Problems with Services after restart the device in Android 9.0

ephramd

Hi,

• I'm using a Xiaomi MI 8 with Android 9.
• I have created a SERVICE that communicates with a server and with JS functions launch native actions.
• For example: It launches a toast and a notification every 5 seconds. (This works while the app is open).
• I see a new notification and toast every 5 seconds.

Problems:

• If I close the application the service stops. No more toast & notifications...
• If I turn the device off and on, the toast and 1 notification appear. (It seems to work but ...)
  But only 1 time! In the server JS the toast and the notification are thrown in a 5 second interval.

And the broadcastreceiver has the following structure:

[BroadcastReceiver(Enabled = true, Exported = true, DirectBootAware = true)]
    [IntentFilter(new[] { Intent.ActionBootCompleted, Intent.ActionLockedBootCompleted }, Priority = (int)IntentFilterPriority.HighPriority)]
    public class BootReceiver : BroadcastReceiver {
        public override void OnReceive(Context context, Intent intent) {
            CustomHelper.StartService(true); // This call a service with: Application.Context.StartForegroundService (new Intent (intent));
        }
    }

And I use Android.Manifest.Permission.ForegroundService.

I have read about the limitations in the documentation but maybe I do not apply it well.

**Can someone show me a complete example code? Thanks!
**
https://developer.android.com/about/versions/oreo/background.html#broadcasts
https://developer.android.com/topic/performance/background-optimization.html

Yelinzh

If I close the application the service stops. No more toast & notifications... And I use Android.Manifest.Permission.ForegroundService.

ForegroundService will not work when the app in background.

If I turn the device off and on, the toast and 1 notification appear. But only 1 time!

Could you post the related code?

Anandmaurya

@ephramd Use JobIntenService for Android OS Oreo and above to run the application in background and foreground.

https://forums.xamarin.com/discussion/134197/any-xamarin-android-c-sample-for-jobintentservice

And also add Broadcast Receiver Intent Filter dynamically.

ephramd

@yelinzh @Anandmaurya
thanks for answering and orget what I mentioned.

I just want a BroadcastReceiver that after turning on the device (or removing the power cable) start a service without using a fixed notification (as foreground does) and that works on Android 9.0.

Can anyone share a simple example code with the structure code (Manifest.xml, Main.cs, Service.cs and BroadcastReceiver.cs)?

I am reading the documentation but I do not see any full example, I have nothing clear how to make it work in the current version of android.

ephramd

@yelinzh @Anandmaurya I tried this:

• RegistrationIntentService works, but if I close the app it is also finished.
• CustomBroadcastReceiver does nothing.

MainActivity.cs:
protected override void OnCreate(Bundle savedInstanceState) {
base.OnCreate(savedInstanceState);

            Console.WriteLine("------------------ OnCreate service started ");
            Log.Info("Fran", "------------------ OnCreate service started");
            Toast.MakeText(Application.Context, "OnCreate service started", ToastLength.Short).Show();

            Intent service = new Intent(this, typeof(RegistrationIntentService));
            service.PutExtra("prueba", "fran");
            RegistrationIntentService.EnqueueWork(this, service);

        }

AndroidManifest.xml

RegistrationIntentService:
[Service(Name = "com.MyPackageName.RegistrationIntentService", Permission = "android.permission.BIND_JOB_SERVICE", Exported = true)]
public class RegistrationIntentService : Android.Support.V4.App.JobIntentService {

    private static int MY_JOB_ID = 1000;

    public static void EnqueueWork(Context context, Intent work) {

        Java.Lang.Class cls = Java.Lang.Class.FromType(typeof(RegistrationIntentService));

        Console.WriteLine("------------------ EnqueueWork start ");
        Log.Info("TEST", "------------------ EnqueueWork start");
        Toast.MakeText(Application.Context, "EnqueueWork start", ToastLength.Short).Show();

        try {
            EnqueueWork(context, cls, MY_JOB_ID, work);
        }
        catch (Exception ex) {
            Console.WriteLine("------------------ EnqueueWork Exception: {0}", ex.Message);
            Log.Info("TEST", "------------------ EnqueueWork Exception: {0}");
            Toast.MakeText(Application.Context, "EnqueueWork Exception: {0}", ToastLength.Short).Show();
        }

    }

    protected override void OnHandleWork(Intent p0) {
        Console.WriteLine("------------------ OnHandleWork service started ");
        Log.Info("TEST", "------------------ OnHandleWork service started");

        Task.Run(async () => {


            int i = 1;
            while(i > 0)  {
                Console.WriteLine("------------------ OnHandleWork Run Task: " + i);
                Log.Info("TEST", "------------------ OnHandleWork Run Task: " + i);
                //Toast.MakeText(Application.Context, "OnHandleWork Run Task: " + i, ToastLength.Short).Show();
                i++;
                await Task.Delay(2500);
            }

        });


        }

CustomBroadcastReceiver:
[BroadcastReceiver(Enabled = true, Exported = true, DirectBootAware = true)]
class CustomBroadcastReceiver : BroadcastReceiver {
public override void OnReceive(Context context, Intent intent) {
Console.WriteLine("------------------ MiBroadcastReceiver");
Log.Info("Fran", "------------------ MiBroadcastReceiver");
Toast.MakeText(Application.Context, "MiBroadcastReceiver", ToastLength.Short).Show();

            if (intent.Action.Equals(Intent.ActionBootCompleted)) {
                Console.WriteLine("------------------ MiBroadcastReceiver ActionBootCompleted");
                Log.Info("TEST", "------------------ MiBroadcastReceiver ActionBootCompleted");
                Toast.MakeText(Application.Context, "MiBroadcastReceiver ActionBootCompleted", ToastLength.Short).Show();
            }

            if (intent.Action.Equals(Intent.ActionPowerDisconnected)) {
                Console.WriteLine("------------------ MiBroadcastReceiver ActionPowerDisconnected");
                Log.Info("TEST", "------------------ MiBroadcastReceiver ActionPowerDisconnected");
                Toast.MakeText(Application.Context, "MiBroadcastReceiver ActionPowerDisconnected", ToastLength.Short).Show();
            }

            if (intent.Action.Equals(Intent.ActionPowerConnected)) {
                Console.WriteLine("------------------ MiBroadcastReceiver ActionPowerConnected");
                Log.Info("TEST", "------------------ MiBroadcastReceiver ActionPowerConnected");
                Toast.MakeText(Application.Context, "MiBroadcastReceiver ActionPowerConnected", ToastLength.Short).Show();
            }

        }