Cannot apply decoration to Container in Flutter

Question

After applying border to my Container, it disappears with this error:

Incorrect use of ParentDataWidget.

After commenting decoration. Widget is rendered. But i need to give outline border like this:

I am getting this commenting the decoration:

  Container(
    child: Row(
      children: [
        Container(

          // commenting this line fixes the issue
          decoration: BoxDecoration( borderRadius: BorderRadius.circular(10) ),
          child: Expanded(
            child: Row(
              children: [
                Icon(LineAwesomeIcons.search),
                Expanded(
                  child: TextField(
                    decoration: null,
                    minLines: 1,
                    maxLines: 2,

                    controller: pickupController,
                    onChanged: (val) {

                    },
                  ),
                ),
                Icon(LineAwesomeIcons.times),
              ],
            ),
          ),
        ),
        SizedBox(width: 20,),
        Text('Map'),
      ],
    ),
  )

Answer 1

You can just decorate the TextField.

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Row(
          children: <Widget>[
            Expanded(
              child: TextField(
                decoration: InputDecoration(
                  prefixIcon: const Icon(Icons.search),
                  suffixIcon: const Icon(Icons.close),
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.circular(10),
                    borderSide: const BorderSide(
                      color: Colors.grey,
                      width: 1,
                    ),
                  ),
                ),
              ),
            ),
            FlatButton(
              onPressed: () {},
              materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
              visualDensity: VisualDensity.compact,
              child: const Text('Map'),
            ),
          ],
        ),
      ),
    );
  }
}