Flutter 3.0：在添加和使用弹奏插件之后获取错误
添加了字幕插件并使用它后，我总是会遇到此错误，
../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/fading_edge_scrollview-2.0.1/lib/src/fading_edge_scrollview.dart:195:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../development/flutter/packages/flutter/lib/src/widgets/binding.dart').
WidgetsBinding.instance?.let((it) {
^
../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/fading_edge_scrollview-2.0.1/lib/src/fading_edge_scrollview.dart:220:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../development/flutter/packages/flutter/lib/src/widgets/binding.dart').
WidgetsBinding.instance?.removeObserver(this);
我删除了插件并删除了字幕，并且该应用程序正在运行而没有错误。 字幕插件有问题吗？
^
After i added the marquee plugin and used it, I always get this error
../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/fading_edge_scrollview-2.0.1/lib/src/fading_edge_scrollview.dart:195:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../development/flutter/packages/flutter/lib/src/widgets/binding.dart').
WidgetsBinding.instance?.let((it) {
^
../../../development/flutter/.pub-cache/hosted/pub.dartlang.org/fading_edge_scrollview-2.0.1/lib/src/fading_edge_scrollview.dart:220:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../development/flutter/packages/flutter/lib/src/widgets/binding.dart').
WidgetsBinding.instance?.removeObserver(this);
I removed the plugin and deleted the marquee and the application is running without an error.
Is there something wrong with the marquee plugin ?
^
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不幸的是，Flutter 3.0.0引入了某些属性的无效性变化。
仍在积极开发的最常见的软件包发布了更新版本以支持它。
fading_edge_scrollview似乎是这里没有更新版本的版本（尚未）。我不知道它是否正在积极发展。您可以尝试分叉并自己修复它，也可以忽略警告。
因为这实际上只是警告。即使在这些警告下，您的应用程序仍应正常工作。
Unfortunately Flutter 3.0.0 introduced some changes in the nullability of some properties.
The most common packages that are still actively being developed released updated versions to support it.
fading_edge_scrollviewseems the be the one here that doesn't have an updated version (yet). I have no idea if it's being actively developed.You could try to fork it and fix it yourself, or you could just ignore the warning.
Because it is in fact only a warning. Your app should still work properly even with those warnings.