Flutter form saved error Have a formKey but I'm still getting an error
This my code
class _TextFormFieldsState extends State<TextFormFields> {
String _name = "";
final formKey = GlobalKey<FormState>();
@override
Widget build(BuildContext context) {
return Theme(
data: Theme.of(context).copyWith(
primaryColor: Colors.red,
accentColor: Colors.purpleAccent,
errorColor: Colors.black
),
child: Scaffold(
floatingActionButton: FloatingActionButton(
onPressed: () {},
child: Icon(Icons.save),
),
appBar: AppBar(
title: Text("Text Form Field"),
),
body: Padding(
padding: EdgeInsets.all(20),
child: Form(
key: formKey,
autovalidateMode: AutovalidateMode.always,
child: ListView(
children: [
TextFormField(
decoration: InputDecoration(
prefixIcon: Icon(Icons.account_circle),
hintText: "Your Name",
labelText: "FullName",
border: OutlineInputBorder(
borderRadius: BorderRadius.all(Radius.circular(10)),
),
),
validator: (value) {
if (value == null || value.isEmpty) {
return 'Please enter some text';
}
return null;
},
onSaved: (String? value) {
_name = value.toString();
},
),
ElevatedButton(
onPressed: () {
// Validate returns true if the form is valid, or false otherwise.
if (formKey.currentState!.validate()) {
formKey.currentState.save();
debugPrint("Girilen ad $_name");
}
},
child: Text('Submit'),
),
],
),
),
),
),
);
}
}
This is due to Dart
's flow analysis
.
Your formKey
is an instance variable and thus it cannot be detected by flow analysis that it is definitely not null
even after your if
check.
Use it like this instead formKey.currentState!.save();