how to fix material tab host in android 5+ -

i used (compile 'it.neokree:materialtabs:0.11') libariry create tab in project . have problem . see , there gap between tabs , appbarlayout in android 5 , above. in androids lower version ok. what's problem ?!?!?!

<android.support.design.widget.appbarlayout     android:id="@+id/app_bar"     android:layout_width="match_parent"     android:layout_height="@dimen/_300sdp"     android:fitssystemwindows="true"     android:theme="@style/apptheme.appbaroverlay">      <android.support.design.widget.collapsingtoolbarlayout         android:id="@+id/toolbar_layout"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:fitssystemwindows="true"         app:contentscrim="@color/colorprimary"         app:layout_scrollflags="scroll|exituntilcollapsed">          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="50dp"             app:layout_collapsemode="pin"             android:title=""             app:popuptheme="@style/apptheme.popupoverlay" >          </android.support.v7.widget.toolbar>      </android.support.design.widget.collapsingtoolbarlayout>  </android.support.design.widget.appbarlayout>  <it.neokree.materialtabs.materialtabhost     android:id="@+id/materialtabhost"     android:layout_width="match_parent"     android:layout_height="?attr/actionbarsize"     app:textcolor="#ffffff"     android:layout_gravity="top"     android:layout_below="@id/app_bar"     app:primarycolor="@color/colorprimary"     app:colorprimarydark="#dedede"     app:contentinsetstart="0dp"     app:contentinsetend="0dp"     app:accentcolor="#ffffff"     app:tabgravity="fill"     app:tabmode="scrollable"     android:gravity="bottom"     app:layout_behavior="@string/appbar_scrolling_view_behavior"     tools:context="ir.persianit.doctors.detailactivity"     tools:showin="@layout/detailsdoctors"/>  <android.support.v4.view.viewpager     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_margintop="?attr/actionbarsize"     app:layout_behavior="@string/appbar_scrolling_view_behavior"     tools:context="ir.persianit.doctors.detailactivity"     tools:showin="@layout/detailsdoctors">  </android.support.v4.view.viewpager>  <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"     android:layout_margintop="?attr/actionbarsize"     app:layout_behavior="@string/appbar_scrolling_view_behavior"     tools:context=".main.detailsactivity"     android:isscrollcontainer="true"     android:id="@+id/nest_scrollview"     > </android.support.v4.widget.nestedscrollview> 

try tablayout instead tabhost. hope