flutter 中switch case 报错 Case expressions must be constant,如下图所示的switchcase会报错如上意思说必须是常量,但是按道理来说上面写的是常量了,还是不行,然后将final改成const就可以了,如下图:如上所示即可...
长时间没有反应或者后面出现connect连接有问题 可以是环境变量没有配置,配置如下: export PUB_HOSTED_URL=https://pub.flutter-io.cnexport FLUTTER_STORAGE_BASE_URL=
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步骤一：构建一个人工智能模型才能让机器学会像人一样说话，在这里，使用python语言编写脚本，基于堆叠...
dart/52191- Fixes incorrect error using a void in a switch case expression. dart/52041- Fixes a false error when using in switch case expressions when the switch refers to a private getter. dart/52260- Prevent the use of when and as as variable names in patterns. ...
// In constant expressions, operands of this operator must be of type 'bool', 'num', 'String' or 'null' // 在常量表达式中,该运算符的操作数必须为'bool'、'num'、'String'或'null'。 const validConstString = '$outSideName $outSideName2 $aConstList'; ...
dart/52191 - Fixes incorrect error using a void in a switch case expression. dart/52041 - Fixes a false error when using in switch case expressions when the switch refers to a private getter. dart/52260 - Prevent the use of when and as as variable names in patterns. dart/52241 - Fixes...
// 常量如果是类级别的,请使用 static conststaticconstStringname3='Tom';constStringoutSideName='Bill';finalStringoutSideFinalName='Alex';constStringoutSideName2='Tom';constaConstList=const['1','2','3'];// In constant expressions, operands of this operator must be of type 'bool', 'num'...
# Specify analysis options.## Until there are meta linter rules, each desired lint must be explicitly enabled.# See: https://github.com/dart-lang/linter/issues/288## For a list of lints, see: http://dart-lang.github.io/linter/lints/# See the configuration guide for more# https://...
Flutter 1.0 was launched on Dec 4th, 2018. Thousands of apps have shipped with Flutter to hundreds of millions of devices. See some sample apps in theshowcase. For more information on the launch and subsequent releases, seeFlutter 1.0: Google’s Portable UI Toolkit. ...