Scrollview not working with viewpager android -

<?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" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@android:color/white" tools:context="com.app.trainingapp.home.activity.productinfodetail">  <android.support.design.widget.appbarlayout     android:id="@+id/appbar"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:theme="@style/apptheme.appbaroverlay"     android:visibility="visible">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="@dimen/toolbar_height"         android:background="@color/colorprimary"         android:visibility="visible"         app:contentinsetend="0dp"         app:contentinsetleft="0dp"         app:contentinsetright="0dp"         app:contentinsetstart="0dp"         app:layout_collapsemode="parallax"         app:layout_scrollflags="scroll|enteralways"         app:popuptheme="@style/apptheme.popupoverlay">          <include layout="@layout/toolbar_product_detail" />     </android.support.v7.widget.toolbar> </android.support.design.widget.appbarlayout>  <android.support.v4.widget.nestedscrollview     android:id="@+id/detail_view_pager"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:layout_below="@id/appbar"     android:fillviewport="true"     android:focusableintouchmode="true"     app:layout_behavior="@string/appbar_scrolling_view_behavior">      <linearlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical">          <relativelayout             android:layout_width="match_parent"             android:layout_height="match_parent">               <linearlayout                 android:id="@+id/top_container"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:orientation="horizontal"                 android:weightsum="1">                  <linearlayout                     android:layout_width="0dp"                     android:layout_height="wrap_content"                     android:layout_weight="0.4">                      <imageview                         android:layout_width="wrap_content"                         android:layout_height="@dimen/product_detail_top_height"                         android:padding="@dimen/product_image_padding"                         android:src="@drawable/product" />                 </linearlayout>                  <linearlayout                     android:layout_width="0dp"                     android:layout_height="@dimen/product_detail_top_height"                     android:layout_weight="0.6"                     android:gravity="center_vertical|center_horizontal">                      <com.app.trainingapp.customviews.typefacedtextview                         android:layout_width="match_parent"                         android:layout_height="wrap_content"                         android:layout_marginright="10dp"                         android:ellipsize="end"                         android:text="@string/dummy_text"                         android:textcolor="@color/faint_black"                         app:customtypeface="ralewayregular" />                 </linearlayout>             </linearlayout>              <view                 android:id="@+id/separator"                 android:layout_width="match_parent"                 android:layout_height="0.5dp"                 android:layout_below="@id/top_container"                 android:layout_marginleft="@dimen/view_margin_left"                 android:layout_marginright="@dimen/view_margin_left"                 android:background="@color/view_color_grey" />              <com.app.trainingapp.customviews.typefacedtextview                 android:id="@+id/txt_medication"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_below="@id/separator"                 android:layout_margintop="@dimen/top_10"                 android:paddingleft="@dimen/left_10"                 android:text="@string/str_medication"                 android:textallcaps="true"                 android:textcolor="@android:color/black"                 android:textsize="@dimen/font_medication"                 app:customtypeface="ralewaybold" />              <com.app.trainingapp.utils.flowlayout                 android:id="@+id/flow_container"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_below="@id/txt_medication"                 android:layout_margintop="@dimen/top_10"                 android:paddingleft="20dp"                 android:visibility="visible"                 app:horizontalspacing="@dimen/flow_item_horizaontal_spacing"                 app:orientation="horizontal"                 app:verticalspacing="@dimen/flow_item_vertical_spacing" />              <com.app.trainingapp.customviews.customviewpager                 android:id="@+id/medication_pager"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:layout_below="@id/flow_container"                 android:layout_margintop="@dimen/top_10">                  <android.support.design.widget.tablayout                     android:id="@+id/medication_tabs"                     android:layout_width="match_parent"                     android:layout_height="@dimen/tab_layout_height"                     android:layout_gravity="top"                     android:background="@drawable/tablayout_line"                     app:tabindicatorcolor="@color/tab_selector_color"                     app:tabmode="scrollable" />                 <!--<view-->                 <!--android:layout_width="match_parent"-->                 <!--android:layout_height="0.5dp"-->                 <!--android:layout_below="@id/medication_tabs"-->                 <!--android:background="@color/view_color_grey" />-->              </com.app.trainingapp.customviews.customviewpager>         </relativelayout>     </linearlayout>  </android.support.v4.widget.nestedscrollview> 

check above xml, have viewpager insite nestedscrollview, want scroll whole page viewpager? problem when try scroll page it's not working , viewpager scrolls internally. please let me know if wrong in code.