如何解决Flutter 工作管理器返回“工作结果失败 [id=XXXXXxXXXXxXXXX tags={ be.tramckrijte.workmanager.BackgroundWorker }]”
我正在构建一个应用程序,通知用户祈祷时间。我正在使用 adhan 包来计算时间并将其保存在共享首选项中。由于祈祷时间每 24 小时更改一次,因此我使用 workmanager 获取该特定时间的祈祷时间,并每 20 小时将其保存在共享偏好中。但是我正面临这个问题,有没有其他或更好的方法可以实现这一点。
audioRef.current.volume // use this where you want
main.dart
Launching lib/main.dart on ASUS X00T in debug mode...
✓ Built build/app/outputs/Flutter-apk/app-debug.apk.
Connecting to VM Service at ws://127.0.0.1:44753/d5gE32RyvC4=/ws
I/.example.notif(14281): Waiting for a blocking GC ProfileSaver
E/Flutter (14281): [ERROR:Flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: Invalid argument(s) (input): Must not be null
[38;5;244mE/Flutter (14281): #0 _RegExp.firstMatch (dart:core-patch/regexp_patch.dart:221:24)[39;49m
[38;5;244mE/Flutter (14281): #1 DateTime.parse (dart:core/date_time.dart:266:23)[39;49m
[38;5;248mE/Flutter (14281): #2 PrayerTime.getFajr[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;248mE/Flutter (14281): #3 _GetPrayersPageState.loalData[39;49m
E/Flutter (14281): <asynchronous suspension>
E/Flutter (14281):
E/cutils-trace(14281): Error opening trace file: No such file or directory (2)
I/Flutter (14281): getAndSavePrayerscallbackdispatcher
I/Flutter (14281): 2021-03-25 13:07:32.419749+0530
I/Flutter (14281): 2021-03-25 12:45:00.000+0530
I/Flutter (14281): 2021-03-25 20:04:00.000+0530
I/Flutter (14281): 2021-03-25 17:08:00.000+0530
I/Flutter (14281): 2021-03-25 20:04:00.000+0530
E/Flutter (14281): [ERROR:Flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The method 'zonedSchedule' was called on null.
E/Flutter (14281): Receiver: null
E/Flutter (14281): Tried calling: zonedSchedule(0,"Title","Body",Instance of 'TZDateTime',Instance of 'NotificationDetails',androidAllowWhileIdle: true,uilocalnotificationDateInterpretation: Instance of 'UIlocalnotificationDateInterpretation')
[38;5;244mE/Flutter (14281): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)[39;49m
[38;5;248mE/Flutter (14281): #1 notificationmanager.zonednotification.<anonymous closure>[39;49m
[38;5;248mE/Flutter (14281): #2 notificationmanager.zonednotification.<anonymous closure>[39;49m
[38;5;244mE/Flutter (14281): #3 List.forEach (dart:core-patch/growable_array.dart:403:8)[39;49m
[38;5;248mE/Flutter (14281): #4 notificationmanager.zonednotification[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;248mE/Flutter (14281): #5 callbackdispatcher.<anonymous closure>[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;244mE/Flutter (14281): #6 MethodChannel._handleAsMethodCall[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;244mE/Flutter (14281): #7 _DefaultBinaryMessenger.handlePlatformMessage[39;49m
E/Flutter (14281): <asynchronous suspension>
E/Flutter (14281):
I/chatty (14281): uid=10412(com.example.notify) 2.ui identical 3 lines
E/Flutter (14281): [ERROR:Flutter/lib/ui/ui_dart_state.cc(186)] Unhandled Exception: NoSuchMethodError: The method 'zonedSchedule' was called on null.
