Perform scheduling on other thread

Author: aurimasc

com.unity.mobile.notifications/Runtime/Android/Plugins/com/unity/androidnotifications/UnityNotificationManager.java

@@ -261,34 +261,36 @@ public Object[] getNotificationChannels() {
 
     // This is called from Unity managed code to call AlarmManager to set a broadcast intent for sending a notification.
     public void scheduleNotification(Notification.Builder notificationBuilder) {
-        Bundle extras = notificationBuilder.getExtras();
-        int id = extras.getInt(KEY_ID, -1);
-        long repeatInterval = extras.getLong(KEY_REPEAT_INTERVAL, -1);
-        long fireTime = extras.getLong(KEY_FIRE_TIME, -1);
-        Notification notification = null;
-
-        // if less than a second in the future, notify right away
-        boolean fireNow = fireTime - Calendar.getInstance().getTime().getTime() < 1000;
-        if (!fireNow || repeatInterval > 0) {
-            if (fireNow) {
-                // schedule at next repetition
-                fireTime += repeatInterval;
-            }
+        mBackgroundThread.enqueueTask(() -> {
+            Bundle extras = notificationBuilder.getExtras();
+            int id = extras.getInt(KEY_ID, -1);
+            long repeatInterval = extras.getLong(KEY_REPEAT_INTERVAL, -1);
+            long fireTime = extras.getLong(KEY_FIRE_TIME, -1);
+            Notification notification = null;
+
+            // if less than a second in the future, notify right away
+            boolean fireNow = fireTime - Calendar.getInstance().getTime().getTime() < 1000;
+            if (!fireNow || repeatInterval > 0) {
+                if (fireNow) {
+                    // schedule at next repetition
+                    fireTime += repeatInterval;
+                }
 
-            Intent intent = buildNotificationIntentUpdateList(mContext, id);
+                Intent intent = buildNotificationIntentUpdateList(mContext, id);
 
-            if (intent != null) {
-                UnityNotificationManager.saveNotification(mContext, notificationBuilder.build());
-                notification = scheduleAlarmWithNotification(notificationBuilder, intent, fireTime);
+                if (intent != null) {
+                    UnityNotificationManager.saveNotification(mContext, notificationBuilder.build());
+                    notification = scheduleAlarmWithNotification(notificationBuilder, intent, fireTime);
+                }
             }
-        }
 
-        if (fireNow) {
-            if (notification == null) {
-                notification = buildNotificationForSending(mContext, mOpenActivity, notificationBuilder);
+            if (fireNow) {
+                if (notification == null) {
+                    notification = buildNotificationForSending(mContext, mOpenActivity, notificationBuilder);
+                }
+                notify(mContext, id, notification);
             }
-            notify(mContext, id, notification);
-        }
+        });
     }
 
     Notification scheduleAlarmWithNotification(Notification.Builder notificationBuilder, Intent intent, long fireTime) {