JAVA

Imageview on the bottom left of Imageview android anchor

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <RelativeLayout
        android:id="@+id/layoutTop"
        android:layout_width="match_parent"
        android:layout_height="200dp" >
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/layoutBottom"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_alignParentBottom="true"
        android:layout_below="@id/layoutTop" >
    </RelativeLayout>

    <ImageView
        android:id="@+id/overlapImage"
        android:layout_width="wrap_content"
        android:layout_height="40dp"
        android:layout_above="@id/layoutBottom"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="-20dp" <!-- This should be always half the height, can also be calculated and added programtically -->
        android:adjustViewBounds="true"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>