Improve notification grouping for new streams.

app/src/main/java/com/github/libretube/ui/activities/MainActivity.kt

@@ -384,7 +384,7 @@ class MainActivity : BaseActivity() {
         intent?.getStringExtra(IntentData.channelId)?.let {
             navController.navigate(
                 R.id.channelFragment,
-                bundleOf(IntentData.channelName to it)
+                bundleOf(IntentData.channelId to it)
             )
         }
         intent?.getStringExtra(IntentData.channelName)?.let {

app/src/main/java/com/github/libretube/workers/NotificationWorker.kt

@@ -13,6 +13,7 @@ import androidx.work.CoroutineWorker
 import androidx.work.WorkerParameters
 import com.github.libretube.R
 import com.github.libretube.api.SubscriptionHelper
+import com.github.libretube.api.obj.StreamItem
 import com.github.libretube.constants.DOWNLOAD_PROGRESS_NOTIFICATION_ID
 import com.github.libretube.constants.IntentData
 import com.github.libretube.constants.PUSH_CHANNEL_ID
@@ -118,22 +119,8 @@ class NotificationWorker(appContext: Context, parameters: WorkerParameters) :
         Log.d(TAG(), "Create notifications for new videos")
 
         // create a notification for each new stream
-        channelGroups.forEach { (_, streams) ->
-            createNotification(
-                group = streams.first().uploaderUrl!!.toID(),
-                title = streams.first().uploaderName.toString(),
-                urlPath = streams.first().uploaderUrl!!,
-                isGroupSummary = true
-            )
-
-            streams.forEach { streamItem ->
-                createNotification(
-                    title = streamItem.title.toString(),
-                    description = streamItem.uploaderName.toString(),
-                    urlPath = streamItem.url!!,
-                    group = streamItem.uploaderUrl!!.toID()
-                )
-            }
+        channelGroups.forEach { (uploaderUrl, streams) ->
+            createNotificationsForChannel(uploaderUrl!!, streams)
         }
         // save the latest streams that got notified about
         PreferenceHelper.setLatestVideoId(videoFeed.first().url!!.toID())
@@ -142,46 +129,66 @@ class NotificationWorker(appContext: Context, parameters: WorkerParameters) :
     }
 
     /**
-     * Notification that is created when new streams are found
+     * Group of notifications created when new streams are found in a given channel.
+     *
+     * For more information, see https://developer.android.com/develop/ui/views/notifications/group
      */
-    private fun createNotification(
-        title: String,
-        group: String,
-        urlPath: String,
-        description: String? = null,
-        isGroupSummary: Boolean = false
-    ) {
-        // increase the notification ID to guarantee uniqueness
-        notificationId += 1
+    private fun createNotificationsForChannel(group: String, streams: List<StreamItem>) {
+        val intentFlags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK or
+            Intent.FLAG_ACTIVITY_CLEAR_TASK
 
-        val intent = Intent(applicationContext, MainActivity::class.java).apply {
-            flags = Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
-            if (isGroupSummary) {
-                putExtra(IntentData.channelId, urlPath.toID())
-            } else {
-                putExtra(IntentData.videoId, urlPath.toID())
-            }
+        // Create stream notifications. These are automatically grouped on Android 7.0 and later.
+        streams.forEach {
+            val intent = Intent(applicationContext, MainActivity::class.java)
+                .setFlags(intentFlags)
+                .putExtra(IntentData.videoId, it.url!!.toID())
+            val code = ++notificationId
+            val pendingIntent = PendingIntentCompat
+                .getActivity(applicationContext, code, intent, FLAG_UPDATE_CURRENT, false)
+
+            val notification = createNotificationBuilder(group)
+                .setContentTitle(it.title)
+                .setContentText(it.uploaderName)
+                // The intent that will fire when the user taps the notification
+                .setContentIntent(pendingIntent)
+                .build()
+
+            notificationManager.notify(code, notification)
         }
 
+        val summaryId = ++notificationId
+
+        val intent = Intent(applicationContext, MainActivity::class.java)
+            .setFlags(intentFlags)
+            .putExtra(IntentData.channelId, group.toID())
+
         val pendingIntent = PendingIntentCompat
-            .getActivity(applicationContext, notificationId, intent, FLAG_UPDATE_CURRENT, false)
+            .getActivity(applicationContext, summaryId, intent, FLAG_UPDATE_CURRENT, false)
 
-        val builder = NotificationCompat.Builder(applicationContext, PUSH_CHANNEL_ID)
-            .setContentTitle(title)
-            .setGroup(group)
-            .setSmallIcon(R.drawable.ic_launcher_lockscreen)
-            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+        // Create summary notification containing new streams for Android versions below 7.0.
+        val newStreams = applicationContext.resources
+            .getQuantityString(R.plurals.channel_new_streams, streams.size, streams.size)
+        val summary = NotificationCompat.InboxStyle()
+        streams.forEach {
+            summary.addLine(it.title)
+        }
+        val summaryNotification = createNotificationBuilder(group)
+            .setContentTitle(streams[0].uploaderName)
+            .setContentText(newStreams)
             // The intent that will fire when the user taps the notification
             .setContentIntent(pendingIntent)
+            .setGroupSummary(true)
+            .setStyle(summary)
+            .build()
+
+        notificationManager.notify(summaryId, summaryNotification)
+    }
+
+    private fun createNotificationBuilder(group: String): NotificationCompat.Builder {
+        return NotificationCompat.Builder(applicationContext, PUSH_CHANNEL_ID)
+            .setSmallIcon(R.drawable.ic_launcher_lockscreen)
+            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
             .setAutoCancel(true)
-
-        if (isGroupSummary) {
-            builder.setGroupSummary(true)
-        } else {
-            builder.setContentText(description)
-        }
-
-        // [notificationId] is a unique int for each notification that you must define
-        notificationManager.notify(notificationId, builder.build())
+            .setGroup(group)
     }
 }

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

@@ -485,4 +485,8 @@
         <item quantity="one">%d week ago</item>
         <item quantity="other">%d weeks ago</item>
     </plurals>
+    <plurals name="channel_new_streams">
+        <item quantity="one">%d new stream</item>
+        <item quantity="other">%d new streams</item>
+    </plurals>
 </resources>