I'm trying to extract data from an Xml file, I followed this tutorial:
XmlPullParser tutorial
And now have the following code:
public void parse(InputStream is) {
// create new Study object to hold data
try {
// get a new XmlPullParser object from Factory
XmlPullParser parser = XmlPullParserFactory.newInstance().newPullParser();
// set input source
parser.setInput(is, null);
// get event type
int eventType = parser.getEventType();
// process tag while not reaching the end of document
while(eventType != XmlPullParser.END_DOCUMENT) {
switch(eventType) {
// at start of document: START_DOCUMENT
case XmlPullParser.START_DOCUMENT:
break;
// at start of a tag: START_TAG
case XmlPullParser.START_TAG:
// get tag name
String tagName = parser.getName();
Log.i("AT START TAG","AT START TAG..."+tagName);
// if <study>, get attribute: 'id'
if(tagName.equalsIgnoreCase("Date")) {
Log.i("****PARSER INFO","TAG NAME="+tagName+"...."+parser.nextText());
eventDates.add(parser.nextText());
//study.mId = Integer.parseInt(parser.getAttributeValue(null, Study.ID));
}
// if <content>
else if(tagName.equalsIgnoreCase("Name")) {
Log.i("****PARSER INFO","TAG NAME="+tagName+"...."+parser.nextText());
performanceNames.add(parser.nextText());
//study.mContent = parser.nextText();
}
// if <topic>
else if(tagName.equalsIgnoreCase("RequestURL")) {
Log.i("****PARSER INFO","TAG NAME="+tagName+"...."+parser.nextText());
eventsURLS.add(parser.nextText());
//study.mTopic = parser.nextText();
}
break;
}
// jump to next event
eventType = parser.next();
}
// exception stuffs
} catch (XmlPullParserException e) {
//study = null;
} catch (IOException e) {
//study = null;
}
// return Study object
}
For some reason, the code within the IF statements is not running even though I have made sure the tag names do equal the strings above.
What am I doing wrong?
Related
I have the following question:
Original a part of RSS file:
<item>
<title> I can get data in tag this </title>
<description><p> i don't get data in this </p></description></item>
When I read the file using StAX parser the special character '<'; . It is automatically converted to '<'. then I cannot get data in the rest of tag "<'description>'
This is my code:
public Feed readFeed() {
Feed feed = null;
try {
boolean isFeedHeader = true;
String description = "";
String title = "";
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
InputStream in = read();
XMLEventReader eventReader = inputFactory.createXMLEventReader(in);
while (eventReader.hasNext()) {
XMLEvent event = eventReader.nextEvent();
if (event.isStartElement()) {
String localPart = event.asStartElement().getName()
.getLocalPart();
switch (localPart) {
case "title":
title = getCharacterData(event, eventReader);
break;
case "description":
description = getCharacterData(event, eventReader);
break;
}
} else if (event.isEndElement()) {
if (event.asEndElement().getName().getLocalPart() == ("item")) {
FeedMessage message = new FeedMessage();
message.setDescription(description);
message.setTitle(title);
feed.getMessages().add(message);
event = eventReader.nextEvent();
continue;
}
}
}
} catch (XMLStreamException e) {
throw new RuntimeException(e);
}
return feed;}
private String getCharacterData(XMLEvent event, XMLEventReader eventReader)
throws XMLStreamException {
String result = "";
event = eventReader.nextEvent();
if (event instanceof Characters) {
result = event.asCharacters().getData();
}
return result;}
I am following the instructions at: http://www.vogella.com/tutorials/RSSFeed/article.html
The tutorial is flawed. It doesn't account for the fact that you could get multiple text events for a single block of text (which tends to happen when you have embedded entities).
In order to make your life easier, make sure you set the IS_COALESCING property to true on the XMLInputFactory before creating your XMLEventReader (this property forces the reader to combine all adjacent text events into a single event).
