toolbar turns to blank while scrolling the view
<p>am using coordinator layout for hiding the toolbar but the problem is in some devices (android 4.4)am getting blank toolbar while scrolling the list ,please help me </p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;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:fitsSystemWindows="true"
    android:orientation="vertical"&gt;

    &lt;android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar_layout"
        android:layout_width="match_parent"

        android:layout_height="?attr/actionBarSize"&gt;

        &lt;android.support.v7.widget.Toolbar
            android:id="@+id/n_toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:theme="@style/ToolbarColoredBackArrow"
            app:layout_scrollFlags="scroll|enterAlways"
            android:minHeight="?attr/actionBarSize"&gt;

            &lt;ViewStub
                android:id="@+id/toolbar_view_stub"
                android:layout_width="match_parent"
                android:background="@color/primary"
                android:layout_height="match_parent" /&gt;
        &lt;/android.support.v7.widget.Toolbar&gt;
    &lt;/android.support.design.widget.AppBarLayout&gt;
    &lt;!--add your layout content here --&gt;


    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"&gt;

        &lt;View
            style="@style/match_wrap"
            android:layout_height="0.5dp"
            android:background="@color/accent" /&gt;

        &lt;ViewStub
            android:id="@+id/content_area"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" /&gt;
    &lt;/LinearLayout&gt;
    &lt;android.support.design.widget.FloatingActionButton

        android:id="@+id/fab_refine"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:visibility="gone"
        android:layout_marginBottom="50dp"
        android:layout_marginRight="50dp"

        app:backgroundTint="@color/color_blue" /&gt;


&lt;/android.support.design.widget.CoordinatorLayout&gt;
</code></pre>

<p><a href="https://i.stack.imgur.com/WbFUz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WbFUz.png" alt="enter image description here"></a></p>