我将我的颤振更新到 1.22.0，现在我的 video_player 给了我异常错误。在我将颤振更新到 1.22.0 之前，它运行良好。
这是我的错误：
E/flutter (8545): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] 未处理的异常：'package:flutter/src/services/message_codec.dart'：断言失败：第 111 行 pos 15：'代码!= null': 不正确。E/flutter (8545): #0
_AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:46:39) E/flutter (8545): #1 _AssertionError._throwNew (dart:core-patch/errors_patch.dart: 36:5) E/flutter (8545): #2
new PlatformException (package:flutter/src/services/message_codec.dart:111:15) E/flutter (8545): #3 VideoPlayerApi.create (package:video_player_platform_interface/messages .dart:205:13) E/颤振（8545）：E/颤振（8545）：#4
MethodChannelVideoPlayer.create (package:video_player_platform_interface/method_channel_video_player.dart:46:42) E/flutter (8545): #5 VideoPlayerController.initialize (package:video_player/video_player.dart:275:45) E/flutter (8545): #6 _ScreenBackgroundVideoState.initState (package:flow/widget/background/screen_background_video.dart:17:9) E/flutter (8545): #7 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4765:58) E /flutter ( 8545): #8 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4601:5) E/flutter (8545): #9 Element.inflateWidget (package:flutter/src/widgets/framework .dart:3569:14) E/flutter (8545): #10 MultiChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:6236:32) E/flutter (8545): #11 Element.inflateWidget (package …
我在欢迎屏幕中实现了延迟动画，但在我的 flutter 应用程序中出现以下错误。如果我的代码中有错误，请告诉我，我可以纠正并解决此问题。
错误是：
E/flutter (11565): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)]
Unhandled Exception:
'package:flutter/src/animation/animation_controller.dart': Failed
assertion: line 455 pos 7: '_ticker != null':
AnimationController.forward() called after
AnimationController.dispose()
这是我的代码：
E/flutter (11565): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)]
Unhandled Exception:
'package:flutter/src/animation/animation_controller.dart': Failed
assertion: line 455 pos 7: '_ticker != null':
AnimationController.forward() called after
AnimationController.dispose()
我有以下信息：
final startDateTime = DateTime(2020, 7, 6, 18, 00);
final endDateTime = DateTime(2020, 7, 7, 19, 00);
final currentDateTime = DateTime.now();
如何确定 currentDateTime 是否在 startDateTime 和 endDateTime 之间。