android - Viewpager not appearing when using CollapsingToolbarLayout -


i've been playing around design support library , have come across little problem hope can me out with.

i'm using collapsingtoolbar contain imageview collapses in parralax. in collapsingtoolbar, alse have tablayout supposed scroll viewpager. issue viewpager doesn't appear. issue seems arise when set viewpager layout_height match_parent or wrap_content. if set 600dp, problem gone view ends being fixed length isn't nice.

any grealty appreciated!

here's xml

<android.support.design.widget.coordinatorlayout   xmlns:android="http://schemas.android.com/apk/res/android"   xmlns:app="http://schemas.android.com/apk/res-auto"   android:id="@+id/main_content"   android:layout_width="match_parent"   android:layout_height="match_parent"   android:fitssystemwindows="true">    <android.support.design.widget.appbarlayout     android:id="@+id/appbar"     android:layout_width="match_parent"     android:layout_height="@dimen/detail_backdrop_height"     android:theme="@style/themeoverlay.appcompat.dark.actionbar"     android:fitssystemwindows="true"     >      <android.support.design.widget.collapsingtoolbarlayout         android:id="@+id/collapsing_toolbar"         android:layout_width="match_parent"         android:layout_height="match_parent"         app:layout_scrollflags="scroll|exituntilcollapsed"         android:fitssystemwindows="true"         app:contentscrim="?attr/colorprimary"         >          <imageview             android:id="@+id/backdrop"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:fitssystemwindows="true"             app:layout_collapsemode="parallax"             android:src="@drawable/stock_image"/>          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             app:popuptheme="@style/themeoverlay.appcompat.light"             android:layout_gravity="top"             />          <android.support.design.widget.tablayout             android:id="@+id/tabs"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_gravity="bottom"/>      </android.support.design.widget.collapsingtoolbarlayout>    </android.support.design.widget.appbarlayout>   <android.support.v4.widget.nestedscrollview     android:layout_width="match_parent"     android:layout_height="match_parent">      <linearlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:orientation="vertical"         >          <android.support.v4.view.viewpager             android:id="@+id/viewpager"             android:layout_width="match_parent"             android:layout_height="match_parent"             android:background="@android:color/white"             app:layout_behavior="@string/appbar_scrolling_view_behavior"             />     </linearlayout>   </android.support.v4.widget.nestedscrollview>  </android.support.design.widget.coordinatorlayout>

you should remove nestedscrollview , linearlayout levels between coordinatorlayout , viewpager:

<android.support.design.widget.coordinatorlayout>   <android.support.design.widget.appbarlayout>       ...   </android.support.design.widget.appbarlayout>    <android.support.v4.view.viewpager     android:id="@+id/viewpager"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@android:color/white"     app:layout_behavior="@string/appbar_scrolling_view_behavior" />  </android.support.design.widget.coordinatorlayout>

the view app:layout_behavior="@string/appbar_scrolling_view_behavior must direct child of coordinatorlayout positioned correctly in relation appbarlayout.


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