Silence easter egg notifications.

Bug: 412622628
Flag: EXEMPT bugfix
Test: adb shell am start -n com.android.egg/.landroid.MainActivity
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:21fb0e179ff72dfe2ba3aa36b980616c0e8d38a3)
Merged-In: Id27b0b244580e97a00fa6269e4abd9424329e7be
Change-Id: Id27b0b244580e97a00fa6269e4abd9424329e7be
diff --git a/packages/EasterEgg/src/com/android/egg/landroid/UniverseProgressNotifier.kt b/packages/EasterEgg/src/com/android/egg/landroid/UniverseProgressNotifier.kt
index 705d9e1..da96c3c 100644
--- a/packages/EasterEgg/src/com/android/egg/landroid/UniverseProgressNotifier.kt
+++ b/packages/EasterEgg/src/com/android/egg/landroid/UniverseProgressNotifier.kt
@@ -39,7 +39,7 @@
 class UniverseProgressNotifier(val context: Context, val universe: Universe) {
     private val notificationId = universe.randomSeed.toInt()
     private val chan =
-        NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_DEFAULT)
+        NotificationChannel(CHANNEL_ID, CHANNEL_NAME, NotificationManager.IMPORTANCE_LOW)
             .apply { lockscreenVisibility = Notification.VISIBILITY_PUBLIC }
     private val noman =
         context.getSystemService(NotificationManager::class.java)?.apply {
@@ -83,7 +83,7 @@
                     PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE,
                 )
             )
-            .setPriority(Notification.PRIORITY_DEFAULT)
+            .setFlag(Notification.FLAG_ONLY_ALERT_ONCE, true)
             .setColorized(true)
             .setOngoing(true)
             .setColor(Colors.Eigengrau2.toArgb())