how to copy one list to another list in flutter - list

Question

I want to copy user inputs to list1 to another list say list2 and save it, then if user inputs something again that should be inserted in list1 and then again its content should be copied to list2.
Output:
let say user inputs A,B,C then it should be stored in list1.
list1=['A','B','C']
and list2 will be list2=['A','B','C']
then if again user inputs something let's say D,E,F then list1 will be
list1=['D','E','F']
and list2 will be list2=['A','B','C','D','E','F']
and i want that list2 contents on gridview
Here is what i have done:
import 'package:flutter/material.dart';
import 'package:flutter/painting.dart';
class Result extends StatefulWidget {
final Function resetHandler;
final int resultScore;
List textList = [];
Result(this.resultScore, this.textList, this.resetHandler);
#override
_ResultState createState() => _ResultState();
}
class _ResultState extends State<Result> {
List textListCopy;
var resultList;
int index = 0;
String get resultPhrase {
if (widget.resultScore <= 8) {
return 'You are awesome and innocent!';
} else if (widget.resultScore <= 12) {
return 'Pretty likeable!';
} else if (widget.resultScore <= 16) {
return 'You are .... Strange?!';
} else {
return 'You are so Bad!';
}
}
Color colorSelect() {
Color color;
if (widget.textList[0] == 'Blue' &&
widget.textList[1] == 'Rabbit' &&
widget.textList[2] == 'A') {
color = Colors.blue;
} else if (widget.textList[0] == 'Blue' &&
widget.textList[1] == 'Snake' &&
widget.textList[2] == 'B') {
color = Colors.green;
} else if (widget.textList[1] == 'Lion') {
color = Colors.orange;
} else if (widget.textList[2] == 'C') {
color = Colors.yellow;
} else {
color = Colors.white;
}
return color;
}
String indexSelection() {
list2.addAll(widget.list1); //i am copying my list1 to list2 here
print(list2);
return list2[0];
}
#override
Widget build(BuildContext context) {
var size = MediaQuery.of(context).size;
/*24 is for notification bar on Android*/
final double itemHeight = (size.height - kToolbarHeight - 24) / 2;
final double itemWidth = size.width / 2;
return Scaffold(
body: //Center(
//child:
//Column(
// mainAxisAlignment: MainAxisAlignment.center,
//children: <Widget>[
Container(
width: double.infinity,
height: double.infinity,
decoration: BoxDecoration(color: colorSelect()),
child: //Center(
//child:
Column(children: [
Text(
resultPhrase,
//'Hello!!',
style: TextStyle(fontSize: 36, fontWeight: FontWeight.bold),
textAlign: TextAlign.center,
),
ElevatedButton(
onPressed: widget.resetHandler,
child: Text(
'Restart Quiz',
style: TextStyle(fontSize: 28),
textAlign: TextAlign.center,
)),
Expanded(
child: GridView.count(
childAspectRatio: (itemWidth / itemHeight),
controller: new ScrollController(keepScrollOffset: false),
shrinkWrap: true,
padding: EdgeInsets.fromLTRB(10, 20, 10, 0),
scrollDirection: Axis.vertical,
crossAxisCount: 3,
mainAxisSpacing: 10,
children: [
Card(
child: Text(
indexSelection(),
//index += 1;
//textList[index],
//index += 1;
textAlign: TextAlign.center,
),
),
],
))
])) //)
//]) //)
);
}
}
Another file
#override
Widget build(BuildContext context) {
return MaterialApp(
// Hide the debug banner
debugShowCheckedModeBanner: false,
home: Scaffold(
appBar: AppBar(
title: Text('My First App'),
),
body: _questionIndex < _questions.length
? Quiz(
answerQuestion: _answerQuestion,
questionIndex: _questionIndex,
questions: _questions,
)
: Result(_total_score, textList, _resetQuiz))); //here i'm calling _resetQuiz function
void _resetQuiz() {
setState(() {
_questionIndex = 0;
_total_score = 0;
list1= []; //here i'm emptying my list1 everytime when RESET QUIZ button is pressed so that the final screen color changes in the basis of my answer selection
});
Update:
i have tried from.list too, but every when user input something it only display that input, its not storing previous input
String indexSelection() {
print(list1);
list2= List.from(list1);
print(list2);
return list2[0];
}

Answer 1

Try this:
list2.addAll(list1);
Here's a good article about other ways to achieve the same.

Answer 2

You can use
List list2 = [...list1];