android - Recycleview in coordinatorlayout -

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i trying create relativelayout has coordinatorlayout , linearlayout @ bottom , found strange behavior can't resolve. layout

    <?xml version="1.0" encoding="utf-8"?> <relativelayout 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.coordinatorlayout         android:id="@+id/content"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_above="@+id/sender"         android:background="@android:color/white"         android:fitssystemwindows="true">          <android.support.design.widget.appbarlayout             android:id="@+id/appbar"             android:layout_width="match_parent"             android:layout_height="wrap_content">              <android.support.v7.widget.toolbar                 android:id="@+id/toolbar"                 android:layout_width="match_parent"                 android:layout_height="?actionbarsize"                 android:background="?colorprimary"                 app:layout_scrollflags="scroll|enteralways" />          </android.support.design.widget.appbarlayout>          <android.support.v7.widget.recyclerview             android:id="@+id/messages_list"             android:layout_width="match_parent"             android:layout_height="match_parent"             app:layout_behavior="@string/appbar_scrolling_view_behavior" />      </android.support.design.widget.coordinatorlayout>      <linearlayout         android:id="@+id/sender"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:layout_alignparentbottom="true"         android:gravity="center_vertical"         android:background="@android:color/white">          <edittext             android:id="@+id/inputtext"             android:layout_width="0dp"             android:layout_height="wrap_content"             android:layout_weight="1"             android:inputtype="text" />          <button             android:fontfamily="sans-serif"             style="?android:attr/borderlessbuttonstyle"             android:textappearance="?android:textappearancebutton"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="@string/send"             android:textcolor="?colorprimary"             android:id="@+id/send"/>      </linearlayout>  </relativelayout>

after changing data in adapter trying scroll last element ( example recyclerview.smoothscrolltoposition(size); )and see part of last view (not full size). if recycleview not nest coordinatorlayout - works expecting - see full sized last element view. how can change layout works correctly ?

in code remove app:layout_scrollflags="scroll|enteralways" toolbar , instead add appbarlayout should this

<android.support.design.widget.appbarlayout         android:id="@+id/appbar"         android:layout_width="match_parent"         android:layout_height="wrap_content"         app:layout_scrollflags="scroll|enteralways">          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="?actionbarsize"             android:background="?colorprimary"/>  </android.support.design.widget.appbarlayout>

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