(Chilkat for Android™ API)
Removing / Deleting Child Nodes from XML

Demonstrates various methods for removing child nodes from an XML document.

The input XML, available at http://www.chilkatsoft.com/data/fruit.xml, is this:

<root>
    <fruit color="red">apple</fruit>
    <fruit color="green">pear</fruit>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <fruit color="purple">grape</fruit>
    <cheese color="yellow">cheddar</cheese>
</root>

Download: Chilkat for Android™ Java Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {
  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    TextView tv = new TextView(this);
    String outStr = "";

    CkXml xml = new CkXml();
    CkXml xyz;

    boolean success;
    //  The sample input XML is available at http://www.chilkatsoft.com/data/fruit.xml
    success = xml.LoadXmlFile("fruit.xml");
    if (success != true) {
        outStr += xml.lastErrorText() + "\n";
        tv.setText(outStr);
        setContentView(tv);
        return;
    }

    //  The RemoveChild method removes (discards) all direct
    //  children having the specified tag:
    xml.RemoveChild("fruit");

    //  Show the resulting XML:
    outStr += "Result with all direct children having a tag equal to \"fruit\" removed:" + "\n";
    outStr += xml.getXml() + "\n";

    //  The XML with the "fruit" direct children removed is shown below:
    //  Notice that the "fruit" node beneath "xyz" was not removed.
    //  This correct because it was not a direct child of the calling node.
    //  
<root>
    <veg color="orange">carrot</veg>
    <meat animal="cow">beef</meat>
    <xyz>
        <fruit color="blue">blueberry</fruit>
        <veg color="green">broccoli</veg>
    </xyz>
    <cheese color="yellow">cheddar</cheese>
</root>


    //  --------------------------------------------------------------------------
    //  Restore the original XML:
    success = xml.LoadXmlFile("fruit.xml");

    //  The RemoveChildWithContent method removes the child
    //  having the exact content specified, regardless of the tag.
    //  For example:
    xml.RemoveChildWithContent("pear");

    //  Show the resulting XML:
    outStr += "Result with the node containing \"pear\" removed:" + "\n";
    outStr += xml.getXml() + "\n";

    //  --------------------------------------------------------------------------
    //  Restore the original XML:
    success = xml.LoadXmlFile("fruit.xml");

    //  The RemoveChildByIndex method removes the Nth direct
    //  child.  Indexing begins at 0.  The "xyz" child is at index 4:
    xml.RemoveChildByIndex(4);

    //  Show the resulting XML:
    //  Notice that the entire "xyz" subtree is removed.
    outStr += "Result with the node at index 4 removed:" + "\n";
    outStr += xml.getXml() + "\n";

    //  --------------------------------------------------------------------------
    //  Restore the original XML:
    success = xml.LoadXmlFile("fruit.xml");

    //  Navigate to the node with tag "xyz"
    xyz = xml.FindChild("xyz");

    //  Remove the "xyz" subtree making it it's own XML document
    //  with the "xyz" node at the root:
    xyz.RemoveFromTree();

    //  Show both XML documents:
    outStr += xyz.getXml() + "\n";
    outStr += xml.getXml() + "\n";

    //  Also, the TreeId property is an integer value assigned
    //  to nodes in an XML document.  All nodes belonging to
    //  the same XML document will have the same TreeId.
    //  Notice that the "xyz" node now has a different TreeId:
    outStr += "xyz TreeId = " + xyz.get_TreeId() + "\n";
    outStr += "xml TreeId = " + xml.get_TreeId() + "\n";


    tv.setText(outStr);
    setContentView(tv);
  }

  static {
      // Important: Make sure the name passed to loadLibrary matches the shared library
      // found in your project's libs/armeabi directory.
      //  for "libchilkat.so", pass "chilkat" to loadLibrary
      //  for "libchilkatemail.so", pass "chilkatemail" to loadLibrary
      //  etc.
      // 
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}