Android Studio升级后，新建Activity始终报错，创建不了_android创建新的activity 旧activity 报错-优快云博客

本文链接：https://blog.youkuaiyun.com/u010705554/article/details/78355134

升级Android Studio到3.0后，新建Activity出现FreeMarker模板错误。问题出现在simple.xml.ftl文件中relativePackage变量未定义，通过简化布局文件解决了问题。

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今天升级Android Studio到3.0后，3.0的新特性还是让人挺喜欢的，但是当我新建一个Activity发现始终报错

Error executing FreeMarker template: The following has evaluated to null or missing:
==> relativePackage  [in template "root://activities/common/root/res/layout/simple.xml.ftl" at line 5, column 22]

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

The failing instruction:
==> ${relativePackage}  [in template "root://activities/common/root/res/layout/simple.xml.ftl" at line 5, column 20]
FreeMarker template error:
The following has evaluated to null or missing:
==> relativePackage  [in template "root://activities/common/root/res/layout/simple.xml.ftl" at line 5, column 22]

Tip: If the failing expression is known to be legally null/missing, either specify a default value with myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthessis: (myOptionVar.foo)!myDefault, (myOptionVar.foo)??

The failing instruction (FTL stack trace):
----------
==> ${relativePackage}  [in template "root://activities/common/root/res/layout/simple.xml.ftl" at line 5, column 20]
----------

