flutter : how to persist a List using shared preferences?
how to persist a List like List<num> = [2.5, 5, 7.5, 10] using SharedPreferences please ?
EDIT : how to convert stored data as String or List<String> to List ?
android dart 
flutter asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
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how to persist a List like List<num> = [2.5, 5, 7.5, 10] using SharedPreferences please ?
EDIT : how to convert stored data as String or List<String> to List ?
android dart flutter asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
add a comment |
how to persist a List like List<num> = [2.5, 5, 7.5, 10] using SharedPreferences please ?
EDIT : how to convert stored data as String or List<String> to List ?
android dart flutter asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
how to persist a List like List<num> = [2.5, 5, 7.5, 10] using SharedPreferences please ?
EDIT : how to convert stored data as String or List<String> to List ?
android dart flutter android dart flutter asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
edited Nov 24 '18 at 9:05
ViralCode
asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
asked Nov 24 '18 at 7:38
ViralCodeViralCode
194
194
add a comment |
add a comment |
2 Answers
2
active
oldest
votes
First, you need to convert your list of integers to a List of Strings,
then you save it in shared preferences.
You do the opposite when loading.
This is a complete example:
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(new MaterialApp(
home: new Scaffold(
body: new Center(
child: new RaisedButton(
onPressed: _save,
child: new Text('Save my list of int'),
),
),
),
));
}
_save() async {
List<int> myListOfIntegers = [1,2,3,4];
List<String> myListOfStrings= myListOfIntegers.map((i)=>i.toString()).toList();
SharedPreferences prefs = await SharedPreferences.getInstance();
List<String> myList = (prefs.getStringList('mylist') ?? List<String>()) ;
List<int> myOriginaList = myList.map((i)=> int.parse(i)).toList();
print('Your list $myOriginaList');
await prefs.setStringList('mylist', myListOfStrings);
}
Don't forget to add this to your pup spec.yaml file:
shared_preferences: ^0.4.3
edited Nov 27 '18 at 3:09
Pang
6,9301664102
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
worked perfectly, just usedList<num>andnum.parse()instead , thanks.
– ViralCode
Nov 24 '18 at 13:35
add a comment |
As per documentation, there is no way to store list of numbers. But you implement it using:
setStringList(String key, List<String> value) → Future<bool>
Saves a list of strings value to persistent storage in the background.
Implementation:
Future<bool> setStringList(String key, List<String> value) =>
_setValue('StringList', key, value);
Another alternate way is like store whole list as a String.
Full documentation can be found in the Flutter packages repository.
Hope this will help you
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
First, you need to convert your list of integers to a List of Strings,
then you save it in shared preferences.
You do the opposite when loading.
This is a complete example:
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(new MaterialApp(
home: new Scaffold(
body: new Center(
child: new RaisedButton(
onPressed: _save,
child: new Text('Save my list of int'),
),
),
),
));
}
_save() async {
List<int> myListOfIntegers = [1,2,3,4];
List<String> myListOfStrings= myListOfIntegers.map((i)=>i.toString()).toList();
SharedPreferences prefs = await SharedPreferences.getInstance();
List<String> myList = (prefs.getStringList('mylist') ?? List<String>()) ;
List<int> myOriginaList = myList.map((i)=> int.parse(i)).toList();
print('Your list $myOriginaList');
await prefs.setStringList('mylist', myListOfStrings);
}
Don't forget to add this to your pup spec.yaml file:
shared_preferences: ^0.4.3
edited Nov 27 '18 at 3:09
Pang
6,9301664102
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
worked perfectly, just usedList<num>andnum.parse()instead , thanks.
– ViralCode
Nov 24 '18 at 13:35
add a comment |
First, you need to convert your list of integers to a List of Strings,
then you save it in shared preferences.
You do the opposite when loading.
This is a complete example:
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(new MaterialApp(
home: new Scaffold(
body: new Center(
child: new RaisedButton(
onPressed: _save,
child: new Text('Save my list of int'),
),
),
),
));
}
_save() async {
List<int> myListOfIntegers = [1,2,3,4];
List<String> myListOfStrings= myListOfIntegers.map((i)=>i.toString()).toList();
SharedPreferences prefs = await SharedPreferences.getInstance();
List<String> myList = (prefs.getStringList('mylist') ?? List<String>()) ;
List<int> myOriginaList = myList.map((i)=> int.parse(i)).toList();
print('Your list $myOriginaList');
await prefs.setStringList('mylist', myListOfStrings);
}
Don't forget to add this to your pup spec.yaml file:
shared_preferences: ^0.4.3
edited Nov 27 '18 at 3:09
Pang
6,9301664102
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
worked perfectly, just usedList<num>andnum.parse()instead , thanks.
