Android Studio：The following classes could not be instantiated: - android.support.v7.widget.Toolbar

Android Studio：The following classes could not be instantiated: - android.support.v7.widget.Toolbar (Open Class, Show Exception, Clear Cache)

layout的preview界面无法预览，试过网上好多方法都不行，发现应该是API25兼容问题，只要改成API23即可，如图，试过其他版本API都不行

点击右上角即可改变API版本