java - importNode引发异常org.w3c.dom.DOMException

我正在编写必须将节点添加到XML文档中给定节点的函数。

这是该功能的实现：

/**
 * Adds the node aNewChild to the end of the list of children of this node.
 * If the newChild is already in the tree, it is first removed.
 * @param aNewChild The node to add.If it is a DocumentFragment object,
 *                  the entire contents of the document fragment are moved
 *                  into the child list of this node
 * @return The node added or null.
 */
 public Node AddNode(Node aNode, Node aOldNode) {
    Log.i(TAG, "AddNode()" );

    if (aNode == null) {
        Log.e(TAG, "aNode is null!");
        return null;
    }

    if (aOldNode == null) {
        Log.e(TAG, "aOldNode is null!");
        return null;
    }

    Document document = aNode.getOwnerDocument();

    aOldNode = document.importNode(aOldNode, true);

    return aNode.appendChild(aOldNode);

} /* Node AddNode(Node aNode, Node aOldNode) **/

这段代码可以在Android 4.0.3上很好地运行，没有问题，功能可以将节点添加到给定的节点而没有错误，但是当我在Android 2.3.3下运行相同的代码时，当我尝试添加try catch块时，功能在aOldNode = document.importNode(aOldNode, true);上崩溃像这样：

try {
    aOldNode = document.importNode(aOldNode, true);
}
catch(Exception ex) {
    Log.e(TAG, ex.getMessage());
}

我只看到null而不是错误消息。谁知道是什么原因？

这是例外：

06-05 17:58:09.111: I/TestRunner(2769): ----- begin exception -----
06-05 17:58:09.122: I/TestRunner(2769): org.w3c.dom.DOMException
06-05 17:58:09.122: I/TestRunner(2769):     at org.apache.harmony.xml.dom.NodeImpl.setNameNS(NodeImpl.java:227)
06-05 17:58:09.122: I/TestRunner(2769):     at org.apache.harmony.xml.dom.ElementImpl.<init>(ElementImpl.java:50)
06-05 17:58:09.122: I/TestRunner(2769):     at org.apache.harmony.xml.dom.DocumentImpl.createElementNS(DocumentImpl.java:336)
06-05 17:58:09.122: I/TestRunner(2769):     at org.apache.harmony.xml.dom.DocumentImpl.shallowCopy(DocumentImpl.java:156)
06-05 17:58:09.122: I/TestRunner(2769):     at org.apache.harmony.xml.dom.DocumentImpl.cloneOrImportNode(DocumentImpl.java:208)
06-05 17:58:09.122: I/TestRunner(2769):     at org.apache.harmony.xml.dom.DocumentImpl.importNode(DocumentImpl.java:222)
06-05 17:58:09.122: I/TestRunner(2769):     at com.fido.android.framework.service.XMLDOMNode.AddNode(XMLDOMNode.java:108)
06-05 17:58:09.122: I/TestRunner(2769):     at com.fido.android.test.framework.service.XMLDOMNodeTest.testAddNodeNodeNode(XMLDOMNodeTest.java:89)
06-05 17:58:09.122: I/TestRunner(2769):     at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:58:09.122: I/TestRunner(2769):     at java.lang.reflect.Method.invoke(Method.java:507)
06-05 17:58:09.122: I/TestRunner(2769):     at junit.framework.TestCase.runTest(TestCase.java:154)
06-05 17:58:09.122: I/TestRunner(2769):     at junit.framework.TestCase.runBare(TestCase.java:127)
06-05 17:58:09.122: I/TestRunner(2769):     at junit.framework.TestResult$1.protect(TestResult.java:106)
06-05 17:58:09.122: I/TestRunner(2769):     at junit.framework.TestResult.runProtected(TestResult.java:124)
06-05 17:58:09.122: I/TestRunner(2769):     at junit.framework.TestResult.run(TestResult.java:109)
06-05 17:58:09.122: I/TestRunner(2769):     at junit.framework.TestCase.run(TestCase.java:118)
06-05 17:58:09.122: I/TestRunner(2769):     at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
06-05 17:58:09.122: I/TestRunner(2769):     at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
06-05 17:58:09.122: I/TestRunner(2769):     at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:529)
06-05 17:58:09.122: I/TestRunner(2769):     at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1448)
06-05 17:58:09.132: I/TestRunner(2769): ----- end exception -----

据我了解importNode是一个越野车功能，我还能使用什么将节点添加到该节点？

最佳答案

我找到了解决方案并为我工作，这是修改后的函数，该函数将节点添加到节点而不会引发任何异常：

/**
  * Adds the node aNewChild to the end of the list of children of this node.
  * If the newChild is already in the tree, it is first removed.
  * @param aNewChild The node to add.If it is a DocumentFragment object,
  *                  the entire contents of the document fragment are moved
  *                  into the child list of this node
  * @return The node added or null.
  */
  public Node AddNode(Node aNode, Node aOldNode) {
        CustomLog.i(TAG, "AddNode()" );

        if (aNode == null) {
            CustomLog.e(TAG, "aNode is null!");
            return null;
        }

        if (aOldNode == null) {
            CustomLog.e(TAG, "aOldNode is null!");
            return null;
        }

        Document document = aNode.getOwnerDocument();

        aOldNode = document.adoptNode(aOldNode);

        return aNode.appendChild(aOldNode);

    } /* Node AddNode(Node aNode, Node aOldNode) **/

我只是使用aOldNode = document.adoptNode(aOldNode);而不是aOldNode = document.importNode(aOldNode, true);方法。