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我正在测试使用此代码获取我的 xml 值

   static final String URL = "http://api.androidhive.info/pizza/?format=xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_NAME = "name";
static final String KEY_COST = "cost";
static final String KEY_DESC = "description";

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

NodeList nl = doc.getElementsByTagName(KEY_ITEM);

// looping through all item nodes <item>     
for (int i = 0; i < nl.getLength(); i++) {
    String name = parser.getValue(e, KEY_NAME); // name child value
    String cost = parser.getValue(e, KEY_COST); // cost child value
    String description = parser.getValue(e, KEY_DESC); // description child value
}

xml 的子元素是相同的，唯一的区别是我在 asp.net 10.0.2.2:57843/menus/json/getall上获取 xml结构 xml

 **<ArrayOfitem>**
       <item>
           <cost>445</cost>
           <description>sarap</description>
           <id>1</id>
           <name>pizza</name>
       </item>

与 http://api.androidhive.info/pizza/?format=xml相比

**<menu>**
       <item>
          <id>1</id>
          <name>Margherita</name>
          <cost>155</cost>
          <description>Single cheese topping</description>
        </item>

我有一个 logcat 错误

07-08 04:10:10.329: E/Error:(1968): Unexpected token (position:TEXT {"ExceptionType"...@1:922 in java.io.StringReader@b5182a40) 
07-08 04:10:10.329: E/AndroidRuntime(1968): FATAL EXCEPTION: main
07-08 04:10:10.329: E/AndroidRuntime(1968): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidhive.xmlparsing/com.androidhive.xmlparsing.AndroidXMLParsingActivity}: java.lang.NullPointerException
07-08 04:10:10.329: E/AndroidRuntime(1968):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)


ComponentInfo{com.androidhive.xmlparsing/com.androidhive.xmlparsing.AndroidXMLPa‌​rsingActivity}: java.lang.NullPointerException Caused by: java.lang.NullPointerException at com.androidhive.xmlparsing.AndroidXMLParsingActivity.onCreate(AndroidXMLParsingA‌​ctivity.java:43

line 43 NodeList nl = doc.getElementsByTagName(KEY_ITEM); and we got the same parent node of <item>

有人有时间解释或纠正我的问题吗？，谢谢。

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