Question

关闭应用后，我需要通过“隔离”从后台进程发送通知但我有错误在不使用预定通知的情况下该怎么办，因为我需要执行特定的代码注意：如果此代码无法运行，请以其他方式建议我

import [...]
void main() {..}
class MyApp extends StatefulWidget {...}

class _MyAppState extends State<MyApp> {
  static FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin;

  void callerCreateIsolate() async {
    await Isolate.spawn(
      echo,
      '',
    );
  }


  static void echo(String s)  {
    print('isolate');
   showNotification();
  }

  static Future onSelectNotification(String payload) {
    debugPrint("payload : $payload");
    showDialog(
      builder: (_) =>
      new AlertDialog(
        title: new Text('Notification'),
        content: new Text('$payload'),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: new AppBar(
        title: new Text('Flutter Local Notification'),
      ),
      body: new Center(
          child: Column(
            children: <Widget>[
              new RaisedButton(
                onPressed: callerCreateIsolate,
                child: new Text(
                  'Isolate',
                  style: Theme
                      .of(context)
                      .textTheme
                      .headline,
                ),
              ),
            ],
          )),
    );
  }

  static showNotification() async {
    print('showNotification');
    flutterLocalNotificationsPlugin = new FlutterLocalNotificationsPlugin();
    var _android = new AndroidInitializationSettings('bigbenicon');
    var _iOS = new IOSInitializationSettings();
    var initSetttings = new InitializationSettings(_android, _iOS);
    flutterLocalNotificationsPlugin.initialize(initSetttings,
        onSelectNotification: onSelectNotification);

    var android = new AndroidNotificationDetails(
      'channel id', 'channel NAME', 'CHANNEL DESCRIPTION',
      priority: Priority.High, importance: Importance.Max,

    );
    var iOS = new IOSNotificationDetails();
    var platform = new NotificationDetails(android, iOS);
    await flutterLocalNotificationsPlugin.show(0, 'title', 'body', platform,
        payload: 'closed');
  }

}

D / ViewRootImpl @ dbbebd7MainActivity：ViewPostIme指针0 D / ViewRootImpl @ dbbebd7MainActivity：ViewPostIme指针1 I / flutter（ 1863）：隔离I / flutter（1863）：showNotification E / flutter（1863）： [错误：flutter / runtime / dart_isolate.cc（805）]未处理的异常： E / flutter（1863）：错误：本机函数'Window_sendPlatformMessage' 无法找到（4个参数）E / flutter（1863）：＃0 Window.sendPlatformMessage（dart：ui / window.dart：1088：9）E / flutter（ 1863）：＃1 _DefaultBinaryMessenger._sendPlatformMessage （package：flutter / src / services / binary_messenger.dart：85：15）E / flutter（ 1863）：＃2 _DefaultBinaryMessenger.send （package：flutter / src / services / binary_messenger.dart：129：12）E / flutter （1863）：＃3 MethodChannel.invokeMethod （package：flutter / src / services / platform_channel.dart：309：51）E / flutter （1863年）：E / flutter（1863年）：＃4 FlutterLocalNotificationsPlugin.initialize （package：flutter_local_notifications / src / flutter_local_notifications.dart：103：24） E / flutter（1863）：E / flutter（1863）：＃5 _MyAppState.showNotification （包装：big_ben / main.dart：74：37）E / flutter（1863）：E / flutter（ 1863）：＃6 _MyAppState.echo（package：big_ben / main.dart：29：4）E / flutter （1863）：＃7 _startIsolate。（dart：isolate-patch / isolate_patch.dart：304：17）E / flutter（1863）：＃8 _RawReceivePortImpl._handleMessage（dart：isolate-patch / isolate_patch.dart：172：12）

从隔离发送通知

0 个答案: