layout_behavior属性缺失

[fishsoft]

Error:(25) No resource identifier found for attribute 'layout_behavior' in package 'com.liaoinstan.demospring'

<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" app:layout_behavior="@string/appbar_scrolling_view_behavior">

[liaoinstan]

(⊙_⊙;) ...什么