Im a beginer in Flutter and here is the problem- im trying to build a form with validation and 'Submit' button which must navigate to a new screen but there is 'NoSuchMethodError: The method 'validate' was called on null' in debuger when i press this button . Here is the code:
class _SignInPage extends State {
final scaffoldKey = GlobalKey();
final formKey = GlobalKey();
String _email;
String _password;
void _submit() {
final form = formKey.currentState;
if (form.validate()) {
form.save();
_performLogin();
}
}
void _performLogin() {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => ConnectPage()),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
key: scaffoldKey,
body: new Container(
margin: new EdgeInsets.symmetric(vertical: 200.0, horizontal: 35.0),
padding: EdgeInsets.all(20.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
key: formKey,
children: [
TextFormField(
keyboardType: TextInputType.emailAddress,
autofocus: false,
decoration: InputDecoration(
contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(20.0)),
labelText: 'Email'),
validator: (val) =>
!val.contains('@') ? 'Not a valid email.' : null,
onSaved: (val) => _email = val,
),
TextFormField(
autofocus: false,
obscureText: true,
decoration: InputDecoration(
hintText: 'Password',
contentPadding: EdgeInsets.fromLTRB(20.0, 10.0, 20.0, 10.0),
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(20.0)),
labelText: 'Password'),
validator: (val) =>
val.length < 6 ? 'Password too short.' : null,
onSaved: (val) => _password = val,
),
Row(mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [
new Row(children: [
FlatButton(
child:
Text('Sign Up', style: TextStyle(color: Colors.black)),
onPressed: () {
Navigator.push(
context,
MaterialPageRoute(builder: (context) => SignUpPage()),
);
},
),
FlatButton(
child:
Text('Sign In', style: TextStyle(color: Colors.black)),
onPressed: () {
// Navigate to second screen when tapped!
},
),
]),
new Row(children: [
Radio(
activeColor: Colors.blue,
value: Colors.grey,
onChanged: (activeColor) {},
),
Text(
"Keep me signed in",
style: new TextStyle(color: Colors.black),
)
])
]),
RaisedButton(
color: Colors.blue,
onPressed: _submit,
child: new Text('Sign in'),
),
],
)),
);
}
}
How can i fix that?
How to add space between two forms?
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