i want to set transparent background in app icon.

i tried to set transparent background image as a app icon but it’s not working. By default system set a back background color. i also tried to set image assets with transparent background color #00000000 but it’s not working. and also set below code. it’s also not working.

<?xml version="1.0" encoding="utf-8"?>
<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
    <background android:drawable="@android:color/transparent" />
    <foreground android:drawable="@drawable/a2" />
</adaptive-icon>

give me solution for set transparent background of app icon