В данном цикле статей я хотел бы показать, как может происходить создание приложений с использованием Flutter. Я использую данную технологию в работе, а также своих собственных проектах на постоянной основе. У меня есть несколько Open Source решений (популярных и не очень), которые будут применены и в данном приложении (не ради галочки, а в качестве решения возникающих проблем). В процессе работы над этим приложением я затрону почти все аспекты разработки с Flutter, за исключением явного взаимодействия с нативной частью (когда нативный код придется писать самому), но если у вас будет желание увидеть и это -- то прошу в комментарии. Ну и самое главное -- верхнеуровневая идея приложения у меня в голове уже есть, и код на эту статью и следующую уже написан, но если у вас будут возникать идеи, которые можно было бы реализовать в данном приложении в рамках закона коридора первоначальной идеи -- прошу высказывать их в комментариях.
Идея приложения
Изначально я не знал, о чем будет это приложение, когда у меня появилась идея написать эти статьи. Все что я хотел -- показать весь процесс от начала и до конца, а также, чего греха таить? -- показать использование своих Open Source решений на таком, полу-реальном проекте, чтобы иметь возможность ссылаться на него, а не только на примеры в этих пакетах. Собственно, идея пришла совсем недавно -- приложение будет отображать котировки в виде списка, а также график каждой из котировок, если перейти в конкретный тикер.
К сожалению, в ходе более чем полуторамесячного, прокрастинационного и крайне непростого срока я решил отказаться от первоначальной идеи реализовывать именно биржевые котировки, так как проанализировав (и даже уже использовав в приложении) множество ресурсов пришел к выводу, что ни один из них не предоставляет все необходимую информацию в виде, пригодном для данного проекта без необходимости его переусложнения и с достаточными ограничениями в бесплатной версии. Поэтому выбор пал на криптовалютные API, благо, с ними все намного лучше.
Для интерфейса я нашел такой макет:
В качестве основы я возьму из этого макета цвета, компоновку экрана и стиль графиков. Экранов, как я пока думаю, будет два.
Первый -- список позиций, которые есть на бирже, а также поиск по ним. Основой будет выступать этот фрагмент дизайна:
Второй экран -- переход на страницу самой позиции. Он будет самым интересным -- я планирую реализовать график котировок позиции, отображение текущей цены, и небольшой игровой элемент -- две кнопки Up / Down (как в бинарных опционах, только без реальных денег, обмана и для пользы и интереса). Получится такое мини-игровое приложение, где можно будет не только смотреть котировки, но и "играть" -- введу счетчик побед и что-нибудь с этим связанное (детально этот аспект я пока не прорабатывал -- пишите идеи).
Реализация
Ну вот, идею описал, пора переходить к делу. Исходя из всего вышеописанного я могу описать структуру проекта примерно следующим образом:
/root
/service
/routing
/di
/...
/domain
/main
/dto
/model
/logic
/ui
/position
/dto
/model
/logic
/ui
Начнем мы с реализации сервисного слоя:
DI
Тут на помощь разработчику может прийти большое количество различных пакетов, решающих эту задачу -- с кодогенерацией и без, с большим количеством бойлерплейта и нет, но мне кажется, что это тривиальная задача, и решить её самостоятельно очень просто. Так и сделаем! Вся логика умещается в двух файлах -- сам контейнер, и логика добавления зависимостей в него:
import 'package:flutter/cupertino.dart';
class Di {
static final Map<String, dynamic> _dependencies = <String, dynamic>{};
static final Map<String, ValueGetter<dynamic>> _builders = <String, ValueGetter<dynamic>>{};
static String _generateDiCode<T>([String name = '']) {
return '$T$name';
}
static void reg<T>(ValueGetter<T> builder, {String name = '', bool asBuilder = false}) {
final String code = _generateDiCode<T>(name);
if (asBuilder) {
_builders[code] = builder;
} else {
_dependencies[code] = builder();
}
}
static T get<T>({String name = ''}) {
final String code = _generateDiCode<T>(name);
late T value;
if (!_dependencies.containsKey(code) && !_builders.containsKey(code)) {
throw Exception('Dependency for type $T with code $code not registered');
} else if (_dependencies.containsKey(code)) {
value = _dependencies[code];
} else {
value = _builders[code]!();
}
return value;
}
}
Как и в других решениях мы можем внедрять идентичные сущности, добавляя к ним свои префиксы, и создавать синглтоны, так и постоянно новые инстансы классов.
Второй файл: добавление зависимостей в сам контейнер, чтобы ему было что создавать и возвращать:
import 'package:flutter/cupertino.dart';
import 'package:high_low/service/di/di.dart';
import 'package:high_low/service/routing/default_router_information_parser.dart';
import 'package:high_low/service/routing/page_builder.dart';
import 'package:high_low/service/routing/root_router_delegate.dart';
void initDependencies() {
Di.reg<BackButtonDispatcher>(() => RootBackButtonDispatcher());
Di.reg<RouteInformationParser<Object>>(() => DefaultRouterInformationParser());
Di.reg<RouterDelegate<Object>>(() => RootRouterDelegate());
Di.reg(() => PageBuilder());
}
В будущем, чтобы добавить новые зависимости будет достаточно регистрировать в этой функции их фабрики и все будет работать как надо.
Routing
Второй аспект, один из самых сложных в любом приложении. Я буду использовать подход Navigator 2.0.
На самом деле все не сильно сложно, и согласно этой схеме:
нам нужно реализовать следующие классы:
- RouteInformationProvider
- RouteInformationParser
- RouterDelegate
- Router
Их внедрение в контейнер DI я уже проспойлерил, давайте посмотрим, что там внутри.
RouteInformationProvider
Представляет собой провайдер дополнительной информации, которая будет добавлена к урлу, по которому осуществляется переход, и передана дальше в RouteInformationParser. В целом, это не обязательный фрагмент логики навигации в нашем случае, поэтому пока его реализация остается под вопросом.
RouteInformationParser
Должен парсить урл, вытаскивать из него нужные параметры, и передавать их дальше -- в RouterDelegate. Вот код нашей реализации (на текущий момент):
import 'package:flutter/cupertino.dart';
import 'package:high_low/service/routing/route_configuration.dart';
import 'package:high_low/service/routing/routes.dart';
class DefaultRouterInformationParser extends RouteInformationParser<RouteConfiguration> {
@override
Future<RouteConfiguration> parseRouteInformation(RouteInformation routeInformation) {
return Future.sync(() => Routes.getRouteConfiguration(routeInformation.location ?? Routes.root()));
}
}
Также нам интересен класс RouteConfiguration, вот он:
import 'package:flutter/cupertino.dart';
import 'package:high_low/service/logs/logs.dart';
import 'package:high_low/service/routing/routes.dart';
import 'package:high_low/service/types/types.dart';
import 'package:json_annotation/json_annotation.dart';
part 'route_configuration.g.dart';
@immutable
@JsonSerializable()
class RouteConfiguration {
const RouteConfiguration({
required this.initialPath,
required this.routeName,
required this.routeParams,
});
const RouteConfiguration.empty({
required this.initialPath,
required this.routeName,
}) : routeParams = const RouteParams(params: <String, String>{}, query: <String, String>{});
factory RouteConfiguration.unknown() => RouteConfiguration.empty(initialPath: Routes.unknown(), routeName: Routes.unknown());
factory RouteConfiguration.fromJson(Json json) => _$RouteConfigurationFromJson(json);
final String initialPath;
final String routeName;
final RouteParams routeParams;
Json toJson() => _$RouteConfigurationToJson(this);
@override
String toString() => prettyJson(toJson());
}
@immutable
@JsonSerializable()
class RouteParams {
const RouteParams({
required this.params,
required this.query,
});
factory RouteParams.fromJson(Json json) => _$RouteParamsFromJson(json);
final Json params;
final Json query;
Json toJson() => _$RouteParamsToJson(this);
}
Тут вы можете заметить появление еще одного пакета -- json_annotation, он нужен для генерации конструкторов и методов классов для сериализации в JSON и десериализации из JSON. Его необходимо устанавливать совместно еще с парочкой:
dependencies:
json_annotation: ^4.3.0
#...
dev_dependencies:
build_runner: ^2.1.4
json_serializable: ^6.0.1
#...
