Question

每当我尝试添加新的Activity或Fragment时，我都会收到此错误。（SDK-25.2.5）

 null
    java.lang.NullPointerException
        at com.android.tools.idea.actions.NewAndroidComponentAction.actionPerformed(NewAndroidComponentAction.java:121)
        at com.intellij.openapi.actionSystem.ex.ActionUtil$1.run(ActionUtil.java:197)
        at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
        at com.intellij.openapi.application.TransactionGuardImpl.submitTransactionAndWait(TransactionGuardImpl.java:156)
        at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:211)
        at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.lambda$actionPerformed$2(ActionMenuItem.java:304)
        at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:905)
        at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124)
        at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:284)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
        at com.intellij.openapi.actionSystem.impl.ActionMenuItem.lambda$fireActionPerformed$0(ActionMenuItem.java:112)
        at com.intellij.openapi.application.TransactionGuardImpl.runSyncTransaction(TransactionGuardImpl.java:88)
        at com.intellij.openapi.application.TransactionGuardImpl.access$300(TransactionGuardImpl.java:40)
        at com.intellij.openapi.application.TransactionGuardImpl$2.run(TransactionGuardImpl.java:113)
        at com.intellij.openapi.application.TransactionGuardImpl.submitTransaction(TransactionGuardImpl.java:123)
        at com.intellij.openapi.application.TransactionGuard.submitTransaction(TransactionGuard.java:109)
        at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:112)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
        at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308)
        at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
        at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
        at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
        at java.awt.Component.processMouseEvent(Component.java:6533)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
        at java.awt.Component.processEvent(Component.java:6298)
        at java.awt.Container.processEvent(Container.java:2236)
        at java.awt.Component.dispatchEventImpl(Component.java:4889)
        at java.awt.Container.dispatchEventImpl(Container.java:2294)
        at java.awt.Component.dispatchEvent(Component.java:4711)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
        at java.awt.Container.dispatchEventImpl(Container.java:2280)
        at java.awt.Window.dispatchEventImpl(Window.java:2746)
        at java.awt.Component.dispatchEvent(Component.java:4711)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
        at java.awt.EventQueue.access$500(EventQueue.java:97)
        at java.awt.EventQueue$3.run(EventQueue.java:709)
        at java.awt.EventQueue$3.run(EventQueue.java:703)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
        at java.awt.EventQueue$4.run(EventQueue.java:731)
        at java.awt.EventQueue$4.run(EventQueue.java:729)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
        at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:795)
        at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:627)
        at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:387)
        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)

因为这不起作用，现在我正在添加java类，xml文件，然后将它们链接在一起。这是一个解决方案???

编辑 - 目前我的项目没有任何代码（除了默认生成的activity_main.xml和MainActivity.java），因此必须存在IDE错误。这是因为当我尝试将新Activity添加到我的项目时（通过右键单击项目＆gt; new＆gt; Activity＆gt; EmptyActivity），并且在我打开的每个项目中都显示此错误（在右下角的IDE错误日志中）。我试过invalidate并重新启动它没有工作任何解决方案??

Answer 1

试 - 转到＆＃34;文件＆＃34;关于android studio的导航。 - 然后选择选项＆＃34;使高速缓存无效/重新启动..＆＃34;

Android Studio 2.3空指针异常

1 个答案: