Removed pebble symbol from Unciv icon when showing persistent notification (#2003)

Optimized Notification service texts
https://github.com/yairm210/Unciv/issues/1680

android/assets/jsons/translationsByLanguage/German.properties

@@ -1747,8 +1747,9 @@ An error has occured = Ein Fehler ist aufgetreten
 Multiplayer turn notifier service terminated = Multiplayer Zug Benachrichtigungsdienst wurde beendet
 Your friends are waiting on your turn. = Deine Freunde warten auf deinen Zug.
 Unciv - It's your turn! = Unciv - Du bist am Zug!
-Unciv will inform you when it's your turn. = Unciv wird dich benachrichtigen wenn du am Zug bist.
-Last checked: [lastTimeChecked]. Checks ca. every [checkPeriod] minute(s) when Internet available. = Zuletzt geprüft: [lastTimeChecked]. Prüft etwa alle [checkPeriod] Minute(n) wenn Internet vorhanden.
+Unciv will inform you when it's your turn in multiplayer. = Unciv wird dich benachrichtigen, wenn du im Multiplayer am Zug bist.
+Last online turn check: [lastTimeChecked] = Letzter online Zug Check: [lastTimeChecked]
+Checks ca. every [checkPeriod] minute(s) when Internet available. = Prüft etwa alle [checkPeriod] Minute(n) wenn Internet vorhanden.
 Configurable in Unciv options menu. = Konfigurierbar im Unciv Optionsmenü.
 Unciv multiplayer turn notifier running = Unciv Multiplayer Zug Benachrichtiger läuft.
 Multiplayer options = Multiplayer Einstellungen

android/assets/jsons/translationsByLanguage/template.properties

@@ -1746,8 +1746,9 @@ An error has occured =
 Multiplayer turn notifier service terminated = 
 Your friends are waiting on your turn. = 
 Unciv - It's your turn! = 
-Unciv will inform you when it's your turn. = 
-Last checked: [lastTimeChecked]. Checks ca. every [checkPeriod] minute(s) when Internet available. = 
+Unciv will inform you when it's your turn in multiplayer. = 
+Last online turn check: [lastTimeChecked] = 
+Checks ca. every [checkPeriod] minute(s) when Internet available. = 
 Configurable in Unciv options menu. = 
 Unciv multiplayer turn notifier running = 
 Multiplayer options = 

android/src/com/unciv/app/AndroidLauncher.kt

@@ -12,7 +12,7 @@ import java.io.File
 class AndroidLauncher : AndroidApplication() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        createNotificationChannels()
+        MultiplayerTurnCheckWorker.createNotificationChannels(applicationContext)
 
 		// Only allow mods on KK+, to avoid READ_EXTERNAL_STORAGE permission earlier versions need
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
@@ -26,14 +26,6 @@ class AndroidLauncher : AndroidApplication() {
         initialize(game, config)
     }
 
-    /**
-     * Necessary for Multiplayer Turner Checker, starting with Android Oreo
-     */
-    private fun createNotificationChannels() {
-        MultiplayerTurnCheckWorker.createNotificationChannelInfo(context)
-        MultiplayerTurnCheckWorker.createNotificationChannelService(context)
-    }
-
 	/**
 	 * Copies mods from external data directory (where users can access) to the private one (where
 	 * libGDX reads from). Note: deletes all files currently in the private mod directory and

android/src/com/unciv/app/MultiplayerTurnCheckWorker.kt

@@ -10,6 +10,7 @@ import android.os.Build
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationCompat.DEFAULT_VIBRATE
 import androidx.core.app.NotificationManagerCompat
+import androidx.core.content.ContextCompat.getSystemService
 import androidx.work.*
 import com.badlogic.gdx.backends.android.AndroidApplication
 import com.unciv.logic.GameInfo
@@ -27,13 +28,18 @@ class MultiplayerTurnCheckWorker(appContext: Context, workerParams: WorkerParame
         const val WORK_TAG = "UNCIV_MULTIPLAYER_TURN_CHECKER_WORKER"
         const val NOTIFICATION_ID_SERVICE = 1
         const val NOTIFICATION_ID_INFO = 2
+
+        // Notification Channels can't be modified after creation.
+        // Therefore Unciv needs to create new ones and delete previously used ones.
+        // Add old channel names here when replacing them with new ones below.
+        private val HISTORIC_NOTIFICATION_CHANNELS = arrayOf("UNCIV_NOTIFICATION_CHANNEL_SERVICE")
+
         private const val NOTIFICATION_CHANNEL_ID_INFO = "UNCIV_NOTIFICATION_CHANNEL_INFO"
-        private const val NOTIFICATION_CHANNEL_ID_SERVICE = "UNCIV_NOTIFICATION_CHANNEL_SERVICE"
+        private const val NOTIFICATION_CHANNEL_ID_SERVICE = "UNCIV_NOTIFICATION_CHANNEL_SERVICE_02"
 
