Cache two Lists in flutter

Question

I want to cache two lists that got from Firebase to use to later when the user is offline

This is the full code for my list display screen -

import          


        

Answer 1

I didn't get complete requirement by your question description but you can use shared_preferences library to store the data list as following
Add following line pubspec.yaml

dependencies:
  flutter:
    sdk: flutter
  shared_preferences:

You can use this example and add more utility methods as per you requirement.

import 'dart:convert';

import 'package:flutter/material.dart';
import 'package:shared_preferences/shared_preferences.dart';

void main() async {
  AppConfig.init(() {
    runApp(MyApp());
  });
}

class CustomModel {
  int id;
  String name;

  CustomModel({this.id, this.name});

  factory CustomModel.fromJson(Map json) {
    return CustomModel(id: json["id"], name: json["name"]);
  }

  Map toJson() => {"id": id, "name": name};

  @override
  String toString() {
    return "id: $id, name: $name";
  }
}

class AppConfig {
  static Future init(VoidCallback callback) async {
    WidgetsFlutterBinding.ensureInitialized();
    await SharedPreferenceUtils.init();
    callback();
  }
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class SharedPreferenceUtils {
  static SharedPreferences prefs;

  static init() async {
    prefs = await SharedPreferences.getInstance();
    // storing lists
    await putStringList("m_list", ["abc", "def"]);
    await putObjectList("data",
        [CustomModel(id: 1, name: "Bob"), CustomModel(id: 2, name: "Alice")]);
  }

  static Future putStringList(String key, List list) async {
    return prefs.setStringList(key, list);
  }

  static List getStringList(String key) {
    return prefs.getStringList(key);
  }

  static Future putObjectList(String key, List