shared_value

A simple shared_preferences wrapper.

Usage

Initialize

The SharedValue class has a static references to a SharedPreferences instance.

Initialize using the init function:

await SharedValue.init();

or use an existing instance of SharedPreferences:

final prefs = await SharedPreferences.getInstance();
await SharedValue.setPrefs(prefs);

Create Values

There are two main classes. SharedValue can be used to stare all data types SharedPreferences itself supports and their nullable counterparts.

To store other data types, the SerdeSharedValue class can be used.

final sharedValue = SharedValue<int>(key: "unique value key", initialValue: 349);


final serdeSharedValue = SerdeSharedValue<DateTime>(
    key: "another unique key",
    initialValue: DateTime.now(),
    serializer: (
      serialize: (val) => val.toString(),
      deserialize: DateTime.parse
    ));

The "initialValue‘ will be set only if the key is not present in the SharedPreferences instance.

Access and update values

Values can be accessed through the get and set methods.

sharedValue.get(); // = 349

sharedValue.set(0);

sharedValue.get(); // = 0

If the value was not set before null will be returned.