Value from FormKey is always empty on Flutter - flutter

Question

I have a simple Screen class dart and a controller for this Screen here is the form:
Container(
height: screenHeight * 0.8,
width: double.infinity,
child: Column(
mainAxisSize: MainAxisSize.min,
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Image(
image: AssetImage('assets/images/cumpra_logo_dark.png'),
height: screenHeight * 0.08,
),
SizedBox(
height: screenHeight * 0.04,
),
Container(
width: double.infinity,
child: Padding(
padding: const EdgeInsets.all(20.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Form(
key: _con.formKey,
child: Column(
children: <Widget>[
Container(
width: screenWidth * 0.7,
child: TextFormField(
style: TextStyle(
fontSize: screenHeight * 0.03,
color: Colors.black,
),
inputFormatters: [
UpperCaseTextFormatter(),
],
textAlign: TextAlign.center,
decoration: InputDecoration(
filled: true,
fillColor: Color(0XFFe0e0e0),
hintText: 'Código da Empresa',
contentPadding: const EdgeInsets.only(
left: 14.0,
bottom: 8.0,
top: 8.0),
focusedBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Colors.white),
borderRadius:
BorderRadius.circular(25.7),
),
enabledBorder: UnderlineInputBorder(
borderSide:
BorderSide(color: Colors.white),
borderRadius:
BorderRadius.circular(25.7),
),
),
validator: (value) {
if (value.isEmpty) {
return 'Campo obrigatório';
}
if (value.length < 6) {
return 'Mínimo de 6 dígitos';
}
return null;
},
onChanged: (String text) {
_con.userDataTemp['pin'] = text;
},
),
),
SizedBox(
height: screenHeight * 0.04,
),
Container(
width: screenWidth * 0.7,
child: TextFormField(
keyboardType: TextInputType.number,
obscureText: true,
autofocus: false,
style: TextStyle(
fontSize: screenHeight * 0.03,
color: Colors.black,
),
textAlign: TextAlign.center,
decoration: InputDecoration(
filled: true,
fillColor: Color(0XFFe0e0e0),
hintText: 'Número de Acesso',
contentPadding: const EdgeInsets.only(
left: 14.0,
bottom: 8.0,
top: 8.0),
focusedBorder: OutlineInputBorder(
borderSide:
BorderSide(color: Colors.white),
borderRadius:
BorderRadius.circular(25.7),
),
enabledBorder: UnderlineInputBorder(
borderSide:
BorderSide(color: Colors.white),
borderRadius:
BorderRadius.circular(25.7),
),
),
validator: (value) {
if (value.isEmpty) {
return 'Campo obrigatório';
}
if (value.length < 6) {
return 'Mínimo de 6 dígitos';
}
return null;
},
onChanged: (String text) {
_con.userDataTemp['code'] = text;
},
),
),
SizedBox(
height: screenHeight * 0.06,
),
Container(
width: screenWidth * 0.7,
child: RaisedButton(
onPressed: _con.signIn,
child: Text('LOGAR'),
padding: EdgeInsets.symmetric(
horizontal: 10.0,
vertical: 12.0,
),
shape: RoundedRectangleBorder(
borderRadius:
BorderRadius.circular(30.0),
),
color: ThemeColor.AppSecundaryColor,
textColor: Colors.white,
elevation: 5,
),
),
SizedBox(
height: 30.0,
),
],
),
),
],
),
),
),
],
),
)
I've already put the KEY here key: _con.formKey, _con reference from my controller here is the code:
LoginController(context) {
this.context = context;
formKey = new GlobalKey<FormState>();
this.scaffoldKey = new GlobalKey<ScaffoldState>();
utilService = Provider.of<UtilService>(context, listen: false);
sharedService = Provider.of<SharedService>(context, listen: false);
userService = Provider.of<UserService>(context, listen: false);
authService = Provider.of<AuthService>(context, listen: false);
}
Why always when i press the button "LOGAR" the code go to this validate:
validator: (value) {
if (value.isEmpty) {
return 'Campo obrigatório';
}
if (value.length < 6) {
return 'Mínimo de 6 dígitos';
}
return null;
},
onChanged: (String text) {
_con.userDataTemp['pin'] = text;
},
But always this value is EMPTY, what I'm missing?

Answer 1

To get the values out of the FormBuilder you must first save the form builder, to do so you must consider doing something like this.
Map json = formKey.currentState.saveAndValidate();