Answers for "android horizontal separator"

divider android

<View
    android:layout_width="match_parent"
    android:layout_height="1dp"
    android:background="@android:color/darker_gray"/>

code to add horizonatl line in xml

<View
            android:layout_width="2dp"
            android:layout_height="match_parent"
            android:layout_marginTop="4dp"
            android:background="@android:color/darker_gray" />