android - Make FloatingActionButton Disappear Behind Toolbar -

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so have got floatingactionbutton anchored imageview. when scroll down, want fab hide behind toolbar, not hovering on it.

is there way can achieve this? can't seem work. tried use layout_weight didn't work sadly.

current xml layout: 

<android.support.design.widget.appbarlayout     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:theme="@style/apptheme.appbaroverlay">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="?attr/actionbarsize"         android:background="?attr/colorprimary"         app:popuptheme="@style/apptheme.popupoverlay"         android:layout_weight="1000" />  </android.support.design.widget.appbarlayout>  <android.support.v4.widget.nestedscrollview xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     app:layout_behavior="@string/appbar_scrolling_view_behavior" >     <linearlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:orientation="vertical">         <imageview             android:id="@+id/channelbanner"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:src="@drawable/default_banner"             android:adjustviewbounds="true"             android:scaletype="fitcenter" />          <gridlayout             android:layout_width="match_parent"             android:alignmentmode="alignbounds"             android:layout_height="match_parent"             android:layout_centerhorizontal="true"             android:rowcount="6"             android:columncount="2"             android:padding="6dp"             android:id="@+id/channelcontent">             <android.support.v7.widget.cardview                 xmlns:card_view="http://schemas.android.com/apk/res-auto"                 android:layout_gravity="center"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_margintop="8dp"                 card_view:cardcornerradius="2dp"                 card_view:contentpadding="10dp"                 android:layout_row="0"                 android:layout_column="0"                 android:layout_columnspan="2">                 <linearlayout                     android:orientation="horizontal"                     android:layout_width="match_parent"                     android:layout_height="wrap_content">                     <relativelayout                         android:layout_width="100dp"                         android:layout_height="100dp">                         <com.makeramen.roundedimageview.roundedimageview                             android:layout_width="100dp"                             android:layout_height="100dp"                             android:id="@+id/avatarview"                             android:src="@drawable/youtube_default_avatar"                             app:riv_corner_radius="30dip"                             app:riv_border_width="1dip"                             app:riv_border_color="#212121"                             app:riv_mutate_background="true"                             app:riv_tile_mode="repeat"                             app:riv_oval="true"                             android:layout_weight="1"/>                     </relativelayout>                      <linearlayout                         android:orientation="vertical"                         android:layout_width="match_parent"                         android:gravity="right"                         android:layout_gravity="right"                         android:id="@+id/subscriberlayout"                         android:layout_height="wrap_content"                         android:layout_weight="3">                         <it.bjarn.android.subscribercount.customviews.autoresizetextview                             android:layout_width="match_parent"                             android:layout_height="wrap_content"                             android:layout_margintop="12dp"                             android:ellipsize="none"                             android:maxlines="1"                             android:gravity="right"                             android:layout_gravity="right"                             android:text="0"                             android:textsize="48sp"                             android:textcolor="@color/primarytext"                             android:id="@+id/subscribercount"                             android:textstyle="bold" />                          <textview                             android:layout_width="wrap_content"                             android:layout_height="wrap_content"                             android:textappearance="?android:attr/textappearancesmall"                             android:gravity="right"                             android:layout_gravity="right"                             android:text="subscribers"                             android:id="@+id/subscribertext" />                     </linearlayout>                 </linearlayout>             </android.support.v7.widget.cardview>              <android.support.v7.widget.cardview                 xmlns:card_view="http://schemas.android.com/apk/res-auto"                 android:layout_gravity="center"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_margin="5dp"                 card_view:cardcornerradius="2dp"                 card_view:contentpadding="10dp"                 android:layout_margintop="8dp"                 android:layout_row="1"                 android:layout_column="0"                 android:layout_columnspan="2">                 <linearlayout                     android:orientation="vertical"                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:gravity="left"                     android:id="@+id/descriptionlayout">                      <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancesmall"                         android:text="description"                         android:id="@+id/descriptiontitle" />                     <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancelarge"                         android:text="..."                         android:id="@+id/descriptioncontent"                         android:ellipsize="end"                         android:singleline="true"                         android:clickable="true"                         android:onclick="onclick"                         android:textstyle="italic" />                 </linearlayout>             </android.support.v7.widget.cardview>              <android.support.v7.widget.cardview                 xmlns:card_view="http://schemas.android.com/apk/res-auto"                 android:layout_gravity="center"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_margin="5dp"                 card_view:cardcornerradius="2dp"                 card_view:contentpadding="10dp"                 android:layout_margintop="8dp"                 android:layout_row="2"                 android:layout_column="0"                 android:layout_columnspan="2">                 <linearlayout                     android:orientation="vertical"                     android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:gravity="center"                     android:id="@+id/subscriberoldlayout">                     <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancelarge"                         android:text="0"                         android:id="@+id/subscriberoldcount"/>                     <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancesmall"                         android:text="subscribers shown youtube"                         android:id="@+id/subscriberoldtext" />                     <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancelarge"                         android:text="0"                         android:id="@+id/viewscount"/>                     <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancesmall"                         android:text="views"                         android:id="@+id/viewstext" />                      <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancelarge"                         android:text="0"                         android:id="@+id/videoscount"/>                      <textview                         android:layout_width="wrap_content"                         android:layout_height="wrap_content"                         android:textappearance="?android:attr/textappearancesmall"                         android:text="videos"                         android:id="@+id/videostext" />                 </linearlayout>             </android.support.v7.widget.cardview>         </gridlayout>     </linearlayout> </android.support.v4.widget.nestedscrollview>  <android.support.design.widget.floatingactionbutton     android:id="@+id/fab"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_margin="@dimen/fab_margin"     android:src="@drawable/ic_star_grey_400_24dp"     app:layout_anchor="@id/channelbanner"     app:layout_anchorgravity="bottom|end"     app:backgroundtint="@color/youtubeaccent"     android:clickable="true"     android:layout_weight="999" />

click here see what's happening when scrolling.


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