CODEWITHSUNDEEP
flutterlocal-storage
Alok Banjare
Alok Banjare

Reputation: 170

LocalStorage not persisting data after we close the flutter app

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

Upvotes: 5

Views: 5545

Answers (4)

Jorge Ferrari Ce
Jorge Ferrari Ce

Reputation: 1

You have to wait for the storage to be ready, you can do that by using the ready getter from your LocalStorage instance.

// Note tha this has to be inside an async function
LocalStorage storage = LocalStorage('mykey');
await storage.ready;
// Do your storage manipulation here

If you don't want to await for the storage to be ready everytime you can add it to your App State in main.dart while initializing.

Turn your void main() into void main() async and put a await storage.ready there.

Upvotes: 0

beton
beton

Reputation: 41

If you created an abstraction for it you need initialize it in main function. such as

await AppGeneralCacheInitilization.instance.initializeCacheService();

by this way we are sure that the storage is available.

Upvotes: 0

campovski
campovski

Reputation: 3163

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
    },
  );
}

Upvotes: 6

Amir
Amir

Reputation: 2355

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);
     });

};

Upvotes: 1

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