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How to get the inner tags from an XML file?

I'm sitting there for quite a while now, trying to process my xml file (similar to the one below). I want to check all tags, if is equal to a variable, and if so, then running readEntry() on the tag.
I followed this example: https://developer.android.com/training/basics/network-ops/xml.html
I also found this Article(Difficulty with XML nested tags with XMLPullParser in Android deals with this topic.
I have already tried a few things but get either nothing or XmlPullParserException.
A Example of my XML:
<VpMobil>
<Kopf>
...
</Kopf>
<FreieTage>
...
</FreieTage>
<Klassen>
<Kl>
<Kurz>5</Kurz>
<Pl>
<Std>
<St>1</St>
<Fa>Fa1</Fa>
<Le>NAME</Le>
<Ra>1009</Ra>
<Nr>131</Nr>
<If/>
</Std>
<Std>
<St>2</St>
<Fa>Fa2</Fa>
<Le>NAME</Le>
<Ra>1004</Ra>
<Nr>132</Nr>
<If/>
</Std>
</Pl>
</Kl>
<Kl>
<Kurz>6</Kurz>
<Pl>
<Std>
<St>1</St>
<Fa>Fa2</Fa>
<Le>NAME</Le>
<Ra>1046</Ra>
<Nr>131</Nr>
<If/>
</Std>
<Std>
<St>2</St>
<Fa>Fa3</Fa>
<Le>NAME</Le>
<Ra>1012</Ra>
<Nr>132</Nr>
<If/>
</Std>
</Pl>
</Kl>
</Klassen>
</VpMobil>
I would be very grateful if someone could explain to me how I can achieve this. Thanks in advance

You can use Jackson library to parse XML, it is as easy as parsing Json File. this tuto will help you to figure out.
However, bescause it is is a nested xml, you will need some nested POJOs to achieve parsing.

After a few more unsuccessful attempts, I got the idea to convert the XML into a JSON (Convert XML to JSON object in Android) and continue working with it. That worked then.

XML Parser in android

I need to know what is the best way to parsing XML file in android, I know there is 3 parser (XMLPullParser, Dom Parser and Sax parser) so whats the different between it and if there any code to do that.

Sax Parser : Simple API of XML Parse node to node, using top-down traversing, parse without storing xml, Faster compared to Dom Manipulating of node like insertion or deletion is allowed. Needs SAXParserFactory
Dom Parser : Document Object Model Stores entire xml in memory before processing, traverse in any direction, Manipulating of node like insertion or deletion is NOT allowed. Needs DocumentBuilderFactory
Pull Parser: It provides more control and speed from the above two.

Android training recommends XMLPullParser.
http://developer.android.com/training/basics/network-ops/xml.html
We recommend XmlPullParser, which is an efficient and maintainable way to parse XML on Android.
They also give some code examples.

Android XML parsing

I have a problem with parsing xml by an android, a document that is parsed well with Java EE, do not want parsed into an android. Using SAX. Maybe someone encountered this problem.

i had real truble with this too...
For getting xml document to string, i'm using this library:
http://wurstgranulat.de/projekte/java-library-android-xml-document-string/
fo creating document i use dom parser:
http://www.java.happycodings.com/XML/code17.html

Xml parsing in android

In android app, i want to send a php requeset, and am expecting a response in the form of xml, from the server.
Can anybody provide pointers in this case.

You can use XmlPullParser bundled with android to parse the response. To get the parser instance use this snippet:
XmlPullParser pullParser = XmlPullParserFactory.newInstance().newPullParser();
pullParser.setInput(...); //Set input source with response you parsing.

There are 3 methods for parsing XMl in android. See working with xml in android.

You may want to try out my XmlParsing library.
https://github.com/frenchie4111/XmlParser
Let me know if you have any problems with it.

Xstream is your friend http://x-stream.github.io/
XStream is a simple library to serialize objects to XML and back again.

How to encode XML on Android?

I need to encode an XML document into a format that will pass through an XML parser as a string (i.e. strip tags). I then need to decode it back again and I need to do this on Android. What is the library/class in the Android API that I'm looking for?
Thanks

XmlSerializer is probably what you want. Use it to build the "outer" XML document; you can give its text(...) method an intact XML string and it will do the escaping for you. You can do the same kind of thing with the DOM API by using setTextContent if you really want to build a DOM tree and then dump that to XML. As you appear to be aware, any XML parser will properly decode the entity references when you ask for the text back.
If you really want to write your own XML-building code, you might try pulling in the Apache commons-lang library into your project for it's StringEscapeUtils class. I'm not aware of anything that will just do the entity substitution without building real XML in the base Android API.
For an example, try this:
XmlSerializer xs = Xml.newSerializer();
StringWriter sw = new StringWriter();
xs.setOutput(sw);
xs.startDocument(null, null);
xs.startTag(null, "foo");
xs.text("<bar>this is some complete XML document you had around before</bar>");
xs.endTag(null, "foo");
xs.endDocument();
Log.v("XMLTest", "Generated XML = " + sw.toString());

I ended up using URLEncoder/URLDecoder, which seems to work nicely.
String encoded = URLEncoder.encode(xml);

The general Java XML Parser is the way to go.
and if you have to build it up manually you can use the XmlSerializer
edit:
Here is an article about working with xml on android, but It uses the XmlSerializer for the writing also

this question is one of the first results, when I searched the solution to this problem, so I answer here
Html.fromHtml(String)