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| // Copyright 2019 Joshua de Guzman (https://jmdg.io). All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
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| import 'package:flutter/material.dart'; | ||
| import 'package:shared_preferences/shared_preferences.dart'; | ||
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| class SharedPreferenceView extends StatefulWidget { | ||
| @override | ||
| State<StatefulWidget> createState() { | ||
| return SharedPreferenceViewState(); | ||
| } | ||
| } | ||
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| class SharedPreferenceViewState extends State<SharedPreferenceView> { | ||
| final String KEY_COUNTER = 'counter'; | ||
| int _counter = 0; | ||
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| @override | ||
| void initState() { | ||
| super.initState(); | ||
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| // Update view with the initial value | ||
| _retrievePersistedCounter(); | ||
| } | ||
|
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Column( | ||
| crossAxisAlignment: CrossAxisAlignment.start, | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: <Widget>[ | ||
| Text( | ||
| 'Storing simple data (shared_preferences 0.5.2)', | ||
| style: TextStyle( | ||
| fontSize: 14, | ||
| fontWeight: FontWeight.bold, | ||
| color: Colors.blue, | ||
| ), | ||
| ), | ||
| Padding(padding: EdgeInsets.only(bottom: 5)), | ||
| Text( | ||
| 'Wraps NSUserDefaults (on iOS) and SharedPreferences (on Android). Not recommended for storing critical data.', | ||
| style: TextStyle( | ||
| fontSize: 14, | ||
| ), | ||
| ), | ||
| Padding(padding: EdgeInsets.only(bottom: 10)), | ||
| ClipRRect( | ||
| borderRadius: BorderRadius.circular(10), | ||
| child: Container( | ||
| color: Colors.blue, | ||
| height: 175, | ||
| padding: EdgeInsets.all(10), | ||
| width: double.infinity, | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| crossAxisAlignment: CrossAxisAlignment.center, | ||
| children: <Widget>[ | ||
| Text( | ||
| 'Counter (int)', | ||
| style: TextStyle( | ||
| fontSize: 20, | ||
| color: Colors.white, | ||
| ), | ||
| ), | ||
| Padding(padding: EdgeInsets.only(bottom: 5)), | ||
| Text( | ||
| '$_counter', | ||
| style: TextStyle( | ||
| fontSize: 30, | ||
| color: Colors.white, | ||
| fontWeight: FontWeight.bold, | ||
| ), | ||
| ), | ||
| Padding(padding: EdgeInsets.only(bottom: 10)), | ||
| Row( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| crossAxisAlignment: CrossAxisAlignment.center, | ||
| children: <Widget>[ | ||
| RaisedButton( | ||
| child: Text('Increment'), | ||
| onPressed: _incrementCounter, | ||
| ), | ||
| Padding(padding: EdgeInsets.all(10)), | ||
| RaisedButton( | ||
| child: Text('Decrement'), | ||
| onPressed: _decreaseCounter, | ||
| ), | ||
| ], | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| ) | ||
| ], | ||
| ); | ||
| } | ||
|
|
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| _retrievePersistedCounter() async { | ||
| SharedPreferences preferences = await SharedPreferences.getInstance(); | ||
| int counter = (preferences.getInt(KEY_COUNTER) ?? 0) + 1; | ||
|
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| setState(() { | ||
| _counter = counter; | ||
| }); | ||
| } | ||
|
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| _incrementCounter() async { | ||
| SharedPreferences preferences = await SharedPreferences.getInstance(); | ||
| int counter = (preferences.getInt(KEY_COUNTER) ?? 0) + 1; | ||
| await preferences.setInt(KEY_COUNTER, counter); | ||
|
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| setState(() { | ||
| _counter = counter; | ||
| }); | ||
| } | ||
|
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| _decreaseCounter() async { | ||
| SharedPreferences preferences = await SharedPreferences.getInstance(); | ||
| int counter = (preferences.getInt(KEY_COUNTER) ?? 0) - 1; | ||
| await preferences.setInt(KEY_COUNTER, counter); | ||
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| setState(() { | ||
| _counter = counter; | ||
| }); | ||
| } | ||
| } |