I am trying to parse an XML file. This is the file:
<root>
<entry>
<username>achanda</username>
<latitude>45.123</latitude>
<longtitude>76.345</longtitude>
<timestamp>2000</timestamp>
<filename>image2.jpg</filename>
</entry>
<entry>
<username>achanda</username>
<latitude>45.123</latitude>
<longtitude>76.345</longtitude>
<timestamp>2000</timestamp>
<filename>image2.jpg</filename>
</entry>
<entry>
<username>achanda</username>
<latitude>45.123</latitude>
<longtitude>76.345</longtitude>
<timestamp>2000</timestamp>
<filename>image2.jpg</filename>
</entry>
</root>
This is the code:
private String getTextValue(Element ele, String tagName) {
String textVal = "";
NodeList nl = ele.getElementsByTagName(tagName);
if (nl != null && nl.getLength() > 0) {
Element el = (Element) nl.item(0);
Node n = el.getFirstChild();
//TODO this line throws an exception for the last
//entry in the xml file. Fix this
textVal = n.getNodeValue();
}
return textVal;
}
This parses the file for the first two <entry> tags but getNodeValue() returns null for the last tag. I found here that it’s supposed to return null in some conditions. How do I extract the fields then? I tried casting el.getFirstChild() to Element, even that did not work.
private float getFloatValue(Element ele, String tagName) {
return Float.parseFloat(getTextValue(ele, tagName));
}
public ArrayList<GeoPoint> parseFile(String path) {
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
Document dom = null;
ArrayList<GeoPoint> gp = new ArrayList<GeoPoint>();
try {
DocumentBuilder db = dbf.newDocumentBuilder();
dom = db.parse(path);
org.w3c.dom.Element eroot = dom.getDocumentElement();
NodeList nl = eroot.getElementsByTagName("entry");
if (nl != null && nl.getLength() > 0) {
for (int i = 0; i < nl.getLength(); i++) {
org.w3c.dom.Element el = (org.w3c.dom.Element) nl.item(i);
float lat = (float) (getFloatValue(el, LAT) * 1E6);
float lon = (float) (getFloatValue(el, LON) * 1E6);
Log.e("###LAT: ", Float.toString(lat));
Log.e("###LON: ", Float.toString(lon));
//gp.add(new GeoPoint((int) lat, (int) lon));
}
}
} catch (ParserConfigurationException pce) {
pce.printStackTrace();
} catch (SAXException se) {
se.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
return gp;
}
Logcat output:
12-08 01:05:38.718: D/AndroidRuntime(3148): Shutting down VM
12-08 01:05:38.718: W/dalvikvm(3148): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-08 01:05:38.779: E/AndroidRuntime(3148): FATAL EXCEPTION: main
12-08 01:05:38.779: E/AndroidRuntime(3148): java.lang.IllegalStateException: Could not execute method of the activity
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.view.View$1.onClick(View.java:2144)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.view.View.performClick(View.java:2485)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.view.View$PerformClick.run(View.java:9080)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.os.Handler.handleCallback(Handler.java:587)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.os.Handler.dispatchMessage(Handler.java:92)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.os.Looper.loop(Looper.java:130)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.app.ActivityThread.main(ActivityThread.java:3683)
12-08 01:05:38.779: E/AndroidRuntime(3148): at java.lang.reflect.Method.invokeNative(Native Method)
12-08 01:05:38.779: E/AndroidRuntime(3148): at java.lang.reflect.Method.invoke(Method.java:507)
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-08 01:05:38.779: E/AndroidRuntime(3148): at dalvik.system.NativeStart.main(Native Method)
12-08 01:05:38.779: E/AndroidRuntime(3148): Caused by: java.lang.reflect.InvocationTargetException
12-08 01:05:38.779: E/AndroidRuntime(3148): at java.lang.reflect.Method.invokeNative(Native Method)
12-08 01:05:38.779: E/AndroidRuntime(3148): at java.lang.reflect.Method.invoke(Method.java:507)
12-08 01:05:38.779: E/AndroidRuntime(3148): at android.view.View$1.onClick(View.java:2139)
12-08 01:05:38.779: E/AndroidRuntime(3148): ... 11 more
12-08 01:05:38.779: E/AndroidRuntime(3148): Caused by: java.lang.NullPointerException
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.apps.terrapin.SearchActivity.getTextValue(SearchActivity.java:186)
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.apps.terrapin.SearchActivity.getFloatValue(SearchActivity.java:192)
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.apps.terrapin.SearchActivity.parseFile(SearchActivity.java:209)
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.apps.terrapin.SearchActivity.searchData(SearchActivity.java:100)
12-08 01:05:38.779: E/AndroidRuntime(3148): at com.apps.terrapin.SearchActivity.searchClicked(SearchActivity.java:70)
12-08 01:05:38.779: E/AndroidRuntime(3148): ... 14 more
Update
This issue was resolved once I deleted all contents of the xml file and wrote it again. It seems that Android was caching the file somehow. What else could have been a problem here?
This issue was resolved once I deleted all contents of the xml file and wrote it again. It seems that Android was caching the file somehow.