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Starting in Android 8.0 (API level 26), all notifications must exist assigned to a channel. For each channel, you tin set the visual and auditory beliefs that is practical to all notifications in that channel. So, users tin can change these settings and decide which notification channels from your app should be intrusive or visible at all.

Bank check out the video below for an overview of channels and other new notification features in Android 8.0.

For sample code that uses notifications, including Android 8.0 features, see the Android Notifications Sample.

The user settings for notification channels are bachelor for each app in the system settings, as shown in effigy ane.

Figure 1. Notification settings for the Clock app and one of its channels

After you create a notification channel, you cannot alter the notification behaviors—the user has consummate control at that indicate. Though you lot tin can yet change a channel's name and description.

You should create a aqueduct for each singled-out type of notification yous need to send. You can also create notification channels to reverberate choices fabricated by users of your app. For example, you tin prepare divide notification channels for each conversation group created by a user in a messaging app.

When you target Android 8.0 (API level 26), you lot must implement one or more notification channels. If your targetSdkVersion is set up to 25 or lower, when your app runs on Android eight.0 (API level 26) or college, it behaves the same every bit it would on devices running Android seven.one (API level 25) or lower.

Create a notification channel

To create a notification aqueduct, follow these steps:

1. Construct a NotificationChannel object with a unique aqueduct ID, a user-visible proper noun, and an importance level.
2. Optionally, specify the description that the user sees in the organization settings with setDescription().
3. Register the notification channel by passing it to createNotificationChannel().

Kotlin

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {     // Create the NotificationChannel     val name = getString(R.string.channel_name)     val descriptionText = getString(R.string.channel_description)     val importance = NotificationManager.IMPORTANCE_DEFAULT     val mChannel = NotificationChannel(CHANNEL_ID, name, importance)     mChannel.description = descriptionText     // Register the channel with the system; you tin't alter the importance     // or other notification behaviors afterwards this     val notificationManager = getSystemService(NOTIFICATION_SERVICE) every bit NotificationManager     notificationManager.createNotificationChannel(mChannel) }            

Java

private void createNotificationChannel() {     // Create the NotificationChannel, but only on API 26+ because     // the NotificationChannel class is new and not in the back up library     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {         CharSequence name = getString(R.string.channel_name);         String description = getString(R.string.channel_description);         int importance = NotificationManager.IMPORTANCE_DEFAULT;         NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);         channel.setDescription(description);         // Register the channel with the arrangement; you can't change the importance         // or other notification behaviors after this         NotificationManager notificationManager = getSystemService(NotificationManager.class);         notificationManager.createNotificationChannel(channel);     } }            

Creating an existing notification channel with its original values performs no functioning, then it's safety to call this lawmaking when starting an app.

By default, all notifications posted to this aqueduct use the visual and auditory behaviors defined past the importance level from the NotificationManagerCompat class, such as IMPORTANCE_DEFAULT and IMPORTANCE_HIGH. (Run into beneath for more information about importance levels.)

If yous'd like to farther customize your channel'southward default notification behaviors, yous tin phone call methods such as enableLights(), setLightColor(), and setVibrationPattern() on the NotificationChannel. But recall that once you create the aqueduct, yous cannot modify these settings and the user has final control of whether these behaviors are active.

You lot tin can likewise create multiple notification channels in a unmarried operation by calling createNotificationChannels().

Gear up the importance level

Channel importance affects the interruption level of all notifications posted in the channel, and you must specify it in the NotificationChannel constructor. You tin can apply one of five importance levels, ranging from IMPORTANCE_NONE(0) to IMPORTANCE_HIGH(4). The importance level yous assign to a channel applies to all notification messages that you post to it.

To support devices running Android 7.1 (API level 25) or lower, you lot must as well telephone call setPriority() for each notification, using a priority constant from the NotificationCompat class.

The importance (NotificationManager.IMPORTANCE_*) and priority constants (NotificationCompat.PRIORITY_*) map to the user-visible importance options as indicated in table 1.

Table ane. Channel importance levels

User-visible importance level	Importance (Android 8.0 and higher)	Priority (Android 7.1 and lower)
Urgent Makes a audio and appears every bit a heads-up notification	IMPORTANCE_HIGH	PRIORITY_HIGH or PRIORITY_MAX
High Makes a sound	IMPORTANCE_DEFAULT	PRIORITY_DEFAULT
Medium No audio	IMPORTANCE_LOW	PRIORITY_LOW
Depression No sound and does not appear in the condition bar	IMPORTANCE_MIN	PRIORITY_MIN

All notifications, regardless of importance, appear in non-interruptive system UI locations, such every bit in the notification drawer and equally a badge on the launcher icon, though you tin modify the appearance of the notification badge.

Once you submit the channel to the NotificationManager, yous cannot change the importance level. Nevertheless, the user can change their preferences for your app's channels at any time.

For information almost choosing an appropriate priority level, see "Priority levels" in the Notifications design guide.

Read notification aqueduct settings

Users can modify the settings for notification channels, including behaviors such as vibration and warning sound. And so if you'd similar to know the settings a user has applied to your notification channels, follow these steps:

1. Get the NotificationChannel object by calling either getNotificationChannel() or getNotificationChannels().
2. Query specific channel settings such as getVibrationPattern(), getSound(), and getImportance().

Then, if you lot notice a channel setting that y'all believe inhibits the intended behavior for your app, y'all can suggest the user alter it and provide an action to open the aqueduct settings (run into the side by side section).

Open the notification aqueduct settings

After you create a notification aqueduct, you cannot change the notification aqueduct's visual and auditory behaviors programmatically—just the user can modify the channel behaviors from the system settings. To provide your users easy access to these notification settings, you should add an particular in your app's settings UI that opens these arrangement settings.

Y'all can open the arrangement settings for notification channels with an Intent that uses the ACTION_CHANNEL_NOTIFICATION_SETTINGS action.

For example, the following sample code shows how you lot can redirect a user to the settings for a notification channel:

Kotlin

val intent = Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS).apply {     putExtra(Settings.EXTRA_APP_PACKAGE, packageName)     putExtra(Settings.EXTRA_CHANNEL_ID, myNotificationChannel.getId()) } startActivity(intent)            

Java

Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS); intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName()); intent.putExtra(Settings.EXTRA_CHANNEL_ID, myNotificationChannel.getId()); startActivity(intent);            

Observe that the intent requires two extras that specify your app'southward package name (likewise known as the application ID) and the channel to edit.

Delete a notification channel

You tin can delete notification channels by calling deleteNotificationChannel(). The following sample code demonstrates how to consummate this process:

Kotlin

// The id of the channel. val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager val id: String = "my_channel_01" notificationManager.deleteNotificationChannel(id)            

Coffee

NotificationManager notificationManager =         (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE); // The id of the channel. Cord id = "my_channel_01"; notificationManager.deleteNotificationChannel(id);            

Create a notification aqueduct group

If you'd like to further organize the appearance of your channels in the settings UI, yous can create channel groups. This is a good idea when your app supports multiple user accounts (such as for piece of work profiles), so you tin can create a notification channel grouping for each account. This fashion, users tin easily identify and command multiple notification channels that have identical names.

Figure 2. Notification channel settings with groups for personal and piece of work accounts

For example, a social networking app might include support for personal and piece of work accounts. In this scenario, each account might require multiple notification channels with identical functions and names, such every bit the following:

• A personal business relationship with two channels:
  • New comments
  • Post recommendations
• A business account with two channels:
  • New comments
  • Mail recommendations

Organizing the notification channels into groups for each business relationship ensures that users can easily distinguish between them.

Each notification channel group requires an ID that must be unique within your package, likewise as a user-visible proper name. The following snippet demonstrates how to create a notification channel grouping.

Kotlin

// The id of the grouping. val groupId = "my_group_01" // The user-visible proper noun of the group. val groupName = getString(R.string.group_name) val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager              notificationManager.createNotificationChannelGroup(NotificationChannelGroup(groupId, groupName))            

Java

// The id of the group. String groupId = "my_group_01"; // The user-visible name of the group. CharSequence groupName = getString(R.string.group_name); NotificationManager notificationManager =         (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);              mNotificationManager.createNotificationChannelGroup(new NotificationChannelGroup(groupId, groupName));            

Subsequently you've created a new group, you can call setGroup() to associate a new NotificationChannel object with the group.

Once you submit the channel to the notification manager, you cannot change the association between notification channel and group.

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Source: https://developer.android.com/training/notify-user/channels

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