android - ViewPager fragments' layout not displayed -


i have child activity uses collapsingtoolbarlayout , tablayout. need use viewpager display tabs' fragments, fragments not displayed @ all, though oncreateview event called correctly.

if replace viewpager element simple textview displayed correctly.

here code i'm using:

activity

<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.coordinatorlayout     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"     xmlns:fresco="http://schemas.android.com/apk/res-auto"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:fitssystemwindows="true"     tools:context=".ui.comicbookactivity">      <android.support.design.widget.appbarlayout         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:fitssystemwindows="true"         android:theme="@style/apptheme.appbaroverlay">          <android.support.design.widget.collapsingtoolbarlayout             android:background="@color/colorprimary"             android:layout_width="match_parent"             android:layout_height="210dip"             app:layout_scrollflags="scroll|exituntilcollapsed"             app:contentscrim="?attr/colorprimary"             app:expandedtitlemarginstart="48dp"             app:expandedtitlemarginend="64dp"             android:fitssystemwindows="true"             android:id="@+id/collapsing_toolbar">              <com.facebook.drawee.view.simpledraweeview                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 app:layout_collapsemode="parallax"                 android:id="@+id/imageviewprofile"                 android:scaletype="fitstart"                 fresco:placeholderimagescaletype="centercrop"                 android:fitssystemwindows="true"                 />              <android.support.v7.widget.toolbar                 android:id="@+id/toolbar"                 android:layout_width="match_parent"                 android:layout_height="?attr/actionbarsize"                 app:popuptheme="@style/apptheme.popupoverlay"                 android:fitssystemwindows="true"                 app:layout_collapsemode="pin">               </android.support.v7.widget.toolbar>           </android.support.design.widget.collapsingtoolbarlayout>         <android.support.design.widget.tablayout             android:id="@+id/tablayout"             android:scrollbars="horizontal"             android:layout_below="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:background="@color/tabcolor"             app:layout_scrollflags="scroll|enteralways"             app:tabmode="scrollable"/>     </android.support.design.widget.appbarlayout>      <include layout="@layout/content_comic_book" />   </android.support.design.widget.coordinatorlayout>

content_comic_book.xml

<?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:id="@+id/scroll"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:cliptopadding="false"     android:scrollbars="vertical"     app:layout_behavior="@string/appbar_scrolling_view_behavior">      <include layout="@layout/content_chapters" />  </android.support.v4.widget.nestedscrollview>

content_chapters.xml

<?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"     app:layout_behavior="@string/appbar_scrolling_view_behavior"     tools:context=".ui.comicbookactivity"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="@color/light_background"     android:paddingbottom="@dimen/activity_vertical_margin"     android:paddingleft="@dimen/activity_horizontal_margin"     android:paddingright="@dimen/activity_horizontal_margin"     android:paddingtop="@dimen/activity_vertical_margin">      <android.support.v4.view.viewpager         android:id="@+id/viewpager"         android:layout_width="match_parent"         android:layout_height="match_parent"         app:layout_behavior="@string/appbar_scrolling_view_behavior" />  </relativelayout>

and activity class:

@override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity);  // configuring toolbar actionbar         setsupportactionbar((toolbar) findviewbyid(r.id.toolbar));         getsupportactionbar().setdisplayhomeasupenabled(true);          viewpager = (viewpager) findviewbyid(r.id.viewpager);         setupviewpager(viewpager);          tablayout = (tablayout) findviewbyid(r.id.tablayout);         setuptablayout(tablayout);      private void setupviewpager(viewpager viewpager) {         viewpageradapter adapter = new viewpageradapter(getsupportfragmentmanager());         adapter.addfragment(new aboutcomicbookfragment(), getstring(r.string.label_about));         adapter.addfragment(new comicbookchaptersfragment(), getstring(r.string.label_chapters));         viewpager.setadapter(adapter);     }      private void setuptablayout(tablayout tablayout) {         tablayout.setupwithviewpager(viewpager);     }       class viewpageradapter extends fragmentpageradapter {         private final list<fragment> mfragmentlist = new arraylist<>();         private final list<string> mfragmenttitlelist = new arraylist<>();          public viewpageradapter(fragmentmanager manager) {             super(manager);         }          @override         public fragment getitem(int position) {             return mfragmentlist.get(position);         }          @override         public int getcount() {             return mfragmentlist.size();         }          public void addfragment(fragment fragment, string title) {             mfragmentlist.add(fragment);             mfragmenttitlelist.add(title);         }          @override         public charsequence getpagetitle(int position) {             return mfragmenttitlelist.get(position);         }     }

what wrong code?

from quick @ code seem me wrapping viewpager in nestedscrollview , relativelayout unnecessary. should able @ least remove nestedscrollview , possibly relativelayout moving necessary attributes viewpager instead.

so here's try verify:

  • replace include reference content_comic_book content_chapters in activity layout
  • remember move app:layout_behaviour attribute viewpager

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