title: Change background color of SearchView button and query
body: <p>For some reason my searchview has a white background instead of transparent and I cant seem to get rid of it.  I am using AppCompat theme.  I am using a <code>ToolBar</code> manually as my <code>ActionBar</code>.</p>
  
  <p><strong>menu.xml</strong></p>
  
  <pre><code>&lt;menu xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto"&gt;
      &lt;item android:id="@+id/search"
          android:title="Search"
          android:icon="@android:drawable/ic_menu_search"
          app:showAsAction="collapseActionView|ifRoom"
          app:actionViewClass="com.exposure.controls.ExposureSearchView" /&gt;
  &lt;/menu&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/7XPxX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7XPxX.png" alt="enter image description here"></a></p>
  
  <pre><code>&lt;style name="LaunchTheme" parent="Theme.AppCompat.Light.NoActionBar"&gt;
          &lt;item name="android:colorBackground"&gt;@color/app_background&lt;/item&gt;
          &lt;item name="android:windowContentOverlay"&gt;@null&lt;/item&gt;
          &lt;item name="android:background"&gt;@android:color/transparent&lt;/item&gt;
          &lt;item name="windowActionBarOverlay"&gt;true&lt;/item&gt;
          &lt;item name="android:windowActionBarOverlay"&gt;true&lt;/item&gt;
          &lt;item name="android:windowFullscreen"&gt;true&lt;/item&gt;
          &lt;item name="windowNoTitle"&gt;true&lt;/item&gt;
          &lt;item name="windowActionBar"&gt;false&lt;/item&gt;
          &lt;item name="searchViewStyle"&gt;@style/MySearchViewStyle&lt;/item&gt;
      &lt;/style&gt;
  
      &lt;style name="MySearchViewStyle" parent="Widget.AppCompat.SearchView"&gt;
          &lt;item name="queryBackground"&gt;@android:color/transparent&lt;/item&gt;
          &lt;item name="submitBackground"&gt;@android:color/transparent&lt;/item&gt;
      &lt;/style&gt;
  </code></pre>