example能跑起来？

[lh9403]

自己的项目pub安装完导入使用就报错，example也跑不起来

[busyboy1991]

##这个问题何解啊，自己的工程和demo都报类似的错误

../lib/jpush_flutter.dart:29:12: Error: The parameter 'appKey' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. String appKey,
^^^^^^
../lib/jpush_flutter.dart:30:10: Error: The parameter 'production' can't have a value of 'null' because of its type 'bool', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. bool production,
^^^^^^^^^^
../lib/jpush_flutter.dart:48:18: Error: The parameter 'onReceiveNotification' can't have a value of 'null' because of its type 'Future Function(Map<String, dynamic>)', but the implicit default value is 'null'.

• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  Try adding either an explicit non-'null' default value or the 'required' modifier. EventHandler onReceiveNotification,
  ^^^^^^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:49:18: Error: The parameter 'onOpenNotification' can't have a value of 'null' because of its type 'Future Function(Map<String, dynamic>)', but the implicit default value is 'null'.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  Try adding either an explicit non-'null' default value or the 'required' modifier. EventHandler onOpenNotification,
  ^^^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:50:18: Error: The parameter 'onReceiveMessage' can't have a value of 'null' because of its type 'Future Function(Map<String, dynamic>)', but the implicit default value is 'null'.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  Try adding either an explicit non-'null' default value or the 'required' modifier. EventHandler onReceiveMessage,
  ^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:51:18: Error: The parameter 'onReceiveNotificationAuthorization' can't have a value of 'null' because of its type 'Future Function(Map<String, dynamic>)', but the implicit default value is 'null'.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  Try adding either an explicit non-'null' default value or the 'required' modifier. EventHandler onReceiveNotificationAuthorization,
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:242:41: Error: The parameter 'notificationId' can't have a value of 'null' because of its type 'int', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. void clearNotification({@required int notificationId}) {
  ^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:341:23: Error: The parameter 'id' can't have a value of 'null' because of its type 'int', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. {@required this.id,
  ^^
  ../lib/jpush_flutter.dart:342:22: Error: The parameter 'title' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. @required this.title,
  ^^^^^
  ../lib/jpush_flutter.dart:343:22: Error: The parameter 'content' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. @required this.content,
  ^^^^^^^
  ../lib/jpush_flutter.dart:344:22: Error: The parameter 'fireTime' can't have a value of 'null' because of its type 'DateTime', but the implicit default value is 'null'.
• 'DateTime' is from 'dart:core'.
  Try adding either an explicit non-'null' default value or the 'required' modifier. @required this.fireTime,
  ^^^^^^^^
  ../lib/jpush_flutter.dart:345:12: Error: The parameter 'buildId' can't have a value of 'null' because of its type 'int', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. this.buildId,
  ^^^^^^^
  ../lib/jpush_flutter.dart:346:12: Error: The parameter 'extra' can't have a value of 'null' because of its type 'Map<String, String>', but the implicit default value is 'null'.
• 'Map' is from 'dart:core'.
  Try adding either an explicit non-'null' default value or the 'required' modifier. this.extra,
  ^^^^^
  ../lib/jpush_flutter.dart:348:12: Error: The parameter 'soundName' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. this.soundName,
  ^^^^^^^^^
  ../lib/jpush_flutter.dart:349:12: Error: The parameter 'subtitle' can't have a value of 'null' because of its type 'String', but the implicit default value is 'null'. Try adding either an explicit non-'null' default value or the 'required' modifier. this.subtitle})
  ^^^^^^^^
  ../lib/jpush_flutter.dart:67:54: Error: A value of type 'Future' can't be returned from an async function with return type 'Future<Null>'.
• 'Future' is from 'dart:async'.
  return _onReceiveNotification(call.arguments.cast<String, dynamic>()); ^
  ../lib/jpush_flutter.dart:69:51: Error: A value of type 'Future' can't be returned from an async function with return type 'Future<Null>'.
• 'Future' is from 'dart:async'.
  return _onOpenNotification(call.arguments.cast<String, dynamic>()); ^
  ../lib/jpush_flutter.dart:71:49: Error: A value of type 'Future' can't be returned from an async function with return type 'Future<Null>'.
• 'Future' is from 'dart:async'.
  return _onReceiveMessage(call.arguments.cast<String, dynamic>()); ^
  ../lib/jpush_flutter.dart:73:67: Error: A value of type 'Future' can't be returned from an async function with return type 'Future<Null>'.
• 'Future' is from 'dart:async'.
  return _onReceiveNotificationAuthorization(call.arguments.cast<String, dynamic>()); ^
  ../lib/jpush_flutter.dart:23:16: Error: Field '_onReceiveNotification' should be initialized because its type 'Future Function(Map<String, dynamic>)' doesn't allow null.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  EventHandler _onReceiveNotification;
  ^^^^^^^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:24:16: Error: Field '_onOpenNotification' should be initialized because its type 'Future Function(Map<String, dynamic>)' doesn't allow null.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  EventHandler _onOpenNotification;
  ^^^^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:25:16: Error: Field '_onReceiveMessage' should be initialized because its type 'Future Function(Map<String, dynamic>)' doesn't allow null.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  EventHandler _onReceiveMessage;
  ^^^^^^^^^^^^^^^^^
  ../lib/jpush_flutter.dart:26:16: Error: Field '_onReceiveNotificationAuthorization' should be initialized because its type 'Future Function(Map<String, dynamic>)' doesn't allow null.
• 'Future' is from 'dart:async'.
• 'Map' is from 'dart:core'.
  EventHandler _onReceiveNotificationAuthorization;
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[skill20]

2.0.9 修改了。