只能在 Xamarin 上推送一次通知 android

Question

我正在使用 Xamarin 制作一个提醒应用程序。我正在尝试发送通知，但是每次我运行该应用程序时，无论用户创建了多少提醒，我都只能推送一个通知。

这是我的通知代码：

using Android.App;
using Android.Content;
using Newtonsoft.Json;
using ReminderApp.Models;
using ReminderApp.HelperRepository;
using Android.OS;
using System;
using static Android.Media.Audiofx.BassBoost;
using Android.Media;

namespace ReminderApp.Notifications
{
    [Activity(Label = "ReminderApp")]
    public class ReminderNotifications : Activity
    {
        Reminder reminder;
        public ReminderNotifications()
        {
        }

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);
            string CHANNEL_ID = "dan1414";
            int NOTIFY_ID = 0 + new Random().Next(1, 30);

            var channel = new NotificationChannel(CHANNEL_ID, "FCM Notifications", NotificationImportance.Default)
            {
                Description = "Firebase Cloud Messages appear in this channel"
            };

            string date = Intent.GetStringExtra("date");
            string time = Intent.GetStringExtra("time");
   

            reminder = ReminderHelper.SelectReminderByDateAndTime(this, date, time);
            if (reminder != null)
            {
                Intent newIntent = new Intent(this, typeof(ReminderContent));
                newIntent.PutExtra("reminder", JsonConvert.SerializeObject(reminder));

                Android.Support.V4.App.TaskStackBuilder stackBuilder = Android.Support.V4.App.TaskStackBuilder.Create(this);
                stackBuilder.AddParentStack(Java.Lang.Class.FromType(typeof(ReminderContent)));
                stackBuilder.AddNextIntent(newIntent);

                PendingIntent resultPendingIntent = stackBuilder.GetPendingIntent(0, (int)PendingIntentFlags.UpdateCurrent);

                Notification.Builder builder = new Notification.Builder(this, CHANNEL_ID)
                .SetAutoCancel(true)
                .SetContentIntent(resultPendingIntent)
                .SetContentTitle("Reminder!!")
                .SetSmallIcon(Resource.Drawable.Screenshot_2020_11_11_at_4_57_02_PM)
                .SetContentText("Click for details..");
                NotificationManager notificationManager = (NotificationManager)GetSystemService(NotificationService);
                notificationManager.CreateNotificationChannel(channel);
                notificationManager.Notify(NOTIFY_ID, builder.Build());
            }
            SetContentView(Resource.Layout.NotificationAlert);
        }
    }
}

我没有发现我的代码有什么问题，我尝试了很多不同的方法，但没有任何效果。

这是我的完整代码，以防有帮助：https://github.com/CrazyDanyal1414/ReminderApp

感谢任何帮助！

Answer 1

在ScheduleReminder方法中，请修改PendingIntent第二个参数如下：

   PendingIntent.GetActivity(this, new Random().Next(), myIntent, 0);

确保 PendingIntent 第二个参数的值是唯一的，否则新警报将覆盖旧警报。

public void ScheduleReminder(Reminder reminder)
    {
        AlarmManager manager = (AlarmManager)GetSystemService(AlarmService);
        Intent myIntent;
        PendingIntent pendingIntent;
        myIntent = new Intent(this, typeof(ReminderNotifications));
        myIntent.PutExtra("date", reminder.Date);
        myIntent.PutExtra("time", reminder.Time);

        var t = reminder.Time.Split(':');
        var ampm = t[1].Split(' ')[1];
        var hrr = Convert.ToDouble(t[0]);
        var min = Convert.ToDouble(t[1].Split(' ')[0]);

        string dateString = Convert.ToString(reminder.Date + " " + hrr + ":" + min + ":00 " + ampm);

        DateTimeOffset dateOffsetValue = DateTimeOffset.Parse(dateString);
        var millisec = dateOffsetValue.ToUnixTimeMilliseconds();

        PendingIntent.GetActivity(this, new Random().Next(), myIntent, 0);
        manager.Set(AlarmType.RtcWakeup, millisec, pendingIntent);
    }

只能在 Xamarin 上推送一次通知 android

Can only push notification once on Xamarin android

c#

xamarin.android

android-notifications