android - Toobar drops shadow on TabLayout -

everybody! have fragment in framelayout container within activity, has navigation drawer. fragment has tablayout. , problem is, can see, activity's toolbar drops shadow on fragment's tablayout. dont want place tablayout in activity's appbar layout because won't have access fragment and, moreover, don't need tablayout anywhere else.

this activity_main.xml

<?xml version="1.0" encoding="utf-8"?> 

<include     layout="@layout/app_bar_main"     android:layout_width="match_parent"     android:layout_height="match_parent" />  <android.support.design.widget.navigationview     android:id="@+id/mainnavigationview"     android:layout_width="wrap_content"     android:layout_height="match_parent"     android:layout_gravity="start"     android:fitssystemwindows="true"     app:headerlayout="@layout/nav_header_main"     app:menu="@menu/activity_main_drawer" /> 

and app_bar_main.xml

<?xml version="1.0" encoding="utf-8"?> 

<linearlayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">      <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/logintoolbar"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             android:background="?attr/colorprimary"             app:layout_scrollflags="scroll|enteralways|snap"             app:popuptheme="@style/apptheme.popupoverlay" />      </android.support.design.widget.appbarlayout>      <framelayout         android:id="@+id/mainfragmentcontainer"         android:layout_width="match_parent"         android:layout_height="match_parent" /> </linearlayout> 

this fragment_by_day_schedule.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical">   <android.support.design.widget.tablayout      android:id="@+id/bydaytablayout"      android:layout_width="match_parent"      android:layout_height="wrap_content"      app:tabbackground="?attr/colorprimary"      app:tabmode="scrollable" />  <android.support.v4.view.viewpager     android:id="@+id/bydayviewpager"     android:layout_width="match_parent"     android:layout_height="match_parent" />  </linearlayout> 

i want toolbar hide when scroll list in fragment within viewpager

do have ideas how can achive that?

use this. works on projects.

viewcompat.setelevation(mappbarlayout, 0); 

and second question how hide toolbar? change parent layout linearlayout layout.

<android.support.design.widget.coordinatorlayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical">      <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/logintoolbar"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             android:background="?attr/colorprimary"             app:layout_scrollflags="scroll|enteralways|snap"             app:popuptheme="@style/apptheme.popupoverlay" />      </android.support.design.widget.appbarlayout>      <framelayout         android:id="@+id/mainfragmentcontainer"         android:layout_width="match_parent"         android:layout_height="match_parent" /> </android.support.design.widget.coordinatorlayout> 

after have tell android when toolbar should hide. should tell view can scroll. have add app:layout_behavior="@string/appbar_scrolling_view_behavior" in viewpager.

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical">   <android.support.design.widget.tablayout      android:id="@+id/bydaytablayout"      android:layout_width="match_parent"      android:layout_height="wrap_content"      app:tabbackground="?attr/colorprimary"      app:tabmode="scrollable" />  <android.support.v4.view.viewpager     android:id="@+id/bydayviewpager"     android:layout_width="match_parent"     android:layout_height="match_parent"  app:layout_behavior="@string/appbar_scrolling_view_behavior"/> </linearlayout>