How to fix hive box already open error in flutter? - flutter

Question

I am trying to use hive to store data on a local machine using hive but each time when I compile the code it gives the error "The box "notebook" is already open and of type Box."
Can someone help me to resolve the issue as I am new to it? Thanks
I am just trying to add data to the database in this app without any change to the state of the app interface. I have tried to change the main method to void but no luck on this.
All the code is located in the main file
import 'package:flutter/material.dart';
import 'package:hive/hive.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'notes.dart';
import 'notesStoring.dart';
Future main() async{
WidgetsFlutterBinding.ensureInitialized();
await Hive.initFlutter();
Hive.registerAdapter(NotesAdapter());
await Hive.openBox<NotesAdapter>('noteBook');
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: const MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
const MyHomePage({Key? key, required this.title}) : super(key: key);
final String title;
#override
State<MyHomePage> createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
#override
void dispose() {
Hive.close();
// TODO: implement dispose
super.dispose();
}
#override
Future incrementCounter(String title) async {
final notes = Notes()
..title = title;
final box =Boxes.getNotesValues();
box.add(notes);
}
final titleForNotes=TextEditingController();
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body:
Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
const Text(
'You have pushed the button this many times:',
),
TextField(
controller: titleForNotes,
cursorColor: Colors.pink,
),
ValueListenableBuilder<Box<Notes>>(valueListenable: Boxes.getNotesValues().listenable(), builder: (context,box,_){
final noteBook =box.values.toList().cast<Notes>();
return buildContent(noteBook);
})
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: (){
incrementCounter(titleForNotes.text);
},
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
}
class Boxes {
static Box<Notes> getNotesValues()=>Hive.box<Notes>('noteBook');
}
Widget buildContent(List<Notes> noteBook){
return Column(
children: [
Expanded(child:
ListView.builder(
padding: EdgeInsets.all(8),
itemCount: noteBook.length,
itemBuilder: (BuildContext context, int index){
final notes= noteBook[index];
return buildTransaction(context, notes);
}
)
)
],
);
}
Widget buildTransaction(
BuildContext context,
Notes notes,
){
return Card(
color: Colors.green,
child: Text(notes.title),
);
}

Answer 1

1.You can open your notebook Box in the main method of your app:
Future<void> main() async {
...
final appDocumentDirectory = await
path_provider.getApplicationDocumentsDirectory();
Hive.init(appDocumentDirectory.path);
Hive.registerAdapter(UserAdapter());
// open the user box
await Hive.openBox('notebook');
_setUpLogging();
runApp(MultiProvider(providers: providers, child:
StartupApplication()));
}
2 Access the previously opened box like below:
class MyHomePage extends StatefulWidget {
const MyHomePage({Key key}) : super(key: key);
#override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
// user box
Box notebookBox;
#override
void initState() {
super.initState();
// get the previously opened user box
notebookBox = Hive.box('notebook');
}
#override
Widget build(BuildContext context) {
// check for your conditions
return (notebookBox.values.isNotEmpty && notebookBox.get(0).active == 1)
? HomeView()
: Intro();
}
}