import 'package:flutter/material.dart';

void main() => runApp(
  MaterialApp(
    title: '水平Row示例',
    home: MyApp(),
  ),
);

class MyApp extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('水平Row示例'),
      ),
      body: Row(
        children: <Widget>[
          Expanded(
            child: Text('左侧', textAlign: TextAlign.left),
          ),
          Expanded(
            child: Text('中间', textAlign: TextAlign.center),
          ),
          //右侧图标
          Expanded(
            child: Text('右侧', textAlign: TextAlign.right),
          ),
        ],
      ),
    );
  }
}