I want to know how to save my current state by modifying the existing JSON file. but I can't find a way to saving..... So I want to ask you about that.
The size of the JSON file is not so big. So I considered total - loading and total - saving when the loading and saving state is called. but I think it is not efficient and unstable... So can I get some help?
please use this package https://pub.dev/packages/shared_preferences
Wraps NSUserDefaults (on iOS) and SharedPreferences (on Android), providing a persistent store for simple data. Data is persisted to disk asynchronously
example code
import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(MaterialApp(
home: Scaffold(
body: Center(
child: RaisedButton(
onPressed: _incrementCounter,
child: Text('Increment Counter'),
),
),
),
));
}
_incrementCounter() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
int counter = (prefs.getInt('counter') ?? 0) + 1;
print('Pressed $counter times.');
await prefs.setInt('counter', counter);
}
