How to set margin between item on row android table layout

I don't know how to set margin between item on row 

[![enter image description here](https://i.stack.imgur.com/7Lg35.png)](https://i.stack.imgur.com/7Lg35.png)

my code here I think some thing wrong I don't know how to set margin between item on 1st row and 2nd row

```
   <TableRow

        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"

        >

        <ImageView
            android:id="@+id/imageView4"
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_column="0"
            android:background="@drawable/editshape2"
             />

        <ImageView

            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_column="1"
            android:background="@drawable/editshape2"
            />

    </TableRow>

    <TableRow

        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"

        >

        <ImageView
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_column="0"
            android:padding="2dp"
            android:background="@drawable/editshape2"
             />

        <ImageView
            android:layout_width="120dp"
            android:layout_height="120dp"
            android:layout_column="1"
            android:background="@drawable/editshape2"
             />

    </TableRow>

```