Hive Local Database In Flutter

Hive Local Database In Flutter :

Screenshot :

Model Package :

contact.dart

import 'package:hive/hive.dart';

part 'contact.g.dart';

@HiveType()
class Contact {
  @HiveField(0)
  final String name;
  @HiveField(1)
  final int age;

  Contact(this.name, this.age);
}

contact.g.dart

part of 'contact.dart';

class ContactAdapter extends TypeAdapter<Contact> {
  @override
  Contact read(BinaryReader reader) {
    var numOfFields = reader.readByte();
    var fields = <int, dynamic>{
      for (var i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
    };
    return Contact(
      fields[0] as String,
      fields[1] as int,
    );
  }

  @override
  void write(BinaryWriter writer, Contact obj) {
    writer
      ..writeByte(2)
      ..writeByte(0)
      ..write(obj.name)
      ..writeByte(1)
      ..write(obj.age);
  }
}

contact_page.dart

import 'package:flutter/material.dart';
import 'package:hive/hive.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'models/contact.dart';
import 'new_contact_form.dart';

class ContactPage extends StatelessWidget {
  const ContactPage({
    Key key,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text('Hive Tutorial'),
        ),
        body: Column(children: <Widget>[
          Expanded(child: _buildListView()),
          NewContactForm(),
        ]));
  }

  Widget _buildListView() {
    return WatchBoxBuilder(
        box: Hive.box('contacts'),
        builder: (context, contactsBox) {
          return ListView.builder(
              itemCount: contactsBox.length,
              itemBuilder: (context, index) {
                final contact = contactsBox.getAt(index) as Contact;

                return ListTile(
                    title: Text(contact.name),
                    subtitle: Text(contact.age.toString()),
                    trailing:
                        Row(mainAxisSize: MainAxisSize.min, children: <Widget>[
                      IconButton(
                          icon: Icon(Icons.refresh),
                          onPressed: () {
                            contactsBox.putAt(
                              index,
                              Contact('${contact.name}*', contact.age + 1),
                            );
                          }),
                      IconButton(
                          icon: Icon(Icons.delete),
                          onPressed: () {
                            contactsBox.deleteAt(index);
                          })
                    ]));
              });
        });
  }
}

new_contact_form.dart

import 'package:flutter/material.dart';
import 'package:hive/hive.dart';
import 'models/contact.dart';

class NewContactForm extends StatefulWidget {
  @override
  _NewContactFormState createState() => _NewContactFormState();
}

class _NewContactFormState extends State<NewContactForm> {
  final _formKey = GlobalKey<FormState>();

  String _name;
  String _age;

  void addContact(Contact contact) {
    final contactsBox = Hive.box('contacts');
    contactsBox.add(contact);
  }

  @override
  Widget build(BuildContext context) {
    return Form(
        key: _formKey,
        child: Column(children: <Widget>[
          Row(children: <Widget>[
            Expanded(
                child: TextFormField(
              decoration: InputDecoration(labelText: 'Name'),
              onSaved: (value) => _name = value,
            )),
            SizedBox(width: 10),
            Expanded(
                child: TextFormField(
              decoration: InputDecoration(labelText: 'Age'),
              keyboardType: TextInputType.number,
              onSaved: (value) => _age = value,
            ))
          ]),
          RaisedButton(
              child: Text('Add New Contact'),
              onPressed: () {
                _formKey.currentState.save();
                final newContact = Contact(_name, int.parse(_age));
                addContact(newContact);
              })
        ]));
  }
}

pubspec.yaml

name: hive_db_local
description: A new Flutter application.
version: 1.0.0+1

environment:
  sdk: ">=2.1.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter
  hive:
  hive_flutter:
  path_provider:
  cupertino_icons: ^0.1.2

dev_dependencies:
  flutter_test:
    sdk: flutter
  hive_generator:
  build_runner:

flutter:
  uses-material-design: true

main.dart

import 'package:flutter/material.dart';
import 'package:hive/hive.dart';
import 'package:path_provider/path_provider.dart' as path_provider;
import 'contact_page.dart';
import 'models/contact.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  final appDocumentDirectory =
      await path_provider.getApplicationDocumentsDirectory();
  Hive.init(appDocumentDirectory.path);
  Hive.registerAdapter(ContactAdapter(), 0);
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Hive Tutorial',
        home: FutureBuilder(
            future: Hive.openBox('contacts',
                compactionStrategy: (int total, int deleted) {
              return deleted > 20;
            }),
            builder: (BuildContext context, AsyncSnapshot snapshot) {
              if (snapshot.connectionState == ConnectionState.done) {
                if (snapshot.hasError)
                  return Text(snapshot.error.toString());
                else
                  return ContactPage();
              } else
                return Scaffold();
            }));
  }

  @override
  void dispose() {
    Hive.box('contacts').compact();
    Hive.close();
    super.dispose();
  }
}

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