如何在AppBarLayout下滚动NestedScrollView

Question

我正在尝试使用浮动搜索视图来实现此行为，其中NestedScrollView在应用栏布局下滚动。

我目前所拥有的是滚动视图位于appbarlayout下方的位置：

一些代码：

    <android.support.design.widget.AppBarLayout android:layout_width="match_parent"
                                                android:layout_height="@dimen/appbar_home"
                                                android:background="@null"
                                                app:elevation="0dp">


            <com.arlib.floatingsearchview.FloatingSearchView android:id="@+id/floating_search_view"
                                                             style="@style/SearchView"
                                                             android:layout_width="match_parent"
                                                             android:layout_height="match_parent"
                                                             app:layout_scrollFlags="scroll|enterAlways|snap"
                                                             app:floatingSearch_searchBarMarginLeft="@dimen/content_spacing"
                                                             app:floatingSearch_searchBarMarginRight="@dimen/content_spacing"
                                                             app:floatingSearch_searchBarMarginTop="32dp"
                                                             app:floatingSearch_close_search_on_keyboard_dismiss="true"
                                                             app:floatingSearch_leftActionMode="showSearch"
                                                             app:floatingSearch_menu="@menu/menu_home"
                                                             app:floatingSearch_searchHint="Search..."
                                                             app:floatingSearch_showSearchKey="false"
                                                             app:floatingSearch_suggestionsListAnimDuration="250"/>

    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView android:layout_width="match_parent"
                                                android:layout_height="match_parent"
                                                app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <FrameLayout android:id="@+id/scroll"
                     android:layout_width="match_parent"
                     android:layout_height="match_parent">

            <ImageView android:layout_width="match_parent"
                       android:layout_height="wrap_content"
                       android:scaleType="fitXY"
                       android:src="@drawable/test"/>


        </FrameLayout>


    </android.support.v4.widget.NestedScrollView>


</android.support.design.widget.CoordinatorLayout>