flutter/dart: Do not use BuildContexts across async gaps in provider model class

Question

In the provider model I use context after await It shows warning Do not use BuildContexts across async gaps and I am unable to check with mounted because I use it in Provider class. so what I should do to remove this warning? Any help would be appreciated thanks.

class SoloStartSiteScanningProvider extends ChangeNotifier {
  FocusNode boxFocusNode = FocusNode();
  FocusNode locationFocusNode = FocusNode();
  Future checkBoxSealMatching(BuildContext context) async {
    try {    
      var barcode = await _scanBoxBarcode();
      if (barcode != "-1") {
        if (boxFieldController.text == barcode) {
          // Do not use BuildContexts across async gaps
          FocusScope.of(context).requestFocus(locationFocusNode);
        }
      }
    } catch (e) {
      print(" coll lactaion scanning Exception=== $e");
    }
  }
}

Does this answer your question? Do not use BuildContexts across async gaps — Georgina
– Georgina, Commented Dec 9, 2022 at 17:35

Ruble · Accepted Answer · 2022-12-09 18:33:47Z

1

Try like this 😅:

Future checkBoxSealMatching(BuildContext context) async {
final focusScope = FocusScope.of(context);
FocusNode boxFocusNode = FocusNode();
...
        if (boxFieldController.text == barcode) {
          focusScope.requestFocus(locationFocusNode);
        }
}

answered Dec 9, 2022 at 18:33

Ruble

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3 Comments

Abdullah Over a year ago

Thanks a lot for your answer and this is also the right answer for many other situations

Abdullah Over a year ago

what we can do In this scenario if you have any idea plz : Future checkBoxSealMatching(BuildContext context) async { final focusScope = FocusScope.of(context); if (boxFieldController.text == barcode) { getTeam(context); // Do not use BuildContexts across async gaps } }

Ruble Over a year ago

Get it right at the beginning something like this final teamFuture = getTeam(context);. When necessary, just wait for the future final team = await teamFuture;

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