what is notification channel id?notifications not work in api 27


I updated my project api target to 27 and all notifications were disabled.
What's the difference between notification in api 26 and 27?

        Notification notif = new NotificationCompat.Builder(this)
        notif.ledARGB = 0xFFff0000;
        notif.flags = Notification.FLAG_SHOW_LIGHTS;
        notif.ledOnMS = 100;
        notif.ledOffMS = 100;

        NotificationManager notificationCompatManager =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        notificationCompatManager.notify(0, notif);
asked on Stack Overflow Nov 21, 2017 by AmirHossein Teymoori • edited Nov 21, 2017 by Phantômaxx

1 Answer


As stated in the Android developers website:

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

So You can use this method to show notification in both -27 and +27 apis :

Java :

    void showNotification(String title, String message) {
    NotificationManager mNotificationManager =
            (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        NotificationChannel channel = new NotificationChannel("YOUR_CHANNEL_ID",
    NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(getApplicationContext(), "YOUR_CHANNEL_ID")
            .setSmallIcon(R.mipmap.ic_launcher) // notification icon
            .setContentTitle(title) // title for notification
            .setContentText(message)// message for notification
            .setAutoCancel(true); // clear notification after click
    Intent intent = new Intent(getApplicationContext(), ACTIVITY_NAME.class);
    PendingIntent pi = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
    mNotificationManager.notify(0, mBuilder.build());

Kotlin :

fun showNotification(title: String, message: String) {
    val mNotificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        val channel = NotificationChannel("YOUR_CHANNEL_ID",
        channel.description = "YOUR_NOTIFICATION_CHANNEL_DESCRIPTION"
    val mBuilder = NotificationCompat.Builder(applicationContext, "YOUR_CHANNEL_ID")
            .setSmallIcon(R.mipmap.ic_launcher) // notification icon
            .setContentTitle(title) // title for notification
            .setContentText(message)// message for notification
            .setAutoCancel(true) // clear notification after click
    val intent = Intent(applicationContext, ACTIVITY_NAME::class.java)
    val pi = PendingIntent.getActivity(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)
    mNotificationManager.notify(0, mBuilder.build())

Note: If you want to show heads-up notification, you can set the importance of your channel and your notification as HIGH, AND remove your app and install it again.

answered on Stack Overflow Nov 21, 2017 by Pouya Heydari • edited May 31, 2020 by Pouya Heydari

User contributions licensed under CC BY-SA 3.0