material design - Android toolbar doesn't expand when scrolling up -


i have toolbar collapses when recyclerview scrolls down, when user scrolls quickly, toolbar doesn't expand. idea wrong?

this behavior shown in video: https://youtu.be/67ntpkw-5xa

layout code :

<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/coordinator_layout" android:layout_width="match_parent" android:layout_height="match_parent">  <android.support.v7.widget.recyclerview     android:id="@+id/recycler_view"     android:layout_width="match_parent"     android:layout_height="match_parent"     app:layout_behavior="@string/appbar_scrolling_view_behavior" />  <android.support.design.widget.appbarlayout     android:id="@+id/appbar"     android:layout_width="match_parent"     android:layout_height="192dp"     android:fitssystemwindows="true"     android:theme="@style/themeoverlay.appcompat.dark.actionbar">      <android.support.design.widget.collapsingtoolbarlayout         android:id="@+id/toolbar_layout"         android:layout_width="match_parent"         android:layout_height="match_parent"         android:fitssystemwindows="true"         app:layout_scrollflags="scroll|exituntilcollapsed">          <android.support.v7.widget.toolbar             android:id="@+id/toolbar"             android:layout_width="match_parent"             android:layout_height="?attr/actionbarsize"             app:layout_collapsemode="pin"             app:popuptheme="@style/themeoverlay.appcompat.light" />      </android.support.design.widget.collapsingtoolbarlayout>  </android.support.design.widget.appbarlayout>  <android.support.design.widget.floatingactionbutton     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="end|bottom"     android:layout_margin="16dp"     android:clickable="true"     android:onclick="showtext"     android:src="@drawable/ic_done_white_24dp"     app:borderwidth="0dp" />

if want expand every time scroll up, should add app:layout_scrollflags="scroll|enteralways" view want shown.

as understand want add collapsingtoolbarlayout.

possible flags:

scroll: flag should set views want scroll off screen - views not use flag, they’ll remain pinned top of screen

enteralways: flag ensures downward scroll cause view become visible, enabling ‘quick return’ pattern

enteralwayscollapsed: when view has declared minheight , use flag, view enter @ minimum height (i.e., ‘collapsed’), re-expanding full height when scrolling view has reached it’s top.

exituntilcollapsed: flag causes view scroll off until ‘collapsed’ (its minheight) before exiting


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