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这是我第一次使用 Android Studio，但我之前使用过 Eclipse 和 Xamarin for android。但是当我打开 main_activity.xml 时，没有“视觉”，也没有选择一个选项。我也得到了这样的致命错误：

这是错误：

null
java.lang.AssertionError
        at org.jetbrains.android.actions.AndroidRunSdkToolAction.actionPerformed(AndroidRunSdkToolAction.java:40)
        at com.intellij.ui.popup.PopupFactoryImpl$ActionPopupStep$1.run(PopupFactoryImpl.java:733)
        at com.intellij.ui.popup.AbstractPopup$18.run(AbstractPopup.java:1258)
        at com.intellij.openapi.wm.impl.FocusManagerImpl.flushRequest(FocusManagerImpl.java:641)
        at com.intellij.openapi.wm.impl.FocusManagerImpl.flushNow(FocusManagerImpl.java:622)
        at com.intellij.openapi.wm.impl.FocusManagerImpl.flushIdleRequests(FocusManagerImpl.java:592)
        at com.intellij.openapi.wm.impl.FocusManagerImpl.access$200(FocusManagerImpl.java:59)
        at com.intellij.openapi.wm.impl.FocusManagerImpl$IdleRunnable.runEdt(FocusManagerImpl.java:107)
        at com.intellij.openapi.util.EdtRunnable$1.run(EdtRunnable.java:28)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
        at java.awt.EventQueue.access$200(EventQueue.java:103)
        at java.awt.EventQueue$3.run(EventQueue.java:694)
        at java.awt.EventQueue$3.run(EventQueue.java:692)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
        at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:697)
        at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:524)
        at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:335)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

抱歉，很长，虽然我不知道它是什么意思。我尝试删除并重新安装sdk，但这没有用。

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