Flutter 异常上报

一、try cacth 可以捕获同步异常，使用catchError捕获异步异常

//使用try-catch捕获同步异常
try {
  throw StateError('This is a Dart exception.');
}
catch(e) {
  print(e);
}

//使用catchError捕获异步异常
Future.delayed(Duration(seconds: 1))
    .then((e) => throw StateError('This is a Dart exception in Future.'))
    .catchError((e)=>print(e));
    
//注意，以下代码无法捕获异步异常
try {
  Future.delayed(Duration(seconds: 1))
      .then((e) => throw StateError('This is a Dart exception in Future.'))
}
catch(e) {
  print("This line will never be executed. ");
}

二、不论是同步异常还是异步异常我们都可以使用Zone捕获到

runZoned(() {
  //同步抛出异常
  throw StateError('This is a Dart exception.');
}, onError: (dynamic e, StackTrace stack) {
  print('Sync error caught by zone');
});

runZoned(() {
  //异步抛出异常
  Future.delayed(Duration(seconds: 1))
      .then((e) => throw StateError('This is a Dart exception in Future.'));
}, onError: (dynamic e, StackTrace stack) {
  print('Async error aught by zone');
});

三、framework层的异常，系统会提供给FlutterError类，所以我们可以把这个错误统一交个zone去处理

FlutterError.onError = (FlutterErrorDetails details) async {
  //转发至Zone中
  Zone.current.handleUncaughtError(details.exception, details.stack);
};

runZoned<Future<Null>>(() async {
  runApp(MyApp());
}, onError: (error, stackTrace) async {
 //Do sth for error
});

可以自己通过文件去上报，也可以使用bugly去上报