Tuesday, April 23, 2013

[android help] Parse CDATA with XMLParser in this specific case for ANDROID


I've seen quite a few posts about this, but actually I did not get any to work. I am building a simple TV guide android application. I simply Use RSS from a tvprofil.net to show whats on TV today. The problem is, I do not know how to Parse CDATA in XML. I am using some standard parser with DOM... at least I think so..


This is a bit of XML:



.
.
.

RTS1 14.08.2012
Tue, 14 Aug 2012 06:00:00
06:05 Jutarnji program
08:00 Dnevnik

8:15 Jutarnji Program
09:00 Vesti ... ]]>


.
.
.


now, this is my main app:



public class Main extends ListActivity {

// All static variables
static final String URL = "http://tvprofil.net/rss/feed/channel-group-2.xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_NAME = "title";
static final String KEY_DATE = "pubDate";
static final String KEY_DESC = "content:encoded";

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


ArrayList> menuItems = new ArrayList>();



XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); //get XML
Document doc = parser.getDomElement(xml); // get DOM elem.



NodeList nl = doc.getElementsByTagName(KEY_ITEM);
//loop
for (int i=0; i< nl.getLength(); i++){
HashMap map = new HashMap();
Element e = (Element) nl.item(i);
//add to map
map.put(KEY_NAME, parser.getValue(e, KEY_NAME));
map.put(KEY_DATE, parser.getValue(e, KEY_DATE));
map.put(KEY_DESC, parser.getValue(e, KEY_DESC));

// hash => list
menuItems.add(map);
}

ListAdapter adapter = new SimpleAdapter(this, menuItems, R.layout.list_item,
new String[]{KEY_NAME, KEY_DESC, KEY_DATE}, new int[]{
R.id.name, R.id.description, R.id.date
});
setListAdapter(adapter);

//singleView
ListView lv = getListView();

lv.setOnItemClickListener(new OnItemClickListener(){
@Override
public void onItemClick(AdapterView parent, View view, int position, long id){
String name = ((TextView)view.findViewById(R.id.name)).getText().toString();
String date = ((TextView)view.findViewById(R.id.date)).getText().toString();
String description = ((TextView)view.findViewById(R.id.description)).getText().toString();

//intent
Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(KEY_NAME, name);
in.putExtra(KEY_DATE, date);
in.putExtra(KEY_DESC, description);
startActivity(in);
}
});

}

}


and the parser class:



public class XMLParser {

// constructor
public XMLParser() {

}

/**
* Getting XML from URL making HTTP request
* @param url string
* */
public String getXmlFromUrl(String url) {
String xml = null;


try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);

HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
xml = EntityUtils.toString(httpEntity);

} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// return XML
return xml;
}

/**
* Getting XML DOM element
* @param XML string
* */

public Document getDomElement(String xml){

Document doc = null;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {

DocumentBuilder db = dbf.newDocumentBuilder();

InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xml));
doc = db.parse(is);

} catch (ParserConfigurationException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (SAXException e) {
Log.e("Error: ", e.getMessage());
return null;
} catch (IOException e) {
Log.e("Error: ", e.getMessage());
return null;
}

return doc;
}

/** Getting node value
* @param elem element
*/
public final String getElementValue( Node elem ) {

Node child;
if( elem != null){
if (elem.hasChildNodes()){
for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() ){
if( child.getNodeType() == Node.TEXT_NODE ){
return child.getNodeValue();
}
}
}
}
return "";
}

/**
* Getting node value
* @param Element node
* @param key string
* */
public String getValue(Element item, String str) {
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}


there is one more class for Single menu item.. but I think it's irrelevant in this case. Now, I'd just like to see no HTML tags after parsing it and dealing with CDATA... Anyone got idea about this one?



.

stackoverflow.comm

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