I have found several questions of the name question, but can't get any of them to work. What I want is to get the url of the media:thumbnail tag:
<media:thumbnail width="144" height="81" url="http://c.files.bbci.co.uk/6013/production/_88159542_3e6f2bc3-16a3-407d-9e07-62bae1fa755e.jpg"/>
Above the example of such tag
private void handleText(String text) {
String xmlText = text;
if (currentEntry != null && currentTag != null) {
if (currentTag.equals(TITLE)) {
currentEntry.setTitle(xmlText);
} else if (currentTag.equals(DESC)) {
currentEntry.setDescription(xmlText);
} else if (currentTag.equals(LINK)) {
currentEntry.setLink(xmlText);
} else if (currentTag.equals(IMAGE)) {
currentEntry.setImage("test");
}
}
}
I tried several things as:
xpp.getAttributeValue(null, "url"); and set the image as that. However I noticed that I am not even getting in that else if clause. I tried several values on the IMAGE variable like:
media:thumbnail
media
thumbnail
I have also set namespace aware:
factory.setNamespaceAware(true);
What am I doing wrong?
parser:
XmlPullParser xpp;
int eventType;
protected List<Entry> doInBackground(String... string) {
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
xpp = factory.newPullParser();
xpp.setInput(getInputStream(new URL("http://feeds.bbci.co.uk/news/technology/rss.xml?edition=uk")), "UTF_8");
eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
handleStartTag(xpp.getName());
} else if (eventType == XmlPullParser.END_TAG) {
currentTag = null;
} else if (eventType == XmlPullParser.TEXT) {
handleText(xpp.getText());
}
eventType = xpp.next();
}
} catch (Resources.NotFoundException e) {
Log.d(LOGTAG, e.getMessage());
} catch (XmlPullParserException e) {
Log.d(LOGTAG, e.getMessage());
} catch (IOException e) {
Log.d(LOGTAG, e.getMessage());
}
return entries;
}
I fixed it. I systemed out the start tags it was parsing and it showed up as: thumbnail. So I changed my IMAGE constant to have the value of "thumbnail". It never came in the thumbnail clause since the handleText method only handles found text in a tag. Since media:thumbnail has no text only attributes with values I needed to handle it in the handleStartTag method. There I could say if the current tag name equals "thumbnail" get the attribute value of url and setImage as that value.
Need your help to resolve this :
Trying to parse this xml -
<LungProtocol><configuration name="FLUS Sitting">
<segment order="1" name="left upper anterior">
<segment order="2" name="left lower anterior">
</configuration>
<configuration name="FLUS Supine">
<segment order="1" name="left upper anterior">
<segment order="2" name="left lower anterior">
</configuration></LungProtocol>
With following function -
public List<LungSegment> parse(InputStream is, String configuration) {
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(true);
XmlPullParser parser = factory.newPullParser();
segment = new LungSegment();
parser.setInput(is, null);
parser.require(XmlPullParser.START_TAG, null, "configuration");
int eventType = parser.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
String tagname = parser.getName();
switch (eventType) {
case XmlPullParser.START_TAG:
if(("configuration").equalsIgnoreCase(tagname) && parser.getAttributeValue(null, "name").equalsIgnoreCase(configuration)){
eventType = parser.next();
//eventType = parser.next();
tagname = parser.getName();
Log.v("XMLTAG", "configuration = "+configuration);
if (("segment").equalsIgnoreCase(tagname)) {
// create a new instance of segment
segment = new LungSegment();
segment.setSegmentName(parser.getAttributeValue(null, "name"));
segment.setSegmentOrder(Integer.parseInt(parser.getAttributeValue(null, "order")));
}
}
break;
case XmlPullParser.END_TAG:
if (tagname.equalsIgnoreCase("segment")) {
// add segment object to list
segments.add(segment);
} else if (("configuration").equalsIgnoreCase(tagname) && parser.getAttributeValue(null, "name").equalsIgnoreCase(configuration)) {
return segments;
}
break;
}
eventType = parser.next();
}
} catch (XmlPullParserException e) {e.printStackTrace();}
catch (IOException e) {e.printStackTrace();}
return segments;
}
where configuration is the name attribute of configuration tag. But getting an exception -
org.xmlpull.v1.XmlPullParserException: expected: START_TAG {null}configuration (position:START_DOCUMENT null#1:1 in java.io.InputStreamReader#42323800)
Please help me where I am going wrong.
