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error dialog if the barcode cannot be converted to JSON!

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This commit is contained in:
Oliver Walters 2020-04-14 23:11:30 +10:00
parent 200d2edc9a
commit d0f1a4d4ce
2 changed files with 28 additions and 1 deletions
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10
lib/barcode.dart
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@ -21,8 +21,16 @@ Future<void> scanQrCode(BuildContext context) async {
print("Scanned: $result");
Map<String, dynamic> data;
// Look for JSON data in the result...
final data = json.decode(result);
try {
data = json.decode(result);
} on FormatException {
showErrorDialog(context, "Bad barcode data", result);
return;
}
showProgressDialog(context, "Querying Server", "Sending barcode data to server");

19
lib/widget/dialogs.dart
View File

@ -1,6 +1,25 @@
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
void showErrorDialog(BuildContext context, String title, String description) {
showDialog(
context: context,
child: SimpleDialog(
title: ListTile(
title: Text("Error"),
leading: FaIcon(FontAwesomeIcons.exclamationCircle),
),
children: <Widget>[
ListTile(
title: Text(title),
subtitle: Text(description)
)
]
)
);
}
void showProgressDialog(BuildContext context, String title, String description) {
showDialog(