LocalStorage not persisting data after we close the flutter app

user_4342395 0
Viewed 1999

I am new to Flutter and developing app which needs to store some amount of data in LocalStorage, I am successfully storing and retrieving data to and from LocalStorage but when I close the App and reopens it, it flushes the entire data, and when we try to access the same data it gives Null. I am attaching my sample code here how I am doing it. Its working fine only issue is it does not persist data after restarting an APP. 

void saveData() async{

    final LocalStorage storage = new LocalStorage('brick-game');

    await storage.setItem('data', _data);  

}


@override
  Widget build(BuildContext context){

        final LocalStorage storage = new LocalStorage('brick-game');

        final data  = storage.getItem('data');

};

Please let me know what I am doing wrong or anything I am missing. Your help will be appreciated. Thanks

flutter local-storage
2 Answers

For some reason you have to await the local storage to be ready (This should be done automatically though). So, before calling getItem() you need await storage.ready;, like so:

Future<DataType> _getData() async {
  final LocalStorage storage = new LocalStorage('brick-game');
  await storage.ready;
  return await storage.getItem('data');
}

and then in your build method you can use a FutureBuilder<T>() to build your UI.

@override
Widget build(BuildContext context) {
  return FutureBuilder<DataType>(
    future: _getData,
    builder: (BuildContext context) {
      if (snapshot.hasData) // we read data from storage
      else if (snapshot.hasError) // an error occured
      else // we are still loading
    },
  );
}
user_85363770

local storage has a ready method, that means it takes a while to can access storage

your save method is async and you set items with await keyword, but when you launch the app again you get items without await keyword

try to make a method for getting items

getItems() async {
   final LocalStorage storage = new LocalStorage('brick-game');

   final data  = await storage.getItem('data');
   print(data);
}



@override
  Widget build(BuildContext context){

     getItems().then((_){
        print(data);
     });

};
user_31272820
Related