Since it is written on processing help that XMLElement is deprecated, I used XML class. And I could read my xml file successfully using this code on Standard processing mode. Whenever I tried Android mode, and run the app on I got this error:
FATAL EXCEPTION: Animation Thread
java.lang.NoClassDefFoundError: processing.core.XML
    at processing.android.test.game_xml_parser.game_xml_parser.setup(game_xml_parser.java:42)
    at processing.core.PApplet.handleDraw(Unknown Source)
    at processing.core.PGraphicsAndroid2D.requestDraw(Unknown Source)
    at processing.core.PApplet.run(Unknown Source)
    at java.lang.Thread.run(Thread.java:1020)


For android version I changed my code as follows:

1. XML xmlFile;
2. xmlFile = new XML(this, "/sdcard/test/deneme.xml");
   
3. XML [] messages = xmlFile.getChildren();
4.      print("TIMESTAMP= " + messages[0].getChild("timestamp").getContent()); 

Any suggestions why this happened and how to solve it, how to read an XML file on android?

Thanks,