<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape android:shape="rectangle"/>
    </item>
    <item
        android:bottom="0dp"
        android:left="-100dp"
        android:right="-100dp"
        android:top="-80dp">
        <shape android:shape="oval">
            <solid android:color="@color/darkViolet" />
        </shape>
    </item>
</layer-list>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="130dp"
    android:background="@drawable/curve_header_bg" />