android - make the picture next to each other gridView

Question

im using grid view and the picture seems to have spaces between each other. what should i do to make the picture next to each other?

<GridView 

            android:id="@+id/gridview"
            android:layout_width="30px" 
            android:layout_height="fill_parent"
            android:columnWidth="0dp"
            android:numColumns="3"
            android:verticalSpacing="0dp"
            android:horizontalSpacing="0dp"
            android:stretchMode="columnWidth"
            android:gravity=""
            />