The following classes could not be instantiated: - android.support.v7.widget.Toolbar 解决办法

看了一篇博客然后把它的源码复制到androidstudio中琢磨一下但是总是报The following classes could not be instantiated: - android.support.v7.widget.Toolbar，郁闷了好久。

然后发现将res/values/styles.xml 文件下的