Question 74814 in Flutter Question posted in
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"The constructor being called isn't a const constructor", but constructor is not called with `const` – Flutter

I want to try put TextFormField in the row expanded widget, but I can’t seem to put TextFormField anywhere there

Column(
    children: [
      ListTile(
        title: Text('Full Name'),
        subtitle: TextFormField(
          decoration: const InputDecoration(
            border: OutlineInputBorder(
                borderRadius: BorderRadius.all(Radius.circular(8))),
            hintText: 'Full Name',
          ),
        ),
      ),
      SizedBox(
        height: 5,
      ),
      Row(
        children: [
          Expanded(
            child: ListTile(
        title: Text('Department'),
        subtitle: TextFormField(
              decoration: const InputDecoration(
                border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(Radius.circular(8))),
                hintText: '  Department',
              ),
            ),),
          ),
          SizedBox(
            width: 5,
          ),
          Expanded(
            child:ListTile(
        title: Text('Year Of Study'),
        subtitle:  TextFormField(
              decoration: const InputDecoration(
                border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(Radius.circular(8))),
                hintText: '  Year Of Study',
              ),
            ),),
          ),
        ],
      )
    ],
  ),

This is one example of the code I find to put TextFormFields side by side, but got this error:

The constructor being called isn't a const constructor.
Try removing 'const' from the constructor invocation.

TextFormField‘s constructor isn’t being invoked with const in this case. How do I fix this error?

Tags:

2

Answers


  1. 0

    You likely have a parent Widget with a const keyword; check the Column‘s parents and remove any const until the issue is resolved.

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  2. 0

    You can try this code your problem will be resolved you were using the one ListTile outside the row that is why that problem was occurring.

    Column(
    children: [
      const SizedBox(
        height: 50
      ),
      Row(

        children: [
      
       Expanded(
       child: ListTile(
        title: const Text('Full Name'),
        subtitle: TextFormField(
          decoration: const InputDecoration(
            border: OutlineInputBorder(
                borderRadius: BorderRadius.all(Radius.circular(8))),
            hintText: 'Full Name',
          ),
        ),
      ),
       ),
      
          Expanded(
            child: ListTile(
        title: const Text('Department'),
        subtitle: TextFormField(
              decoration: const InputDecoration(
                border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(Radius.circular(8),),),
                hintText: 'Department',
              ),
            ),),
          ),
          const SizedBox(
            width: 5
          ),
          Expanded(
            child:ListTile(
        title: const Text('Year Of Study',style: TextStyle(fontSize: 14.5,fontWeight: FontWeight.w400),),
        subtitle:  TextFormField(
              decoration: const InputDecoration(
                border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(Radius.circular(8))),
                hintText: '  Year Of Study',
              ),
            ),),
          ),
        ],
      )
    ],
  ),
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