(Android™) Traverse Direct Children via FirstChild / NextSibling, or LastChild / PreviousSibling

Demonstrates some ways to iterate over direct child nodes using the FirstChild / NextSibling and LastChild / PreviousSibling methods.

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>

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ 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 {

  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 child;
    CkXml nextSibling;
    CkXml prevSibling;

    boolean success = xml.LoadXmlFile("qa_data/xml/fruit.xml");
    if (success != true) {
        Log.i(TAG, xml.lastErrorText());
        return;
        }

    // Iterate over the direct children by using FirstChild / NextSibling
    child = xml.FirstChild();
    boolean bContinue = xml.get_LastMethodSuccess();
    while ((bContinue == true)) {
        Log.i(TAG, child.tag() + " : " + child.content());
        nextSibling = child.NextSibling();
        bContinue = child.get_LastMethodSuccess();

        child = nextSibling;
        }

    Log.i(TAG, "-----");

    // Do the same, but with FirstChild2 / NextSibling2 to avoid
    // creating so many XML object instances:
    success = xml.FirstChild2();
    while (success == true) {
        Log.i(TAG, xml.tag() + " : " + xml.content());
        success = xml.NextSibling2();
        }

    // Revert back up to the parent:
    success = xml.GetParent2();

    Log.i(TAG, "-----");

    // Iterate in reverse order using LastChild / PreviousSibling
    child = xml.LastChild();
    bContinue = xml.get_LastMethodSuccess();
    while ((bContinue == true)) {
        Log.i(TAG, child.tag() + " : " + child.content());
        prevSibling = child.PreviousSibling();
        bContinue = child.get_LastMethodSuccess();

        child = prevSibling;
        }

    Log.i(TAG, "-----");

    // Do the same, but with LastChild2 / PreviousSibling2 to avoid
    // creating so many XML object instances:
    success = xml.LastChild2();
    while (success == true) {
        Log.i(TAG, xml.tag() + " : " + xml.content());
        success = xml.PreviousSibling2();
        }

    // Revert back up to the parent:
    success = xml.GetParent2();

  }

  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."
  }
}