Если же говорить о функциональности самого класса -- в него преобразуется любой входящий урл, и из него мы будем брать интересующие нас параметры для дальнейшей логики RouterDelegate. Например для такого входящего deep link flutter run --route="/item/AAPL?interval=day" мы получим следующий RouteConfiguration:
{
"initialPath": "/item/AAPL?interval=day",
"routeName": "/item/:itemCode",
"routeParams": {
"params": {
"itemCode": "AAPL"
},
"query": {
"interval": "day"
}
}
}
Происходит это преобразование урла в конфигурацию в методе Routes.getRouteConfiguration(...):
import 'package:high_low/service/routing/route_configuration.dart';
typedef RouteParamName = String;
typedef RouteParamValue = String;
const String itemCode = 'itemCode';
abstract class Routes {
static String root() => '/';
static String item(String itemCode) => '/item/$itemCode';
static String unknown() => '/404';
static List<String> names = [
Routes.root(),
Routes.item(':$itemCode'),
Routes.unknown(),
];
static RouteConfiguration getRouteConfiguration(String route) {
if (route == Routes.root()) {
return RouteConfiguration.empty(initialPath: route, routeName: Routes.root());
}
final Uri routeUri = Uri.parse(route);
final List<String> routeSubPaths = routeUri.pathSegments;
if (routeSubPaths.isEmpty) {
return RouteConfiguration.empty(initialPath: route, routeName: Routes.unknown());
}
for (final String routeName in names) {
final List<String> routeNameSubPaths = routeName.split('/').where((String segment) => segment.isNotEmpty).toList();
if (routeNameSubPaths.length != routeSubPaths.length) {
continue;
}
bool isTargetName = true;
final Map<RouteParamName, RouteParamValue> params = {};
for (int i = 0; i < routeSubPaths.length; i++) {
final String routeSubPath = routeSubPaths[i];
final String routeNameSubPath = routeNameSubPaths[i];
final bool isDynamicSubPath = routeNameSubPath.contains(':');
if (routeSubPath != routeNameSubPath && !isDynamicSubPath) {
isTargetName = false;
break;
} else if (isDynamicSubPath) {
params[routeNameSubPath.replaceFirst(':', '')] = routeSubPath;
}
}
if (isTargetName) {
return RouteConfiguration(initialPath: route, routeName: routeName, routeParams: RouteParams(params: params, query: routeUri.queryParameters));
}
}
return RouteConfiguration.empty(initialPath: route, routeName: Routes.unknown());
}
}
Эту логику можно расширить. Например -- сейчас этот код не обработает query-параметры массивы, вроде /item/AAPL?interval=month,day, а на другом способе указания параметров массивов: /item/AAPL?interval=month&interval=day -- Flutter вообще не запускается со следующей ошибкой:
ProcessException: Process exited abnormally:
Starting: Intent { act=android.intent.action.RUN flg=0x20000000 (has extras) }
/system/bin/sh: --ez: inaccessible or not found
Error: Activity not started, unable to resolve Intent { act=android.intent.action.RUN flg=0x30000000 (has extras) }
Command: C:\\Users\\Mikle\\AppData\\Local\\Android\\sdk\\platform-tools\\adb.exe -s emulator-5554 shell am start -a android.intent.action.RUN -f 0x20000000 --ez enable-background-compilation true --ez enable-dart-profiling true --es route /item/AAPL?interval=month&interval=day --ez enable-checked-mode true --ez verify-entry-points true --ez start-paused true com.alphamikle.high_low/com.alphamikle.high_low.MainActivity
В общем -- брать за основу этот код можно смело, но под специфичные урлы своего проекта еще нужно будет дорабатывать.
RouterDelegate
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:high_low/domain/main/ui/main_view.dart';
import 'package:high_low/service/di/di.dart';
import 'package:high_low/service/logs/logs.dart';
import 'package:high_low/service/routing/page_builder.dart';
import 'package:high_low/service/routing/route_configuration.dart';
import 'package:high_low/service/routing/routes.dart';
class RootRouterDelegate extends RouterDelegate<RouteConfiguration> with ChangeNotifier, PopNavigatorRouterDelegateMixin<RouteConfiguration> {
RootRouterDelegate() : navigatorKey = GlobalKey();
@override
final GlobalKey<NavigatorState> navigatorKey;
PageBuilder get pageBuilder => Di.get();
final List<Page> pages = [];
@override
RouteConfiguration currentConfiguration = RouteConfiguration.empty(initialPath: Routes.root(), routeName: Routes.root());
bool onPopRoute(Route<dynamic> route, dynamic data) {
if (route.didPop(data) == false) {
return false;
}
pages.removeLast();
notifyListeners();
return true;
}
Future<void> mapRouteConfigurationToRouterState(RouteConfiguration configuration) async {
final String name = configuration.routeName;
pages.clear();
if (name == Routes.unknown()) {
// openUnknownView();
Logs.warn('TODO: Open Unknown View');
}
}
@override
Future<void> setNewRoutePath(RouteConfiguration configuration) async {
Logs.debug('setNewRoutePath: $configuration');
currentConfiguration = configuration;
await mapRouteConfigurationToRouterState(configuration);
notifyListeners();
}
@override
Widget build(BuildContext context) {
return Navigator(
key: navigatorKey,
pages: [
pageBuilder.buildUnAnimatedPage(const MainView(), name: Routes.root()),
...pages,
],
onPopPage: onPopRoute,
);
}
}
Это только основа делегата, но из интересного тут -- метод mapRouteConfigurationToRouterState, который вызывается из метода setNewRoutePath -- который, в свою очередь, и обрабатывает конфигурации роутинга, поступающие сюда из RouteInformationParser. В будущем мы будем писать здесь методы навигации.