E/Flutter (14281): Receiver: null
E/Flutter (14281): Tried calling: zonedSchedule(0,uilocalnotificationDateInterpretation: Instance of 'UIlocalnotificationDateInterpretation')
[38;5;244mE/Flutter (14281): #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:54:5)[39;49m
[38;5;248mE/Flutter (14281): #1 notificationmanager.zonednotification.<anonymous closure>[39;49m
[38;5;248mE/Flutter (14281): #2 notificationmanager.zonednotification.<anonymous closure>[39;49m
[38;5;244mE/Flutter (14281): #3 List.forEach (dart:core-patch/growable_array.dart:403:8)[39;49m
[38;5;248mE/Flutter (14281): #4 notificationmanager.zonednotification[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;248mE/Flutter (14281): #5 callbackdispatcher.<anonymous closure>[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;244mE/Flutter (14281): #6 MethodChannel._handleAsMethodCall[39;49m
E/Flutter (14281): <asynchronous suspension>
[38;5;244mE/Flutter (14281): #7 _DefaultBinaryMessenger.handlePlatformMessage[39;49m
E/Flutter (14281): <asynchronous suspension>
E/Flutter (14281):
I/WM-WorkerWrapper(14281): Worker result FAILURE for Work [ id=0a8091e2-1677-4fc9-9fbd-79468e004d97,tags={ be.tramckrijte.workmanager.BackgroundWorker } ]
pray_times.dart
import 'dart:async';
import 'package:Flutter/material.dart';
import 'package:notify/local_notification/manage_notification.dart';
import 'package:notify/prayer_times.dart';
import 'package:workmanager/workmanager.dart';
import 'package:timezone/timezone.dart' as tz;
const String uniqueName = "getPrayers";
const String taskName = "getAndSavePrayers";
void main() {
WidgetsFlutterBinding.ensureInitialized();
Workmanager.initialize(callbackdispatcher,isInDebugMode: true);
Workmanager.registerPeriodicTask(uniqueName,taskName,initialDelay: Duration(minutes: 1),frequency: Duration(hours: 20),constraints: Constraints(
networkType: NetworkType.not_required,requiresBatteryNotLow: false,requiresCharging: false,requiresdeviceidle: false,requiresstorageNotLow: false));
runApp(MyApp());
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'GetPrayer',theme: ThemeData(
brightness: Brightness.dark,primarySwatch: Colors.cyan,),home: GetPrayersPage(),);
}
}
class GetPrayersPage extends StatefulWidget {
@override
_GetPrayersPageState createState() => _GetPrayersPageState();
}
class _GetPrayersPageState extends State<GetPrayersPage> {
tz.TZDateTime fajr;
tz.TZDateTime dhuhr;
tz.TZDateTime maghrib;
tz.TZDateTime asr;
tz.TZDateTime isha;
@override
void initState() {
super.initState();
loalData();
}
void loalData() async {
fajr = await PrayerTime.instance.getFajr();
dhuhr = await PrayerTime.instance.getdhuhr();
maghrib = await PrayerTime.instance.getmaghrib();
asr = await PrayerTime.instance.getasr();
isha = await PrayerTime.instance.getisha();
setState(() {});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('Prayer times'),elevation: 0.0,body: Column(
mainAxisSize: MainAxisSize.min,children: [
ListTile(
leading: Icon(Icons.calendar_today),title: Text("Fajr"),trailing: Text("${fajr.toString()}"),ListTile(
leading: Icon(Icons.calendar_today),title: Text("Dhuhr"),trailing: Text("${dhuhr.toString()}"),title: Text("Maghrib"),trailing: Text("${maghrib.toString()}"),title: Text("Asr"),trailing: Text("${asr.toString()}"),title: Text("Isha"),trailing: Text("${isha.toString()}"),],bottomNavigationBar: Container(
child: ElevatedButton(
style: ButtonStyle(
minimumSize:
MaterialStateProperty.all(Size(double.infinity,60))),onpressed: () {
PrayerTime.instance.getPrayers();
},child: Text("UPDATE"),);
}
}
void callbackdispatcher() {
Workmanager.executeTask((task,inputData) async {
switch (task) {
case taskName:
PrayerTime.instance.getPrayers();
