标签: dart-pub

这是我的时间戳=“2020-05-29T17:43:39.622832+05:30”。我如何将它传递给函数 readTimeStamp （它会给我不是 int 类型的错误）？

date = DateTime.parse(bookDetails.timestamp);
   print(readTimestamp(date));

String readTimestamp(int timestamp) {
  var now = DateTime.now();
  var date = DateTime.fromMillisecondsSinceEpoch(timestamp * 1000);
  var diff = now.difference(date);
  String time = '';

  if (diff.inSeconds <= 0 ||
      diff.inSeconds > 0 && diff.inMinutes == 0 ||
      diff.inMinutes > 0 && diff.inHours == 0 ||
      diff.inHours > 0 && diff.inDays == 0) {
  } else if (diff.inDays > 0 && diff.inDays < 7) {
    if (diff.inDays == 1) {
      time = diff.inDays.toString() + …

我正在尝试编译https://github.com/dart-lang/protobuf/tree/master/protoc_plugin

根据自述文件，我应该运行pub install. 我有 flutter SDK，应该包含 Dart SDK。

我试过：

flutter pub install

Could not find a subcommand named "install" for "flutter pub".

和

dart pub install

Error: Error when reading 'pub': No such file or directory

和

pub install

/bin/sh: 1: pub: not found

如何使用flutter SDK编译它？

当我尝试在 iOS 模拟器上启动我的 flutter 应用程序时，我看到一个白色的空白屏幕，如下所示：

 Launching lib/main.dart on iPhone 12 Pro Max in debug mode...\nRunning Xcode build...                                                  \n \xe2\x94\x94\xe2\x94\x80Compiling, linking and signing...                        13.7s\nXcode build done.                                           38.0s\n[VERBOSE-2:ui_dart_state.cc(186)] Unhandled Exception: Invalid argument(s): Object/factory with  type Api is already registered inside GetIt. \n#0      throwIf (package:get_it/get_it_impl.dart:7:18)\n#1      _GetItImplementation._register (package:get_it/get_it_impl.dart:729:5)\n#2      _GetItImplementation.registerLazySingleton (package:get_it/get_it_impl.dart:502:5)\n#3      setupLocator (package:r/locator.dart:14:18)\n#4      main (package:r/main.dart:12:3)\n#5      _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:140:25)\n#6      _rootRun (dart:async/zone.dart:1354:13)\n#7      _CustomZone.run (dart:async/zone.dart:1258:19)\n#8      _runZoned (dart:async/zone.dart:1788:10)\n#9      runZonedGuarded (dart:async/zone.dart:1776:12)\n#10     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:133:5)\n#11     _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:283:19)\n#12     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.<\xe2\x80\xa6>\nSyncing files to device iPhone 12 Pro Max...                       137ms\n

integration_test自从我尝试添加package 以来，我一直收到错误get_test，这主要是由于just_audio取决于crypto: ^3.0.0whileintegration_test取决于crypto: ^2.1.5。

我尝试在网上查看是否可以只安装没有 dev_dependency 的依赖项，但是基于此问题， flutter pub cli 工具似乎还不支持这一点。

这是我的pubspec.yaml

environment:
  sdk: ">=2.7.0 <3.0.0"

dependencies:
  flutter:
    sdk: flutter

  cupertino_icons: ^1.0.2
  share: ^2.0.1
  get:
  get_storage:
  shared_preferences: ^2.0.5
  audio_service: 0.17.0-nullsafety.0
  just_audio: ^0.7.4

dev_dependencies:
  flutter_test:
    sdk: flutter

  get_test: ^3.13.3
  integration_test: ^1.0.2+1
  test: ^1.14.4

这是我收到的错误。

Because every version of integration_test depends on flutter_driver any from sdk which depends on crypto 2.1.5, every version of integration_test requires crypto 2.1.5.
And …

每当我尝试进行注册并点击注册按钮时，我都会遇到这种类型的问题，即对空值使用空检查运算符。\n我收到此错误消息

\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90 手势捕获异常 \xe2\x95\x90\xe2\x95 \x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90 \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2 \x95\x90\xe2\x95\x90

处理手势时引发以下 _CastError:\n对 null 值使用 Null 检查运算符

当异常抛出时，这是堆栈

#0 _AuthorizationState.build。\npackage:gr_space/screens/profile_screen.dart:244

#1 _InkResponseState._handleTap\npackage:flutter/\xe2\x80\xa6/material/ink_well.dart:989

#2 GestureRecognizer.invokeCallback\npackage:flutter/\xe2\x80\xa6/gestures/recognizer.dart:182

#3 TapGestureRecognizer.handleTapUp

包：flutter/\xe2\x80\xa6/gestures/tap.dart:607

#4 BaseTapGestureRecognizer._checkUp\npackage:flutter/\xe2\x80\xa6/gestures/tap.dart:296

...\n处理程序：“onTap”\n识别器：TapGestureRecognizer#f8d29\ndebugOwner：GestureDetector\n状态：就绪\nwon arena\nfinalPosition：偏移（215.0，716.5）\nfinalLocalPosition：偏移（199.0，16.0）\n按钮：1\nsent向下点击\n\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95 \x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90 \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2 \x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95 \x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90 \xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2 \x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90\xe2\x95\x90

这是我的身份验证屏幕。飞镖文件

import 'package:flutter/material.dart';\n\nenum AuthMode { Signup, Login }\n\nclass ProfileScreen extends StatelessWidget {\n  static const routeName = '/profile';\n  @override\n  Widget build(BuildContext context) {\n    return AnimatedContainer(\n      duration: Duration(milliseconds: 300),\n      child: Authorization(),\n    );\n  }\n}\n\nclass Authorization extends StatefulWidget {\n …

我手动删除了外部库/dart包中的包。现在我再次尝试跑步packages get。包（tesseract_ocr）没有出现在外部库/dart包中。我尝试在 pubspec.yaml 中删除它并重新添加它，但没有再次出现。我尝试删除.pub-cache并packages get再次运行。我尝试了flutter clean很多次，但都没有使tessarect_ocrflutter pub cache repair包重新出现在外部库/dart 包中。请帮忙。提前致谢！flutter pub cache add tessarect_ocrpackages get