Your Second Flutter App

Nov 30 2021 · Dart 2.13, Flutter 2.2.3, Visual Studio Code

Part 4: Filter Results

28. Use Shared Preferences

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Previous episode: 27. Challenge: Add a Filter Next episode: 29. Filter Courses

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Another key part of providing a solid user experience in your app is saving data that your user has entered so that it survives between app restarts.

https://pub.dev/packages/shared_preferences

flutter pub add shared_preferences

void _loadValue() {

}

  _loadValue() async {
    final prefs = await SharedPreferences.getInstance();
  }

import 'package:shared_preferences/shared_preferences.dart';

void _loadValue() async {
  final prefs = await SharedPreferences.getInstance();
  setState(() {
    _filterValue = prefs.getInt(Constants.filterKey) ?? 0;
  });
}

class _FilterPageState extends State<FilterPage> {
  int _filterValue = Constants.allFilter;

  @override
  void initState() {
    super.initState();

    _loadValue();
  }

  void _handleRadioValueChange(int? value) async {
    final prefs = await SharedPreferences.getInstance();
    setState(() {
      _filterValue = value ?? 0;
      prefs.setInt(Constants.filterKey, _filterValue);
    });
  }