separator.xml

<?xml version="1.0" encoding="utf-8"?>
<View xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:layout_gravity="center"
    android:layout_marginBottom="20dp"
    android:layout_marginStart="20dp"
    android:layout_marginEnd="20dp"
    android:background="@color/colorAccent">
</View>