Corner case:
Swipe right to see the edge case.
Edge case:
<ImageButton
android:id="@+id/edge_area_ib_1_example1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_square_icon"
android:contentDescription="@string/edge_area_image"
android:layout_alignParentLeft="true"
android:paddingTop="10dp"
android:background="@drawable/image_border"/>
android:layout_marginBottom="10dp"
android:background="@drawable/image_border"/>
<ImageButton
android:id="@+id/edge_area_ib_2_example1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_square_icon"
android:contentDescription="@string/edge_area_image"
android:layout_alignParentRight="true"
android:paddingTop="10dp"
android:paddingRight="25dp"
android:background="@drawable/image_border"/>