Get reminders based on data in a database - xamarin

Question

I want to get reminders for some Appointments that I have saved in database and they have a notificationTime property witch is the time when a notification needs to be displayed.
My approach so far is to write some kind of job that runs 1 or 2 times a day to pull the notifications that need to be registered in the next 24h and ofc register them (if you guys have a better ideea lmk :D )
This works BUT:
Only if the app is in foreground / background; then I get notification every 15min or so;
If I KILL the app I don't receive notification on my physical device (Xiaomi Redmi Note 9 Pro with Android version 12 SKQ),
only on the virtual one (Pixel 5 Android 13)
Right now I have a class that extends JobService and I use JobScheduler to schedule the Job to run every 15 min (for testing so I don't need to w8 12h xD )
Here is the JobScheduler witch I call in MainActivity file in OnCreate method
Console.WriteLine("Schedualing job");
TimeSpan interval = TimeSpan.FromMinutes(15);
var javaClass = Java.Lang.Class.FromType(typeof(NotificationService));
var componentName = new ComponentName(Application.Context, javaClass);
var jobInfo = new JobInfo.Builder(1, componentName)
.SetPeriodic(15 * 60 * 1000, 30 * 60 * 1000)
.SetRequiredNetworkType(NetworkType.Any)
.SetPersisted(true)
.Build();
var jobScheduler = (JobScheduler)GetSystemService(JobSchedulerService);
var resultCode = jobScheduler.Schedule(jobInfo);
and here is the NotificationService.cs
[Service(Name = "com.companyname.deratizare_mobile.NotificationService",
Permission = "android.permission.BIND_JOB_SERVICE")]
public class NotificationService : JobService
{
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
return StartCommandResult.StickyCompatibility;
}
public override bool OnStartJob(JobParameters #params)
{
Console.WriteLine("Job started");
Task.Run(async () =>
{
//var hasSuccessful = await ProccessNotificationToRegister();
var notification = new NotificationRequest
{
Title = "Job",
Description = $"Description",
Schedule = new NotificationRequestSchedule
{
NotifyTime = DateTime.Now,
}
};
LocalNotificationCenter.Current.Show(notification);
JobFinished(#params, false);
Console.WriteLine("Job finished");
});
return true;
}
public override bool OnStopJob(JobParameters #params)
{
Console.WriteLine("Job stopped");
return true;
}
}
AndroidManifest
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NOTIFICATION_POLICY" />
<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
<uses-permission android:name="android.permission.BIND_JOB_SERVICE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
UPDATE
I have given permission to auto start to my app from the device and it works
SOLUTION
I ended up using FCM and a hosted service on the server that checks the cache every 5 minutes where I have stored the next notification that needs to be displaied

Answer 1

You can try to use Firebase push notifications.
With push notifications, you can update your users without requiring the app to run at all times or having it poll a server, potentially running down the battery.
For more information, you can check Implementing Push Notifications in Your Android Apps and Firebase Cloud Messaging.