Logging
Последний пункт -- логирование. Тут все совсем просто -- я сделал небольшую обертку поверх библиотеки logging, которая, как по мне -- дает одни из лучших возможностей по логированию. Теперь мы можем передавать любые аргументы в методы логирования.
import 'dart:convert';
import 'package:logger/logger.dart' as logger;
String _getJoinedArguments(dynamic p1, [dynamic p2, dynamic p3]) {
String result = p1.toString();
result += p2 == null ? '' : ' ${p2.toString()}';
result += p3 == null ? '' : ' ${p3.toString()}';
return result;
}
String prettyJson(Map<String, dynamic> json) {
const JsonEncoder jsonEncoder = JsonEncoder.withIndent(' ');
return jsonEncoder.convert(json);
}
final _logger = logger.Logger(
printer: logger.PrefixPrinter(
logger.PrettyPrinter(
colors: true,
printEmojis: false,
methodCount: 0,
errorMethodCount: 3,
stackTraceBeginIndex: 0,
),
),
);
abstract class Logs {
static void debug(dynamic p1, [dynamic p2, dynamic p3]) {
_logger.d(_getJoinedArguments(p1, p2, p3));
}
static void info(dynamic p1, [dynamic p2, dynamic p3]) {
_logger.i(_getJoinedArguments(p1, p2, p3));
}
static void warn(dynamic p1, [dynamic p2, dynamic p3]) {
_logger.w(_getJoinedArguments(p1, p2, p3));
}
static void error(dynamic p1, [dynamic p2, dynamic p3]) {
_logger.e(_getJoinedArguments(p1, p2, p3));
}
static void fatal(dynamic p1, [dynamic p2, dynamic p3]) {
_logger.wtf(_getJoinedArguments(p1, p2, p3));
}
static void trace(dynamic p1, [dynamic p2, dynamic p3]) {
_logger.v(_getJoinedArguments(p1, p2, p3));
}
static void pad(dynamic p1, [dynamic p2, dynamic p3]) {
print(_getJoinedArguments(p1, p2, p3));
}
}
Другое
Еще вы могли заметить тип Json -- это алиас, располагаемый в файле types.dart. В этот файл мы будем писать и другие алиасы, которые будут использоваться в приложении:
typedef Json = Map<String, dynamic>;
Для использования алиасов не только для функций необходимо повысить минимальную версию Dart в pubspec.yaml до >= 2.14.0.
Заключение
На текущий момент реализована самая базовая логика, которая нужна для дальнейшей разработки бизнес-функционала. Исходный код текущей части можно посмотреть здесь.
Продолжение здесь.
Больше материалов смотрите в моем блоге на Хабре.
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<div class="post-info__author">Михаил</div>
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<div class="post-info__time">10.01.22 в 15:41</div>
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<h1 class="blog__h1">Разработка приложения на Flutter с нуля до релиза: Идея + Базовая инфраструктура</h1>
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Теги: разработка мобильных приложений, flutter, dart
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<p>В данном цикле статей я хотел бы показать, как может происходить создание приложений с использованием Flutter. Я использую данную технологию в работе, а также своих собственных проектах на постоянной основе. У меня есть несколько Open Source решений (популярных и не очень), которые будут применены и в данном приложении (не ради галочки, а в качестве решения возникающих проблем). В процессе работы над этим приложением я затрону почти все аспекты разработки с Flutter, за исключением явного взаимодействия с нативной частью (когда нативный код придется писать самому), но если у вас будет желание увидеть и это -- то прошу в комментарии. Ну и самое главное -- верхнеуровневая идея приложения у меня в голове уже есть, и код на эту статью и следующую уже написан, но если у вас будут возникать идеи, которые можно было бы реализовать в данном приложении в рамках закона коридора первоначальной идеи -- прошу высказывать их в комментариях. <cut></cut></p>
<h2>Идея приложения</h2>
<p>Изначально я не знал, о чем будет это приложение, когда у меня появилась идея написать эти статьи. Все что я хотел -- показать весь процесс от начала и до конца, а также, чего греха таить? -- показать использование своих Open Source решений на таком, полу-реальном проекте, чтобы иметь возможность ссылаться на него, а не только на примеры в этих пакетах. Собственно, идея пришла совсем недавно -- приложение будет отображать котировки в виде списка, а также график каждой из котировок, если перейти в конкретный тикер.</p>
<p>К сожалению, в ходе более чем полуторамесячного, прокрастинационного и крайне непростого срока я решил отказаться от первоначальной идеи реализовывать именно биржевые котировки, так как проанализировав (и даже уже использовав в приложении) множество ресурсов пришел к выводу, что ни один из них не предоставляет все необходимую информацию в виде, пригодном для данного проекта без необходимости его переусложнения и с достаточными ограничениями в бесплатной версии. Поэтому выбор пал на криптовалютные API, благо, с ними все намного лучше.</p>
<p>Для интерфейса я нашел такой макет:</p>
<p><img alt="17e35c5b02dd2ccd8d6468b005cb2f78_1-1801-600d65.png" src="https://cdn.otus.ru/media/public/60/0d/17e35c5b02dd2ccd8d6468b005cb2f78_1-1801-600d65.png"></p>
<p>В качестве основы я возьму из этого макета цвета, компоновку экрана и стиль графиков. Экранов, как я пока думаю, будет два.</p>
<p>Первый -- список позиций, которые есть на бирже, а также поиск по ним. Основой будет выступать этот фрагмент дизайна:</p>
<p><img alt="ea3322ae35bef701dedcc6750131a9df_1-1801-36b500.png" src="https://cdn.otus.ru/media/public/36/b5/ea3322ae35bef701dedcc6750131a9df_1-1801-36b500.png"></p>
<p>Второй экран -- переход на страницу самой позиции. Он будет самым интересным -- я планирую реализовать график котировок позиции, отображение текущей цены, и небольшой игровой элемент -- две кнопки Up / Down (как в бинарных опционах, только без реальных денег, обмана и для пользы и интереса). Получится такое мини-игровое приложение, где можно будет не только смотреть котировки, но и "играть" -- введу счетчик побед и что-нибудь с этим связанное (детально этот аспект я пока не прорабатывал -- пишите идеи).</p>
<p><img alt="4936fce1b3efba644f662f57927cab5e_1-1801-455095.png" src="https://cdn.otus.ru/media/public/45/50/4936fce1b3efba644f662f57927cab5e_1-1801-455095.png"></p>
<h2>Реализация</h2>
<p>Ну вот, идею описал, пора переходить к делу. Исходя из всего вышеописанного я могу описать структуру проекта примерно следующим образом:</p>
<pre><div class="codehilite"><pre><span></span>/root
/service
/routing
/di
/...
