Delete textView in listView - flutter

Question

When press the Add button, it will add a TextField. When I click the minus button, I want the TextField get removed. But it keeps deleting the wrong TextField.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
var commentList = List();
TextEditingController _commentsController = TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Sample"),
),
body: SingleChildScrollView(
child: Padding(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(children: [
Text("Comments", style: TextStyle(color: Colors.grey)),
SizedBox(width: 20),
Container(
height: 35,
padding: const EdgeInsets.all(10.0),
child: InkWell(
onTap: () {
setState(() {
commentList.insert(
0, _commentsController.text);
});
},
child: Row(children: [
Icon(
Icons.add,
color: Colors.white,
size: 15,
),
SizedBox(width: 5),
Text(
"Add",
style: TextStyle(color: Colors.white),
)
])),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10.0),
color: const Color(0xff0000ff),
)),
]),
SizedBox(height: 15),
Padding(
padding: EdgeInsets.all(10),
child: _showListViewComments()),
],
))));
}
Widget _showListViewComments() {
return ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
itemCount: commentList.length + 1,
itemBuilder: (BuildContext ctxt, int index) {
if (index < commentList.length) {
return Padding(
padding: EdgeInsets.only(bottom: 10),
child: Row(children: [
Expanded(
child: TextField(
maxLines: 3,
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: const BorderRadius.all(
const Radius.circular(5.0))),
contentPadding: EdgeInsets.all(10),
))),
SizedBox(width: 10),
Container(
width: 30,
height: 30,
child: FloatingActionButton(
backgroundColor: Colors.red,
onPressed: () {
setState(() {
print(index);
commentList.removeAt(index);
});
},
child: Icon(
Icons.remove,
color: Colors.white,
),
))
]));
}
});
}
}
Eg: I have text 1 and text 2. I want delete text 1 instead of text 2.

Answer 1

Every TextField should pair with defined TextEditingController. I edited your code to
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
List<TextEditingController> commentList = List();
//TextEditingController _commentsController = TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text("Sample"),
),
body: SingleChildScrollView(
child: Padding(
padding: EdgeInsets.all(10),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Row(children: [
Text("Comments", style: TextStyle(color: Colors.grey)),
SizedBox(width: 20),
Container(
height: 35,
padding: const EdgeInsets.all(10.0),
child: InkWell(
onTap: () {
setState(() {
commentList.add(TextEditingController());
// commentList.insert(
// 0, _commentsController.text);
});
},
child: Row(children: [
Icon(
Icons.add,
color: Colors.white,
size: 15,
),
SizedBox(width: 5),
Text(
"Add",
style: TextStyle(color: Colors.white),
)
])),
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(10.0),
color: const Color(0xff0000ff),
)),
]),
SizedBox(height: 15),
Padding(
padding: EdgeInsets.all(10),
child: _showListViewComments()),
],
))));
}
Widget _showListViewComments() {
return ListView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
itemCount: commentList.length + 1,
itemBuilder: (BuildContext ctxt, int index) {
if (index < commentList.length) {
return Padding(
padding: EdgeInsets.only(bottom: 10),
child: Row(children: [
Expanded(
child: TextField(
maxLines: 3,
controller: commentList[index],
decoration: InputDecoration(
border: OutlineInputBorder(
borderRadius: const BorderRadius.all(
const Radius.circular(5.0))),
contentPadding: EdgeInsets.all(10),
))),
SizedBox(width: 10),
Container(
width: 30,
height: 30,
child: FloatingActionButton(
backgroundColor: Colors.red,
onPressed: () {
setState(() {
print(index);
commentList.removeAt(index);
});
},
child: Icon(
Icons.remove,
color: Colors.white,
),
))
]));
}
});
}
}