Row space between is not separating children

Question

I made a row and I need to separate its children with space between, but it's not separating. This is the code:

Container(
  height: 51,
  child: Row(
    mainAxisAlignment: MainAxisAlignment.spaceBetween,
    children: [
      Container(width: 56, height: 51, child: ImageIcon(AssetImage("assets/images/treadmill.png"))),
      SizedBox(width: 20),
      Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: const [
              Text(
                "EQUIPMENT",
                style: TextStyle(
                  fontSize: 16,
                  fontFamily: "OpenSans",
                  fontWeight: FontWeight.w600
                ),
              ),
              ImageIcon(AssetImage("assets/icons/delete.png"), color: Colors.red)
            ],
          ),
          Text(
            "1234567891235896211234E",
            style: TextStyle(
                fontSize: 14,
                fontFamily: "OpenSans",
                fontWeight: FontWeight.normal
            ),
          ),
        ],
      )
    ],
  ),
),

And this is the result: (ignore the "A" in the word)

I tried to put expanded, spacer, but all the attempts gave an error.

(I don't want to put SizedBox to make this space because there are several types of cell phone screens)

Why does this happen and what to do?

Answer 1

You can use IntrinsicWidth(have some cost)..

 Container(
  height: 51,
  child: Row(
    mainAxisAlignment: MainAxisAlignment.spaceBetween,
    children: [
      Container(
        width: 56,
        height: 51,
        color: Colors.red,
      ),
      IntrinsicWidth(
        child: Column(
          children: [
            Row(
              mainAxisSize: MainAxisSize.max,
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  "EQUIPAMENT",
                  style: TextStyle(
                      fontSize: 16,
                      fontFamily: "OpenSans",
                      fontWeight: FontWeight.w600),
                ),
                Container(
                  width: 4,
                  height: 33,
                  color: Colors.red,
                ),
              ],
            ),
            Text(
              "1234567891235896211234E",
              style: TextStyle(
                  fontSize: 14,
                  fontFamily: "OpenSans",
                  fontWeight: FontWeight.normal),
            ),
          ],
        ),
      )
    ],
  ),
),