tab_indicator_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:innerRadius="0dp"
    android:shape="ring"
    android:thickness="10dp"
    android:useLevel="false">
    <solid android:color="@color/skyblue"/>
</shape>