Android tutorial - XML Parsing in Android | Domparser - android app development - android studio - android development tutorial



 dom parser of xml parsing

What is XML Parsing?

  • Parsing XML refers to going through XML document to access data or to modify data in one or other way.
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What is DOM Parser?

  • The Document Object Model is an official recommendation of the World Wide Web Consortium (W3C).
  • It defines an interface that enables programs to access and update the style, structure and contents of XML documents.
  • XML parsers that support the DOM implement that interface.
  • We can parse the xml document by dom parser also. It can be used to create and parse the xml file.
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usage of dom?

  • You should use a DOM parser when:
  • You need to know a lot about the structure of a document
  • You need to move parts of the document around (you might want to sort certain elements, for example)
  • You need to use the information in the document more than once
 xml parsing of android

Advantage of DOM Parser over SAX

  • It can be used to create and parse the xml file both but SAX parser can only be used to parse the xml file.

Disadvantage of DOM Parser over SAX

  • It consumes more memory than SAX.

Example of android DOM Xml parsing

activity_main.xml

  • Drag the one textview from the pallete. Now the activity_main.xml file will look like this:
  • File: activity_main.xml
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<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".MainActivity" >  
  
    <TextView  
        android:id="@+id/textView1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentLeft="true"  
        android:layout_alignParentTop="true"  
        android:layout_marginLeft="75dp"  
        android:layout_marginTop="46dp"  
        android:text="TextView" />  
  
</RelativeLayout>  
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xml document

  • Create an xml file named file.xml inside the assets directory of your project.
  • File: file.xml
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<?xml version="1.0"?>  
<records>  
<employee>  
<name>Sachin Kumar</name>  
<salary>50000</salary>  
</employee>  
<employee>  
<name>Rahul Kumar</name>  
<salary>60000</salary>  
</employee>  
<employee>  
<name>John Mike</name>  
<salary>70000</salary>  
</employee>  
</records>  
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Activity class

  • Let's write the code to parse the xml using dom parser.
  • File: MainActivity.java
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package com.wikitechy.domxmlparsing;  
import java.io.InputStream;  
  
import javax.xml.parsers.DocumentBuilder;  
import javax.xml.parsers.DocumentBuilderFactory;  
import org.w3c.dom.Document;  
import org.w3c.dom.Element;  
import org.w3c.dom.Node;  
import org.w3c.dom.NodeList;  
import android.app.Activity;  
import android.os.Bundle;  
import android.widget.TextView;  
  
public class MainActivity extends Activity {  
TextView tv1;  
  
@Override  
public void onCreate(Bundle savedInstanceState) {  
super.onCreate(savedInstanceState);  
setContentView(R.layout.activity_main);  
tv1=(TextView)findViewById(R.id.textView1);  
try {  
InputStream is = getAssets().open("file.xml");  
  
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();  
DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();  
Document doc = dBuilder.parse(is);  
  
Element element=doc.getDocumentElement();  
element.normalize();  
  
NodeList nList = doc.getElementsByTagName("employee");  
for (int i=0; i<nList.getLength(); i++) {  
  
Node node = nList.item(i);  
if (node.getNodeType() == Node.ELEMENT_NODE) {  
Element element2 = (Element) node;  
tv1.setText(tv1.getText()+"\nName : " + getValue("name", element2)+"\n");  
tv1.setText(tv1.getText()+"Salary : " + getValue("salary", element2)+"\n");  
tv1.setText(tv1.getText()+"-----------------------");  
}  
}//end of for loop  
  
} catch (Exception e) {e.printStackTrace();}  
  
}  
private static String getValue(String tag, Element element) {  
NodeList nodeList = element.getElementsByTagName(tag).item(0).getChildNodes();  
Node node = (Node) nodeList.item(0);  
return node.getNodeValue();  
}  
  
}  
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Output:

 output parsing of xml parser

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