– ViralCode
Nov 24 '18 at 13:35
add a comment |
First, you need to convert your list of integers to a List of Strings,
then you save it in shared preferences.
You do the opposite when loading.
This is a complete example:
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(new MaterialApp(
home: new Scaffold(
body: new Center(
child: new RaisedButton(
onPressed: _save,
child: new Text('Save my list of int'),
),
),
),
));
}
_save() async {
List<int> myListOfIntegers = [1,2,3,4];
List<String> myListOfStrings= myListOfIntegers.map((i)=>i.toString()).toList();
SharedPreferences prefs = await SharedPreferences.getInstance();
List<String> myList = (prefs.getStringList('mylist') ?? List<String>()) ;
List<int> myOriginaList = myList.map((i)=> int.parse(i)).toList();
print('Your list $myOriginaList');
await prefs.setStringList('mylist', myListOfStrings);
}
Don't forget to add this to your pup spec.yaml file:
shared_preferences: ^0.4.3
edited Nov 27 '18 at 3:09
Pang
6,9301664102
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
First, you need to convert your list of integers to a List of Strings,
then you save it in shared preferences.
You do the opposite when loading.
This is a complete example:
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(new MaterialApp(
home: new Scaffold(
body: new Center(
child: new RaisedButton(
onPressed: _save,
child: new Text('Save my list of int'),
),
),
),
));
}
_save() async {
List<int> myListOfIntegers = [1,2,3,4];
List<String> myListOfStrings= myListOfIntegers.map((i)=>i.toString()).toList();
SharedPreferences prefs = await SharedPreferences.getInstance();
List<String> myList = (prefs.getStringList('mylist') ?? List<String>()) ;
List<int> myOriginaList = myList.map((i)=> int.parse(i)).toList();
print('Your list $myOriginaList');
await prefs.setStringList('mylist', myListOfStrings);
}
Don't forget to add this to your pup spec.yaml file:
shared_preferences: ^0.4.3
edited Nov 27 '18 at 3:09
Pang
6,9301664102
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
edited Nov 27 '18 at 3:09
Pang
6,9301664102
edited Nov 27 '18 at 3:09
Pang
6,9301664102
edited Nov 27 '18 at 3:09
Pang
6,9301664102
6,9301664102
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
answered Nov 24 '18 at 9:02
Saed NabilSaed Nabil
1,21828
1,21828
worked perfectly, just usedList<num>andnum.parse()instead , thanks.
– ViralCode
Nov 24 '18 at 13:35
add a comment |
worked perfectly, just usedList<num>andnum.parse()instead , thanks.
– ViralCode
Nov 24 '18 at 13:35
worked perfectly, just used
List<num> and num.parse() instead , thanks.– ViralCode
Nov 24 '18 at 13:35
worked perfectly, just used
List<num> and num.parse() instead , thanks.– ViralCode
Nov 24 '18 at 13:35
add a comment |
As per documentation, there is no way to store list of numbers. But you implement it using:
setStringList(String key, List<String> value) → Future<bool>
Saves a list of strings value to persistent storage in the background.
Implementation:
Future<bool> setStringList(String key, List<String> value) =>
_setValue('StringList', key, value);
Another alternate way is like store whole list as a String.
Full documentation can be found in the Flutter packages repository.
Hope this will help you
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
add a comment |
As per documentation, there is no way to store list of numbers. But you implement it using:
setStringList(String key, List<String> value) → Future<bool>
Saves a list of strings value to persistent storage in the background.
Implementation:
Future<bool> setStringList(String key, List<String> value) =>
_setValue('StringList', key, value);
Another alternate way is like store whole list as a String.
Full documentation can be found in the Flutter packages repository.
Hope this will help you
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
add a comment |
As per documentation, there is no way to store list of numbers. But you implement it using:
setStringList(String key, List<String> value) → Future<bool>
Saves a list of strings value to persistent storage in the background.
Implementation:
Future<bool> setStringList(String key, List<String> value) =>
_setValue('StringList', key, value);
Another alternate way is like store whole list as a String.
Full documentation can be found in the Flutter packages repository.
Hope this will help you
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
As per documentation, there is no way to store list of numbers. But you implement it using:
setStringList(String key, List<String> value) → Future<bool>
Saves a list of strings value to persistent storage in the background.
Implementation:
Future<bool> setStringList(String key, List<String> value) =>
_setValue('StringList', key, value);
Another alternate way is like store whole list as a String.
Full documentation can be found in the Flutter packages repository.
Hope this will help you
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
answered Nov 24 '18 at 8:03
Rahul MahadikRahul Mahadik
2,3012925
2,3012925
add a comment |
add a comment |
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