Make these two changes in your code:
Make xml valid. The segment tags are not ended. They should be:<segment order="1" name="left upper anterior"/>
Remove the line parser.require(XmlPullParser.START_TAG, null, "configuration");
Everything else looks fine. I was able to run your code as well.
I have been creating an app recently that I am working on. The app simply shows the contents of a RSS feed in a ListView where the list items is clickable. It worked on Android 3.0 and below, but once i upgraded my app and device to 4.0 and above, it failed. I can see that I need to use a custom thread because of the NetworkOnMainThreadException, so I have chosen AsyncTask. I simply have a listview in my XML with id android:id/list and the code I use to load the feed looks like this:
//Load RSS news feed
// Initializing instance variables
headlines = new ArrayList();
links = new ArrayList();
try {
URL url = new URL("http://www.vg.no/rss/create.php?categories=25,10,49,26,23,20,21,12,32,30,34&keywords=85,98,1724,84,476,821,820,512,8317,343&limit=15");
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(false);
XmlPullParser xpp = factory.newPullParser();
// We will get the XML from an input stream
xpp.setInput(getInputStream(url), "UTF_8");
/* We will parse the XML content looking for the "<title>" tag which appears inside the "<item>" tag.
* However, we should take in consideration that the rss feed name also is enclosed in a "<title>" tag.
* As we know, every feed begins with these lines: "<channel><title>Feed_Name</title>...."
* so we should skip the "<title>" tag which is a child of "<channel>" tag,
* and take in consideration only "<title>" tag which is a child of "<item>"
*
* In order to achieve this, we will make use of a boolean variable.
*/
boolean insideItem = false;
// Returns the type of current event: START_TAG, END_TAG, etc..
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
if (xpp.getName().equalsIgnoreCase("item")) {
insideItem = true;
} else if (xpp.getName().equalsIgnoreCase("title")) {
if (insideItem)
headlines.add(xpp.nextText()); //extract the headline
} else if (xpp.getName().equalsIgnoreCase("link")) {
if (insideItem)
links.add(xpp.nextText()); //extract the link of article
}
}else if(eventType==XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item")){
insideItem=false;
}
eventType = xpp.next(); //move to next element
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Binding data
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_list_item_1, headlines);
setListAdapter(adapter);
} catch (RuntimeException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Toast.makeText(getApplicationContext(), "Cannot load news, please check internett connection", Toast.LENGTH_LONG).show();
}
I have been trying to understand it; however, I cannot get it to work. If someone could please help me put all of this in AsyncTask and call the RSS refresh on onCreate() and on onClick() and explain how, it would be great.
Thanks!
this is a boilerplate inline AsyncTask method
new AsyncTask<Void, Void, Void>({
//initialize headlines here or outside of here or before this Asynctask
headlines = new ArrayList();
links = new ArrayList();
#Override
protected Void doInBackground(Void... params)
try {
URL url = new URL("http://www.vg.no/rss/create.php?categories=25,10,49,26,23,20,21,12,32,30,34&keywords=85,98,1724,84,476,821,820,512,8317,343&limit=15");
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
factory.setNamespaceAware(false);
XmlPullParser xpp = factory.newPullParser();
// We will get the XML from an input stream
xpp.setInput(getInputStream(url), "UTF_8");
/* We will parse the XML content looking for the "<title>" tag which appears inside the "<item>" tag.
* However, we should take in consideration that the rss feed name also is enclosed in a "<title>" tag.
* As we know, every feed begins with these lines: "<channel><title>Feed_Name</title>...."
