未定义名称“上下文” [英] Undefined name 'context'
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问题描述
我是flutter的新手，在flutter.io之后，在小部件主题中，我们有警报对话框类小部件，
谢谢。
解决方案
由于定义了此方法，它看起来不是Widget类之外的内容，因此 context 成员不存在。使用时，您需要将一种方法传递给该方法。
将方法更改为此：
...
Future< void> _neverSatisfied（BuildContext context）异步{
...
I am new to flutter, following the flutter.io and in widgets topic we have the Alert Dialog class widget, https://docs.flutter.io/flutter/material/AlertDialog-class.html
There we have some sample code and getting the below errors in it. Can anyone help in solving them.
Thanks.
解决方案
Because this method is defined what looks to be outside of a Widget class, the context member of a Widget class doesn't exist. You need to pass one into this method when you use.
Changed your method to this:
...
Future<void> _neverSatisfied(BuildContext context) async {
...
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