mark item selected gridView android

<GridView
            android:id="@+id/grid_view"
            android:layout_width="fill_parent"
            android:layout_height="160dp"
            android:columnWidth="80dp"
            android:gravity="center"
            android:horizontalSpacing="5dp"
            android:numColumns="3"
            android:stretchMode="columnWidth"
            android:verticalSpacing="5dp">

I have that gridView and I want to paint the edge of the image when I select it, I came up with things to do but nothing of the component itself. Each grid image is an xml and I have the method of the event with every time I click on an image of the gridview, I need to paint it.