GridLayout兼容——ClassNotFoundException:没有找到class“android.support.v7.widget.GridLayout”

I'm trying to use GridLayout in my Android 2.2 project, and after having installed the gridlayout_v7 project in my workspace, adding it to my projects Android Dependencies, adding a custom xmlns for its custom attributes, and embedding it in my xml layout as such:I'm trying to use GridLayout in my Android 2.2