* so we should skip the "<title>" tag which is a child of "<channel>" tag,
* and take in consideration only "<title>" tag which is a child of "<item>"
*
* In order to achieve this, we will make use of a boolean variable.
*/
boolean insideItem = false;
// Returns the type of current event: START_TAG, END_TAG, etc..
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_TAG) {
if (xpp.getName().equalsIgnoreCase("item")) {
insideItem = true;
} else if (xpp.getName().equalsIgnoreCase("title")) {
if (insideItem)
headlines.add(xpp.nextText()); //extract the headline
} else if (xpp.getName().equalsIgnoreCase("link")) {
if (insideItem)
links.add(xpp.nextText()); //extract the link of article
}
}else if(eventType==XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item")){
insideItem=false;
}
eventType = xpp.next(); //move to next element
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (XmlPullParserException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected Void onPostExecute() //UI THREAD STUFF , onPostExecute may need an argument, not sure yet though
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_list_item_1, headlines);
setListAdapter(adapter);
}
}).execute();
good luck, you can put a loading progress bar in onPreExecute()
I am using stax for the first time to parse an XML String. I have found some examples but can't get my code to work. This is the latest version of my code:
public class AddressResponseParser
{
private static final String STATUS = "status";
private static final String ADDRESS_ID = "address_id";
private static final String CIVIC_ADDRESS = "civic_address";
String status = null;
String addressId = null;
String civicAddress = null;
public static AddressResponse parseAddressResponse(String response)
{
try
{
byte[] byteArray = response.getBytes("UTF-8");
ByteArrayInputStream inputStream = new ByteArrayInputStream(byteArray);
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
XMLStreamReader reader = inputFactory.createXMLStreamReader(inputStream);
while (reader.hasNext())
{
int event = reader.next();
if (event == XMLStreamConstants.START_ELEMENT)
{
String element = reader.getLocalName();
if (element.equals(STATUS))
{
status = reader.getElementText();
continue;
}
if (element.equals(ADDRESS_ID))
{
addressId = reader.getText();
continue;
}
if (element.equals(CIVIC_ADDRESS))
{
civicAddress = reader.getText();
continue;
}
}
}
}
catch (Exception e)
{
log.error("Couldn't parse AddressResponse", e);
}
}
}
I've put watches on "event" and "reader.getElementText()". When the code is stopped on
String element = reader.getLocalName();
the "reader.getElementText()" value is displayed, but as soon as it moves away from that line it can't be evaluated. When the code is stopped on:
status = reader.getElementText();
the "element" watch displays the correct value. Finally, when I step the code one more line, I catch this exception:
(com.ctc.wstx.exc.WstxParsingException) com.ctc.wstx.exc.WstxParsingException: Current state not START_ELEMENT
at [row,col {unknown-source}]: [1,29]
I've tried using status = reader.getText(); instead, but then I get this exception:
(java.lang.IllegalStateException) java.lang.IllegalStateException: Not a textual event (END_ELEMENT)
Can somebody point out what I'm doing wrong??
