flutter - 升级后无法在Flutter 1.12.13 + hotfix.5中构建我的应用

Question

我当时正在开发应用程序，并且一切都按计划进行，然后将flutter 升级到了最新版本。

我尝试过 flutter doctor -v 一切看起来很好。

这是我尝试构建应用程序时收到的错误消息:

Compiler message:
/C:/src/flutter/.pub-cache/hosted/pub.dartlang.org/cached_network_image-1.1.3/lib/src/cached_network_image_provider.dart:42:24: Error: The method 'CachedNetworkImageProvider.load' has fewer positional arguments than those of overridden method 'ImageProvider.load'.
  ImageStreamCompleter load(CachedNetworkImageProvider key) {
                       ^
/C:/src/flutter/packages/flutter/lib/src/painting/image_provider.dart:403:24: Context: This is the overridden method ('load').
  ImageStreamCompleter load(T key, DecoderCallback decode);
                       ^
Target kernel_snapshot failed: Exception: Errors during snapshot creation: null
build failed.

FAILURE: Build failed with an exception.

* Where:
Script 'C:\src\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 780

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'C:\src\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 19s

Answer 1

似乎Flutter已在this commit中添加了DecoderCallback，现在它是load函数的必需参数。查看您使用的cached_network_image依赖关系，此问题已在其README.md中说明:

If you are experiencing one of the following errors upgrade to 2.0.0-rc.

因此，您可以通过升级 cached_network_image中的 pubspec.yml来解决此问题。