XML : How to hide toolbar fully under status bar when scrolling recyclerview

I try to make scrolling behavior for toolbar as embodied in Google Photo. But my toolbar not hiding fully under status bar.

  <android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  android:layout_width="match_parent"  android:layout_height="match_parent">  <android.support.design.widget.AppBarLayout      android:id="@+id/appbar"      android:layout_width="match_parent"      android:layout_height="wrap_content"      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">      <android.support.v7.widget.Toolbar          android:id="@+id/toolbar"          android:layout_width="match_parent"          android:layout_height="wrap_content"          android:background="@color/colorPrimary"          app:layout_scrollFlags="scroll|enterAlways|snap" />  </android.support.design.widget.AppBarLayout>  <android.support.v7.widget.RecyclerView      android:id="@+id/rv"      android:layout_width="match_parent"      android:layout_height="match_parent"      android:clipToPadding="false"      android:clipChildren="false"      app:layout_behavior="@string/appbar_scrolling_view_behavior" />