Wrapped notification channel getter method in sdk if statement to fix notifications not arriving on Android 5-7

app/build.gradle

@@ -10,8 +10,8 @@ android {
         applicationId "com.denizd.substitutionplan"
         minSdkVersion 21
         targetSdkVersion 28
-        versionCode 31
-        versionName "2.2.8"
+        versionCode 32
+        versionName "2.2.9"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
     buildTypes {

app/src/main/java/com/denizd/substitutionplan/data/DataFetcher.kt

@@ -211,11 +211,11 @@ internal class DataFetcher(isPlan: Boolean, isMenu: Boolean, isJobService: Boole
 
         val manager = mContext.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
 
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             HelperFunctions.getNotificationChannel(mContext, prefs)
+        }
 
-        val notification = NotificationCompat.Builder(mContext,
-            HelperFunctions.notificationChannelId
-        )
+        val notification = NotificationCompat.Builder(mContext, HelperFunctions.notificationChannelId)
             .setStyle(NotificationCompat.DecoratedCustomViewStyle())
             .setCustomContentView(notificationLayout)
             .setSmallIcon(R.drawable.ic_avh)