java - hide actionBar on Swipe vertical viewPager -

i'm trying hide actionbar/toolbar on swipe using vertical viewpager, mainactivity xml:

 <android.support.v4.widget.drawerlayout     xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:ignore="inconsistentlayout">      <android.support.design.widget.coordinatorlayout         android:id="@+id/coordinator_layout"         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:fitssystemwindows="true">              <include                 android:id="@+id/toolbar"                 layout="@layout/view_toolbar" />          </android.support.design.widget.appbarlayout>          <include layout="@layout/view_home" />      </android.support.design.widget.coordinatorlayout>      <include layout="@layout/view_left_drawer" />  </android.support.v4.widget.drawerlayout> 

i added toolbar : app:layout_scrollflags="scroll|enteralways"

i have blank page in fragment, viewpager not visible:

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.nestedscrollview xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:isscrollcontainer="false" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_gravity="fill_vertical" android:background="@color/greeen_theme" android:cliptopadding="false" app:layout_behavior="@string/appbar_scrolling_view_behavior">  <relativelayout xmlns:android="http://schemas.android.com/apk/res/android"             android:background="@color/light_theme_color_read"             android:layout_width="match_parent"             android:layout_height="match_parent">  <button     android:id="@+id/refreshlistbtn"     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_marginbottom="5dp"     android:layout_marginleft="10dp"     android:layout_marginright="10dp"     android:layout_margintop="10dp"     android:background="@drawable/bg_refresh_list_button_selector"     android:textcolor="@android:color/white"     android:visibility="visible"/>  <com.axample.android.view.swiperefreshlayout     android:id="@+id/swiperefresh"     android:layout_width="match_parent"     android:layout_height="match_parent">          <com.axample.android.adapter.vertical.verticalviewpager             android:id="@+id/viewpager"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:paddingbottom="@dimen/pager_padd_botom"             android:cliptopadding="false"/>  </com.axample.android.view.swiperefreshlayout>  </relativelayout>  </android.support.v4.widget.nestedscrollview> 

video : https://www.youtube.com/watch?v=swknazfs6ra

please help!!

update : view_left_drawer.xml

<?xml version="1.0" encoding="utf-8"?> <framelayout xmlns:android="http://schemas.android.com/apk/res/android"          xmlns:tools="http://schemas.android.com/tools"          android:id="@+id/left_drawer"          android:layout_width="240dp"          android:layout_height="match_parent"          android:layout_gravity="start"          android:background="@color/black_main"          tools:showin="@layout/activity_home">  <include layout="@layout/view_drawer_content"/> </framelayout> 

my swiperefreshlayout: https://github.com/fredjul/flym/blob/master/flym/src/main/java/net/fred/feedex/view/swiperefreshlayout.java

problem swiperefreshlayout, should on top of nestedscrollview layout.

<android.support.v4.widget.swiperefreshlayout     <android.support.v4.widget.nestedscrollview    </<android.support.v4.widget.nestedscrollview>  </<android.support.v4.widget.swiperefreshlayout> 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.drawerlayout 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:id="@+id/drawer_layout"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     tools:opendrawer="end"     tools:ignore="inconsistentlayout">      <include         layout="@layout/app_bar_main"         android:layout_width="match_parent"         android:layout_height="match_parent" />      <android.support.design.widget.navigationview         android:id="@+id/nav_view"         android:layout_width="wrap_content"         android:layout_height="match_parent"         android:layout_gravity="end"         android:fitssystemwindows="true"         app:headerlayout="@layout/nav_header_main"         app:menu="@menu/activity_main_drawer" />  </android.support.v4.widget.drawerlayout> 

app_bar_main.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.coordinatorlayout     android:layout_width="match_parent"     android:layout_height="match_parent"     tools:context="com.example.sample.mainactivity"     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     xmlns:android="http://schemas.android.com/apk/res/android">      <android.support.design.widget.appbarlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:theme="@style/apptheme.appbaroverlay"         android:layoutdirection="rtl">          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             android:background="?attr/colorprimary"             app:popuptheme="@style/apptheme.popupoverlay"             app:layout_scrollflags="scroll|enteralways"/>      </android.support.design.widget.appbarlayout>      <include layout="@layout/content_main"/>  </android.support.design.widget.coordinatorlayout> 

content_main.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.swiperefreshlayout     xmlns:app="http://schemas.android.com/apk/res-auto"     xmlns:tools="http://schemas.android.com/tools"     android:id="@+id/swiperefreshlayout"     android:layout_height="match_parent"     android:layout_width="match_parent"     xmlns:android="http://schemas.android.com/apk/res/android">      <android.support.v4.widget.nestedscrollview         android:isscrollcontainer="false"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:background="@color/colorprimary"         android:cliptopadding="false"         tools:context=".mainactivity"         android:fillviewport="true"         app:layout_behavior="@string/appbar_scrolling_view_behavior">          <relativelayout             xmlns:android="http://schemas.android.com/apk/res/android"             android:background="@color/coloraccent"             android:layout_width="match_parent"             android:layout_height="match_parent">              <button                 android:id="@+id/refreshlistbtn"                 android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:layout_marginleft="10dp"                 android:layout_marginright="10dp"                 android:layout_margintop="10dp"                 android:background="@drawable/flat_selector"                 android:textcolor="@android:color/white"                 android:visibility="visible"/>             <textview                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:text="add viewpager instead of textview"                 android:layout_below="@+id/refreshlistbtn"                 android:layout_alignparenttop="true"                 android:layout_alignparentbottom="true"                 android:textcolor="#ffffff"                 android:gravity="center"/>           </relativelayout>     </android.support.v4.widget.nestedscrollview> </android.support.v4.widget.swiperefreshlayout>