Flutter中的AlertDialog小部件内的单选按钮小部件不起作用 [英] Radio Button widget not working inside AlertDialog Widget in Flutter

问题描述

我希望用户选择单选按钮"中提供的选项，然后再移至我的Flutter应用程序"中的第二页.我正在显示的Alertdialog中显示单选按钮小部件，但选择后单选按钮未更改.

I want user to select the option given in Radio Button before moving to second page in My Flutter Application. I'm showing Radio button widget inside Alertdialog it shows but radio button not changed after selecting.

所有国家/地区类别

floatingActionButton: FloatingActionButton(
      child: Icon(Icons.create),
      onPressed: () {
        return showDialog(
            context: context,
            builder: (context) => AlertDialog(
              title: Text("Select Grade System and No of Subjects"),
              actions: <Widget>[
                    Radio(value: 0, groupValue: groupValue, onChanged: selectRadio),
                    Radio(value: 1, groupValue: groupValue, onChanged: selectRadio),
                    ],
            ));
      },
    ),

selectRadio功能

selectRadio Function

void selectRadio(int value)
{
setState(() {
  groupValue=value;
});
}

推荐答案

正如我所说的，以上评论 showDialog创建了新的上下文，因此调用小部件上的setState不会影响对话框您可以创建命名为MyDialog的新的有状态小部件.>它使用下拉菜单，但您可以以相同的方式实现收音机小部件).

As I said the above comment showDialog creates new context and that setState on the calling widget therefore won't affect the dialog You can create new stateful widget naming MyDialog.Checkout this gist such that you can get it(it uses dropdown but you can implement radio widget in same way).

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