如何解决尝试打开Android XML文件时Eclipse中出现的nullpointerexception？

由于我在Eclipse中将ADT插件更新到了v1.21，因此我无法再轻松地在我的Android项目中打开任何XML布局文件。只要我点击该文件，就会抛出NullPointerException。下面是错误日志中的堆栈跟踪：如何解决尝试打开Android XML文件时Eclipse中出现的nullpointerexception？

java.lang.NullPointerException 
    at com.android.ide.eclipse.adt.internal.editors.common.CommonMatchingStrategy.matches(CommonMatchingStrategy.java:59) 
    at org.eclipse.ui.internal.WorkbenchPage.checkEditor(WorkbenchPage.java:2254) 
    at org.eclipse.ui.internal.WorkbenchPage.findEditors(WorkbenchPage.java:2223) 
    at org.eclipse.ui.internal.WorkbenchPage.findEditor(WorkbenchPage.java:2205) 
    at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.isOpenInEditor(EditorUtility.java:131) 
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.linkToEditor(PackageExplorerPart.java:929) 
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.access$2(PackageExplorerPart.java:926) 
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.linkToEditor(PackageExplorerPart.java:533) 
    at org.eclipse.ui.OpenAndLinkWithEditorHelper$InternalListener.selectionChanged(OpenAndLinkWithEditorHelper.java:57) 
    at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:888) 
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) 
    at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:49) 
    at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:175) 
    at org.eclipse.jface.viewers.StructuredViewer.firePostSelectionChanged(StructuredViewer.java:886) 
    at org.eclipse.jface.viewers.StructuredViewer.handlePostSelect(StructuredViewer.java:1226) 
    at org.eclipse.jface.viewers.StructuredViewer$5.widgetSelected(StructuredViewer.java:1251) 
    at org.eclipse.jface.util.OpenStrategy.firePostSelectionEvent(OpenStrategy.java:262) 
    at org.eclipse.jface.util.OpenStrategy.access$5(OpenStrategy.java:256) 
    at org.eclipse.jface.util.OpenStrategy$3.run(OpenStrategy.java:433) 
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) 
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135) 
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4144) 
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3761) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1029) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:923) 
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86) 
    at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588) 
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) 
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543) 
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) 
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124) 
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) 
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) 
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) 
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353) 
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629) 
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584) 
    at org.eclipse.equinox.launcher.Main.run(Main.java:1438) 
    at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

我可以打开该文件，如果我上右键单击它，并告诉它t用传统的Android布局编辑器中打开，但它显然不是好办法。我试着进入Eclipse首选项，并确保XML文件的文件关联设置正确。

来源

2012-11-15 user496854

看起来像一个完全的Eclipse错误。我想你必须记录下来。也许这很常见，并且正在讨论他们的论坛？ – Simon

以前的版本中有几个线程做类似的工作，但没有一个解决方案似乎适用 – user496854

看起来像Android Developer Tools中的错误。 – nitind

我通过关闭编辑器中所有打开的项目文件并重新启动Eclipse来解决此问题。

来源

2014-02-14 07:44:25

为我工作。关闭项目，关闭所有打开的文件，重新启动Eclipse，打开项目 – Andrei

没有为我工作。当关闭所有项目并重新启动时 - 第一个项目会自动重新打开......尝试几次 - 关闭并重新启动，然后重新生成。 –

我切换到新的工作区，然后一切正常。

来源

2014-07-03 08:30:17 kongyang

如何解决尝试打开Android XML文件时Eclipse中出现的nullpointerexception？

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