/domain
/main
/dto
/model
/logic
/ui
/position
/dto
/model
/logic
/ui
</pre></div>
</pre>
<p>Начнем мы с реализации сервисного слоя:</p>
<h3>DI</h3>
<p>Тут на помощь разработчику может прийти большое количество различных пакетов, решающих эту задачу -- с кодогенерацией и без, с большим количеством бойлерплейта и нет, но мне кажется, что это тривиальная задача, и решить её самостоятельно очень просто. Так и сделаем! Вся логика умещается в двух файлах -- сам контейнер, и логика добавления зависимостей в него:</p>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'package:flutter/cupertino.dart'</span><span class="p">;</span>
<span class="kd">class</span> <span class="nc">Di</span> <span class="p">{</span>
<span class="kd">static</span> <span class="kd">final</span> <span class="n">Map</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">dynamic</span><span class="o">></span> <span class="n">_dependencies</span> <span class="o">=</span> <span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">dynamic</span><span class="o">></span><span class="p">{};</span>
<span class="kd">static</span> <span class="kd">final</span> <span class="n">Map</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="n">ValueGetter</span><span class="o"><</span><span class="kt">dynamic</span><span class="o">>></span> <span class="n">_builders</span> <span class="o">=</span> <span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="n">ValueGetter</span><span class="o"><</span><span class="kt">dynamic</span><span class="o">>></span><span class="p">{};</span>
<span class="kd">static</span> <span class="kt">String</span> <span class="n">_generateDiCode</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">([</span><span class="kt">String</span> <span class="n">name</span> <span class="o">=</span> <span class="s1">''</span><span class="p">])</span> <span class="p">{</span>
<span class="k">return</span> <span class="s1">'</span><span class="si">$</span><span class="n">T</span><span class="si">$</span><span class="n">name</span><span class="s1">'</span><span class="p">;</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">reg</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="n">ValueGetter</span><span class="o"><</span><span class="n">T</span><span class="o">></span> <span class="n">builder</span><span class="p">,</span> <span class="p">{</span><span class="kt">String</span> <span class="n">name</span> <span class="o">=</span> <span class="s1">''</span><span class="p">,</span> <span class="kt">bool</span> <span class="n">asBuilder</span> <span class="o">=</span> <span class="kc">false</span><span class="p">})</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">code</span> <span class="o">=</span> <span class="n">_generateDiCode</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="n">name</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">asBuilder</span><span class="p">)</span> <span class="p">{</span>
<span class="n">_builders</span><span class="p">[</span><span class="n">code</span><span class="p">]</span> <span class="o">=</span> <span class="n">builder</span><span class="p">;</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">_dependencies</span><span class="p">[</span><span class="n">code</span><span class="p">]</span> <span class="o">=</span> <span class="n">builder</span><span class="p">();</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="n">T</span> <span class="kd">get</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">({</span><span class="kt">String</span> <span class="n">name</span> <span class="o">=</span> <span class="s1">''</span><span class="p">})</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">code</span> <span class="o">=</span> <span class="n">_generateDiCode</span><span class="o"><</span><span class="n">T</span><span class="o">></span><span class="p">(</span><span class="n">name</span><span class="p">);</span>
<span class="n">late</span> <span class="n">T</span> <span class="n">value</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">_dependencies</span><span class="p">.</span><span class="n">containsKey</span><span class="p">(</span><span class="n">code</span><span class="p">)</span> <span class="o">&&</span> <span class="o">!</span><span class="n">_builders</span><span class="p">.</span><span class="n">containsKey</span><span class="p">(</span><span class="n">code</span><span class="p">))</span> <span class="p">{</span>
<span class="k">throw</span> <span class="n">Exception</span><span class="p">(</span><span class="s1">'Dependency for type </span><span class="si">$</span><span class="n">T</span><span class="s1"> with code </span><span class="si">$</span><span class="n">code</span><span class="s1"> not registered'</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">_dependencies</span><span class="p">.</span><span class="n">containsKey</span><span class="p">(</span><span class="n">code</span><span class="p">))</span> <span class="p">{</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">_dependencies</span><span class="p">[</span><span class="n">code</span><span class="p">];</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">_builders</span><span class="p">[</span><span class="n">code</span><span class="p">]</span><span class="o">!</span><span class="p">();</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">value</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Как и в других решениях мы можем внедрять идентичные сущности, добавляя к ним свои префиксы, и создавать синглтоны, так и постоянно новые инстансы классов.</p>
<p>Второй файл: добавление зависимостей в сам контейнер, чтобы ему было что создавать и возвращать:</p>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'package:flutter/cupertino.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/di/di.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/default_router_information_parser.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/page_builder.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/root_router_delegate.dart'</span><span class="p">;</span>
<span class="kt">void</span> <span class="n">initDependencies</span><span class="p">()</span> <span class="p">{</span>
<span class="n">Di</span><span class="p">.</span><span class="n">reg</span><span class="o"><</span><span class="n">BackButtonDispatcher</span><span class="o">></span><span class="p">(()</span> <span class="o">=></span> <span class="n">RootBackButtonDispatcher</span><span class="p">());</span>
<span class="n">Di</span><span class="p">.</span><span class="n">reg</span><span class="o"><</span><span class="n">RouteInformationParser</span><span class="o"><</span><span class="kt">Object</span><span class="o">>></span><span class="p">(()</span> <span class="o">=></span> <span class="n">DefaultRouterInformationParser</span><span class="p">());</span>
<span class="n">Di</span><span class="p">.</span><span class="n">reg</span><span class="o"><</span><span class="n">RouterDelegate</span><span class="o"><</span><span class="kt">Object</span><span class="o">>></span><span class="p">(()</span> <span class="o">=></span> <span class="n">RootRouterDelegate</span><span class="p">());</span>
<span class="n">Di</span><span class="p">.</span><span class="n">reg</span><span class="p">(()</span> <span class="o">=></span> <span class="n">PageBuilder</span><span class="p">());</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>В будущем, чтобы добавить новые зависимости будет достаточно регистрировать в этой функции их фабрики и все будет работать как надо.</p>
<h3>Routing</h3>
<p>Второй аспект, один из самых сложных в любом приложении. Я буду использовать подход Navigator 2.0.</p>
<p>На самом деле все не сильно сложно, и согласно этой схеме:</p>
<p><img alt="91659100c0b8792f454dae5208e56c19_1-1801-edfcd0.png" src="https://cdn.otus.ru/media/public/ed/fc/91659100c0b8792f454dae5208e56c19_1-1801-edfcd0.png"></p>
<p>нам нужно реализовать следующие классы:</p>
<ul>
<li>RouteInformationProvider</li>
<li>RouteInformationParser</li>
<li>RouterDelegate</li>
<li>Router</li>
</ul>
<p>Их внедрение в контейнер DI я уже проспойлерил, давайте посмотрим, что там внутри.</p>
<h3>RouteInformationProvider</h3>
<p>Представляет собой провайдер дополнительной информации, которая будет добавлена к урлу, по которому осуществляется переход, и передана дальше в <strong>RouteInformationParser</strong>. В целом, это не обязательный фрагмент логики навигации в нашем случае, поэтому пока его реализация остается под вопросом.</p>
<h3>RouteInformationParser</h3>
<p>Должен парсить урл, вытаскивать из него нужные параметры, и передавать их дальше -- в <strong>RouterDelegate</strong>. Вот код нашей реализации (на текущий момент):</p>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'package:flutter/cupertino.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/route_configuration.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/routes.dart'</span><span class="p">;</span>
