Question

当用户完成任务时，是否可以通过任何方式从服务器发送推送通知？例如：待办事项应用程序将在该日期通过推送通知进行通知。我想使用Firebase和Firestore来存储用户令牌。警报管理器可以是我找到的解决方案，但我不想使用它。

Answer 1

是的，您可以使用调度程序将通知从服务器发送到您的应用程序：您可以按照我的工作代码进行操作：

补充IJob：

 public class SendNotificationViaFcm: IJob
    {


        public void Execute(IJobExecutionContext context)
        {
            bool isNotificationSent=false;
            try
            {
                var taskToSendNotification = FirebaseCloudMessaging.SendMessage();
                Task.WaitAll(taskToSendNotification);
                 isNotificationSent = taskToSendNotification.Result;

            }
            catch (Exception exception)
                when (
                    exception is ObjectDisposedException || exception is ArgumentNullException ||
                    exception is AggregateException)
            {

            }
            catch (Exception exception) when (exception is InvalidOperationException)
            {

            }
            catch (Exception exception)
            {
                // ignored
            }

        }


    }

从服务器呼叫FCM Api：

public class FirebaseCloudMessaging
    {
        private static readonly Uri FcmUri = new Uri(
            uriString: @"https://fcm.googleapis.com",
            uriKind: UriKind.Absolute);
        private const string FcmApiKey = "Your Legacy Server Key";

        public static async Task<bool> SendMessage()
        {
            using (var httpClient = new HttpClient())
            {
                httpClient.BaseAddress = FcmUri;
                httpClient.DefaultRequestHeaders.Clear();
                httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Authorization",
                        "key=" + FcmApiKey);

                var response = await httpClient.PostAsJsonAsync(@"/fcm/send", new
                {
                    to = "/topics/global",
                    priority = "high",
                    data = new
                    {
                        title = "Warning",
                        message = "Please start app to track movemoent!"

                    }
                    //to = "/topics/global",
                    //priority = "high",
                    //notification = new
                    //{
                    //    title = "Warning!",
                    //    body = "Please start app to track movemoent!"
                    //}
                 });

                Debug.Write(response.Content.ReadAsStringAsync());
                var ck = response.IsSuccessStatusCode;
                return response.IsSuccessStatusCode;
            }
        }
    }

在您的时间间隔内实施时间表：

public class Scheduler
    {
        public static void Start()
        {
            try
            {
                IScheduler scheduler = StdSchedulerFactory.GetDefaultScheduler();
                scheduler.Start();
               // scheduler.Shutdown();

                var sentCloudNotification = JobBuilder.Create<SendNotificationViaFcm>().Build();
                var cloudNotificationTrigger = TriggerBuilder.Create().WithSimpleSchedule(x => x.WithIntervalInMinutes(1).RepeatForever()).Build();
                scheduler.ScheduleJob(sentCloudNotification, cloudNotificationTrigger);
            }
            catch (SchedulerException exception)
            {
                Debug.Write(exception.Message);
            }
            catch (Exception exception)
            {
                Debug.Write(exception.Message);
            }
        }
    }

最后从您的Global.asax.cs

运行

protected void Application_Start()
        {

            Scheduler.Start();
        }

Answer 2

听起来您正在寻找一种可以安排事务通知的工具。您正在使用哪种服务器技术？

从高层次上，您可以执行以下操作： 1）用户在Android应用程序中添加任务 2）android应用程序向服务器发送请求以保存任务 3）您有一些在某种任务保存回调中运行的代码，该回调计划使用crontab，celery或类似工具安排将来运行的代码块。 4）将来运行的代码块是对twilio的api调用，用于发送推送通知

相关链接：https://www.twilio.com，https://firebase.google.com/docs/cloud-messaging/，http://www.celeryproject.org/，https://en.wikipedia.org/wiki/Cron

自动从应用服务器发送推送通知

2 个答案: