The following classes could not

android.support.v7.widget.Toolbar

项目中遇到此问题，在stack overflow上面找到了解决方法

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

照着操作居然成功了！记录下，防止类似问题