错误说明加载活动主抽屉的构建代码
问候，将我的Android Studio更新为版本3.1后，我对菜单部分(导航抽屉(有问题，预览不起作用，并且会引发错误" IDE错误"。当我单击位于IDE右下角的错误图标时，我会得到以下内容：
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)
我遇到了同样的问题。
我从文件activity_main_drawer.xml复制源代码并删除了。
所以，我创建了一个带有相同名称(activity_main_drawer.xml(的新"菜单资源文件"，然后将我复制的源代码放入其中。
它对我有用...