[英]Parsing xml android gives a null pointer exception
我正在解析以下XML:
<?xml version="1.0"?>
<Root>
<ResponseCode>1</ResponseCode>
<ResponseMessage>Login Successfull</ResponseMessage>
<ResultSet>
<User>
<id>3</id>
<username>hassan</username>
<email>hassan</email>
<password>abcd</password>
<profileimagepath>c:/hahaha/hahaha</profileimagepath>
<createdOn>2013-03-23 12:45:51</createdOn>
<status>1</status>
</User>
</ResultSet>
</Root>
我用来解析XML的代码是:
InputSource is = new InputSource();
is.setCharacterStream(new StringReader(xmlResult));
XPathFactory factory = XPathFactory.newInstance();
XPath xPath = factory.newXPath();
try {
NodeList list = (NodeList) xPath.evaluate("/Root", is,XPathConstants.NODESET);
for(int i=0; i<list.getLength(); i++){
Node node = list.item(i);
Element element = (Element) node;
Log.d("VALUE OF NODE", element.getNodeValue());
}
} catch (XPathExpressionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
我无法判断为什么会发生这种异常。 解析它的正确方法是什么? 我正在Android 4.0上执行此操作。 这是logcat
03-24 01:50:54.412: I/Post service Response(1097): <?xml version="1.0"?><Root><ResponseCode>1</ResponseCode><ResponseMessage>Login Successfull</ResponseMessage><ResultSet><User><id>3</id><username>hassan</username><email>hassan</email><password>abcd</password><profileimagepath>c:/hahaha/hahaha</profileimagepath><createdOn>2013-03-23 12:45:51</createdOn><status>1</status></User></ResultSet></Root>
03-24 01:50:54.804: D/dalvikvm(1097): GC_CONCURRENT freed 1940K, 21% free 7888K/9927K, paused 11ms+15ms
03-24 01:50:55.284: W/dalvikvm(1097): threadid=11: thread exiting with uncaught exception (group=0x409961f8)
03-24 01:50:55.293: E/AndroidRuntime(1097): FATAL EXCEPTION: Thread-102
03-24 01:50:55.293: E/AndroidRuntime(1097): java.lang.NullPointerException: println needs a message
03-24 01:50:55.293: E/AndroidRuntime(1097): at android.util.Log.println_native(Native Method)
03-24 01:50:55.293: E/AndroidRuntime(1097): at android.util.Log.d(Log.java:138)
03-24 01:50:55.293: E/AndroidRuntime(1097): at com.teamgreen.greenit.LoginActivity$1$1.run(LoginActivity.java:87)
03-24 01:51:28.253: I/Process(1097): Sending signal. PID: 1097 SIG: 9
您从Log.d()
内部获取异常,因为element.getNodeValue()
返回null
。
您不能将null
作为第二个参数提供给Log.d()
。 考虑将相应的行更改为:
Log.d("xml", "VALUE OF NODE: " + element.getNodeValue());
与其专注于特定问题,不如尝试理解解释堆栈跟踪。 堆栈跟踪指向确切的问题:
E / AndroidRuntime(1097):位于android.util.Log.d(Log.java:138)
E / AndroidRuntime(1097):at com.teamgreen.greenit.LoginActivity $ 1 $ 1.run(LoginActivity.java:87)
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