styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
  
  <!-- Your AppTheme or other themes/styles here -->
  
  <!-- The launcher theme. It sets the main window background to the launch_screen drawable -->
  <style name=”AppTheme.Launcher”>
    <item name=”android:windowBackground”>@drawable/launch_screen</item>
    <!-- Optional, on Android 5+ you can modify the colorPrimaryDark color to match the windowBackground color for further branding-->
    <!-- <item name="colorPrimaryDark">@android:color/white</item> -->
  </style>
  
</resources>