 
         // These fields need to be volatile because they are set by main thread but later accessed by worker thread.
         // Classes used here need to be primitive or internally synchronized to avoid visibility issues.
-        // Long and double must not be used here because they have visibility issues: https://stackoverflow.com/a/9278798
         @Volatile private var failCount = 0
         @Volatile private var gameId = ""
         @Volatile private var userId = ""
@@ -90,6 +96,8 @@ class MultiplayerTurnCheckWorker(appContext: Context, workerParams: WorkerParame
                 val descriptionText = "Shown constantly to inform you about background checking."
                 val importance = NotificationManager.IMPORTANCE_MIN
                 val mChannel = NotificationChannel(NOTIFICATION_CHANNEL_ID_SERVICE, name, importance)
+                mChannel.setShowBadge(false)
+                mChannel.setLockscreenVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                 mChannel.description = descriptionText
 
                 val notificationManager = appContext.getSystemService(AndroidApplication.NOTIFICATION_SERVICE) as NotificationManager
@@ -110,16 +118,17 @@ class MultiplayerTurnCheckWorker(appContext: Context, workerParams: WorkerParame
 
                 val notification: NotificationCompat.Builder = NotificationCompat.Builder(appContext, NOTIFICATION_CHANNEL_ID_SERVICE)
                         .setPriority(NotificationManagerCompat.IMPORTANCE_MIN) // it's only a status
-                        .setContentTitle("Unciv multiplayer turn notifier running".tr())
+                        .setContentTitle(("Last online turn check: [$lastTimeChecked]").tr())
                         .setStyle(NotificationCompat.BigTextStyle()
-                                .bigText("Unciv will inform you when it's your turn.".tr() + "\n" +
-                                        "Last checked: [$lastTimeChecked]. Checks ca. every [$checkPeriod] minute(s) when Internet available.".tr()
+                                .bigText("Unciv will inform you when it's your turn in multiplayer.".tr() + " " +
+                                        "Checks ca. every [$checkPeriod] minute(s) when Internet available.".tr()
                                         + " " + "Configurable in Unciv options menu.".tr()))
                         .setSmallIcon(R.drawable.uncivicon2)
                         .setContentIntent(pendingIntent)
                         .setCategory(NotificationCompat.CATEGORY_SERVICE)
                         .setOnlyAlertOnce(true)
                         .setOngoing(true)
+                        .setShowWhen(false)
 
                 with(NotificationManagerCompat.from(appContext)) {
                     notify(NOTIFICATION_ID_INFO, notification.build())
@@ -168,6 +177,30 @@ class MultiplayerTurnCheckWorker(appContext: Context, workerParams: WorkerParame
                 enqueue(applicationContext, 1)
             }
         }
+
+        /**
+         * Necessary for Multiplayer Turner Checker, starting with Android Oreo
+         */
+        fun createNotificationChannels(appContext: Context) {
+            createNotificationChannelInfo(appContext)
+            createNotificationChannelService(appContext)
+            destroyOldChannels(appContext)
+        }
+
+        /**
+         *  Notification Channels can't be modified after creation.
+         *  Therefore Unciv needs to create new ones and delete legacy ones.
+         */
+        private fun destroyOldChannels(appContext: Context) {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+                val notificationManager = appContext.getSystemService(AndroidApplication.NOTIFICATION_SERVICE) as NotificationManager
+                HISTORIC_NOTIFICATION_CHANNELS.forEach {
+                    if (null != notificationManager.getNotificationChannel(it)) {
+                        notificationManager.deleteNotificationChannel(it)
+                    }
+                }
+            }
+        }
     }
 
     override fun doWork(): Result {