如何在Flutter ListView中获取数据

Question

我正在构建一个运输表单，并能够添加尽可能多的项目(每次按下按钮都在ListView中添加一个小部件(

我的问题是，一旦创建并填充了表单小部件，我如何从每个小部件中的每个TextFormField获得信息一旦检索到信息，我将把它发送到Firebase。

这是我的代码：

import 'package:flutter/material.dart';
import 'package:flutter_login_test/helpers/constants.dart';
class AddItemsToRequest extends StatefulWidget {
const AddItemsToRequest({Key? key}) : super(key: key);
@override
State<AddItemsToRequest> createState() => _AddItemsToRequestState();
}
class _AddItemsToRequestState extends State<AddItemsToRequest> {
List<TextEditingController> controllers = [];
List<Widget> fields = [];
RegExp regExp = RegExp('[aA-zZ]');
int quantity = 0;
double weight = 0;
double height = 0;

Widget itemForm() {
return Column(children: [
Container(
decoration:
BoxDecoration(color: grey, border: Border.all(color: black)),
width: double.infinity,
child: const Center(
child: Text('Package details',
style: TextStyle(
fontWeight: FontWeight.bold,
backgroundColor: grey,
fontSize: 24)),
)),
Row(
children: [
Flexible(
child: TextFormField(
onChanged: (value) {
quantity = value as int;
},
keyboardType: TextInputType.number,
validator: (value) => value!.isEmpty || value is int
? 'Quantity cannot be empty'
: null,
autovalidateMode: AutovalidateMode.onUserInteraction,
decoration: const InputDecoration(
errorStyle: TextStyle(color: Colors.redAccent),
border: OutlineInputBorder(
borderSide: BorderSide(),
borderRadius: BorderRadius.all(
Radius.circular(0.0),
),
),
fillColor: Color.fromARGB(255, 238, 238, 238),
filled: true,
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.blueAccent, width: 2.5),
),
hintText: "Quantity : "),
),
),
Flexible(
child: TextFormField(
onChanged: (value) {
weight = value as double;
},
keyboardType: TextInputType.number,
validator: (value) => value!.isEmpty || regExp.hasMatch(value)
? 'Weight cannot be empty'
: null,
autovalidateMode: AutovalidateMode.onUserInteraction,
decoration: const InputDecoration(
errorStyle: TextStyle(color: Colors.redAccent),
border: OutlineInputBorder(
borderSide: BorderSide(),
borderRadius: BorderRadius.all(
Radius.circular(0.0),
),
),
fillColor: Color.fromARGB(255, 238, 238, 238),
filled: true,
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.blueAccent, width: 2.5),
),
hintText: "Weight : "),
),
),
Flexible(
child: TextFormField(
onChanged: (value) {
height = value;
},
validator: (value) => value!.isEmpty ? 'Height cannot be empty' : null,
autovalidateMode: AutovalidateMode.onUserInteraction,
decoration: const InputDecoration(
errorStyle: TextStyle(color: Colors.redAccent),
border: OutlineInputBorder(
borderSide: BorderSide(),
borderRadius: BorderRadius.all(
Radius.circular(0.0),
),
),
fillColor: Color.fromARGB(255, 238, 238, 238),
filled: true,
focusedBorder: OutlineInputBorder(
borderSide: BorderSide(color: Colors.blueAccent, width: 2.5),
),
hintText: "Height : "),
),
),
],
),
]);
}

Widget _addTile() {
return ElevatedButton(
child: const Icon(Icons.add),
onPressed: () async {
final controller = TextEditingController();
final field = itemForm();
setState(() {
controllers.add(controller);
fields.add(field);
});
});
}
Widget _listView() {
return ListView.builder(
scrollDirection: Axis.vertical,
shrinkWrap: true,
itemCount: fields.length,
itemBuilder: (context, index) {
final item = fields[index];
return Dismissible(
key: ObjectKey(item),
onDismissed: (direction) {
// Remove the item from the data source.
setState(() {
fields.removeAt(index);
});
ScaffoldMessenger.of(context)
.showSnackBar(const SnackBar(content: Text('Package removed')));
},
background: Container(
color: const Color.fromARGB(255, 210, 31, 19),
child: const Center(
child: Text(
'Remove ',
style: TextStyle(
color: white, fontWeight: FontWeight.bold, fontSize: 32),
),
)),
child: Container(
width: double.infinity,
margin: const EdgeInsets.all(5),
child: fields[index],
),
);
},
);
}
Widget _okButton() {
return ElevatedButton(
onPressed: () {
for (var element in fields) {
print(quantity);
}
Navigator.of(context).pop();
print('ok');
},
child: const Text("OK"),
);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(backgroundColor: blue),
body: Column(
mainAxisSize: MainAxisSize.max,
children: [
Flexible(child: _addTile()),
SizedBox(
height: MediaQuery.of(context).size.height - 200,
child: _listView()),
Flexible(child: _okButton()),
],
),
);
}
}

Answer 1

我想您正期待着这个答案。迭代您的texteditingcontroller列表，并逐个获取存储在控制器中的文本。

for (int i = 0; i < controllers.length; i++) {
var data = controllers[i].text;
//print or add data to any other list and insert to another list and save to database
}