Flutter 崩溃收集

一、flutter 崩溃收集的方式

1、通用方式

use a try/catch block

2、捕捉async异常

1）try/catch

Future main() async {
  var dir = new Directory('/tmp');

  try {
    var dirList = dir.list();
    await for (FileSystemEntity f in dirList) {
      if (f is File) {
        print('Found file ${f.path}');
      } else if (f is Directory) {
        print('Found dir ${f.path}');
      }
    }
  } catch (e) {
    print(e.toString());
  }
}

2）使用 Future API

myFunc()
  .then((value) {
    doSomethingWith(value);
    ...
    throw("some arbitrary error");
  })
  .catchError(handleError);

3）async异常与 Future 的更多信息

Futures and Error Handling
Asynchronous Programming: Futures
dart:async library

3、使用 runZoned

// This creates a [Zone] that contains the Flutter application and stablishes
// an error handler that captures errors and reports them.
//
// Using a zone makes sure that as many errors as possible are captured,
// including those thrown from [Timer]s, microtasks, I/O, and those forwarded
// from the `FlutterError` handler.
//
// More about zones:
//
// - https://api.dartlang.org/stable/1.24.2/dart-async/Zone-class.html
// - Zones
runZoned<Future<Null>>(() async {
  runApp(new CrashyApp());
}, onError-: (error, stackTrace) async {
  await _reportError(error, stackTrace);
});

4、使用 FlutterError.onError

FlutterError.onError is only about reporting flutter framework errors (errors that are caught by the framework typically during a frame).

// This captures errors reported by the Flutter framework.
FlutterError.onError = (FlutterErrorDetails details) async {
  if (isInDebugMode) {
    // In development mode simply print to console.
    FlutterError.dumpErrorToConsole(details);
  } else {
    // In production mode report to the application zone
    // 重定向到 3中的 runZone 中处理
    Zone.current.handleUncaughtError(details.exception, details.stack);
  }
};

5、使用 Isolate.current.addErrorListener

use Isolate.current.addErrorListener to capture uncaught errors in the root zone.

Isolate.current.addErrorListener(new RawReceivePort((dynamic pair) async {
  print('Isolate.current.addErrorListener caught an error');
  await _reportError(
    (pair as List<String>).first,
    (pair as List<String>).last,
  );
}).sendPort);

二、Flutter异常收集最佳实践

Future<Null> main() async {
  FlutterError.onError = (FlutterErrorDetails details) async {
    if (isInDebugMode) {
      FlutterError.dumpErrorToConsole(details);
    } else {
      Zone.current.handleUncaughtError(details.exception, details.stack);
    }
  };

  runZoned<Future<Null>>(() async {
    runApp(new HomeApp());
  }, onError-: (error, stackTrace) async {
    await _reportError(error, stackTrace);
  });
}

三、Flutter crash 收集平台

1、Sentry

1）商业Sentry服务器

Sentry | Error Tracking Software — JavaScript, Python, PHP, Ruby, more

Sentry官方的服务是收费的，使用天数只有13天左右，过期后不付费的话：只保存1w个事件，没有成员功能。

2）flutter官方支持

Sentry flutter package：https://pub.dartlang.org/packages/sentry

github: flutter/sentry

demo: flutter/crashy 、 yjbanov/crashy

3）总结

优点：有了 flutter package ，flutter 接入 Sentry，非常简单。

缺点：免费版限制多。

2、Crashlytics （--> fabric --> Firebase）

1）flutter 官方支持的计划

Please add support for Crashlytics

2）非官方flutter插件

https://github.com/kiwi-bop/flutter_crashlytics

https://pub.dartlang.org/packages/flutter_crashlytics

3）总结

优点：Google旗下，免费！

缺点：目前flutter官方尚未有对应package/plugin，使用 flutter_crashlytics 对接比较麻烦。

注意：2019年中，fabric 服务将关闭，一律迁移至 Firebase。这个动作与微软的 hockeyapp 很像。