Flutter 键盘使文本字段隐藏

我是新来的扑腾。我添加了一个带有文本字段的表单，当我单击文本字段并且键盘出现时，文本字段会上升。

这是我的代码：

Widget build(BuildContext context) {

MediaQueryData mediaQuery = MediaQuery.of(context);
return new Scaffold(
  body:  new Container(
      color: Colors.purple,
      constraints: new BoxConstraints.expand(),
      padding: EdgeInsets.only(top: 10.0,left: 10.0,right: 10.0, bottom: mediaQuery.viewInsets.bottom, ),
      child: SingleChildScrollView(
        child: Container(
            child: Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  SizedBox(height: 12.0),
                  Text(
                    'What is your Business Name?',
                    style: TextStyle(fontSize: 24.0),
                  ),
                  AppForm(),
                ],
              ),
            padding: EdgeInsets.only(left: 10.0,right: 10.0, bottom: mediaQuery.viewInsets.bottom),
            decoration: BoxDecoration(
              borderRadius: BorderRadius.all(Radius.circular(30.0)),
              color: Colors.white,
                ),
              )
          )
      ),
    );
  }

这是不打开键盘的结果：没有键盘的图像

这是打开键盘后的图像：打开键盘后的图片

这是我的 flutter doctor 输出。

Doctor summary (to see all details, run flutter doctor -v): [√] Flutter 
(Channel beta, v0.5.1, on Microsoft Windows [Version 10.0.17134.165], locale 
en-US) [√] Android toolchain - develop for Android devices (Android SDK 
28.0.0) [√] Android Studio (version 3.1) [!] VS Code, 64-bit edition (version 
1.25.1) [!] Connected devices ! No devices available ! Doctor found issues in 
2 categories.

知道如何解决这个问题吗？

Scaffold(
    resizeToAvoidBottomInset: true,
    // ...
    appBar: AppBar(
      // ...
    ),
)

修复了文本字段被键盘隐藏的问题