nextcloud-android/res/drawable/indicator_dot_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:bottom="2dp" android:top="2dp" android:right="2dp" android:left="2dp">
        <shape
            android:shape="oval">
            <solid android:color="@color/owncloud_blue_accent"/>
            <size android:width="8dp" android:height="8dp" />
        </shape>
    </item>
</layer-list>