dart : 펄터 -키보드가 나타나지 않고 선택한 분야에서 머물지 않습니다.

키보드가 제대로 작동하지 않습니다텍스트 필드...에

아래의 code는 14를 넣었습니다텍스트 필드그러나 예를 들어 필드 14에서 클릭 할 때 키보드가 나타나지 않고 그 아래에 있지 않습니다.텍스트 필드도청.

이 키보드 문제가 표시되지 않고 선택한 분야에서 나를 얻지 못하고 있지 않아도 나를 도울 수 있습니까?

import 'package:flutter/material.dart';
void main() {
  runApp(new MaterialApp(home: new HomePage()));
}
class HomePage extends StatefulWidget {
  @override
  HomePageState createState()=> new HomePageState();
}
class HomePageState extends State<HomePage> {
  final TextEditingController _controller= new TextEditingController();
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      body: new Stack(
        children: <Widget>[
          new ListView(
            shrinkWrap: true,
            children: <Widget>[
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 1',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 2',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 3',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 4',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 5',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 6',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 7',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 8',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 9',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 10',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 11',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 12',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 13',
                ),
              ),
              new TextField(
                controller: _controller,
                decoration: new InputDecoration(
                  hintText: 'Type something 14',
                ),
              ),
            ],
          )
        ]
      )
    );
  }
}