title: How to remove colorPrimary as the background of Android PreferenceActivity
body: <p>I am using two <code>SwitchPreferences</code> inside a <code>PreferenceCategory</code> and the <code>xml</code> is as follows.
      </p>
  
  <pre><code>&lt;PreferenceCategory 
  android:title="Control usage of the PIN" &gt;
      &lt;SwitchPreference
          android:key="pin_onmessage_onoff"
          android:summary="For Message"
          android:title="Use for Message" /&gt;
      &lt;SwitchPreference
          android:key="pin_onvault_onoff"
          android:summary="For Vault"
          android:title="Use for Vault" /&gt;
  &lt;/PreferenceCategory&gt;
  </code></pre>
  
  <p></p>
  
  <p>The background of each <code>SwitchPreference</code> is the <code>colorPrimary</code> value. My question is how I could remove the background color from the <code>Preferences</code>?</p>
  
  <p>Note : Can't attach a screenshot where Image upload redirects to a blank page.</p>