Java stack trace (for programmers):
----------
freemarker.core.InvalidReferenceException: [... Exception message was already printed; see it above ...]
    at freemarker.core.InvalidReferenceException.getInstance(InvalidReferenceException.java:98)
    at freemarker.core.EvalUtil.coerceModelToString(EvalUtil.java:382)
    at freemarker.core.Expression.evalAndCoerceToString(Expression.java:115)
    at freemarker.core.DollarVariable.accept(DollarVariable.java:76)
    at freemarker.core.Environment.visit(Environment.java:265)
    at freemarker.core.MixedContent.accept(MixedContent.java:93)
    at freemarker.core.Environment.visit(Environment.java:265)
    at freemarker.core.Environment.process(Environment.java:243)
    at freemarker.template.Template.process(Template.java:277)
    at com.android.tools.idea.templates.FreemarkerUtils.processFreemarkerTemplate(FreemarkerUtils.java:96)
    at com.android.tools.idea.templates.recipe.DefaultRecipeExecutor.instantiate(DefaultRecipeExecutor.java:252)
    at com.android.tools.idea.templates.recipe.Recipe$InstantiateInstruction.execute(Recipe.java:172)
    at com.android.tools.idea.templates.recipe.Recipe.executeInstructions(Recipe.java:120)
    at com.android.tools.idea.templates.recipe.Recipe.execute(Recipe.java:110)
    at com.android.tools.idea.templates.recipe.Recipe.executeInstructions(Recipe.java:120)
    at com.android.tools.idea.templates.recipe.Recipe.execute(Recipe.java:105)
    at com.android.tools.idea.templates.Template$4.process(Template.java:568)
    at com.android.tools.idea.templates.FreemarkerUtils.processFreemarkerTemplate(FreemarkerUtils.java:102)
    at com.android.tools.idea.templates.Template.executeRecipeFile(Template.java:557)
    at com.android.tools.idea.templates.Template.access$200(Template.java:73)
    at com.android.tools.idea.templates.Template$3.startElement(Template.java:519)
    at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
    at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source)
    at com.android.tools.idea.templates.Template.processXml(Template.java:484)
    at com.android.tools.idea.templates.Template.processFile(Template.java:468)
    at com.android.tools.idea.templates.Template.lambda$doRender$2(Template.java:368)
    at com.android.tools.idea.templates.Template$1.run(Template.java:347)
    at com.intellij.openapi.application.RunResult.run(RunResult.java:35)
    at com.intellij.openapi.command.WriteCommandAction.lambda$null$1(WriteCommandAction.java:171)
    at com.intellij.openapi.application.impl.ApplicationImpl.runWriteAction(ApplicationImpl.java:1023)
    at com.intellij.openapi.command.WriteCommandAction.lambda$performWriteCommandAction$2(WriteCommandAction.java:170)
    at com.intellij.openapi.command.WriteCommandAction.lambda$doExecuteCommand$4(WriteCommandAction.java:210)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:149)
    at com.intellij.openapi.command.impl.CoreCommandProcessor.executeCommand(CoreCommandProcessor.java:119)
    at com.intellij.openapi.command.WriteCommandAction.doExecuteCommand(WriteCommandAction.java:212)
    at com.intellij.openapi.command.WriteCommandAction.performWriteCommandAction(WriteCommandAction.java:168)
    at com.intellij.openapi.command.WriteCommandAction.execute(WriteCommandAction.java:151)
    at com.android.tools.idea.templates.Template.runWriteCommandAction(Template.java:349)
    at com.android.tools.idea.templates.Template.doRender(Template.java:367)
    at com.android.tools.idea.templates.Template.render(Template.java:232)
    at com.android.tools.idea.npw.template.RenderTemplateModel$FreeMarkerTemplateRenderer.renderTemplate(RenderTemplateModel.java:267)
    at com.android.tools.idea.npw.template.RenderTemplateModel$FreeMarkerTemplateRenderer.doDryRun(RenderTemplateModel.java:196)
    at com.android.tools.idea.npw.template.MultiTemplateRenderer.countDown(MultiTemplateRenderer.java:58)
    at com.android.tools.idea.npw.template.MultiTemplateRenderer.requestRender(MultiTemplateRenderer.java:77)
    at com.android.tools.idea.npw.template.RenderTemplateModel.handleFinished(RenderTemplateModel.java:176)
    at com.android.tools.idea.wizard.model.ModelWizard.handleFinished(ModelWizard.java:393)
    at com.android.tools.idea.wizard.model.ModelWizard.goForward(ModelWizard.java:324)
    at com.android.tools.idea.wizard.model.ModelWizardDialog$FinishAction.doAction(ModelWizardDialog.java:307)
    at com.intellij.openapi.ui.DialogWrapper$DialogWrapperAction.actionPerformed(DialogWrapper.java:1838)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6541)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
    at java.awt.Component.processEvent(Component.java:6306)
    at java.awt.Container.processEvent(Container.java:2237)
    at java.awt.Component.dispatchEventImpl(Component.java:4897)
    at java.awt.Container.dispatchEventImpl(Container.java:2295)
    at java.awt.Component.dispatchEvent(Component.java:4719)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
    at java.awt.Container.dispatchEventImpl(Container.java:2281)
    at java.awt.Window.dispatchEventImpl(Window.java:2746)
    at java.awt.Component.dispatchEvent(Component.java:4719)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
    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.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
    at java.awt.EventQueue$4.run(EventQueue.java:737)
    at java.awt.EventQueue$4.run(EventQueue.java:735)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
    at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:827)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:651)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:109)
    at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:190)
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:235)
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:233)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:233)
    at java.awt.Dialog.show(Dialog.java:1084)
    at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl$MyDialog.show(DialogWrapperPeerImpl.java:736)
    at com.intellij.openapi.ui.impl.DialogWrapperPeerImpl.show(DialogWrapperPeerImpl.java:458)
    at com.intellij.openapi.ui.DialogWrapper.invokeShow(DialogWrapper.java:1696)
    at com.intellij.openapi.ui.DialogWrapper.show(DialogWrapper.java:1645)
    at com.android.tools.idea.actions.NewAndroidComponentAction.actionPerformed(NewAndroidComponentAction.java:140)
    at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:215)
    at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:232)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$0(ActionMenuItem.java:309)
    at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:929)
    at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:136)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:299)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:116)
    at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:86)
    at com.intellij.openapi.application.TransactionGuardImpl.lambda$submitTransaction$1(TransactionGuardImpl.java:109)
    at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:118)
    at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:122)
    at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:116)
    at com.intellij.ui.plaf.beg.BegMenuItemUI.doClick(BegMenuItemUI.java:513)
    at com.intellij.ui.plaf.beg.BegMenuItemUI.access$300(BegMenuItemUI.java:45)
    at com.intellij.ui.plaf.beg.BegMenuItemUI$MyMouseInputHandler.mouseReleased(BegMenuItemUI.java:533)
    at java.awt.Component.processMouseEvent(Component.java:6541)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
    at java.awt.Component.processEvent(Component.java:6306)
    at java.awt.Container.processEvent(Container.java:2237)
    at java.awt.Component.dispatchEventImpl(Component.java:4897)
    at java.awt.Container.dispatchEventImpl(Container.java:2295)
    at java.awt.Component.dispatchEvent(Component.java:4719)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4889)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4526)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4467)
    at java.awt.Container.dispatchEventImpl(Container.java:2281)
    at java.awt.Window.dispatchEventImpl(Window.java:2746)
    at java.awt.Component.dispatchEvent(Component.java:4719)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:764)
    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.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
    at java.awt.EventQueue$4.run(EventQueue.java:737)
    at java.awt.EventQueue$4.run(EventQueue.java:735)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:734)
    at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:827)
    at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:651)
    at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:365)
    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)

因为之前更新版本，为了不想使用ConstraintLayout，把 simple.xml.ftl这个文件备份了一份，然后照着网上的改成了RelativeLayout, 2.3版本还没有问题，升级到3.0就不行了？？？然后在网上也搜不到相关解决方法。最后仔细看看报错的位置，索性把那一行去掉吧，在创建布局的时候，这个去掉也不会有什么错。于是就改成了最简单的,这个反正也模板，如果需要属性什么也可以再添加，有个最基本的属性就够了

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</RelativeLayout>