Flutter 2：Intl null 安全库中的问题

Question

我将我的 flutter sdk 升级到 flutter 2.0.0。更新 sdk 后，我已将几乎所有库更改为 null 安全版本：

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environment:\n  sdk: \'>=2.12.0 <3.0.0\'\n\ndependencies:\n  flutter:\n    sdk: flutter\n  flutter_localizations:\n    sdk: flutter \n  cupertino_icons: ^0.1.3\n  encrypt: ^4.1.0\n  flutter_hooks: ^0.15.0\n  flutter_map: ^0.11.0\n  flutter_password_strength: ^0.1.5\n  flutter_svg: ^0.18.0\n  geolocator: ^7.0.1\n  get: ^3.25.6\n  get_it: ^6.0.0\n  injectable: ^1.1.2\n  local_auth: ^1.1.0\n  moor_flutter: ^3.1.0\n  provider: ^5.0.0\n  shared_preferences: ^2.0.3\n  supercharged: ^1.12.0\n  intl: ^0.17.0\n

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更新后我运行 dart$ dart migrate命令。但它显示了有关 intl 插件的这些问题：

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Analyzing project...\n[---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------/]\n5 analysis issues found:\n  error \xe2\x80\xa2 A value of type \'Null\' can\'t be returned from the function \'_findExact\' because it has a return type of \'MessageLookupByLibrary\' at lib/generated/intl/messages_all.dart:34:14 \xe2\x80\xa2 (return_of_invalid_type)\n  error \xe2\x80\xa2 A value of type \'Null\' can\'t be returned from the function \'_findGeneratedMessagesFor\' because it has a return type of \'MessageLookupByLibrary\' at lib/generated/intl/messages_all.dart:65:36 \xe2\x80\xa2 (return_of_invalid_type)\n  error \xe2\x80\xa2 Non-nullable instance field \'current\' must be initialized at lib/generated/l10n.dart:16:3 \xe2\x80\xa2 (not_initialized_non_nullable_instance_field)\n  error \xe2\x80\xa2 The non-nullable variable \'current\' must be initialized at lib/generated/l10n.dart:18:12 \xe2\x80\xa2 (not_initialized_non_nullable_variable)\n  error \xe2\x80\xa2 A value of type \'S?\' can\'t be returned from the method \'of\' because it has a return type of \'S\' at lib/generated/l10n.dart:35:12 \xe2\x80\xa2 (return_of_invalid_type)\n\nThe migration tool didn\'t start, due to analysis errors.\n

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我正在使用最新版本的 intl ？我该如何解决这个问题？

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Doctor summary (to see all details, run flutter doctor -v):\n[\xe2\x9c\x93] Flutter (Channel stable, 2.0.0, on Linux, locale en_US.UTF-8)\n[\xe2\x9c\x93] Android toolchain - develop for Android devices (Android SDK version 30.0.0-rc1)\n[\xe2\x9c\x93] Chrome - develop for the web\n[\xe2\x9c\x93] Android Studio (version 4.0)\n[\xe2\x9c\x93] VS Code (version 1.53.2)\n[\xe2\x9c\x93] Connected device (2 available)\n\n\xe2\x80\xa2 No issues found!\n

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Answer 1

我遇到过同样的问题。以下是解决此问题的 3 个步骤：

1. 首先，将intl依赖项更新为pubspec.yaml：

   国际：0.17.0-nullsafety.2

2. 如果仍然不起作用，则在根目录中添加这两个字段。

   dependency_overrides：intl：0.17.0-nullsafety.2

3. 生成也可以通过 Android Studio 中的插件进行。我使用旧版本（v 0.12），更新到（v 0.14）后，它开始生成用于本地化的空安全 dart 文件。

我想我踩过这里的每一块岩石。