RecyclerView上拉隐藏Toolbar,下拉显示 CoordinatorLayout官方提供方式

<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
>
<android.support.v7.widget.RecyclerView
android:id="@+id/search_result_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/main_color_background"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
/>
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/appBar"
>
<android.support.v7.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_collapseMode="pin"
app:layout_scrollFlags="scroll|enterAlways"
android:background="@android:color/white"
android:id="@+id/toolbar">
<include android:id="@+id/_top"
layout="@layout/activity_search_result_top"
/>
</android.support.v7.widget.Toolbar>
<include android:id="@+id/_tab"
layout="@layout/activity_search_result_tab"
/>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>