【发布时间】：2021-06-02 20:52:56
【问题描述】：
升级到 Flutter 2.0.0 后，我无法再构建应用程序了。这是输出。我的问题是我大量使用库，其中很多不是空安全的，我无法将所有依赖项升级到空安全模式。有人对此有什么建议吗？
Try calling using ?. instead.
).replaceFirst(r'$remainingCount', formatDecimal(remainingCount));
^^^^^^^^^^^^
../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/extended_image-1.6.0/lib/src/extended_image.dart:785:44: Error: No named parameter with the name 'nullOk'.
_invertColors = MediaQuery.of(context, nullOk: true)?.invertColors ??
^^^^^^
../../flutter/flutter/packages/flutter/lib/src/widgets/media_query.dart:818:25: Context: Found this candidate, but the arguments don't match.
static MediaQueryData of(BuildContext context) {
^^
../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.18.1/lib/src/picture_provider.dart:50:59: Error: No named parameter with the name 'nullOk'.
context != null ? Localizations.localeOf(context, nullOk: true) : null,
^^^^^^
../../flutter/flutter/packages/flutter/lib/src/widgets/localizations.dart:413:17: Context: Found this candidate, but the arguments don't match.
static Locale localeOf(BuildContext context) {
^^^^^^^^
更新1：更新到flutter 2.0.1和flutter pub cache repair和flutter clean之后。并使用标志flutter run --no-sound-null-safety 运行。仍然没有机会运行应用程序，这是输出。
../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_neumorphic-3.0.3/lib/src/widget/app_bar.dart:147:57: Error: No named parameter with the name 'nullOk'.
final ScaffoldState scaffold = Scaffold.of(context, nullOk: true);
^^^^^^
../../flutter/flutter/packages/flutter/lib/src/material/scaffold.dart:1944:24: Context: Found this candidate, but the arguments don't match.
static ScaffoldState of(BuildContext context) {
^^
../../flutter/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_svg-0.19.1/lib/src/picture_provider.dart:52:59: Error: No named parameter with the name 'nullOk'.
context != null ? Localizations.localeOf(context, nullOk: true) : null,
^^^^^^
../../flutter/flutter/packages/flutter/lib/src/widgets/localizations.dart:413:17: Context: Found this candidate, but the arguments don't match.
static Locale localeOf(BuildContext context) {
^^^^^^^^
FAILURE: Build failed with an exception.
* Where:
Script 'D:\Documents\flutter\flutter\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 991
* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'D:\Documents\flutter\flutter\flutter\bin\flutter.bat'' finished with non-zero exit value 1
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 26s
更新2：这是flutter doctor的输出
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 2.0.1, on Microsoft Windows [Version 10.0.19042.804], locale en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2019 16.8.4)
[√] Android Studio (version 4.1.0)
[√] IntelliJ IDEA Ultimate Edition (version 2020.3)
[√] VS Code (version 1.54.1)
[√] Connected device (4 available)
• No issues found!
【问题讨论】：
-
解决了吗？
-
不，我目前正在使用 Flutter 1.22.6 来构建我的项目，直到所有依赖项都迁移到 null 安全性，然后查看新的 Flutter 是否有效。
-
这里一样，我也切换到1.22
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有关于这个问题的消息吗？
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不，很遗憾，由于我的项目的某些包仍未迁移到 null 安全性，我仍在使用 1.22.6 版本的颤振。