TesteurManiak/shared_preferences_gen

Typesafe code generation for Flutter shared_preferences.

shared_preferences_gen

A code generator that provides strongly-typed accessors for Flutter shared_preferences entries.

Features

• Check for duplicate keys
• Type-safe accessors for shared preferences
• Support for:
  • DateTime
  • enum
  • Serializable objects with fromJson constructor and toJson method

How to use

Install

Make sure to add these packages to the project dependencies:

flutter pub add --dev build_runner
flutter pub add --dev shared_preferences_gen
flutter pub add shared_preferences_annotation

Compatibility with json_serializable

If you are using json_serializable, you need to add the following configuration to your build.yaml file:

global_options:
  json_serializable:
    runs_before:
      - shared_preferences_gen

This will ensure that the generated toJson and fromJson methods are available when analyzing the code.

Add imports and part directive

Make sure to specify the correct file name in a part directive. In the example below, replace "name" with the file name.

import 'package:shared_preferences_annotation/shared_preferences_annotation.dart';

part 'name.g.dart';

Run the code generator

To run the code generator, run the following commands:

dart run build_runner build --delete-conflicting-outputs

Create a shared preferences entry

To create a shared preferences entry, first create an annotation @SharedPrefData in the file where you want to store your instance of SharedPreferences. Then add an entry with its corresponding type, key and default value (optional).

SharedPrefEntry

A SharedPrefEntry can be used with any of those types:

• bool
• double
• int
• String
• List<String>
• DateTime
• Any enum
• Any serializable object with a toJson method and fromJson factory constructor

@SharedPrefData(entries: [
  SharedPrefEntry<String>(key: 'myKey'),
])
void main() { /* ... */ }

Read an entry

You can access the generated entries directly from your instance of SharedPreferences.

final prefs = await SharedPreferences.getInstance();
String myKey = prefs.myKey.value;
bool darkMode = prefs.darkMode.value;

Write an entry

final prefs = await SharedPreferences.getInstance();
await prefs.myKey.setValue('newValue');

Remove an entry

final prefs = await SharedPreferences.getInstance();
await prefs.myKey.remove();

Roadmap

• Support for custom objects (no ETA)