<span class="kd">class</span> <span class="nc">DefaultRouterInformationParser</span> <span class="kd">extends</span> <span class="n">RouteInformationParser</span><span class="o"><</span><span class="n">RouteConfiguration</span><span class="o">></span> <span class="p">{</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Future</span><span class="o"><</span><span class="n">RouteConfiguration</span><span class="o">></span> <span class="n">parseRouteInformation</span><span class="p">(</span><span class="n">RouteInformation</span> <span class="n">routeInformation</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">Future</span><span class="p">.</span><span class="kd">sync</span><span class="p">(()</span> <span class="o">=></span> <span class="n">Routes</span><span class="p">.</span><span class="n">getRouteConfiguration</span><span class="p">(</span><span class="n">routeInformation</span><span class="p">.</span><span class="n">location</span> <span class="o">??</span> <span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">()));</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Также нам интересен класс RouteConfiguration, вот он:</p>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'package:flutter/cupertino.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/logs/logs.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/routes.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/types/types.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:json_annotation/json_annotation.dart'</span><span class="p">;</span>
<span class="k">part</span> <span class="s1">'route_configuration.g.dart'</span><span class="p">;</span>
<span class="err">@</span><span class="n">immutable</span>
<span class="err">@</span><span class="n">JsonSerializable</span><span class="p">()</span>
<span class="kd">class</span> <span class="nc">RouteConfiguration</span> <span class="p">{</span>
<span class="kd">const</span> <span class="n">RouteConfiguration</span><span class="p">({</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">initialPath</span><span class="p">,</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">routeName</span><span class="p">,</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">routeParams</span><span class="p">,</span>
<span class="p">});</span>
<span class="kd">const</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">empty</span><span class="p">({</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">initialPath</span><span class="p">,</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">routeName</span><span class="p">,</span>
<span class="p">})</span> <span class="o">:</span> <span class="n">routeParams</span> <span class="o">=</span> <span class="kd">const</span> <span class="n">RouteParams</span><span class="p">(</span><span class="nl">params:</span> <span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">String</span><span class="o">></span><span class="p">{},</span> <span class="nl">query:</span> <span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">String</span><span class="o">></span><span class="p">{});</span>
<span class="kd">factory</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">unknown</span><span class="p">()</span> <span class="o">=></span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">empty</span><span class="p">(</span><span class="nl">initialPath:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">unknown</span><span class="p">(),</span> <span class="nl">routeName:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">unknown</span><span class="p">());</span>
<span class="kd">factory</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">fromJson</span><span class="p">(</span><span class="n">Json</span> <span class="n">json</span><span class="p">)</span> <span class="o">=></span> <span class="n">_$RouteConfigurationFromJson</span><span class="p">(</span><span class="n">json</span><span class="p">);</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">initialPath</span><span class="p">;</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">routeName</span><span class="p">;</span>
<span class="kd">final</span> <span class="n">RouteParams</span> <span class="n">routeParams</span><span class="p">;</span>
<span class="n">Json</span> <span class="n">toJson</span><span class="p">()</span> <span class="o">=></span> <span class="n">_$RouteConfigurationToJson</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
<span class="err">@</span><span class="n">override</span>
<span class="kt">String</span> <span class="n">toString</span><span class="p">()</span> <span class="o">=></span> <span class="n">prettyJson</span><span class="p">(</span><span class="n">toJson</span><span class="p">());</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">immutable</span>
<span class="err">@</span><span class="n">JsonSerializable</span><span class="p">()</span>
<span class="kd">class</span> <span class="nc">RouteParams</span> <span class="p">{</span>
<span class="kd">const</span> <span class="n">RouteParams</span><span class="p">({</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">params</span><span class="p">,</span>
<span class="n">required</span> <span class="k">this</span><span class="p">.</span><span class="n">query</span><span class="p">,</span>
<span class="p">});</span>
<span class="kd">factory</span> <span class="n">RouteParams</span><span class="p">.</span><span class="n">fromJson</span><span class="p">(</span><span class="n">Json</span> <span class="n">json</span><span class="p">)</span> <span class="o">=></span> <span class="n">_$RouteParamsFromJson</span><span class="p">(</span><span class="n">json</span><span class="p">);</span>
<span class="kd">final</span> <span class="n">Json</span> <span class="n">params</span><span class="p">;</span>
<span class="kd">final</span> <span class="n">Json</span> <span class="n">query</span><span class="p">;</span>
<span class="n">Json</span> <span class="n">toJson</span><span class="p">()</span> <span class="o">=></span> <span class="n">_$RouteParamsToJson</span><span class="p">(</span><span class="k">this</span><span class="p">);</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Тут вы можете заметить появление еще одного пакета -- json_annotation, он нужен для генерации конструкторов и методов классов для сериализации в JSON и десериализации из JSON. Его необходимо устанавливать совместно еще с парочкой:</p>
<pre><div class="codehilite"><pre><span></span><span class="nl">dependencies:</span>
<span class="nl">json_annotation:</span> <span class="o">^</span><span class="m">4.3</span><span class="p">.</span><span class="m">0</span>
<span class="err">#</span><span class="p">...</span>
<span class="nl">dev_dependencies:</span>
<span class="nl">build_runner:</span> <span class="o">^</span><span class="m">2.1</span><span class="p">.</span><span class="m">4</span>
<span class="nl">json_serializable:</span> <span class="o">^</span><span class="m">6.0</span><span class="p">.</span><span class="m">1</span>
<span class="err">#</span><span class="p">...</span>
</pre></div>
</pre>
<p>Если же говорить о функциональности самого класса -- в него преобразуется любой входящий урл, и из него мы будем брать интересующие нас параметры для дальнейшей логики <strong>RouterDelegate</strong>. Например для такого входящего deep link flutter run --route="/item/AAPL?interval=day" мы получим следующий RouteConfiguration:</p>
<pre><div class="codehilite"><pre><span></span><span class="p">{</span>
<span class="s2">"initialPath"</span><span class="o">:</span> <span class="s2">"/item/AAPL?interval=day"</span><span class="p">,</span>
<span class="s2">"routeName"</span><span class="o">:</span> <span class="s2">"/item/:itemCode"</span><span class="p">,</span>
<span class="s2">"routeParams"</span><span class="o">:</span> <span class="p">{</span>
<span class="s2">"params"</span><span class="o">:</span> <span class="p">{</span>
<span class="s2">"itemCode"</span><span class="o">:</span> <span class="s2">"AAPL"</span>
<span class="p">},</span>
<span class="s2">"query"</span><span class="o">:</span> <span class="p">{</span>
<span class="s2">"interval"</span><span class="o">:</span> <span class="s2">"day"</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Происходит это преобразование урла в конфигурацию в методе <codeinline>Routes.getRouteConfiguration(...)</codeinline>:</p>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'package:high_low/service/routing/route_configuration.dart'</span><span class="p">;</span>
<span class="kd">typedef</span> <span class="n">RouteParamName</span> <span class="o">=</span> <span class="kt">String</span><span class="p">;</span>
<span class="kd">typedef</span> <span class="n">RouteParamValue</span> <span class="o">=</span> <span class="kt">String</span><span class="p">;</span>
<span class="kd">const</span> <span class="kt">String</span> <span class="n">itemCode</span> <span class="o">=</span> <span class="s1">'itemCode'</span><span class="p">;</span>
