?userid=xxxxxxxxxxxxxxxx&firstname=a&lastname=a");
use like this
URL url =new URL("http://demo.greatinnovus.com/restingspot/search?userid=xxxxxxxxxxxxxxxx&firstname=a&lastname=a");
Document document= parser.parse(new InputSource(url.openStream()));

Using DOM parser in Android

I'm using the DOM parser to retrive information from a XML file that looks like this:
<data>
<metData>
<wantedInformation>
</metData>
<metData>
<Information>
</metData>
<metData>
<Information>
</metData>
<data>
The problem is because I don't know how to parse only the first part of <metData>. I don't need the second and the third part, but the parser displays them anyway.
The xml file is from a weather forcast site:
http://www.meteo.si/uploads/probase/www/fproduct/text/sl/fcast_SLOVENIA_MIDDLE_latest.xml
and I need just the following line: <nn_shortText>oblačno</nn_shortText>

Pls take care whether your XML file is well formed or not,
You have to the notice three methods which i had shown below, they are
1. getElementsByTagName - Mention the tag which you want to parse
2.getChildNodes - retervies the child node
3.getNodeValue()- with the help of this method you can access the
value of particular tag
Step 1: Create a Method to parse _Information_Value ,inorder to parse the data of Information tag
String[] infoId=null;
public void parse_Information_Value() throws UnknownHostException{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
try {
DocumentBuilder builder = factory.newDocumentBuilder();
Document dom = builder.parse(this.getInputStream());
org.w3c.dom.Element root = dom.getDocumentElement();
NodeList items = root.getElementsByTagName("metData");
int a=items.getLength();
int k=0;
for (int i = 0; i < items.getLength(); i++) {
Message_category message = new Message_category();
Node item = items.item(i);
NodeList properties = item.getChildNodes();
for (int j = 0; j < properties.getLength(); j++) {
Node property = properties.item(j);
String name = property.getNodeName();
if (name.equalsIgnoreCase("wantedInformation")) {
message.setId(property.getFirstChild()
.getNodeValue());
infoId[k]=property.getFirstChild().getNodeValue();
k++;
}
}
}
} catch (Exception e) { }
}

Depending on the size of your document, you may also want to use at a streaming oriented parser like SAX or Stax, which does not pull the whole document into memory and thus needs less memory than DOM.
Good thing is that SAX is already built into Android, so you can use it right away.
See this link for a usage example.