【发布时间】：2018-07-26 18:48:21
【问题描述】：
我在 Android Studio 中有一个奇怪的错误，它阻止我在菜单项中使用此属性来使用它的导航抽屉。 这是错误代码（NullPointerException）：
null
java.lang.NullPointerException
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.getRenderResult(LayoutlibSceneManager.java:602)
at com.android.tools.idea.uibuilder.surface.ScreenViewBase.getResult(ScreenViewBase.java:109)
at com.android.tools.idea.uibuilder.surface.ScreenView.getResult(ScreenView.java:30)
at com.android.tools.idea.uibuilder.menu.NavigationViewSceneView.getPreferredSize(NavigationViewSceneView.java:64)
at com.android.tools.idea.common.surface.SceneView.getPreferredSize(SceneView.java:95)
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.createSceneViewsForMenu(LayoutlibSceneManager.java:265)
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.doCreateSceneView(LayoutlibSceneManager.java:234)
at com.android.tools.idea.common.scene.SceneManager.createSceneView(SceneManager.java:73)
at com.android.tools.idea.common.scene.SceneManager.<init>(SceneManager.java:66)
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.<init>(LayoutlibSceneManager.java:157)
at com.android.tools.idea.uibuilder.surface.NlDesignSurface.createSceneManager(NlDesignSurface.java:145)
at com.android.tools.idea.common.surface.DesignSurface.setModel(DesignSurface.java:281)
at com.android.tools.idea.common.editor.NlEditorPanel.initNeleModelOnEventDispatchThread(NlEditorPanel.java:143)
at com.android.tools.idea.common.editor.NlEditorPanel.lambda$null$4(NlEditorPanel.java:139)
at com.intellij.openapi.project.DumbServiceImpl.lambda$smartInvokeLater$7(DumbServiceImpl.java:366)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:424)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:407)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:822)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
java.lang.NullPointerException
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.getRenderResult(LayoutlibSceneManager.java:602)
at com.android.tools.idea.uibuilder.surface.ScreenViewBase.getResult(ScreenViewBase.java:109)
at com.android.tools.idea.uibuilder.surface.ScreenView.getResult(ScreenView.java:30)
at com.android.tools.idea.uibuilder.menu.NavigationViewSceneView.getPreferredSize(NavigationViewSceneView.java:64)
at com.android.tools.idea.common.surface.SceneView.getPreferredSize(SceneView.java:95)
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.createSceneViewsForMenu(LayoutlibSceneManager.java:265)
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.doCreateSceneView(LayoutlibSceneManager.java:234)
at com.android.tools.idea.common.scene.SceneManager.createSceneView(SceneManager.java:73)
at com.android.tools.idea.common.scene.SceneManager.<init>(SceneManager.java:66)
at com.android.tools.idea.uibuilder.scene.LayoutlibSceneManager.<init>(LayoutlibSceneManager.java:157)
at com.android.tools.idea.uibuilder.surface.NlDesignSurface.createSceneManager(NlDesignSurface.java:145)
at com.android.tools.idea.common.surface.DesignSurface.setModel(DesignSurface.java:281)
at com.android.tools.idea.uibuilder.editor.NlPreviewForm.initNeleModel(NlPreviewForm.java:420)
at com.android.tools.idea.uibuilder.editor.NlPreviewForm.initPreviewFormAfterBuildOnEventDispatchThread(NlPreviewForm.java:353)
at com.intellij.util.ui.UIUtil.invokeLaterIfNeeded(UIUtil.java:2795)
at com.android.tools.idea.uibuilder.editor.NlPreviewForm.initPreviewFormAfterInitialBuild(NlPreviewForm.java:318)
at com.android.tools.idea.startup.ClearResourceCacheAfterFirstBuild.runWhenResourceCacheClean(ClearResourceCacheAfterFirstBuild.kt:80)
at com.android.tools.idea.uibuilder.editor.NlPreviewForm.initPreviewForm(NlPreviewForm.java:305)
at com.android.tools.idea.uibuilder.editor.NlPreviewForm.activate(NlPreviewForm.java:524)
at com.android.tools.idea.uibuilder.editor.NlPreviewManager$1.stateChanged(NlPreviewManager.java:141)
at sun.reflect.GeneratedMethodAccessor44.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.util.EventDispatcher.dispatch(EventDispatcher.java:99)
at com.intellij.util.EventDispatcher.access$200(EventDispatcher.java:35)
at com.intellij.util.EventDispatcher$2.invoke(EventDispatcher.java:79)
at com.sun.proxy.$Proxy81.stateChanged(Unknown Source)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.fireStateChanged(ToolWindowManagerImpl.java:1658)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.execute(ToolWindowManagerImpl.java:568)
at com.intellij.openapi.wm.impl.ToolWindowManagerImpl.activateToolWindow(ToolWindowManagerImpl.java:736)
at com.intellij.openapi.wm.impl.ToolWindowImpl.activate(ToolWindowImpl.java:203)
at com.android.tools.idea.uibuilder.editor.NlPreviewManager$2.run(NlPreviewManager.java:300)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:337)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:327)
at com.intellij.util.ui.update.MergingUpdateQueue.lambda$flush$1(MergingUpdateQueue.java:277)
at com.intellij.util.ui.UIUtil.invokeAndWaitIfNeeded(UIUtil.java:2816)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:288)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:246)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:246)
at com.intellij.util.Alarm$Request.runSafely(Alarm.java:417)
at com.intellij.util.Alarm$Request.access$700(Alarm.java:344)
at com.intellij.util.Alarm$Request$1.run(Alarm.java:384)
at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:315)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.runNextEvent(LaterInvocator.java:424)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:407)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:762)
at java.awt.EventQueue.access$500(EventQueue.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:715)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:732)
at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:822)
at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:650)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:366)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
如果您能帮助我用 Android Studio 修复此错误，会有所帮助吗？ 我已经搜索了很多解决方案，但没有找到任何东西。
【问题讨论】：
-
您应该可以删除：tools:showIn="navigation_view"，以防止该错误。
-
感谢您的帮助，但我仍然想知道它为什么会发生以及如何修复它以使用此属性
-
stackoverflow.com/questions/50201356/… 中有一个临时解决方法