[Question]

[GroovinChip]

When creating a new box, like so: var box = await Hive.box('SettingsBox'); is box null until a value has been put into the box?

[simc]

No it should be an instance of Box. There should also be a file settingsbox.hive created.

[GroovinChip]

Odd. I'm messing around with using Hive on Windows, and I'm using Provider to send a box down the widget tree. I create it in the root widget like so:

class MyApp extends StatefulWidget {
  // This widget is the root of your application.
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  var box;

  @override
  void initState() {
    makeBox();
    super.initState();
  }

  void makeBox() async {
    box = await Hive.box('SettingsBox');
  }

  @override
  Widget build(BuildContext context) {
    return Provider<Box>(
      builder: (context) => box,
      child: MaterialApp(
        title: 'Flutter Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: MyHomePage(),
      ),
    );
  }
}

When I access it in a different widget, like so: var box = Provider.of<Box>(context);, Flutter tells me that the runtimeType is null.

[simc]

If I'm correct, the problem here is that makeBox() is not finished yet when build() tries to access the box. You don't await makeBox(). The problem is that in order to await makeBox(), initState() would need to be async which is not allowed.

I'm working on helpers for Flutter but until then you could use something like that:

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: FutureBuilder<Box>(
        future: Hive.box('SettingsBox'),
        builder: (BuildContext context, AsyncSnapshot<Box> snapshot) {
          if (snapshot.connectionState == ConnectionState.done) {
            return SomePage();
          } else {
            return Center(
              child: Text('Please wait'),
            );
          }
        },
      ),
    );
  }
}

class SomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    var box = Hive['SettingsBox'];
    // Do whatever you like with the box
    return Center(
      child: Text('Your App content'),
    );
  }
}

Btw: you don't have to pass boxes. If you already opened it, you can get the box instance using Hive['yourBoxName']

[GroovinChip]

Okay, thank you very much!

[simc]

I created a basic example if you are interested...

[GroovinChip]

Thanks!