how to persist a list of custom objects in flutter with shared preferences?

Question

i want to persist a list that has custom objects and i even wrote method for serializing and de-serializing it but i don't know how to use it with SharedPreferences and FutureBuilder

here is the custom object:

 class Fact {
  String factText;
  Color factColor;

  Fact(this.factText, this.factColor);

  Map<String, dynamic> toJson() =>
      {'factText': factText, 'factColor': factColor};

  Fact.fromJson(Map<String, dynamic> json)
      : factText = json['factText'],
        factColor = json['factColor'];
}

Same as https://stackoverflow.com/questions/60192099/create-json-arrays-and-list-with-sharedpreferences/60237867#60237867 — Kahou
– Kahou, Commented Feb 23, 2020 at 14:32
shared preferences are implemented as xml files (at least on android) - so i dont think its the best for storing large amount of data — pskink
– pskink, Commented Feb 23, 2020 at 16:19

Peter Haddad · Accepted Answer · 2020-02-23 15:20:06Z

1

If you want to store a list inside shared_preference, then you can use the method setStringList():

  /// Saves a list of strings [value] to persistent storage in the background.
  ///
  /// If [value] is null, this is equivalent to calling [remove()] on the [key].
  Future<bool> setStringList(String key, List<String> value) =>
      _setValue('StringList', key, value);

answered Feb 23, 2020 at 15:20

Peter Haddad

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2 Comments

hewa jalal Over a year ago

So I don't need to serialize my object?

Peter Haddad Over a year ago

you still need to use fromjson

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