Question

我在SD卡上创建了一个空白的.xml文件，现在我正在尝试打开它进行解析。

DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
Document newDoc = docBuilder.parse(xmlFile);

当它到达parse（）方法时，我得到以下logcat：

03-11 12:07:20.676: E/Exception(18774): org.xml.sax.SAXParseException: Unexpected end of document
03-11 12:07:20.676: E/Exception(18774):     at org.apache.harmony.xml.parsers.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:131)
03-11 12:07:20.676: E/Exception(18774):     at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:186)
03-11 12:07:20.676: E/Exception(18774):     at mfc.generalguixapi8.SaveData4.saveData(SaveData4.java:76)
03-11 12:07:20.676: E/Exception(18774):     at mfc.generalguixapi8.SaveData4.onCreate(SaveData4.java:40)
03-11 12:07:20.676: E/Exception(18774):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
03-11 12:07:20.676: E/Exception(18774):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
03-11 12:07:20.676: E/Exception(18774):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
03-11 12:07:20.676: E/Exception(18774):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
03-11 12:07:20.676: E/Exception(18774):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
03-11 12:07:20.676: E/Exception(18774):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-11 12:07:20.676: E/Exception(18774):     at android.os.Looper.loop(Looper.java:123)
03-11 12:07:20.676: E/Exception(18774):     at android.app.ActivityThread.main(ActivityThread.java:4627)
03-11 12:07:20.676: E/Exception(18774):     at java.lang.reflect.Method.invokeNative(Native Method)
03-11 12:07:20.676: E/Exception(18774):     at java.lang.reflect.Method.invoke(Method.java:521)
03-11 12:07:20.676: E/Exception(18774):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
03-11 12:07:20.676: E/Exception(18774):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
03-11 12:07:20.676: E/Exception(18774):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

抛出异常，因为解析器不会将空白文件视为有效的XML文件。为了能够动态创建，更改和解析XML文件，您需要确保文件始终有效。要使它从一开始就有效，您应该考虑只放入一个根标记，然后在其中添加信息 - 这样您就不会在解析文件时遇到麻烦。

Answer 2

检查您的xml文件和根标记。

Answer 3

xml文件可能无效。请在启动解析方法调用之前验证xml。这是一个学习如何从SD卡读取xml文件的链接。希望link帮助你。

无法打开xml文件以便从SD卡解析

3 个答案: