title: Flutter how to add select option
body: <p>Flutter how can I add a select option I my widget. I need to add something like Radiobutton in this so i can select only one.</p>
  <p>My code</p>
  <pre><code>Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Padding(
              padding: const EdgeInsets.only(left: 20, top: 20, bottom: 12),
              child: Text(
                  'Checkout',
                  style: new TextStyle(
                      fontSize: 20, fontFamily: 'UbuntuBold')),
            ),
  
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Center(
                child: Container(
                  height: Height * 0.06,
                  width: Width * 0.9,
                  decoration: BoxDecoration(
                    // color: Color(0xff04385f),
                    border: Border.all(color: Colors.grey[400]),
                    borderRadius: BorderRadius.only(
                        topLeft: Radius.circular(12),
                        topRight: Radius.circular(12),
                        bottomLeft: Radius.circular(12),
                        bottomRight: Radius.circular(12)),
                  ),
                  child: Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Row(
                      children: [
                        Container(height: Height * 0.022,child: Image.asset('images/cod.png')),
                        SizedBox(width: Width * 0.03,),
                        Text('Cash on delivery', style: TextStyle( color: Color(0xff04385f), fontFamily: 'UbuntuMedium'),)
                      ],
                    ),
                  ),
                ),
              ),
            ),
            Padding(
              padding: const EdgeInsets.all(8.0),
              child: Center(
                child: Container(
                  height: Height * 0.06,
                  width: Width * 0.9,
                  decoration: BoxDecoration(
                    // color: Color(0xff04385f),
                    border: Border.all(color: Colors.grey[400]),
                    borderRadius: BorderRadius.only(
                        topLeft: Radius.circular(12),
                        topRight: Radius.circular(12),
                        bottomLeft: Radius.circular(12),
                        bottomRight: Radius.circular(12)),
                  ),
                  child: Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Row(
                      children: [
                        Container(height: Height * 0.022,child: Image.asset('images/cod.png')),
                        SizedBox(width: Width * 0.03,),
                        Text('Cash on delivery', style: TextStyle( color: Color(0xff04385f), fontFamily: 'UbuntuMedium'),)
                      ],
                    ),
                  ),
                ),
              ),
            )
  
          ],
        ),
  </code></pre>
  <p>Its looks like this right now</p>
  <p><a href="https://i.stack.imgur.com/fHbHh.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fHbHh.png" alt="enter image description here" /></a></p>
  <p>I need to add select option like this</p>
  <p><a href="https://i.stack.imgur.com/1311G.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1311G.png" alt="enter image description here" /></a></p>
  <p>As you can see in image i need to add this slct option so i can select only one option</p>