android 开发时用pull模式解析xml文件,XmlPullPraser.getName()获取的节点值为null

android 开发时用pull方式解析xml文件,XmlPullPraser.getName()获取的节点值为null
xml文件代码：

   
<apps>	
	<app>
		<id>1</id>
		<name>Google Maps</name>
		<version>1.0</version>
	</app>
	<app>
		<id>2</id>
		<name>Chrome</name>
		<version>2.1</version>
	</app>
	<app>
		<id>3</id>
		<name>Google Play</name>
		<version>2.3</version>
	</app>	
</apps>

有问题的在第十三行
java代码：

private void parseXMLWithPull(String XMLData){
        try{
            XmlPullParserFactory xmlPullParserFactory = XmlPullParserFactory.newInstance();
            XmlPullParser xmlPullParser = xmlPullParserFactory.newPullParser();
            xmlPullParser.setInput(new StringReader(XMLData));
            //0
            int eventType = xmlPullParser.getEventType();
            String id = "";
            String name = "";
            String version = "";
            //1
            while(eventType != XmlPullParser.END_DOCUMENT ){
                String nodeName = xmlPullParser.getName();
                switch (eventType){
                    //start to parse
                        //2
                    case XmlPullParser.START_TAG:{
                        if("id".equals(nodeName)){
                            id = xmlPullParser.nextText();
                        }else if ("name".equals(nodeName)){
                            name = xmlPullParser.nextText();
                        }else if("version".equals(nodeName)){
                            version = xmlPullParser.nextText();
                        }
                        break;
                    }
                    //end parse
                        //3
                    case XmlPullParser.END_TAG:{
                        if("app".equals(nodeName)){
                            Log.d("MainActivity", "id is " + id);
                            Log.d("MainActivity","name is " + name);
                            Log.d("MainActivity","version is " + version);
                        }
                        break;
                    }
                    default:
                        break;
                }
                eventType = xmlPullParser.next();
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("failed");
        }

    }

------解决思路----------------------
不知楼主解析XML是通过URL方式还是本地文件解析

如果是URL，请检查清单文件中是否添加了网络访问权限：

引用

  <uses-permission android:name="android.permission.INTERNET"/>

如果是本地，请Locat调试输出 ，检查是否解析的文件找不到错误。





本案例Pull解析楼主提供的xml文档demo下载地址：

http://pan.baidu.com/s/1o6GfGfS