小编use*_*219的帖子

我是新手,我试图在这里执行示例.我只想使用TextField小部件来获取一些用户输入.问题是我找到了"找不到材料小部件".错误.我究竟做错了什么 ？谢谢.

码:

import 'package:flutter/material.dart';    

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


class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      home: new ExampleWidget(),
    );
  }
}


/// Opens an [AlertDialog] showing what the user typed.
class ExampleWidget extends StatefulWidget {
  ExampleWidget({Key key}) : super(key: key);

  @override
  _ExampleWidgetState createState() => new _ExampleWidgetState();
}

/// State for [ExampleWidget] widgets.
class _ExampleWidgetState extends State<ExampleWidget> { …