styles.xml

<resources>
  <!-- Customize theme for floating. -->
    <style name="AppTheme.Transparent" parent="Theme.AppCompat.Light.NoActionBar">
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:windowContentOverlay">@null</item>
        <item name="windowNoTitle">true</item>
        <item name="android:windowIsFloating">true</item>
        <item name="android:backgroundDimEnabled">false</item>
    </style>
</resources>