Show notification while download cache is renewing

Since users seem to be confused now that the library loads before download info is shown...

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadCache.kt

@@ -48,6 +48,8 @@ class DownloadCache(
 
     private val scope = CoroutineScope(Dispatchers.IO)
 
+    private val notifier by lazy { DownloadNotifier(context) }
+
     /**
      * The interval after which this cache should be invalidated. 1 hour shouldn't cause major
      * issues, as the cache is only used for UI feedback.
@@ -241,6 +243,9 @@ class DownloadCache(
         }
 
         renewalJob = scope.launchIO {
+            try {
+                notifier.onCacheProgress()
+
                 var sources = getSources()
 
                 // Try to wait until extensions and sources have loaded
@@ -291,6 +296,9 @@ class DownloadCache(
 
                 lastRenew = System.currentTimeMillis()
                 notifyChanges()
+            } finally {
+                notifier.dismissCacheProgress()
+            }
         }
     }
 

app/src/main/java/eu/kanade/tachiyomi/data/download/DownloadNotifier.kt

@@ -45,6 +45,17 @@ internal class DownloadNotifier(private val context: Context) {
         }
     }
 
+    private val cacheNotificationBuilder by lazy {
+        context.notificationBuilder(Notifications.CHANNEL_DOWNLOADER_CACHE) {
+            setSmallIcon(R.drawable.ic_tachi)
+            setContentTitle(context.getString(R.string.download_notifier_cache_renewal))
+            setProgress(100, 100, true)
+            setOngoing(true)
+            setAutoCancel(false)
+            setOnlyAlertOnce(true)
+        }
+    }
+
     /**
      * Status of download. Used for correct notification icon.
      */
@@ -233,4 +244,14 @@ internal class DownloadNotifier(private val context: Context) {
         errorThrown = true
         isDownloading = false
     }
+
+    fun onCacheProgress() {
+        with(cacheNotificationBuilder) {
+            show(Notifications.ID_DOWNLOAD_CACHE)
+        }
+    }
+
+    fun dismissCacheProgress() {
+        context.notificationManager.cancel(Notifications.ID_DOWNLOAD_CACHE)
+    }
 }

app/src/main/java/eu/kanade/tachiyomi/data/notification/Notifications.kt

@@ -42,6 +42,8 @@ object Notifications {
     const val ID_DOWNLOAD_CHAPTER_COMPLETE = -203
     const val CHANNEL_DOWNLOADER_ERROR = "downloader_error_channel"
     const val ID_DOWNLOAD_CHAPTER_ERROR = -202
+    const val CHANNEL_DOWNLOADER_CACHE = "downloader_cache_renewal"
+    const val ID_DOWNLOAD_CACHE = -204
 
     /**
      * Notification channel and ids used by the library updater.
@@ -159,6 +161,11 @@ object Notifications {
                     setGroup(GROUP_DOWNLOADER)
                     setShowBadge(false)
                 },
+                buildNotificationChannel(CHANNEL_DOWNLOADER_CACHE, IMPORTANCE_LOW) {
+                    setName(context.getString(R.string.channel_downloader_cache))
+                    setGroup(GROUP_DOWNLOADER)
+                    setShowBadge(false)
+                },
                 buildNotificationChannel(CHANNEL_BACKUP_RESTORE_PROGRESS, IMPORTANCE_LOW) {
                     setName(context.getString(R.string.channel_progress))
                     setGroup(GROUP_BACKUP_RESTORE)

i18n/src/main/res/values/strings.xml

@@ -863,6 +863,7 @@
     <string name="download_notifier_split_page_not_found">Page %d not found while splitting</string>
     <string name="download_notifier_split_page_path_not_found">Couldn\'t find file path of page %d</string>
     <string name="download_notifier_split_failed">Couldn\'t split downloaded image</string>
+    <string name="download_notifier_cache_renewal">Indexing downloads</string>
 
     <!-- Notification channels -->
     <string name="channel_common">Common</string>
@@ -873,6 +874,7 @@
     <string name="channel_new_chapters">Chapter updates</string>
     <string name="channel_app_updates">App updates</string>
     <string name="channel_ext_updates">Extension updates</string>
+    <string name="channel_downloader_cache">Download cache</string>
     <string name="channel_crash_logs">Crash logs</string>
 
     <!-- S Pen actions -->