CODEWITHSUNDEEP
javaandroidxmlxpath
Muhammad Ali
Muhammad Ali

Reputation: 3536

Search and display value from XML - Android Java

I'm working on a weather app that shows the min and maximum temperature of a city using the code below.

The XML includes data for multiple days. To make it short I only included temp for 2 days. The code below pulls temperatures for the first date only, hence item(0). How do I make it pull the data out for the current date or any date? I've figured how to get current date but I'm not sure how to query the XML using that date.

//========================= Getting min/max Temperature ==================//
Node nNodem = docm.getElementsByTagName("temperature").item(0);
Element eElementm = (Element) nNodem;
String xmaxtemp = eElementm.getAttribute("max");
String xmintemp = eElementm.getAttribute("min");
//========================= Getting Current Date ========================//
DateFormat dft = new SimpleDateFormat("yyyy-MM-dd");
String t = dft.format(Calendar.getInstance().getTime());

<weatherdata>
  <location>
    <name>London</name>
    <type/>
    <country>GB</country>
    <timezone/>
    <location altitude="0" latitude="51.50853" longitude="-0.12574" geobase="geonames" geobaseid="2643743" />
  </location>
  <credit/>
  <meta>
  <lastupdate/>
  <calctime>0.0249</calctime>
  <nextupdate/>
  </meta>
  <sun rise="2015-10-24T06:40:49" set="2015-10-24T16:47:34" />
  <forecast>
    <time day="2015-10-24">
      <symbol number="500" name="light rain" var="10n" />
      <precipitation/>
      <windDirection deg="310" code="NW" name="Northwest" />
      <windSpeed mps="4.72" name="Gentle Breeze" />
      <temperature day="7.2" min="5.78" max="7.2" night="5.78" eve="7.2" morn="7.2" />
      <pressure unit="hPa" value="1025.83" />
      <humidity value="93" unit="%" />
      <clouds value="clear sky" all="0" unit="%" />
    </time>
    <time day="2015-10-25">
      <symbol number="802" name="scattered clouds" var="03d" />
      <precipitation/>
      <windDirection deg="216" code="SW" name="Southwest" />
      <windSpeed mps="2.86" name="Light breeze" />
      <temperature day="10.83" min="3.35" max="11.15" night="4.67" eve="7.03" morn="3.35" />
      <pressure unit="hPa" value="1033.05" />
      <humidity value="100" unit="%" />
      <clouds value="scattered clouds" all="32" unit="%" />
    </time>
  </forecast>
</weatherdata>
Edited: I tried this but it's not working:

XPath xPath = XPathFactory.newInstance().newXPath();
String expression = "//time[@day='2015-10-26']";
try {
  NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(doc, XPathConstants.NODESET);
  for (int i = 0; i < nodeList.getLength(); i++) {

    Node nNode = nodeList.item(i);
    if (nNode.getNodeType() == Node.ELEMENT_NODE) {
      Element eElement = (Element) nNode;
      System.out.println("Date: " + eElement.getAttribute("day"));
      System.out.println("Max Temperature: " + eElement.getAttribute("max"));
    }
  }
} catch (XPathExpressionException e) {
  System.out.println(e);
}

Shows this:

Date: 2015-10-26
Max Temperature:

Upvotes: 1

Views: 198

Answers (3)

Muhammad Ali
Muhammad Ali

Reputation: 3536

I got it working using examples online. Here is the solution :)

XPath xPath = XPathFactory.newInstance().newXPath();
String timeStamp = new SimpleDateFormat("yyyy-MM-dd").format(Calendar.getInstance().getTime());
String expression = "//time[@day='" + timeStamp + "']/temperature";
try {
  NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(docm, XPathConstants.NODESET);
  Node nNodem = nodeList.item(0);
  if (nNodem.getNodeType() == Node.ELEMENT_NODE) {
    Element eElementm = (Element) nNodem;
    double dmax = Math.round(Double.parseDouble(eElementm.getAttribute("max")));
    int dxmax = (int) dmax;
    xmaxtemp = Integer.toString(dxmax);
    double dmin = Math.round(Double.parseDouble(eElementm.getAttribute("min")));
    int dxmin = (int) dmin;
    xmintemp = Integer.toString(dxmin);
  }
} catch (Exception e) {
  System.out.println(e);
}

Upvotes: 0

Will Evers
Will Evers

Reputation: 942

use and XMLPullParser to parse the xml and then iterate through the nodes to find what youre looking for

Upvotes: 1

bond007
bond007

Reputation: 2494

Create a list of Objects after parsing the XML from the NodeList

and then you can easily find any record as per the date.

Upvotes: 0

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