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(Android™) Removing / Deleting Child Nodes from XMLDemonstrates 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>
// 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 { private static final String TAG = "Chilkat"; // Called when the activity is first created. @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); 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) { Log.i(TAG, xml.lastErrorText()); return; } // The RemoveChild method removes (discards) all direct // children having the specified tag: xml.RemoveChild("fruit"); // Show the resulting XML: Log.i(TAG, "Result with all direct children having a tag equal to \"fruit\" removed:"); Log.i(TAG, xml.getXml()); // 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: Log.i(TAG, "Result with the node containing \"pear\" removed:"); Log.i(TAG, xml.getXml()); // -------------------------------------------------------------------------- // 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. Log.i(TAG, "Result with the node at index 4 removed:"); Log.i(TAG, xml.getXml()); // -------------------------------------------------------------------------- // 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: Log.i(TAG, xyz.getXml()); Log.i(TAG, xml.getXml()); // 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: Log.i(TAG, "xyz TreeId = " + String.valueOf(xyz.get_TreeId())); Log.i(TAG, "xml TreeId = " + String.valueOf(xml.get_TreeId())); } static { 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." } } |
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