Xamarin forms, Broadcast Receiver dosen't hit when application is closed - xamarin.android

Question

I'm developing an app using Xamarin forms, I have a Broadcast receiver which monitors connectivity change. It works perfectly when application is active, but when I close my application(just slide it out from the recent apps tray) the Broadcast receiver stops working.I'm not able find where i'm committing mistake.
Below is my manifest file :
<uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="com.ETMS.taskmanagement.permission.C2D_MESSAGE" />
<permission android:name="com.ETMS.taskmanagement.permission.C2D_MESSAGE" android:protectionLevel="signature" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
below is my Broadcast Receiver :
namespace ETMS.Droid.Receiver
{
[BroadcastReceiver(Enabled = true,Exported = true)]
[IntentFilter(new string[] { "android.net.conn.CONNECTIVITY_CHANGE" })]
class ConnectivityReceiver : BroadcastReceiver
{
public override void OnReceive(Context context, Intent intent)
{
Log.Debug("ETMS CONNECTIVITY ", "Reached Connectivity");
LocalPreferenceManager mManager = new LocalPreferenceManager(context);
bool hasNetwork = !intent.GetBooleanExtra(ConnectivityManager.ExtraNoConnectivity, false);
if (hasNetwork)
{
bool authenticate = GeofenceSPService.AuthenticateSp();
if (authenticate)
{
GeofenceSPService.SyncGeofenceToServer(mManager);
GeofenceSPService.LogTrace("Raj", "Connectivity Receiver : " + authenticate);
}
}
else
{
Log.Error("ETMS CONNECTIVITY ", "Reached Connectivity");
}
}
public bool IsConnected(Context context)
{
ConnectivityManager cm = (ConnectivityManager) context.GetSystemService(Context.ConnectivityService);
NetworkInfo activeNetwork = cm.ActiveNetworkInfo;
bool isConnected = activeNetwork != null && activeNetwork.IsConnectedOrConnecting;
return isConnected;
}
private void SendNotification(string networkDetails, Context context)
{
// Create an explicit content Intent that starts the main Activity.
Intent notificationIntent = new Intent(context, typeof(MainActivity));
// Construct a task stack
TaskStackBuilder stackBuilder = TaskStackBuilder.Create(context);
// Add the main Activity to the task stack as the parent.
stackBuilder.AddParentStack(Java.Lang.Class.FromType(typeof(MainActivity)));
// push the content Intent onto the stack.
stackBuilder.AddNextIntent(notificationIntent);
// Get a PendingINtent containing the entire backstack
PendingIntent notificationPendingIntent = stackBuilder.GetPendingIntent(0, PendingIntentFlags.UpdateCurrent);
// Get a notification builder that's compatible with platform versions >= 4
Notification.Builder builder = new Notification.Builder(context);
//Define the notification settings.
builder.SetSmallIcon(Resource.Drawable.networkoff)
.SetContentTitle(networkDetails)
.SetContentText("Network Connectivity")
.SetContentIntent(notificationPendingIntent);
// Dismiss the notification once the user touches it.
builder.SetAutoCancel(true);
// Get an instance of the Notification manager
NotificationManager mNotificationManager =
(NotificationManager) context.GetSystemService(Context.NotificationService);
mNotificationManager.Notify(0, builder.Build());
}
}
}