<span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">Routes</span> <span class="p">{</span>
<span class="kd">static</span> <span class="kt">String</span> <span class="n">root</span><span class="p">()</span> <span class="o">=></span> <span class="s1">'/'</span><span class="p">;</span>
<span class="kd">static</span> <span class="kt">String</span> <span class="n">item</span><span class="p">(</span><span class="kt">String</span> <span class="n">itemCode</span><span class="p">)</span> <span class="o">=></span> <span class="s1">'/item/</span><span class="si">$</span><span class="n">itemCode</span><span class="s1">'</span><span class="p">;</span>
<span class="kd">static</span> <span class="kt">String</span> <span class="n">unknown</span><span class="p">()</span> <span class="o">=></span> <span class="s1">'/404'</span><span class="p">;</span>
<span class="kd">static</span> <span class="n">List</span><span class="o"><</span><span class="kt">String</span><span class="o">></span> <span class="n">names</span> <span class="o">=</span> <span class="p">[</span>
<span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">(),</span>
<span class="n">Routes</span><span class="p">.</span><span class="n">item</span><span class="p">(</span><span class="s1">':</span><span class="si">$</span><span class="n">itemCode</span><span class="s1">'</span><span class="p">),</span>
<span class="n">Routes</span><span class="p">.</span><span class="n">unknown</span><span class="p">(),</span>
<span class="p">];</span>
<span class="kd">static</span> <span class="n">RouteConfiguration</span> <span class="n">getRouteConfiguration</span><span class="p">(</span><span class="kt">String</span> <span class="n">route</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">route</span> <span class="o">==</span> <span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">())</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">empty</span><span class="p">(</span><span class="nl">initialPath:</span> <span class="n">route</span><span class="p">,</span> <span class="nl">routeName:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">());</span>
<span class="p">}</span>
<span class="kd">final</span> <span class="n">Uri</span> <span class="n">routeUri</span> <span class="o">=</span> <span class="n">Uri</span><span class="p">.</span><span class="n">parse</span><span class="p">(</span><span class="n">route</span><span class="p">);</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="kt">String</span><span class="o">></span> <span class="n">routeSubPaths</span> <span class="o">=</span> <span class="n">routeUri</span><span class="p">.</span><span class="n">pathSegments</span><span class="p">;</span>
<span class="k">if</span> <span class="p">(</span><span class="n">routeSubPaths</span><span class="p">.</span><span class="n">isEmpty</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">empty</span><span class="p">(</span><span class="nl">initialPath:</span> <span class="n">route</span><span class="p">,</span> <span class="nl">routeName:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">unknown</span><span class="p">());</span>
<span class="p">}</span>
<span class="k">for</span> <span class="p">(</span><span class="kd">final</span> <span class="kt">String</span> <span class="n">routeName</span> <span class="k">in</span> <span class="n">names</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="kt">String</span><span class="o">></span> <span class="n">routeNameSubPaths</span> <span class="o">=</span> <span class="n">routeName</span><span class="p">.</span><span class="n">split</span><span class="p">(</span><span class="s1">'/'</span><span class="p">).</span><span class="n">where</span><span class="p">((</span><span class="kt">String</span> <span class="n">segment</span><span class="p">)</span> <span class="o">=></span> <span class="n">segment</span><span class="p">.</span><span class="n">isNotEmpty</span><span class="p">).</span><span class="n">toList</span><span class="p">();</span>
<span class="k">if</span> <span class="p">(</span><span class="n">routeNameSubPaths</span><span class="p">.</span><span class="n">length</span> <span class="o">!=</span> <span class="n">routeSubPaths</span><span class="p">.</span><span class="n">length</span><span class="p">)</span> <span class="p">{</span>
<span class="k">continue</span><span class="p">;</span>
<span class="p">}</span>
<span class="kt">bool</span> <span class="n">isTargetName</span> <span class="o">=</span> <span class="kc">true</span><span class="p">;</span>
<span class="kd">final</span> <span class="n">Map</span><span class="o"><</span><span class="n">RouteParamName</span><span class="p">,</span> <span class="n">RouteParamValue</span><span class="o">></span> <span class="n">params</span> <span class="o">=</span> <span class="p">{};</span>
<span class="k">for</span> <span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="m">0</span><span class="p">;</span> <span class="n">i</span> <span class="o"><</span> <span class="n">routeSubPaths</span><span class="p">.</span><span class="n">length</span><span class="p">;</span> <span class="n">i</span><span class="o">++</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">routeSubPath</span> <span class="o">=</span> <span class="n">routeSubPaths</span><span class="p">[</span><span class="n">i</span><span class="p">];</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">routeNameSubPath</span> <span class="o">=</span> <span class="n">routeNameSubPaths</span><span class="p">[</span><span class="n">i</span><span class="p">];</span>
<span class="kd">final</span> <span class="kt">bool</span> <span class="n">isDynamicSubPath</span> <span class="o">=</span> <span class="n">routeNameSubPath</span><span class="p">.</span><span class="n">contains</span><span class="p">(</span><span class="s1">':'</span><span class="p">);</span>
<span class="k">if</span> <span class="p">(</span><span class="n">routeSubPath</span> <span class="o">!=</span> <span class="n">routeNameSubPath</span> <span class="o">&&</span> <span class="o">!</span><span class="n">isDynamicSubPath</span><span class="p">)</span> <span class="p">{</span>
<span class="n">isTargetName</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span>
<span class="k">break</span><span class="p">;</span>
<span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">isDynamicSubPath</span><span class="p">)</span> <span class="p">{</span>
<span class="n">params</span><span class="p">[</span><span class="n">routeNameSubPath</span><span class="p">.</span><span class="n">replaceFirst</span><span class="p">(</span><span class="s1">':'</span><span class="p">,</span> <span class="s1">''</span><span class="p">)]</span> <span class="o">=</span> <span class="n">routeSubPath</span><span class="p">;</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">if</span> <span class="p">(</span><span class="n">isTargetName</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">RouteConfiguration</span><span class="p">(</span><span class="nl">initialPath:</span> <span class="n">route</span><span class="p">,</span> <span class="nl">routeName:</span> <span class="n">routeName</span><span class="p">,</span> <span class="nl">routeParams:</span> <span class="n">RouteParams</span><span class="p">(</span><span class="nl">params:</span> <span class="n">params</span><span class="p">,</span> <span class="nl">query:</span> <span class="n">routeUri</span><span class="p">.</span><span class="n">queryParameters</span><span class="p">));</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="k">return</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">empty</span><span class="p">(</span><span class="nl">initialPath:</span> <span class="n">route</span><span class="p">,</span> <span class="nl">routeName:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">unknown</span><span class="p">());</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Эту логику можно расширить. Например -- сейчас этот код не обработает query-параметры массивы, вроде <em>/item/AAPL?interval=month,day</em>, а на другом способе указания параметров массивов: <em>/item/AAPL?interval=month&interval=day</em> -- Flutter вообще не запускается со следующей ошибкой:</p>
<pre><div class="codehilite"><pre><span></span><span class="nl">ProcessException:</span> <span class="n">Process</span> <span class="n">exited</span> <span class="nl">abnormally:</span>
<span class="nl">Starting:</span> <span class="n">Intent</span> <span class="p">{</span> <span class="n">act</span><span class="o">=</span><span class="n">android</span><span class="p">.</span><span class="n">intent</span><span class="p">.</span><span class="n">action</span><span class="p">.</span><span class="n">RUN</span> <span class="n">flg</span><span class="o">=</span><span class="mh">0x20000000</span> <span class="p">(</span><span class="n">has</span> <span class="n">extras</span><span class="p">)</span> <span class="p">}</span>