EDIT:
Adding JUnit code used to test:
public class AddressResponseParserTest
{
private String status = "OK";
private String address_id = "123456";
private String civic_address = "727";
#Test
public void testAddressResponseParser() throws UnsupportedEncodingException, XMLStreamException
{
AddressResponse parsedResponse = AddressResponseParser.parseAddressResponse(this.responseXML());
assertEquals(this.status, parsedResponse.getStatus());
assertEquals(this.address_id, parsedResponse.getAddress()
.getAddressId());
assertEquals(this.civic_address, parsedResponse.getAddress()
.getCivicAddress());
}
private String responseXML()
{
StringBuffer buffer = new StringBuffer();
buffer.append("<response>");
buffer.append("<status>OK</status>");
buffer.append("<address>");
buffer.append("<address_id>123456</address_id>");
buffer.append("<civic_address>727</civic_address>");
buffer.append("</address>");
buffer.append("</response>");
return buffer.toString();
}
}
I found a solution that uses XMLEventReader instead of XMLStreamReader:
public MyObject parseXML(String xml)
throws XMLStreamException, UnsupportedEncodingException
{
byte[] byteArray = xml.getBytes("UTF-8");
ByteArrayInputStream inputStream = new ByteArrayInputStream(byteArray);
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
XMLEventReader reader = inputFactory.createXMLEventReader(inputStream);
MyObject object = new MyObject();
while (reader.hasNext())
{
XMLEvent event = (XMLEvent) reader.next();
if (event.isStartElement())
{
StartElement element = event.asStartElement();
if (element.getName().getLocalPart().equals("ElementOne"))
{
event = (XMLEvent) reader.next();
if (event.isCharacters())
{
String elementOne = event.asCharacters().getData();
object.setElementOne(elementOne);
}
continue;
}
if (element.getName().getLocalPart().equals("ElementTwo"))
{
event = (XMLEvent) reader.next();
if (event.isCharacters())
{
String elementTwo = event.asCharacters().getData();
object.setElementTwo(elementTwo);
}
continue;
}
}
}
return object;
}
I would still be interested in seeing a solution using XMLStreamReader.
Make sure you read javadocs for Stax: since it is fully streaming parsing mode, only information contained by the current event is available. There are some exceptions, however; getElementText() for example must start at START_ELEMENT, but will then try to combine all textual tokens from inside current element; and when returning, it will point to matching END_ELEMENT.
Conversely, getText() on START_ELEMENT will not returning anything useful (since START_ELEMENT refers to tag, not child text tokens/nodes 'inside' start/end element pair). If you want to use it instead, you have to explicitly move cursor in stream by calling streamReader.next(); whereas getElementText() does it for you.
So what is causing the error? After you have consumed all start/end-element pairs, next token will be END_ELEMENT (matching whatever was the parent tag). So you must check for the case where you get END_ELEMENT, instead of yet another START_ELEMENT.
I faced a similar issue as I was getting "IllegalStateException: Not a textual event" message
When I looked through your code I figured out that if you had a condition:
if (event == XMLStreamConstants.START_ELEMENT){
....
addressId = reader.getText(); // it throws exception here
....
}
(Please note: StaXMan did point out this in his answer!)
This happens since to fetch text, XMLStreamReader instance must have encountered 'XMLStreamConstants.CHARACTERS' event!
There maybe a better way to do this...but this is a quick and dirty fix (I have only shown lines of code that may be of interest)
Now to make this happen modify your code slightly:
// this will tell the XMLStreamReader that it is appropriate to read the text
boolean pickupText = false
while(reader.hasNext()){
if (event == XMLStreamConstants.START_ELEMENT){
if( (reader.getLocalName().equals(STATUS) )
|| ( (reader.getLocalName().equals(STATUS) )
|| ((reader.getLocalName().equals(STATUS) ))
// indicate the reader that it has to pick text soon!
pickupText = true;
}
}else if (event == XMLStreamConstants.CHARACTERS){
String textFromXML = reader.getText();
// process textFromXML ...
//...
//set pickUpText false
pickupText = false;
}
}
Hope that helps!
Here is an example with XMLStreamReader:
XMLInputFactory inputFactory = XMLInputFactory.newInstance();
Map<String, String> elements = new HashMap<>();
try {
XMLStreamReader xmlReader = inputFactory.createXMLStreamReader(file);
String elementValue = "";
while (xmlReader.hasNext()) {
int xmlEventType = xmlReader.next();
switch (xmlEventType) {
// Check for Start Elements
case XMLStreamConstants.START_ELEMENT:
//Get current Element Name
String elementName = xmlReader.getLocalName();
if(elementName.equals("td")) {
//Get Elements Value
elementValue = xmlReader.getElementText();
}
//Add the new Start Element to the Map
elements.put(elementName, elementValue);
break;
default:
break;
}
}
//Close Session
xmlReader.close();
} catch (Exception e) {
log.error(e.getMessage(), e);
}