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myErrorsHandler.onErrorDetails(details);
};
PlatformDispatcher.instance.onError = (error, stack) {
myErrorsHandler.onError(error, stack);
return true;
};
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
widget build(BuildContext context) {
return MaterialApp(
builder: (context, widget) {
widget error = const text('...rendering error...');
if (widget is scaffold || widget is navigator) {
error = scaffold(body: center(child: error));
}
ErrorWidget.builder = (errordetails) => error;
if (widget != null) return widget;
throw StateError('widget is null');
},
);
}
}
<code_end>
<topic_end>
<topic_start>
report errors to a service
while one always tries to create apps that are free of bugs,
they’re sure to crop up from time to time.
since buggy apps lead to unhappy users and customers,
it’s important to understand how often your users
experience bugs and where those bugs occur.
that way, you can prioritize the bugs with the
highest impact and work to fix them.
how can you determine how often your users experiences bugs?
whenever an error occurs, create a report containing the
error that occurred and the associated stacktrace.
you can then send the report to an error tracking
service, such as bugsnag, datadog,
firebase crashlytics, rollbar, or sentry.
the error tracking service aggregates all of the crashes your users
experience and groups them together. this allows you to know how often your
app fails and where the users run into trouble.
in this recipe, learn how to report errors to the
sentry crash reporting service using
the following steps:
<topic_end>
<topic_start>
1. get a DSN from sentry
before reporting errors to sentry, you need a “dsn” to uniquely identify
your app with the sentry.io service.
to get a DSN, use the following steps:
<topic_end>
<topic_start>
2. import the sentry package
import the sentry_flutter package into the app.
the sentry package makes it easier to send
error reports to the sentry error tracking service.
to add the sentry_flutter package as a dependency,
run flutter pub add:
<topic_end>
<topic_start>
3. initialize the sentry SDK
initialize the SDK to capture different unhandled errors automatically:
<code_start>
import 'package:flutter/widgets.dart';
import 'package:sentry_flutter/sentry_flutter.dart';
future<void> main() async {
await SentryFlutter.init(
(options) => options.dsn = 'https://example@sentry.io/example',
appRunner: () => runApp(const MyApp()),
);
}
<code_end>
alternatively, you can pass the DSN to flutter using the dart-define tag:
<topic_end>
<topic_start>
what does that give me?
this is all you need for sentry to capture unhandled errors in dart and native layers.
this includes swift, Objective-C, c, and c++ on iOS, and java, kotlin, c, and c++ on android.
<topic_end>
<topic_start>
4. capture errors programmatically
besides the automatic error reporting that sentry generates by
importing and initializing the SDK,
you can use the API to report errors to sentry:
<code_start>
await Sentry.captureException(exception, stackTrace: stackTrace);
<code_end>
for more information, see the sentry API docs on pub.dev.
<topic_end>
<topic_start>
learn more
extensive documentation about using the sentry SDK can be found on sentry’s site.
<topic_end>
<topic_start>
complete example
to view a working example,