Application icon badge not displayed Android

Question

For an assignment, I have to write an application which can display all contacts and their birthday date (& create / modify them). So far so good. Then, I have to fire a notification with all people who are born today.

The notification is launched without problem but I don't get the app icon badge.

After searching, I found out I have to use the channels -> done.

I've verified in the settings if the notification dot is enabled:

I've verified the android documentation saying "it's automatic you shoundn't have anything to do"

My simulator is using Android 9.0 which is greater than android oreo.

So what's wrong ?

public class BirthdayListener implements View.OnClickListener {
    private static final String CHANNEL_ID = "ch.hefr.tic.birthday_channel";
    private static final int SUMMARY_ID = -1;
    private static final String GROUP_KEY = "ch.hefr.tic.group_channel";

    private Context context;
    private NotificationManager notificationManager;

    public BirthdayListener(Context context) {
        this.context = context;

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            CharSequence name = context.getResources().getString(R.string.channel_name);
            String description = context.getResources().getString(R.string.channel_description);
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
            channel.setDescription(description);
            channel.setShowBadge(true);
            notificationManager = context.getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);
        }
    }

    @Override
    public void onClick(View v) {
        List<Contact> hasBirthday = searchBirthdays();

        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(context);

        NotificationCompat.InboxStyle summaryStyle = new NotificationCompat.InboxStyle();
        summaryStyle.setBigContentTitle(hasBirthday.size() + " new messages");

        for(int i = 0; i < hasBirthday.size(); ++i) {
            Contact contact = hasBirthday.get(i);

            NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
                    .setSmallIcon(R.mipmap.ic_notification)
                    .setContentTitle("Birthday")
                    .setContentText(contact.getName() + " has his birthday today !")
                    .setPriority(NotificationCompat.PRIORITY_DEFAULT)
                    .setGroup(GROUP_KEY)
                    .setNumber(5);

            String phoneNumber = contact.getPhoneNumber();
            if(phoneNumber != null && !phoneNumber.equals("")) {
                Intent smsIntent = new Intent(Intent.ACTION_VIEW);
                smsIntent.setData(Uri.parse("sms:" + phoneNumber));

                PendingIntent pending = PendingIntent.getActivity(context, 0, smsIntent, 0);
                builder.addAction(R.drawable.ic_arrow_back, "SMS", pending);
            }

            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
                notificationManagerCompat.notify(i, builder.build());
            else
                notificationManager.notify(i, builder.build());
        }

        NotificationCompat.Builder summaryBuilder = new NotificationCompat.Builder(context, CHANNEL_ID)
                .setSmallIcon(R.mipmap.ic_notification)
                .setContentTitle("Today Birthdays")
                .setContentText(hasBirthday.size() + " new messages")
                .setStyle(summaryStyle)
                .setGroup(GROUP_KEY)
                .setGroupSummary(true)
                .setNumber(5);

        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O)
            notificationManagerCompat.notify(SUMMARY_ID, summaryBuilder.build());
        else
            notificationManager.notify(SUMMARY_ID, summaryBuilder.build());
    }
}

Edit : tried to use the setColor on NotificationCompat.Builder builder but it changes the color of the icon. Still don't have any badge.

Answer 1

Thanks to Bob and his link : https://support.google.com/pixelphone/thread/1575301?hl=en, I found out I had to go to settings < apps and notifications < special app access < notifications < notification access < turn on for "pixel launcher". Then the notification dots would appear as expected !

Well time to write my report I guess.