Needs to be updated for Dart 2 Compatibility

needs to be updated to dart 2 preview. https://groups.google.com/forum/#!topic/flutter-dev/H8dDhWg_c8I

Steps to Reproduce

Integrated https://github.com/evrone/flutter_audio with an app for a few months. Was working until recently. Now throws

2018-05-01 10:17:34.794099-0700 Runner[52813:1608248] flutter: type '(Map<String, dynamic>) => void' is not a subtype of type '(dynamic) => void'

Logs

Run your application with flutter run and attach all the log output. 2018-05-01 10:17:34.627949-0700 Runner[52813:1608279] flutter: Observatory listening on http://127.0.0.1:61887/ 2018-05-01 10:17:34.786834-0700 Runner[52813:1608248] flutter: ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════ 2018-05-01 10:17:34.793689-0700 Runner[52813:1608248] flutter: The following assertion was thrown attaching to the render tree: 2018-05-01 10:17:34.794099-0700 Runner[52813:1608248] flutter: type ‘(Map<String, dynamic>) => void’ is not a subtype of type ‘(dynamic) => void’ 2018-05-01 10:17:34.803361-0700 Runner[52813:1608248] flutter: 2018-05-01 10:17:34.803674-0700 Runner[52813:1608248] flutter: Either the assertion indicates an error in the framework itself, or we should provide substantially 2018-05-01 10:17:34.804658-0700 Runner[52813:1608248] flutter: more information in this error message to help you determine and fix the underlying cause. 2018-05-01 10:17:34.804950-0700 Runner[52813:1608248] flutter: In either case, please report this assertion by filing a bug on GitHub: 2018-05-01 10:17:34.805849-0700 Runner[52813:1608248] flutter: https://github.com/flutter/flutter/issues/new 2018-05-01 10:17:34.806535-0700 Runner[52813:1608248] flutter: 2018-05-01 10:17:34.806868-0700 Runner[52813:1608248] flutter: When the exception was thrown, this was the stack: 2018-05-01 10:17:34.811722-0700 Runner[52813:1608248] flutter: #0 new MedcorderAudio (package:medcorder_audio/medcorder_audio.dart:16:50) 2018-05-01 10:17:34.812700-0700 Runner[52813:1608248] flutter: #1 new _MyAppState (file:///Users/jeanpaul/Dev/flutter_audio/example/lib/main.dart:17:36) 2018-05-01 10:17:34.813265-0700 Runner[52813:1608248] flutter: #2 MyApp.createState (file:///Users/jeanpaul/Dev/flutter_audio/example/lib/main.dart:12:36) 2018-05-01 10:17:34.813675-0700 Runner[52813:1608248] flutter: #3 new StatefulElement (package:flutter/src/widgets/framework.dart:3702:23) 2018-05-01 10:17:34.813951-0700 Runner[52813:1608248] flutter: #4 StatefulWidget.createElement (package:flutter/src/widgets/framework.dart:781:42) 2018-05-01 10:17:34.814354-0700 Runner[52813:1608248] flutter: #5 Element.inflateWidget (package:flutter/src/widgets/framework.dart:2897:40) 2018-05-01 10:17:34.814503-0700 Runner[52813:1608248] flutter: #6 Element.updateChild (package:flutter/src/widgets/framework.dart:2702:12) 2018-05-01 10:17:34.815057-0700 Runner[52813:1608248] flutter: #7 RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:857:16) 2018-05-01 10:17:34.815264-0700 Runner[52813:1608248] flutter: #8 RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:828:5) 2018-05-01 10:17:34.815461-0700 Runner[52813:1608248] flutter: #9 RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:774:17) 2018-05-01 10:17:34.815602-0700 Runner[52813:1608248] flutter: #10 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2214:19) 2018-05-01 10:17:34.815924-0700 Runner[52813:1608248] flutter: #11 RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:773:13) 2018-05-01 10:17:34.816070-0700 Runner[52813:1608248] flutter: #12 _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&RendererBinding&WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:662:7) 2018-05-01 10:17:34.816395-0700 Runner[52813:1608248] flutter: #13 runApp (package:flutter/src/widgets/binding.dart:704:7) 2018-05-01 10:17:34.816566-0700 Runner[52813:1608248] flutter: #14 main (file:///Users/jeanpaul/Dev/flutter_audio/example/lib/main.dart:7:3) 2018-05-01 10:17:34.817113-0700 Runner[52813:1608248] flutter: #15 _startIsolate.<anonymous closure> (dart:isolate/runtime/libisolate_patch.dart:279:19) 2018-05-01 10:17:34.817693-0700 Runner[52813:1608248] flutter: #16 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:165:12) 2018-05-01 10:17:34.818300-0700 Runner[52813:1608248] flutter: ════════════════════════════════════════════════════════════════════════════════════════════════════ Run flutter analyze and attach any output of that command also.

Flutter Doctor

144:example jeanpaul$ flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel beta, v0.3.1, on Mac OS X 10.13.4 17E199, locale en-US) [✓] Android toolchain - develop for Android devices (Android SDK 27.0.3) [✓] iOS toolchain - develop for iOS devices (Xcode 9.3) [✓] Android Studio (version 3.1) [✓] VS Code (version 1.22.2) [✓] Connected devices (3 available)

For more information about diagnosing and reporting Flutter bugs, please see https://flutter.io/bug-reports/.

[jeanpaulcozzatti]

i forked, and have it working for dart2: https://github.com/jeanpaulcozzatti/flutter_audio

[jeanpaulcozzatti]

I’m still using -no-preview-dart-2.

I just wrote my first plugin, so let me see if I can write a patch for this.

Sent from Astro https://www.helloastro.com for Mac

On Jun 5, 2018 at 2:23 PM, Andrew Takao [e-mail] wrote:

I’m also having this issue, and when I do flutter run -no-preview-dart-2 I run into other issues

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