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

初学安卓，找了半天，各种方法不行，这个解决了。

原网址（http://stackoverflow.com/questions/26575815/the-following-classes-could-not-be-instantiated-android-support-v7-widget-too）

I changed the res/values/styles.xml file from this: