Rich Android Notifications @waliahimanshu 

Topics • Why Use? • Types of notifications • API Behaviour changes • Best practices & Pitfalls 

Why ? Decrease in mindshare Growth, engagement and retention 1 2 

Types of notification Transactional Non-transactional 1.opt-out 2.opt-in 

Types of notification Non-transactional •opt-out •Opt-in 

API Behaviour changes 

Android 5 L setPriority() setVisibility() 

•Inline replies from notification tray •Bundling •Support for Custom notifications •areNotificationsEnabled() Android 7 N 

Inline replies Android N 7 Notification<— Action <—RemoteInput val remoteInput = RemoteInput.Builder(EXTRA_COMMENT) .setLabel(replyLabel) .build() val replyAction: Action = NotificationCompat.Action.Builder( R.drawable.ic_reply_white_18dp, replyLabel, pendingIntent) .addRemoteInput(remoteInput) .setAllowGeneratedReplies(true) .build() notificationCompatBuilder .addAction(replyAction) 

Inline replies Android N 7 Action Pending intent ? •Activity •Service or BroadcastReceiver 

Android N 7 Updating your notification val messagingStyle = NotificationCompat.MessagingStyle.extractMessagingStyleFromNotification( notification) // Add new message. messagingStyle.addMessage(replyCharSequence, currentTimeMillis(), null as Person?) // Updates and push Notification // Updates and pushes active Notification val updatedNotification = notificationCompatBuilder // Adds a line and comment below content in Notification .setRemoteInputHistory(arrayOf(comment)) .build() 

Android N 7 Bundling builder.setGroup(groupKey) builder.setGroupAlertBehavior(NotificationCompat.GROUP_ALERT_SUMMARY) builder.setGroup(groupKey) builder.setGroupSummary(true) builder.setGroupAlertBehavior(NotificationCompat.GROUP_ALERT_SUMMARY) Summary Notification 

Android N 7 •DecoratedCustomViewStyle •DecoratedMediaCustomViewStyle Support for custom notifications 

•Channels •Changing channel settings -> Prohibited •Deleting & re-creating -> Revealed Android O 8 •Channel groups 

Channel off? getNotificationChannel()/getNotificationChannels() getSound(),getVibration() and getImportance() getImportance() == IMPORTANCE_NONE // O isBlocked () // added in P Android O 8 

Notification badge Android O 8 

Android O 8 •Time-out for notification (setTimeoutAfter(long)) •setColorized() •setByPassDnd() 

sender = Person.Builder() .setName("Me MacDonald") .setKey("1234567890") .setUri(“tel:1234567890") .setBot(true) .setIcon(IconCompat.createWithResource(context, R.drawable.me_macdonald)) .build() NotificationCompat.MessagingStyle(sender) .addMessage("Check this out!", Date().time, sender) .setBuilder(notificationBuilder) Android P 9 val message = Notification.MessagingStyle.Message(message, time, sender) .setData("image/", imageUri) Focus on display 

val messagingStyle = MessagingStyle(messagingStyleCommsAppData.m .setConversationTitle("Group title") .setGroupConversation(true) Android P 9 

Android 10 API 29 val remoteInput = RemoteInput.Builder(BigPictureSocialIntentService.EXTRA_COMMENT) .setLabel(replyLabel) // List of quick response choices from ML // .setChoices(possiblePostResponses) .build() val replyAction = NotificationCompat.Action.Builder( R.drawable.ic_reply_white_18dp, replyLabel, replyActionPendingIntent) .addRemoteInput(remoteInput) .setAllowGeneratedReplies(true) .build() // Adds additional actions specified above. .addAction(replyAction) .setAllowSystemGeneratedContextualActions(true) Smart Replies 

Smart reply and media style 

Android 10 API 29

Android 10 API 29 Bubbles (preview) 

Best practices 

•Segment your users •Take the time of day into account •Actionable •Group and Prioritise 

•In-App’s settings screen •Handle failure scenarios •Cancel notifications on sign-out 

Pitfalls 

•Don’t try this at home……test…ing Pitfalls •Do not use distinct small icon •Abuse notificationsEnabled() 

•Notification icon (consider dark mode) •Avoid Custom view for notifications •large_icon 64dp * 64dp •big_picture 284dp * 416dp Pitfalls 

Pitfalls •One channel •Avoid notification fatigue (Digital wellbeing) 

Thank You 

Extra / Bonus 

Priority Order 

Notification styles Big TextStyle Big PictureStyle 

Notification styles Inbox Style Message Style Media Style 

Building notification val builder = NotificationCompat.Builder(this, notificationChannelId).apply { setSmallIcon(R.drawable.ic_launcher) .setContentTitle("title") .setContentText("text") } 

Building notification .setContentIntent(notifyPendingIntent) .setColor(R.color.colorPrimary)) .addAction(snoozeAction) .addAction(dismissAction) 

Android N 7/25 Bundling