创建的Android虚拟设备未显示

我在Android Studio中创建了一个AVD,但是当我去layout->时它没有显示activity_main.xml.错误消息显示如下.

Failed to create Context 0x3005
could not get wglGetExtensionsStringARB
emulator: WARNING: Could not initialize OpenglES emulation, using software renderer.
could not get wglGetExtensionsStringARB
could not get wglGetExtensionsStringARB
could not get wglGetExtensionsStringARB
could not get wglGetExtensionsStringARB
could not get wglGetExtensionsStringARB
could not get wglGetExtensionsStringARB
could not get wglGetExtensionsStringARB
emulator: emulator window was out of view and was recentered
Could not initialize emulated framebuffer

根据activity_main.xml有两个文件:activity_main.xml和activity_main.xml(土地).在右侧的"组件树"和"属性"空间下,显示"无需显示".

当我尝试渲染它时,它显示以下错误消息:

渲染问题渲染期间引发的异常:action_bar

xml文件如下所示:

有什么想法吗？

哦,我想出了问题.在将IDE中的布局从最佳选择版本转换为版本21时,我将Android版本更改为用户版本,该版本位于显示框上方的AppTheme和MainActivity旁边.