How to save to local storage using Flutter

Question

In Android  if I have the information I want to persist across sessions I know I can use SharedPreferences or create a SQLite database or even write a file to the device and read it in later   Is there a way to save and restore data like this just using Flutter   Or would I need to write device-specific code for Android and iOS like in the services example

User · Answer

You can use shared preferences from flutter s official plugins   https   github com flutter plugins tree master packages shared preferences  It uses Shared Preferences for Android  NSUserDefaults for iOS

User · Answer

There are a few options    Read and write files  https   flutter io reading-writing-files  SQLite via a Flutter plugin  https   github com tekartik sqflite SQLCipher via a Flutter plugin  https   github com drydart flutter sqlcipher SharedPreferences via a Flutter plugin  https   github com flutter plugins tree master packages shared preferences

User · Answer

If you are in  a situation where you wanna save a small value that you wanna refer later  then you should store your data as key-value data using shared preferences    Storing key-value data on disk   but if you want to store large data you should go with SQLITE   How to get Started with SQLITE in Flutter   however you can always use firebase database which is available offline   how to add firebase to your flutter project  Firebase for Flutter Codelab from google    Since we are talking about local storage you can always read and write files to the disk   Reading and Writing Files   Other solutions     Simple Embedded Application Store database A Flutter plugin to store data in secure storage

User · Answer

If you need to store just simple values like API token or login data  not passwords    here is what I used   import  package shared preferences shared preferences dart    asyncFunc   async      Async func to handle Futures easier  or use Future then   SharedPreferences prefs   await SharedPreferences getInstance              Set prefs setString  apiToken   token       Get String token   prefs getString  apiToken        Remove prefs remove  apiToken      Don t forget to add shared preferences dependency in your pubspec yaml  preserve spacing format    dependencies     shared preferences  any

User · Answer

A late answer but I hope it will help anyone visiting here later too    I will provide categories to save and their respective best methods      Shared Preferences  Use this when storing simple values on storage e g Color theme  app language  last scroll position in reading apps    these are simple settings that you would want to persist when the app restarts    You could  however  use this to store large things Lists  Maps  Images  but that would require serialization and deserialization   To learn more on this deserialization and serialization go here  Files  This helps a lot when you have data that is defined more by you for example log files  image files and maybe you want to export csv files   I heard that this type of persistence can be washed by storage cleaners once disk runs out of space   Am not sure as i have never seen it     This also can store almost anything but with the help of serialization and deserialization   Saving to a database  This is enormously helpful in data which is a bit complex  And I think this doesn t get washed up by disc cleaners as it is stored in AppData for android     In this  your data is stored in an SQLite database  Its plugin is SQFLite   Kinds of data that you might wanna put in here are like everything that can be represented by a database

User · Answer

There are a few options  Moor  Persistence library for Dart  https   pub dev packages moor flutter  Read and Write file  https   flutter io reading-writing-files   Shared preferences plugin for flutter  https   pub dev packages shared preferences  SQlite for flutter  https   pub dev packages sqflite

User · Answer

You can use Localstorage 1- Add dependency to pubspec yaml  Change the version based on the last  dependencies          localstorage   3 0 0  2- Then run the following command flutter packages get  3-  import the localstorage   import  package localstorage localstorage dart    4- create an instance class MainApp extends StatelessWidget     final LocalStorage storage   new LocalStorage  localstorage app             Add item to lcoalstorage   void addItemsToLocalStorage       storage setItem  name    Abolfazl      storage setItem  family    Roshanzamir       final info   json encode   name    Darush    family    Roshanzami       storage setItem  info   info      Get an item from lcoalstorage  void getitemFromLocalStorage       final name   storage getItem  name       Abolfazl   final family   storage getItem  family       Roshanzamir      Map lt String  dynamic gt  info   json decode storage getItem  info       final info name info  name      final info family info  family       Delete an item from localstorage   void removeItemFromLocalStorage       storage deleteItem  name      storage deleteItem  family      storage deleteItem  info

User · Answer

I think If you are going to store large amount of data in local storage you can use sqflite library  It is very easy to setup and I have personally used for some test project and it works fine   https   github com tekartik sqflite  This a tutorial - https   proandroiddev com flutter-bookshelf-app-part-2-personal-notes-and-database-integration-a3b47a84c57  If you want to store data in cloud you can use firebase  It is solid service provide by google   https   firebase google com docs flutter setup

User · Answer

You can use SharedPreferences for small amount of data  But if you have large and complex data then you should use Sqlite Database for local storage in flutter applications

User · Answer

I was looking for the same  simple local storage but also with a reasonable level of security  The two solutions I ve found that make the most sense are flutter secure storage  as mentioned by Raouf  for the small stuff  and hive for larger datasets

[flutter] How to save to local storage using Flutter?

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