Create notification channels prior to starting service

We don't need notification permission to start services however
channels must still exist and notification must be sent regardless.

Trying to do this in service results in crash, thus do it before
service is triggered.

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/java/com/aurora/store/AuroraApplication.kt

@@ -19,8 +19,12 @@
 
 package com.aurora.store
 
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.os.Build
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.multidex.MultiDexApplication
+import com.aurora.Constants
 import com.aurora.store.data.downloader.DownloadManager
 import com.aurora.store.data.providers.NetworkProvider
 import com.aurora.store.data.receiver.PackageManagerReceiver
@@ -28,6 +32,7 @@ import com.aurora.store.data.service.NotificationService
 import com.aurora.store.util.CommonUtil
 import com.aurora.store.util.PackageUtil
 import com.tonyodev.fetch2.Fetch
+import java.util.ArrayList
 import nl.komponents.kovenant.android.startKovenant
 import nl.komponents.kovenant.android.stopKovenant
 
@@ -45,6 +50,9 @@ class AuroraApplication : MultiDexApplication() {
 
         AppCompatDelegate.setCompatVectorFromResourcesEnabled(true)
 
+        //Create Notification Channels : General & Alert
+        createNotificationChannel()
+
         NotificationService.startService(this)
 
         fetch = DownloadManager.with(this).fetch
@@ -79,4 +87,33 @@ class AuroraApplication : MultiDexApplication() {
             .unbind()
         super.onLowMemory()
     }
+
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
+            val channels = ArrayList<NotificationChannel>()
+            channels.add(
+                NotificationChannel(
+                    Constants.NOTIFICATION_CHANNEL_ALERT,
+                    getString(R.string.notification_channel_alert),
+                    NotificationManager.IMPORTANCE_HIGH
+                )
+            )
+            channels.add(
+                NotificationChannel(
+                    Constants.NOTIFICATION_CHANNEL_GENERAL,
+                    getString(R.string.notification_channel_general),
+                    NotificationManager.IMPORTANCE_MIN
+                )
+            )
+            channels.add(
+                NotificationChannel(
+                    Constants.NOTIFICATION_CHANNEL_UPDATER_SERVICE,
+                    getString(R.string.notification_channel_updater_service),
+                    NotificationManager.IMPORTANCE_MIN
+                )
+            )
+            notificationManager.createNotificationChannels(channels)
+        }
+    }
 }

app/src/main/java/com/aurora/store/data/service/NotificationService.kt

@@ -92,9 +92,6 @@ class NotificationService : Service() {
 
         notificationManager = getSystemService(NOTIFICATION_SERVICE) as NotificationManager
 
-        //Create Notification Channels : General & Alert
-        createNotificationChannel()
-
         fetch = DownloadManager.with(this).fetch
 
         fetchListener = object : AbstractFetchGroupListener() {
@@ -147,34 +144,6 @@ class NotificationService : Service() {
         fetch.addListener(fetchListener)
     }
 
-    private fun createNotificationChannel() {
-        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-            val channels = ArrayList<NotificationChannel>()
-            channels.add(
-                NotificationChannel(
-                    Constants.NOTIFICATION_CHANNEL_ALERT,
-                    getString(R.string.notification_channel_alert),
-                    NotificationManager.IMPORTANCE_HIGH
-                )
-            )
-            channels.add(
-                NotificationChannel(
-                    Constants.NOTIFICATION_CHANNEL_GENERAL,
-                    getString(R.string.notification_channel_general),
-                    NotificationManager.IMPORTANCE_MIN
-                )
-            )
-            channels.add(
-                NotificationChannel(
-                    Constants.NOTIFICATION_CHANNEL_UPDATER_SERVICE,
-                    getString(R.string.notification_channel_updater_service),
-                    NotificationManager.IMPORTANCE_MIN
-                )
-            )
-            notificationManager.createNotificationChannels(channels)
-        }
-    }
-
     private fun showNotification(groupId: Int, download: Download, fetchGroup: FetchGroup) {
         val status = download.status