await notificationmanager().initnotificationmanager();
await notificationmanager().zonednotification();
await notificationmanager().showNotification();
break;
}
return Future.value(true);
});
print(taskName + "callbackdispatcher");
}
manage_notification.dart
import 'package:adhan/adhan.dart';
import 'package:notify/local_notification/get_timezone_date.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:timezone/timezone.dart' as tz;
class PrayerTime {
static const String fajrKey = "fajr";
static const String sunriseKey = "sunrise";
static const String dhuhrKey = "dhuhr";
static const String asrKey = "asr";
static const String maghribKey = "maghrib";
static const String ishaKey = "maghrib";
PrayerTime._privateConstructor();
static final PrayerTime _instance = PrayerTime._privateConstructor();
static PrayerTime get instance => _instance;
List<String> prayerTimesList = [];
void getPrayers() async {
final myCoordinates = Coordinates(19.076090,72.877426);
final params = CalculationMethod.karachi.getParameters();
params.madhab = Madhab.hanafi;
final prayerTimes = PrayerTimes.today(myCoordinates,params);
final datewa = DateTime.Now().add(Duration(minutes: 5));
String _formatTime(DateTime time) {
return time.toIso8601String();
}
savePrayers(
fajr: _formatTime(datewa),// fajr: _formatTime(prayerTimes.fajr),dhuhr: _formatTime(prayerTimes.dhuhr),asr: _formatTime(prayerTimes.asr),maghrib: _formatTime(prayerTimes.maghrib),isha: _formatTime(prayerTimes.isha),);
}
void savePrayers({
String fajr,String dhuhr,String asr,String maghrib,String isha,}) async {
SharedPreferences prefs = await SharedPreferences.getInstance();
await prefs.setString(fajrKey,fajr);
await prefs.setString(dhuhrKey,dhuhr);
await prefs.setString(asrKey,asr);
await prefs.setString(maghribKey,maghrib);
await prefs.setString(ishaKey,isha);
}
Future<tz.TZDateTime> getFajr() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
return convertToTZ(DateTime.parse(prefs.getString(fajrKey)));
}
Future<tz.TZDateTime> getdhuhr() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
return convertToTZ(DateTime.parse(prefs.getString(dhuhrKey)));
}
Future<tz.TZDateTime> getasr() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
return convertToTZ(DateTime.parse(prefs.getString(asrKey)));
}
Future<tz.TZDateTime> getmaghrib() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
return convertToTZ(DateTime.parse(prefs.getString(maghribKey)));
}
Future<tz.TZDateTime> getisha() async {
SharedPreferences prefs = await SharedPreferences.getInstance();
return convertToTZ(DateTime.parse(prefs.getString(ishaKey)));
}
}
get_timezone.dart
import 'dart:typed_data';
import 'package:Flutter/material.dart';
import 'package:Flutter_local_notifications/Flutter_local_notifications.dart';
import 'package:notify/prayer_times.dart';
import 'package:timezone/timezone.dart' as tz;
class notificationmanager {
FlutterlocalnotificationsPlugin FlutterlocalnotificationsPlugin;
AndroidInitializationSettings initializationSettingsAndroid;
IOSInitializationSettings initializationSettingsIOS;
InitializationSettings initializationSettings;
/// Initializing FlutterlocalnotificationsPlugin.
Future initnotificationmanager() async {
FlutterlocalnotificationsPlugin = FlutterlocalnotificationsPlugin();
initializationSettingsAndroid =
AndroidInitializationSettings('ic_launcher');
initializationSettingsIOS = IOSInitializationSettings();
initializationSettings = InitializationSettings(
android: initializationSettingsAndroid,iOS: initializationSettingsIOS);
await FlutterlocalnotificationsPlugin.initialize(initializationSettings);
}
Future<void> zonednotification() async {
/// List of prayer times.