<span class="o">/</span><span class="n">system</span><span class="o">/</span><span class="n">bin</span><span class="o">/</span><span class="nl">sh:</span> <span class="o">--</span><span class="nl">ez:</span> <span class="n">inaccessible</span> <span class="n">or</span> <span class="n">not</span> <span class="n">found</span>
<span class="nl">Error:</span> <span class="n">Activity</span> <span class="n">not</span> <span class="n">started</span><span class="p">,</span> <span class="n">unable</span> <span class="n">to</span> <span class="n">resolve</span> <span class="n">Intent</span> <span class="p">{</span> <span class="n">act</span><span class="o">=</span><span class="n">android</span><span class="p">.</span><span class="n">intent</span><span class="p">.</span><span class="n">action</span><span class="p">.</span><span class="n">RUN</span> <span class="n">flg</span><span class="o">=</span><span class="mh">0x30000000</span> <span class="p">(</span><span class="n">has</span> <span class="n">extras</span><span class="p">)</span> <span class="p">}</span>
<span class="nl">Command:</span> <span class="nl">C:</span><span class="err">\\</span><span class="n">Users</span><span class="err">\\</span><span class="n">Mikle</span><span class="err">\\</span><span class="n">AppData</span><span class="err">\\</span><span class="n">Local</span><span class="err">\\</span><span class="n">Android</span><span class="err">\\</span><span class="n">sdk</span><span class="err">\\</span><span class="n">platform</span><span class="o">-</span><span class="n">tools</span><span class="err">\\</span><span class="n">adb</span><span class="p">.</span><span class="n">exe</span> <span class="o">-</span><span class="n">s</span> <span class="n">emulator</span><span class="o">-</span><span class="m">5554</span> <span class="n">shell</span> <span class="n">am</span> <span class="n">start</span> <span class="o">-</span><span class="n">a</span> <span class="n">android</span><span class="p">.</span><span class="n">intent</span><span class="p">.</span><span class="n">action</span><span class="p">.</span><span class="n">RUN</span> <span class="o">-</span><span class="n">f</span> <span class="mh">0x20000000</span> <span class="o">--</span><span class="n">ez</span> <span class="n">enable</span><span class="o">-</span><span class="n">background</span><span class="o">-</span><span class="n">compilation</span> <span class="kc">true</span> <span class="o">--</span><span class="n">ez</span> <span class="n">enable</span><span class="o">-</span><span class="n">dart</span><span class="o">-</span><span class="n">profiling</span> <span class="kc">true</span> <span class="o">--</span><span class="n">es</span> <span class="n">route</span> <span class="o">/</span><span class="n">item</span><span class="o">/</span><span class="n">AAPL</span><span class="o">?</span><span class="n">interval</span><span class="o">=</span><span class="n">month</span><span class="o">&</span><span class="n">interval</span><span class="o">=</span><span class="n">day</span> <span class="o">--</span><span class="n">ez</span> <span class="n">enable</span><span class="o">-</span><span class="n">checked</span><span class="o">-</span><span class="n">mode</span> <span class="kc">true</span> <span class="o">--</span><span class="n">ez</span> <span class="n">verify</span><span class="o">-</span><span class="n">entry</span><span class="o">-</span><span class="n">points</span> <span class="kc">true</span> <span class="o">--</span><span class="n">ez</span> <span class="n">start</span><span class="o">-</span><span class="n">paused</span> <span class="kc">true</span> <span class="n">com</span><span class="p">.</span><span class="n">alphamikle</span><span class="p">.</span><span class="n">high_low</span><span class="o">/</span><span class="n">com</span><span class="p">.</span><span class="n">alphamikle</span><span class="p">.</span><span class="n">high_low</span><span class="p">.</span><span class="n">MainActivity</span>
</pre></div>
</pre>
<p>В общем -- брать за основу этот код можно смело, но под специфичные урлы своего проекта еще нужно будет дорабатывать.</p>
<h3>RouterDelegate</h3>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'dart:async'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:flutter/material.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/domain/main/ui/main_view.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/di/di.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/logs/logs.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/page_builder.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/route_configuration.dart'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:high_low/service/routing/routes.dart'</span><span class="p">;</span>
<span class="kd">class</span> <span class="nc">RootRouterDelegate</span> <span class="kd">extends</span> <span class="n">RouterDelegate</span><span class="o"><</span><span class="n">RouteConfiguration</span><span class="o">></span> <span class="kd">with</span> <span class="n">ChangeNotifier</span><span class="p">,</span> <span class="n">PopNavigatorRouterDelegateMixin</span><span class="o"><</span><span class="n">RouteConfiguration</span><span class="o">></span> <span class="p">{</span>
<span class="n">RootRouterDelegate</span><span class="p">()</span> <span class="o">:</span> <span class="n">navigatorKey</span> <span class="o">=</span> <span class="n">GlobalKey</span><span class="p">();</span>
<span class="err">@</span><span class="n">override</span>
<span class="kd">final</span> <span class="n">GlobalKey</span><span class="o"><</span><span class="n">NavigatorState</span><span class="o">></span> <span class="n">navigatorKey</span><span class="p">;</span>
<span class="n">PageBuilder</span> <span class="kd">get</span> <span class="n">pageBuilder</span> <span class="o">=></span> <span class="n">Di</span><span class="p">.</span><span class="kd">get</span><span class="p">();</span>
<span class="kd">final</span> <span class="n">List</span><span class="o"><</span><span class="n">Page</span><span class="o">></span> <span class="n">pages</span> <span class="o">=</span> <span class="p">[];</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">RouteConfiguration</span> <span class="n">currentConfiguration</span> <span class="o">=</span> <span class="n">RouteConfiguration</span><span class="p">.</span><span class="n">empty</span><span class="p">(</span><span class="nl">initialPath:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">(),</span> <span class="nl">routeName:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">());</span>
<span class="kt">bool</span> <span class="n">onPopRoute</span><span class="p">(</span><span class="n">Route</span><span class="o"><</span><span class="kt">dynamic</span><span class="o">></span> <span class="n">route</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">data</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span> <span class="p">(</span><span class="n">route</span><span class="p">.</span><span class="n">didPop</span><span class="p">(</span><span class="n">data</span><span class="p">)</span> <span class="o">==</span> <span class="kc">false</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="kc">false</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">pages</span><span class="p">.</span><span class="n">removeLast</span><span class="p">();</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="k">return</span> <span class="kc">true</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">mapRouteConfigurationToRouterState</span><span class="p">(</span><span class="n">RouteConfiguration</span> <span class="n">configuration</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="kd">final</span> <span class="kt">String</span> <span class="n">name</span> <span class="o">=</span> <span class="n">configuration</span><span class="p">.</span><span class="n">routeName</span><span class="p">;</span>
<span class="n">pages</span><span class="p">.</span><span class="n">clear</span><span class="p">();</span>
<span class="k">if</span> <span class="p">(</span><span class="n">name</span> <span class="o">==</span> <span class="n">Routes</span><span class="p">.</span><span class="n">unknown</span><span class="p">())</span> <span class="p">{</span>
<span class="c1">// openUnknownView();</span>
<span class="n">Logs</span><span class="p">.</span><span class="n">warn</span><span class="p">(</span><span class="s1">'TODO: Open Unknown View'</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Future</span><span class="o"><</span><span class="kt">void</span><span class="o">></span> <span class="n">setNewRoutePath</span><span class="p">(</span><span class="n">RouteConfiguration</span> <span class="n">configuration</span><span class="p">)</span> <span class="kd">async</span> <span class="p">{</span>
