Getting values from all TextFeilds in ListView - flutter

Question

I made a widget consisting of a ListView with three TextFields per item like this.
The widget can contain N addresses as the contact has. When the contact finishes entering their addresses I want to click the save button in appBar to get all the input values from each item of ListView and put in JSON. Something like this:
[
{"Place": "Office", "Street": "Street Name", "PostalCode": "56789"},
{"Place": "Home", "Street": "Street Home", "PostalCode": "57689"},
{"Second Home": "Office", "Street": "Street 2th", "PostalCode": "45342"},
]
This is the code of the widget:
class TestPage2 extends StatefulWidget {
#override
_TestPage2State createState() => _TestPage2State();
}
class _TestPage2State extends State<TestPage2> {
List<Widget> lwidgets = [];
#override
void initState() {
lwidgets.insert(
lwidgets.length,
_Contacts(
indice: 0, onDeleteContact: (int i) => {deleteItemFromList(i)}));
lwidgets.insert(lwidgets.length, _AddElement(() => {addItemToList()}));
super.initState();
}
void addItemToList() {
setState(() {
lwidgets.insert(
lwidgets.length - 1,
_Contacts(
indice: lwidgets.length - 1,
onDeleteContact: (int i) => {deleteItemFromList(i)}));
});
}
void deleteItemFromList(int i) {
setState(() {
lwidgets.removeAt(i);
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('CONTACTS'),
leading: Icon(Icons.arrow_left),
actions: <Widget>[
FlatButton(
onPressed:
() {}, // I want get all values contained of lwidgets. What do i need to do???
child: Text(
'SAVE',
style: TextStyle(color: Colors.white),
),
)
],
),
backgroundColor: Color(0xFFE5E5EA),
body: Column(
children: <Widget>[
Text('ADRESSES'),
Container(
height: 200,
child: ListView.builder(
itemCount: lwidgets.length,
itemBuilder: (BuildContext context, int index) {
return lwidgets[index];
},
physics: NeverScrollableScrollPhysics(),
),
),
],
));
}
}
This is the code of contact info widget:
class _Contacts extends StatelessWidget {
final int indice;
final Function(int) onDeleteContact;
const _Contacts({this.indice = 0, this.onDeleteContact});
#override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
Container(
height: 40,
color: Colors.white,
child: Row(
children: <Widget>[
IconButton(
icon: Icon(Icons.remove_circle),
iconSize: 24,
color: Color(0xFFFF3B30),
onPressed: () {
onDeleteContact(indice);
},
),
Container(
width: 100,
child: TextField(
decoration: InputDecoration(
hintText: 'Place',
border: InputBorder.none,
),
style: TextStyle(fontFamily: 'Lekton'),
),
),
_VerticalDivider(),
Container(
width: 100,
child: TextField(
decoration: InputDecoration(
hintText: 'Street',
border: InputBorder.none,
),
style: TextStyle(fontFamily: 'Lekton'),
),
),
_VerticalDivider(),
Container(
width: 100,
child: TextField(
decoration: InputDecoration(
hintText: 'Postal Code',
border: InputBorder.none,
),
style: TextStyle(fontFamily: 'Lekton'),
),
),
],
),
),
_HorizontalDivider(),
],
);
}
I will be grateful for any help