Files
2019-07-23 03:42:56 +02:00

102 lines
2.2 KiB
Dart

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';
void main() {
runApp(MaterialApp(
// Disable the debug flag
debugShowCheckedModeBanner: false,
// Home
home: MyHome()));
}
class MyHome extends StatefulWidget {
@override
MyHomeState createState() {
return MyHomeState();
}
}
class MyHomeState extends State<MyHome> {
var nameOfApp = "Persist Key Value";
var counter = 0;
// define a key to use later
var key = "counter";
@override
void initState() {
super.initState();
_loadSavedData();
}
_loadSavedData() async {
// Get shared preference instance
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
// Get value
counter = (prefs.getInt(key) ?? 0);
});
}
_onIncrementHit() async {
// Get shared preference instance
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
// Get value
counter = (prefs.getInt(key) ?? 0) + 1;
});
// Save Value
prefs.setInt(key, counter);
}
_onDecrementHit() async {
// Get shared preference instance
SharedPreferences prefs = await SharedPreferences.getInstance();
setState(() {
// Get value
counter = (prefs.getInt(key) ?? 0) - 1;
});
// Save Value
prefs.setInt(key, counter);
}
@override
Widget build(BuildContext context) {
return Scaffold(
// Appbar
appBar: AppBar(
// Title
title: Text(nameOfApp),
),
// Body
body: Container(
// Center the content
child: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'$counter',
textScaleFactor: 10.0,
),
Padding(padding: EdgeInsets.all(10.0)),
RaisedButton(
onPressed: _onIncrementHit,
child: Text('Increment Counter')),
Padding(padding: EdgeInsets.all(10.0)),
RaisedButton(
onPressed: _onDecrementHit,
child: Text('Decrement Counter')),
],
),
),
),
);
}
}