Android Toolbar disappear during scrolling with Coordinatorlayout -


a strange thing happened when try implement toolbar coordinatorlayout.

  1. everything seems ok when scroll down , scroll toolbar show correctly

enter image description here

  1. however after scroll down level screen became

enter image description here

the xml below, idea of it, thanks?

<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.v7.widget.recyclerview     android:id="@+id/list"     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="wrap_content">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="?attr/actionbarsize"         android:background="?attr/colorprimary"         android:theme="@style/themeoverlay.appcompat.dark.actionbar"         app:layout_scrollflags="scroll|enteralways"         />  </android.support.design.widget.appbarlayout>

place blank view below toolbar before appbarlayout closing statement. worked me when had problem. 

<android.support.design.widget.appbarlayout     android:id="@+id/appbar"     android:layout_width="match_parent"     android:layout_height="wrap_content">      <android.support.v7.widget.toolbar         android:id="@+id/toolbar"         android:layout_width="match_parent"         android:layout_height="?attr/actionbarsize"         android:background="?attr/colorprimary"         android:theme="@style/themeoverlay.appcompat.dark.actionbar"         app:layout_scrollflags="scroll|enteralways" />      <view         android:id="@+id/appbar_bottom"         android:layout_width="match_parent"         android:layout_height="1dp"         android:background="@android:color/transparent"         android:visibility="invisible" /> </android.support.design.widget.appbarlayout>

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