BroadcastReceiver does not work on Android 12 - xamarin.forms

Question

In my Xamarin Forms project I have:
[BroadcastReceiver(Permission = "RECEIVE_BOOT_COMPLETED",
Exported = true,
Enabled = true)]
[IntentFilter(new[] {Intent.ActionBootCompleted})]
public class GeofenceReceiver: BroadcastReceiver
I use it for GeofenceTransitionEnter and GeofenceTransitionExit events.
I also have ACCESS_FINE_LOCATION and ACCESS_BACKGROUND_LOCATION permissions.
But OnReceive method is not called on API 31. I have not this problem with lower APIs.
Android 12 targetSDKVersion 31 challenges (Broadcast Receiver, Pending Intent) Crash Issues - doesn't work for me

Answer 1

I have done a sample to test. And it worked well, the OnReceive method will call a few minutes after the device restarted.
The receiver:
[BroadcastReceiver(Permission = "RECEIVE_BOOT_COMPLETED",
Exported = true,
Enabled = true)]
[IntentFilter(new[] { Intent.ActionBootCompleted })]
public class GeofenceReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
//launch our activity
if (intent.Action == "android.intent.action.BOOT_COMPLETED")
{
Toast.MakeText(context,"Device Restart",ToastLength.Long).Show();
Intent intent1 = new Intent(context,typeof(ForegroundServiceDemo));
intent1.SetFlags(ActivityFlags.NewTask);
context.StartForegroundService(intent1);
}
}
}
The foreground service:
[Service]
public class ForegroundServiceDemo : Service
{
private string NOTIFICATION_CHANNEL_ID = "1000";
private int NOTIFICATION_ID = 1;
private string NOTIFICATION_CHANNEL_NAME = "notification";
private void startForegroundService()
{
var notifcationManager = GetSystemService(Context.NotificationService) as NotificationManager;
if (Build.VERSION.SdkInt >= BuildVersionCodes.O)
{
createNotificationChannel(notifcationManager);
}
var notification = new NotificationCompat.Builder(this, NOTIFICATION_CHANNEL_ID);
notification.SetAutoCancel(false);
notification.SetOngoing(true);
notification.SetSmallIcon(Resource.Mipmap.icon);
notification.SetContentTitle("ForegroundService");
notification.SetContentText("Foreground Service is running");
StartForeground(NOTIFICATION_ID, notification.Build());
}
private void createNotificationChannel(NotificationManager notificationMnaManager)
{
var channel = new NotificationChannel(NOTIFICATION_CHANNEL_ID, NOTIFICATION_CHANNEL_NAME,
NotificationImportance.Low);
notificationMnaManager.CreateNotificationChannel(channel);
}
public override IBinder OnBind(Intent intent)
{
return null;
}
public override StartCommandResult OnStartCommand(Intent intent, StartCommandFlags flags, int startId)
{
startForegroundService();
return StartCommandResult.NotSticky;
}
}
The AndroidManifest.xml:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
      <uses-permission android:name="android.permission.START_FOREGROUND_SERVICES_FROM_BACKGROUND" />
      <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
      <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
I added the RECEIVE_BOOT_COMPLETED into the AndroidManifes.xml, because if I just added it in the [BroadcastReceiver], the receiver will not work. So you can also try to add it in the AndroidManifes.xml.
In addition, you can create a new project to test my code. It worked on Android 12.0 emulator when I tested it. Finally, if it still not work, could you please show the code in the OnReceive method? Maybe the OnReceive method was called, but the code in it can't run background such as start an activity.

Answer 2

I just added something like this into GepfencePendingIntent:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_MUTABLE)
} else {
PendingIntent.getBroadcast(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
}
I found it here: https://www.flybuy.com/android-12-pendingintent-mutability-and-geofences