<span class="n">Logs</span><span class="p">.</span><span class="n">debug</span><span class="p">(</span><span class="s1">'setNewRoutePath: </span><span class="si">$</span><span class="n">configuration</span><span class="s1">'</span><span class="p">);</span>
<span class="n">currentConfiguration</span> <span class="o">=</span> <span class="n">configuration</span><span class="p">;</span>
<span class="kd">await</span> <span class="n">mapRouteConfigurationToRouterState</span><span class="p">(</span><span class="n">configuration</span><span class="p">);</span>
<span class="n">notifyListeners</span><span class="p">();</span>
<span class="p">}</span>
<span class="err">@</span><span class="n">override</span>
<span class="n">Widget</span> <span class="n">build</span><span class="p">(</span><span class="n">BuildContext</span> <span class="n">context</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="n">Navigator</span><span class="p">(</span>
<span class="nl">key:</span> <span class="n">navigatorKey</span><span class="p">,</span>
<span class="nl">pages:</span> <span class="p">[</span>
<span class="n">pageBuilder</span><span class="p">.</span><span class="n">buildUnAnimatedPage</span><span class="p">(</span><span class="kd">const</span> <span class="n">MainView</span><span class="p">(),</span> <span class="nl">name:</span> <span class="n">Routes</span><span class="p">.</span><span class="n">root</span><span class="p">()),</span>
<span class="p">...</span><span class="n">pages</span><span class="p">,</span>
<span class="p">],</span>
<span class="nl">onPopPage:</span> <span class="n">onPopRoute</span><span class="p">,</span>
<span class="p">);</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<p>Это только основа делегата, но из интересного тут -- метод <codeinline>mapRouteConfigurationToRouterState</codeinline>, который вызывается из метода <codeinline>setNewRoutePath</codeinline> -- который, в свою очередь, и обрабатывает конфигурации роутинга, поступающие сюда из <strong>RouteInformationParser</strong>. В будущем мы будем писать здесь методы навигации.</p>
<h3>Logging</h3>
<p>Последний пункт -- логирование. Тут все совсем просто -- я сделал небольшую обертку поверх библиотеки logging, которая, как по мне -- дает одни из лучших возможностей по логированию. Теперь мы можем передавать любые аргументы в методы логирования.</p>
<pre><div class="codehilite"><pre><span></span><span class="k">import</span> <span class="s1">'dart:convert'</span><span class="p">;</span>
<span class="k">import</span> <span class="s1">'package:logger/logger.dart'</span> <span class="k">as</span> <span class="n">logger</span><span class="p">;</span>
<span class="kt">String</span> <span class="n">_getJoinedArguments</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="kt">String</span> <span class="n">result</span> <span class="o">=</span> <span class="n">p1</span><span class="p">.</span><span class="n">toString</span><span class="p">();</span>
<span class="n">result</span> <span class="o">+=</span> <span class="n">p2</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">?</span> <span class="s1">''</span> <span class="o">:</span> <span class="s1">' </span><span class="si">${</span><span class="n">p2</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span><span class="si">}</span><span class="s1">'</span><span class="p">;</span>
<span class="n">result</span> <span class="o">+=</span> <span class="n">p3</span> <span class="o">==</span> <span class="kc">null</span> <span class="o">?</span> <span class="s1">''</span> <span class="o">:</span> <span class="s1">' </span><span class="si">${</span><span class="n">p3</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span><span class="si">}</span><span class="s1">'</span><span class="p">;</span>
<span class="k">return</span> <span class="n">result</span><span class="p">;</span>
<span class="p">}</span>
<span class="kt">String</span> <span class="n">prettyJson</span><span class="p">(</span><span class="n">Map</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">dynamic</span><span class="o">></span> <span class="n">json</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">const</span> <span class="n">JsonEncoder</span> <span class="n">jsonEncoder</span> <span class="o">=</span> <span class="n">JsonEncoder</span><span class="p">.</span><span class="n">withIndent</span><span class="p">(</span><span class="s1">' '</span><span class="p">);</span>
<span class="k">return</span> <span class="n">jsonEncoder</span><span class="p">.</span><span class="n">convert</span><span class="p">(</span><span class="n">json</span><span class="p">);</span>
<span class="p">}</span>
<span class="kd">final</span> <span class="n">_logger</span> <span class="o">=</span> <span class="n">logger</span><span class="p">.</span><span class="n">Logger</span><span class="p">(</span>
<span class="nl">printer:</span> <span class="n">logger</span><span class="p">.</span><span class="n">PrefixPrinter</span><span class="p">(</span>
<span class="n">logger</span><span class="p">.</span><span class="n">PrettyPrinter</span><span class="p">(</span>
<span class="nl">colors:</span> <span class="kc">true</span><span class="p">,</span>
<span class="nl">printEmojis:</span> <span class="kc">false</span><span class="p">,</span>
<span class="nl">methodCount:</span> <span class="m">0</span><span class="p">,</span>
<span class="nl">errorMethodCount:</span> <span class="m">3</span><span class="p">,</span>
<span class="nl">stackTraceBeginIndex:</span> <span class="m">0</span><span class="p">,</span>
<span class="p">),</span>
<span class="p">),</span>
<span class="p">);</span>
<span class="kd">abstract</span> <span class="kd">class</span> <span class="nc">Logs</span> <span class="p">{</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">debug</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">_logger</span><span class="p">.</span><span class="n">d</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">info</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">_logger</span><span class="p">.</span><span class="n">i</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">warn</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">_logger</span><span class="p">.</span><span class="n">w</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">error</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">_logger</span><span class="p">.</span><span class="n">e</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">fatal</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">_logger</span><span class="p">.</span><span class="n">wtf</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">trace</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">_logger</span><span class="p">.</span><span class="n">v</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="kd">static</span> <span class="kt">void</span> <span class="n">pad</span><span class="p">(</span><span class="kt">dynamic</span> <span class="n">p1</span><span class="p">,</span> <span class="p">[</span><span class="kt">dynamic</span> <span class="n">p2</span><span class="p">,</span> <span class="kt">dynamic</span> <span class="n">p3</span><span class="p">])</span> <span class="p">{</span>
<span class="n">print</span><span class="p">(</span><span class="n">_getJoinedArguments</span><span class="p">(</span><span class="n">p1</span><span class="p">,</span> <span class="n">p2</span><span class="p">,</span> <span class="n">p3</span><span class="p">));</span>
<span class="p">}</span>
<span class="p">}</span>
</pre></div>
</pre>
<h3>Другое</h3>
<p>Еще вы могли заметить тип Json -- это алиас, располагаемый в файле types.dart. В этот файл мы будем писать и другие алиасы, которые будут использоваться в приложении:</p>
<pre><div class="codehilite"><pre><span></span><span class="kd">typedef</span> <span class="n">Json</span> <span class="o">=</span> <span class="n">Map</span><span class="o"><</span><span class="kt">String</span><span class="p">,</span> <span class="kt">dynamic</span><span class="o">></span><span class="p">;</span>
</pre></div>
</pre>
<p>Для использования алиасов не только для функций необходимо повысить минимальную версию Dart в <em>pubspec.yaml до >= 2.14.0</em>.</p>
<h3>Заключение</h3>
<p>На текущий момент реализована самая базовая логика, которая нужна для дальнейшей разработки бизнес-функционала. Исходный код текущей части можно посмотреть <a href="https://github.com/alphamikle/high_low/tree/2a6a9b9e050859285ea4a0ad10db5a04ea0ff411">здесь</a>.</p>
<p>Продолжение <a href="https://otus.ru/nest/post/2430/">здесь</a>.</p>
<p>Больше материалов смотрите <a href="https://habr.com/ru/users/alphamikle/">в моем блоге</a> на Хабре. </p>
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class="new-input new-input_full js-placeholder js-input
js-required
"
maxlength="255"
name="phone"
autocomplete="off"
data-js-mask="phone"
required
placeholder="Телефон"
/>
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