src/NSWallet/Droid/Resources/drawable/button_ripple.xml
<?xml version="1.0" encoding="utf-8"?>
<!-- in drawable folder-->
<ripple
xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:colorControlHighlight">
<item android:id="@android:id/mask">
<shape android:shape="rectangle">
<solid android:color="?android:colorAccent" />
</shape>
</item>
<item>
<shape android:shape="rectangle">
<solid android:color="#ff0000" />
</shape>
</item>
</ripple>