List<tz.TZDateTime> _times = [
await PrayerTime.instance.getFajr(),await PrayerTime.instance.getdhuhr(),await PrayerTime.instance.getmaghrib(),await PrayerTime.instance.getasr(),await PrayerTime.instance.getisha(),];
/// Vibration pattern.
var vibrationPattern = Int64List(4);
vibrationPattern[0] = 0;
vibrationPattern[1] = 1000;
vibrationPattern[2] = 5000;
vibrationPattern[3] = 2000;
/// Android Specifics.
var androidplatformChannelSpecifics = AndroidNotificationDetails(
"0","channel Name","channel Description",icon: 'ic_launcher',sound: RawResourceAndroidNotificationSound("slow_spring_board"),largeIcon: DrawableResourceAndroidBitmap('ic_launcher'),vibrationPattern: vibrationPattern,autoCancel: false,enableLights: true,playSound: true,color: Colors.green,ledColor: const Color.fromARGB(255,255,0),ledOnMs: 1000,ledOffMs: 500);
/// iOS Specifics.
IOSNotificationDetails iOSPlatformChannelSpecifics =
IOSNotificationDetails(sound: 'slow_spring_board.aiff');
/// Platform channel specifics.
NotificationDetails platformChannelSpecifics = NotificationDetails(
android: androidplatformChannelSpecifics,iOS: iOSPlatformChannelSpecifics);
/// ZonedSchedule
_times.forEach((element) async {
await FlutterlocalnotificationsPlugin.zonedSchedule(
0,element,platformChannelSpecifics,uilocalnotificationDateInterpretation:
UIlocalnotificationDateInterpretation.absoluteTime,androidAllowWhileIdle: true);
});
}
Future<void> showNotification() async {
var androidplatformChannelSpecifics = AndroidNotificationDetails(
"1",'channel name','channel description',importance: Importance.high,priority: Priority.high,ticker: 'ticker');
var iOSPlatformChannelSpecifics = IOSNotificationDetails();
var platformChannelSpecifics = NotificationDetails(
android: androidplatformChannelSpecifics,iOS: iOSPlatformChannelSpecifics);
await FlutterlocalnotificationsPlugin.show(
0,'plain title','plain body',payload: 'item x');
}
}
颤动医生
import 'package:timezone/data/latest.dart';
import 'package:timezone/timezone.dart' as tz;
import 'package:Flutter_native_timezone/Flutter_native_timezone.dart';
class TimeZone {
factory TimeZone() => _this ?? TimeZone._();
TimeZone._() {
initializeTimeZones();
}
static TimeZone _this;
Future<String> getTimeZoneName() async =>
FlutterNativeTimezone.getLocalTimezone();
Future<tz.Location> getLocation([String timeZoneName]) async {
if (timeZoneName == null || timeZoneName.isEmpty) {
timeZoneName = await getTimeZoneName();
}
return tz.getLocation(timeZoneName);
}
}
Future<tz.TZDateTime> convertToTZ(dateTime) async {
final timeZone = TimeZone();
String timeZoneName = await timeZone.getTimeZoneName();
final location = await timeZone.getLocation(timeZoneName);
final scheduledDate = tz.TZDateTime.from(dateTime,location);
print(scheduledDate.toString());
return scheduledDate;
}
pubspec.yaml*
Doctor summary (to see all details,run Flutter doctor -v):
[✓] Flutter (Channel stable,2.0.1,on Linux,locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Chrome - develop for the web
[!] Android Studio (not installed)
[✓] VS Code (version 1.54.3)
[✓] Connected device (2 available)
! Doctor found issues in 1 category.
解决方法
在 try/catch 中调用您的代码并查看错误并在变量上创建您的实例:
try {
PrayerTime.instance.getPrayers();
NotificationManager manager = new NotificationManager();
await manager.initNotificationManager();
await manager.zonedNotification();
await manager.showNotification();
} catch(e) {
print(e);
}
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