Background color of Toolbar in Lollipop is normal but in Kitkat is white
<p>In Lollipop, The background color of toolbar was shown normally, but in KitKat, it was shown as white color.
I don't know why.</p>

<p>activity_main.xml</p>

<pre><code>&lt;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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity"&gt;

&lt;android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay"&gt;

    &lt;android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:popupTheme="@style/AppTheme.PopupOverlay" /&gt;

&lt;/android.support.design.widget.AppBarLayout&gt;

&lt;include layout="@layout/content_main"/&gt;

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

<p>styles.xml</p>

<pre><code>&lt;resources&gt;
&lt;!-- Base application theme. --&gt;
&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
    &lt;!-- Customize your theme here. --&gt;
    &lt;item name="colorPrimary"&gt;@color/colorPrimary&lt;/item&gt;
    &lt;item name="colorPrimaryDark"&gt;@color/colorPrimaryDark&lt;/item&gt;
    &lt;item name="colorAccent"&gt;@color/colorAccent&lt;/item&gt;
&lt;/style&gt;
&lt;style name="AppTheme.NoActionBar"&gt;
    &lt;item name="windowActionBar"&gt;false&lt;/item&gt;
    &lt;item name="windowNoTitle"&gt;true&lt;/item&gt;
&lt;/style&gt;
&lt;style name="AppTheme.AppBarOverlay"
parent="ThemeOverlay.AppCompat.Dark.ActionBar" /&gt;
&lt;style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" /&gt;
&lt;/resources&gt;
</code></pre>

<p>styles.xml-v21</p>

<pre><code>&lt;resources&gt;

&lt;style name="AppTheme.NoActionBar"&gt;
    &lt;item name="windowActionBar"&gt;false&lt;/item&gt;
    &lt;item name="windowNoTitle"&gt;true&lt;/item&gt;
    &lt;item name="android:windowDrawsSystemBarBackgrounds"&gt;true&lt;/item&gt;
    &lt;item name="android:statusBarColor"&gt;@android:color/transparent&lt;/item&gt;
&lt;/style&gt;
&lt;/resources&gt;
</code></pre>

<p><img src="https://i.stack.imgur.com/yv60Xl.png" alt="enter image description here"></p>