android - ViewPager in CoordinatorLayout then scroll tablayout offscreen not working -

i have viewpager in coordinatorlayout this:

    <android.support.design.widget.appbarlayout     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:theme="@style/themeoverlay.appcompat.dark.actionbar">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="?attr/actionbarsize"         android:background="?attr/colorprimary"         app:layout_scrollflags="scroll|enteralways"         app:popuptheme="@style/apptheme"/>      <android.support.design.widget.tablayout         android:id="@+id/tab_layout"         android:layout_width="match_parent"         android:layout_height="wrap_content"         app:tabmode="scrollable"/> </android.support.design.widget.appbarlayout>  <android.support.v4.view.viewpager xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/pager"     android:layout_width="match_parent"     android:layout_height="match_parent"     app:layout_behavior="@string/appbar_scrolling_view_behavior" /> 

and in viewpager, each fragment webview.

the code can run when scroll webview. tablayout offscreen not working. @ header.

update:

i try use relativelayout content views , use nestedscrollview relativelayout's parent webview disappeared(progressbar showed fine). bug???

here fragment layout:

<android.support.v4.widget.nestedscrollview xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/nestedscrollview" android:layout_width="match_parent" android:layout_height="match_parent">  <relativelayout     android:layout_width="match_parent"     android:layout_height="match_parent"     android:minheight="300dp">      <progressbar         android:id="@+id/pb"         style="?android:attr/progressbarstylehorizontal"         android:layout_width="fill_parent"         android:layout_height="2dp"         android:indeterminateonly="false"         android:max="100"         android:progressdrawable="@drawable/progress_bar_states"></progressbar>      <com.handmark.pulltorefresh.library.pulltorefreshwebview         android:id="@+id/webview"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:layout_below="@id/pb" /> </relativelayout>  </android.support.v4.widget.nestedscrollview> 

for having issue content not showing when using nestedscrollview,add "fillviewport" xml:

<android.support.v4.widget.nestedscrollview   xmlns:android="http://schemas.android.com/apk/res/android"   android:id="@+id/nestedscrollview"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:fillviewport="true">