Notification not Showing from Service

Question

I searched many other questions related to this topic but found not satisfactory answer also none of them are working for me. I want to show a continuous notification which should only be terminated by app. But the code i wrote was working a few days ago but not now.

private void GenNotification(String title, String body)
    {
        try
        {
            Log.i(Config.TAGWorker, "Generating Notification . . .");
            Intent myIntent = new Intent(this, MainActivity.class);
            PendingIntent pendingIntent = PendingIntent.getActivity(
                    this,
                    0,
                    myIntent,
                    PendingIntent.FLAG_UPDATE_CURRENT);

            Notification notification = new NotificationCompat.Builder(this)
                    .setContentTitle(title)
                    .setContentText(body)
                    .setChannelId("myID")
                    .setTicker("Notification!")
                    .setWhen(System.currentTimeMillis())
                    .setContentIntent(pendingIntent)
                    .setDefaults(Notification.DEFAULT_SOUND)
                    .setAutoCancel(false)
                    .setSmallIcon(R.drawable.floppy)
                    .setOngoing(true)
                    .build();
            NotificationManager mNotificationManager = (NotificationManager) getSystemService(Service.NOTIFICATION_SERVICE);
            mNotificationManager.notify(1, notification);
        }
        catch (Exception e)
        {
            Log.e(Config.TAGWorker, e.getMessage());
        }
    }

There is no exception recorded in Logcat, regarding ths. The code is called in onCreate of service. The service is starting correctly i can see in Log cat also there is no exception but notification is not shown. My OS is Android ONE for nokia (PI)

Answer 1

You are using a deprecated NotificationCompat.Builder constructor which takes a single argument (context); and that won't work on starting from Android 8.0 (API level 26).

So, to solve this:

Step 1: Create a Notification channel with the NotificationManager

NotificationManager mNotificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

// Notification channels are only available in OREO and higher.
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {

    NotificationChannel notificationChannel = new NotificationChannel
            ("PRIMARY_CHANNEL_ID",
                    "Service",
                    NotificationManager.IMPORTANCE_HIGH);

    notificationChannel.enableLights(true);
    notificationChannel.setLightColor(Color.RED);
    notificationChannel.enableVibration(true);
    notificationChannel.setDescription("Description");

    mNotificationManager.createNotificationChannel(notificationChannel);
}

Note: changeargument values as you wish

Step 2:: Use the non-deprecated Notification.Builder class with its two-argument constructor that takes a second argument as the channel ID which you assigned in the first step, where I set it to "PRIMARY_CHANNEL_ID"

Notification notification = new NotificationCompat.Builder
        (this, "PRIMARY_CHANNEL_ID")
        .setContentTitle("title")
        .setContentText("body")
        .setTicker("Notification!")
        .setWhen(System.currentTimeMillis())
        .setContentIntent(pendingIntent)
        .setSmallIcon(R.drawable.ic_launcher_background)
        .setPriority(NotificationCompat.PRIORITY_HIGH)
        .setOngoing(true)
        .setDefaults(NotificationCompat.DEFAULT_ALL)
        .setAutoCancel(true)
        .build();

mNotificationManager.notify(0, notification);

Answer 2

Did you check your strings (title and body) is not null if it's null notification wont show Also check that you call your notification channels when you start your service every time if your android above 7.0 Clear notification when you recall it same id in your case is 1.