Я изучаю базу данных улья во флаттере: - когда я использую пакеты флаттера, паб запускает команду build_runner, генерирует в ней файл data.g.dart, в ней есть ошибка, исправьте ее.
полная ошибка: - {"resource": "/E:/Mywork/AndroidApps/hive_todo/lib/data.g.dart", "owner": "dart", "code": "non_abstract_class_inherits_abstract_member", "severity": 8, «message»: «Отсутствует конкретная реализация getter TypeAdapter.typeId». \ NПопробуйте реализовать отсутствующий метод или сделать класс абстрактным. »,« Source »:« dart »,« startLineNumber »: 9,« startColumn » : 7, "endLineNumber": 9, "endColumn": 18, "теги": []}
**the data.g.dart code:-**
// GENERATED CODE - DO NOT MODIFY BY HAND
part of 'data.dart';
// **************************************************************************
// TypeAdapterGenerator
// **************************************************************************
class dataAdapter extends TypeAdapter<data> {
@override
data read(BinaryReader reader) {
var numOfFields = reader.readByte();
var fields = <int, dynamic>{
for (var i = 0; i < numOfFields; i++) reader.readByte(): reader.read(),
};
return data(
todo: fields[0] as String,
val: fields[1] as int,
);
}
@override
void write(BinaryWriter writer, data obj) {
writer
..writeByte(2)
..writeByte(0)
..write(obj.todo)
..writeByte(1)
..write(obj.val);
}
}
код data.dart
import 'package:hive/hive.dart';
part 'data.g.dart';
@HiveType()
class data {
@HiveField(0)
final String todo;
@HiveField(1)
final int val;
data({this.todo,this.val});
}
код основного метода
import 'package:flutter/material.dart';
import 'package:hive/hive.dart';
import 'package:path_provider/path_provider.dart' as path_provider;
import 'data.dart';
import 'todo_page.dart';
void main() async {
WidgetsFlutterBinding.ensureInitialized();
final appDocumentDir = await path_provider.getApplicationDocumentsDirectory();
Hive.init(appDocumentDir.path);
Hive.registerAdapter(dataAdapter());
runApp(MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Hive Todo',
home: FutureBuilder(
future: Hive.openBox('data'),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.done) {
if (snapshot.hasError)
return Text(snapshot.error.toString());
else
return Todo_Page();
}
// Although opening a Box takes a very short time,
// we still need to return something before the Future completes.
else
return Scaffold(backgroundColor: Colors.red);
},
),
);
}
@override
void dispose() {
Hive.close();
super.dispose();
}
}
Если я сделаю быстрое исправление, то ошибка исчезнет, но когда я зарегистрирую адаптер в основном методе
Hive.registerAdapter(dataAdapter(), 0);
выдает ошибку только из-за typeId, когда я его удаляю,
Hive.registerAdapter(dataAdapter());
тогда не выдает ошибку
но я мне нужен typeId.
мой pubspe c .yaml
name: hive_todo
description: A new Flutter project.
# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1
environment:
sdk: ">=2.5.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
hive: ^1.2.0
hive_flutter: ^0.2.1
# For OS-specific directory paths
path_provider: ^1.3.1
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
dev_dependencies:
flutter_test:
sdk: flutter
hive_generator: ^0.5.1
build_runner:
# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec
# The following section is specific to Flutter.
flutter:
# The following line ensures that the Material Icons font is
# included with your application, so that you can use the icons in
# the material Icons class.
uses-material-design: true
# To add assets to your application, add an assets section, like this:
# assets:
# - images/a_dot_burr.jpeg
# - images/a_dot_ham.jpeg
# An image asset can refer to one or more resolution-specific "variants", see
# https://flutter.dev/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.dev/assets-and-images/#from-packages
# To add custom fonts to your application, add a fonts section here,
# in this "flutter" section. Each entry in this list should have a
# "family" key with the font family name, and a "fonts" key with a
# list giving the asset and other descriptors for the font. For
# example:
# fonts:
# - family: Schyler
# fonts:
# - asset: fonts/Schyler-Regular.ttf
# - asset: fonts/Schyler-Italic.ttf
# style: italic
# - family: Trajan Pro
# fonts:
# - asset: fonts/TrajanPro.ttf
# - asset: fonts/TrajanPro_Bold.ttf
# weight: 700
#
# For details regarding fonts from package dependencies,
# see https://flutter.dev/custom-fonts/#from-packages
пожалуйста, скажите мне, как решить эту проблему, и объясните мне, потому что я новичок.
спасибо, Umar_baloch.