android layout - CollapsingToobarLayout not always responding to listView scroll event -


so i've got pretty standard xml layout(see below), except tried workaround , wrapped listview in framelayout in order set scroll behavior listview , make appbarlayout respond scroll events. in code, manually call 

.setnestedscrollingenabled(true)

on wrapped listview.

in cases, works totally fine.

<?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"     android:layout_width="match_parent"     android:layout_height="match_parent" >      <android.support.design.widget.appbarlayout         android:layout_width="match_parent"         android:layout_height="200dp"         app:layout_scrollflags="scroll|exituntilcollapsed"         android:fitssystemwindows="true">          <android.support.design.widget.collapsingtoolbarlayout             android:layout_width="match_parent"             android:layout_height="match_parent"             app:contentscrim="?attr/colorprimary"             app:layout_scrollflags="scroll|exituntilcollapsed">              <android.support.v4.view.viewpager                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:fitssystemwindows="true"                 app:layout_collapsemode="parallax" />              <android.support.v7.widget.toolbar                 android:id="@+id/anim_toolbar"                 android:layout_width="match_parent"                 android:layout_height="?attr/actionbarsize"                 android:layout_gravity="top"                 app:layout_collapsemode="pin"                 app:theme="?toolbartheme">                  <textview                     android:id="@+id/title"                     android:layout_width="match_parent"                     android:layout_height="wrap_content" />              </android.support.v7.widget.toolbar>         </android.support.design.widget.collapsingtoolbarlayout>     </android.support.design.widget.appbarlayout>      <framelayout         android:id="@+id/list_container"         android:layout_width="match_parent"         android:layout_height="match_parent"         app:layout_behavior="@string/appbar_scrolling_view_behavior">          <com.app.android.ui.util.scrolltoloadlistview             android:layout_width="match_parent"             android:layout_height="match_parent"/>      </framelayout> </android.support.design.widget.coordinatorlayout>

however, appbarlayout only collapses when fling listview upwards, or else listview scroll underneath appbarlayout(completely covered), weird visually. note when appbarlayout collapse , try scroll listview down, appbarlayout expands no issues.

i've spent time digging whether or not problem specific listview, seems case recyclerview. wondering if has seen issue , explain why 2 components behave independent of each other in non-flinging events.

thanks help!


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