行中对齐文本字段和扁平按钮

下面的代码工作正常,并在文本字段下显示按钮:

import 'package:flutter/material.dart';

class LocationCapture extends StatelessWidget {
  LocationCapture(this.clickCallback, this.tc);
  final TextEditingController tc;
  final VoidCallback clickCallback;

  @override
  Widget build(BuildContext context) {
    return Column(
        mainAxisSize: MainAxisSize.min,
        children: <Widget>[
      //    Row(
      //        children: <Widget>[
                TextField(controller: tc,),
                FlatButton(
                  child: const Icon(Icons.my_location),
                  onPressed: () => clickCallback(),
                )
      //    ])
    ]);
  }
}

我试着加 Row 使它们成单行,但不起作用,并显示空白屏幕!!

**更新**

通过将每个元素包装到一个容器中,我可以将它们放在一行中,但仍然不高兴,因为它要求我分配容器宽度,我需要自动完成:

Row(
    mainAxisAlignment: MainAxisAlignment.center,
    children: <Widget>[
      Container(
          width: 180,
          child: TextField(
              controller: tc,
              enabled: false,
              textAlign: TextAlign.center,
              decoration: InputDecoration.collapsed(hintText: "")
          )
      ),
      Container(
          child: FlatButton(
                 child: const Icon(Icons.my_location),
                 onPressed: () => clickCallback(),
          )
      ),
    ]
);