flutter 警告Try rewriting the code to not reference the 'BuildContext'.

Sure, here's an example of how you can rewrite your code to avoid referencing the 'BuildContext':

Before:

void showAlertDialog(BuildContext context) {
  showDialog(
    context: context,
    builder: (BuildContext context) {
      return AlertDialog(
        title: Text('Alert'),
        content: Text('This is an alert dialog.'),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text('Close'),
          ),
        ],
      );
    },
  );
}

After:

void showAlertDialog(BuildContext context) {
  showDialog(
    context: context,
    builder: (_) {
      return AlertDialog(
        title: Text('Alert'),
        content: Text('This is an alert dialog.'),
        actions: [
          TextButton(
            onPressed: () => Navigator.of(context).pop(),
            child: Text('Close'),
          ),
        ],
      );
    },
  );
}

In the second example, we use a single underscore `_` as the parameter name instead of `BuildContext context`. This is because we don't actually use the `BuildContext` parameter in the builder function. By using `_`, we indicate that the parameter is not used. This makes the code clearer and avoids the warning message.