<GridView
        android:id="@+id/lettersGrid"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/adView"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="5dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:columnWidth="20dp"
        android:gravity="center"
        android:horizontalSpacing="2dp"
        android:listSelector="@drawable/letter_grid_selector"
        android:numColumns="8"
        android:stretchMode="columnWidth"
        android:verticalSpacing="2dp" />