我试图在按Flutter中的一个按钮时显示一个警报对话框。 以下是我的代码
main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
State<StatefulWidget> createState() {
return MyAppState();
}
}
class MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: "Different Widgets",
debugShowCheckedModeBanner: false,
home: showAlertDialog()
);
}
void _dialogResult(String value) {
if (value == "YES") {
print("YES");
} else {
print("NO");
}
Navigator.pop(context);
}
Widget showAlertDialog() {
TextEditingController textEditingController = TextEditingController();
return Scaffold(
appBar: AppBar(
title: Text("Different Widgets"),
),
body: Container(
child: Center(
child: Column(
children: <Widget>[
TextField(
controller: textEditingController,
),
RaisedButton(
onPressed: () {
print("Hi");
AlertDialog dialog = AlertDialog(
title: Text("Hi"),
content: Text(
textEditingController.text,
style: TextStyle(fontSize: 30.0),
),
actions: <Widget>[
FlatButton(
onPressed: () {
_dialogResult("YES");
},
child: Text("YES")),
FlatButton(
onPressed: () {
_dialogResult("NO");
},
child: Text("NO")),
],
);
showDialog(context: context, builder: (BuildContext context) => dialog);
},
child: Text("Click Me"),
)
],
),
),
),
);
}
这与本地化有什么关系,我不能理解。我做了与文档相同的步骤。我能够看到该按钮,但是单击该按钮后,我会不断收到错误消息。我尝试在按钮单击内编写打印语句,并且该打印语句出现在日志中,这肯定与AlertDialog有关。