text_field_expanded_column.dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
          body: Column(children: <Widget>[
        Expanded(
          child: ListTile(
              leading: CircleAvatar(
                  backgroundImage: NetworkImage(
                      'https://images.pexels.com/photos/20787/pexels-photo.jpg?auto=compress&cs=tinysrgb&dpr=1&w=500')),
              title: Container(
                  color: Colors.blue,
                  width: 250.0,
                  child: TextFormField(
                      textAlign: TextAlign.center,
                      style: TextStyle(fontSize: 20.0, color: Colors.white),
                      cursorColor: Colors.white,
                      maxLines: null,
                      minLines: null,
                      expands: true,
                      decoration: InputDecoration(
                          hintText: 'Write something...',
                          border: InputBorder.none,
                          hintStyle: TextStyle(
                              fontSize: 20.0, fontWeight: FontWeight.bold),
                          fillColor: Colors.blue)))),
        )
      ])),
    );
  }
}