我使用 workmanager 每 15 分钟在后台检索用户的位置。当位置获取失败时，我会收到一条错误通知，如图所示。我想知道如何防止通知出现在失败的情况下。
void callbackDispatcher() {
Workmanager.executeTask((taskName, inputData) async {
if (taskName == FETCH_USER_POSITION_IN_BACKGROUND_TASK_NAME) {
// TODO: Find a better way to get user position, maybe with ServiceLocator or even better with BLoC
final dataSource = GeolocatorDataSource();
final remoteDataSource = FirestoreRemoteDataSource(
firebaseFirestore: FirebaseFirestore.instance,
);
final repository = GeolocationRepository(
geolocationDataSource: dataSource,
remoteDataSource: remoteDataSource,
);
final positionEither = await repository.getUserPosition();
positionEither.fold((failure) async {
print('failure: $failure');
}, (position) async {
print('position = $position');
final storePositionEither =
await repository.storeUserPosition(position, inputData['uid']);
storePositionEither.fold((failure) async {
print('failure: $failure');
}, (isStored) async {
print("Position has been successfully stored in background!");
});
});
}
return Future.value(true);
});
}
void _initializeWorkManagerWhenAuthenticated(String userId) {
bool isProduction = bool.fromEnvironment('dart.vm.product');
Workmanager.initialize(
callbackDispatcher,
isInDebugMode: !isProduction,
);
Workmanager.registerPeriodicTask(
FETCH_USER_POSITION_IN_BACKGROUND_TASK_ID,
FETCH_USER_POSITION_IN_BACKGROUND_TASK_NAME,
frequency: Duration(minutes: 15),
existingWorkPolicy: ExistingWorkPolicy.keep,
inputData: {
'userId': userId,
},
);
}
