Adjust update/download warnings

This is a partial revert/evolution of 538dd60580

- Back to notifications, because Android 12+ may cut off toasts
- Notifications now automatically dismiss after 30s on Android 8+ (taken from J2K)
- Also warn if more than 30 chapters are queued for download

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

@@ -184,16 +184,19 @@ internal class DownloadNotifier(private val context: Context) {
      * Called when the downloader receives a warning.
      *
      * @param reason the text to show.
+     * @param timeout duration after which to automatically dismiss the notification.
+     * Only works on Android 8+.
      */
-    fun onWarning(reason: String) {
+    fun onWarning(reason: String, timeout: Long? = null) {
         with(errorNotificationBuilder) {
             setContentTitle(context.getString(R.string.download_notifier_downloader_title))
-            setStyle(NotificationCompat.BigTextStyle().bigText(reason))
+            setContentText(reason)
             setSmallIcon(R.drawable.ic_warning_white_24dp)
             setAutoCancel(true)
             clearActions()
             setContentIntent(NotificationHandler.openDownloadManagerPendingActivity(context))
             setProgress(0, 0, false)
+            timeout?.let { setTimeoutAfter(it) }
 
             show(Notifications.ID_DOWNLOAD_CHAPTER_ERROR)
         }

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

@@ -2,7 +2,6 @@ package eu.kanade.tachiyomi.data.download
 
 import android.content.Context
 import android.webkit.MimeTypeMap
-import android.widget.Toast
 import com.hippo.unifile.UniFile
 import com.jakewharton.rxrelay.BehaviorRelay
 import com.jakewharton.rxrelay.PublishRelay
@@ -27,7 +26,6 @@ import eu.kanade.tachiyomi.util.storage.DiskUtil
 import eu.kanade.tachiyomi.util.storage.saveTo
 import eu.kanade.tachiyomi.util.system.ImageUtil
 import eu.kanade.tachiyomi.util.system.logcat
-import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.async
 import logcat.LogPriority
 import okhttp3.Response
@@ -274,13 +272,20 @@ class Downloader(
 
             // Start downloader if needed
             if (autoStart && wasEmpty) {
+                val queuedDownloads = queue.filter { it.source !is UnmeteredSource }.count()
                 val maxDownloadsFromSource = queue
                     .groupBy { it.source }
                     .filterKeys { it !is UnmeteredSource }
                     .maxOf { it.value.size }
-                if (maxDownloadsFromSource > CHAPTERS_PER_SOURCE_QUEUE_WARNING_THRESHOLD) {
+                if (
+                    queuedDownloads > DOWNLOADS_QUEUED_WARNING_THRESHOLD ||
+                    maxDownloadsFromSource > CHAPTERS_PER_SOURCE_QUEUE_WARNING_THRESHOLD
+                ) {
                     withUIContext {
-                        context.toast(R.string.download_queue_size_warning, Toast.LENGTH_LONG)
+                        notifier.onWarning(
+                            context.getString(R.string.download_queue_size_warning),
+                            WARNING_NOTIF_TIMEOUT_MS,
+                        )
                     }
                 }
                 DownloadService.start(context)
@@ -559,7 +564,9 @@ class Downloader(
 
     companion object {
         const val TMP_DIR_SUFFIX = "_tmp"
+        const val WARNING_NOTIF_TIMEOUT_MS = 30_000L
         const val CHAPTERS_PER_SOURCE_QUEUE_WARNING_THRESHOLD = 15
+        private const val DOWNLOADS_QUEUED_WARNING_THRESHOLD = 30
     }
 }