how to solve BuildContexts across async gaps error flutter

Question

I am facing this issue and didn’t know what to do here

showSnackbar(
        context,
        text: StatusCodes.absenceCancelResponse[statusCode],
        color: Colors.green,
      );

      class StatusCode
      {
        static Map<int, String> absenceCancelResponse = {
              0: "Absence Request Canceled Successfully",
              1: "Error Cancelling Absence Request",
         };
      
      }

Everything working fine but I am annoyed by this warning

Do not use BuildContexts across async gaps

static Map absenceCancelResponse = { 0: "Absence Request Canceled Successfully", 1: "Error Cancelling Absence Request", }; — Arslan, Aug 29 '22 at 11:21
I mean please update you question and add the full code inside StatusCodes(). — eamirho3ein, Aug 29 '22 at 11:23
i add the Status code class and code init. status code is the code we recieved from server. Everything working fine only i want to get rid of this annoying yellow line (i am using intelliJ idea) — Arslan, Aug 29 '22 at 11:34
Present the code before and after you run the code `showSnackbar(...)` — Robert Sandberg, Aug 29 '22 at 12:06

Robert Sandberg · Accepted Answer · 2023-02-09T21:28:20.190

This has been answered a numerous times here. Just search for it: https://stackoverflow.com/search?q=BuildContexts+across+async+gaps

In short. Use a StatefulWidget. Before the warning, check if the widget is mounted. Do this using if (mounted) { ... } Put the lines where you get the warning inside the curly brackets { }

Update with Flutter 3.7.0

A StatefulWidget is no longer necessary. In a StatelessWidget you can now use context.mounted

score -1 · Answer 2 · answered Aug 29 '22 at 11:08

-1

You need to call code with .then(){}, Which you are using after async code in app.

For ex.,

await provider.getData().then(){
 Navigator.of(context).push(MaterialPageRoute(builder: (context) => SecondScreen()));
}

answered Aug 29 '22 at 11:08

Renik Shiroya

324
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how to solve BuildContexts across async gaps error flutter

2 Answers2

Update with Flutter 3.7.0

Linked