我试图让XmlPullParser
工作,因为它比替代品更有意义。然而,由于XmlPullParserFactory.newInstance()
函数返回一个空工厂(由调试器看到),我正在陷入第一个障碍。因此,只要调用factory.newPullParser()
就会引发异常。Android:XmlPullParserFactory.newInstance()创建一个空工厂
import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;
public class XMLParser
{
public static void getXML(InputStream in)
throws XmlPullParserException, IOException {
try {
XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
XmlPullParser xpp = factory.newPullParser();
xpp.setInput(new StringReader("<foo>Hello World!</foo>"));
int eventType = xpp.getEventType();
while (eventType != XmlPullParser.END_DOCUMENT) {
if (eventType == XmlPullParser.START_DOCUMENT) {
System.out.println("Start document");
} else if (eventType == XmlPullParser.START_TAG) {
System.out.println("Start tag " + xpp.getName());
} else if (eventType == XmlPullParser.END_TAG) {
System.out.println("End tag " + xpp.getName());
} else if (eventType == XmlPullParser.TEXT) {
System.out.println("Text " + xpp.getText());
}
eventType = xpp.next();
}
System.out.println("End document");
} catch (Exception e) {
}
}
}
我从单元测试中调用此方法。我真的难以理解这个问题,因为我还没有发现任何有此类问题的帖子。
跟踪报告: 全部线程转储
"[email protected]" prio=5 tid=0x1 nid=NA runnable
java.lang.Thread.State: RUNNABLE
at com.company.app.XMLParser.getXmln(XMLParser.java:40)
at com.company.app.XMLParserTest.setUp(XMLParserTest.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-1)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:24)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
"[email protected]" daemon prio=8 tid=0x3 nid=NA waiting
java.lang.Thread.State: WAITING
at java.lang.Object.wait(Object.java:-1)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
"Reference [email protected]" daemon prio=10 tid=0x2 nid=NA waiting
java.lang.Thread.State: WAITING
at java.lang.Object.wait(Object.java:-1)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:157)
"Attach [email protected]" daemon prio=5 tid=0x5 nid=NA runnable
java.lang.Thread.State: RUNNABLE
"Signal [email protected]" daemon prio=9 tid=0x4 nid=NA runnable
java.lang.Thread.State: RUNNABLE
它只是返回一个新创建的实例;没有机会在那里变空。请将Log.wtf(“PullParser”,e)'添加到您的catch子句并发布结果。 – tynn
报告的异常是NullPointerException。 –
为我的问题添加了跟踪报告。希望它是你的后代。 –