Android O - Single line Notification - like the “Android System - USB charging this device”

Question

I would like to have an ongoing notification for my ForegroundService that requires as small place as possible. I like the "Android System - USB charging t

Answer 1

You need to set the Notification priority to Min, the Notification Channel importance to Min, and disable showing the Notification Channel Badge.

Here's a sample of how I do it. I've included creating the full notification as well for reference

private static final int MYAPP_NOTIFICATION_ID= -793531;

NotificationManager notificationManager = (NotificationManager) context
        .getSystemService(Context.NOTIFICATION_SERVICE);

String CHANNEL_ID = "myapp_ongoing";
CharSequence name = context.getString(R.string.channel_name_ongoing);

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
    NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, NotificationManager.IMPORTANCE_MIN);
    channel.setShowBadge(false);

    notificationManager.createNotificationChannel(channel);
}

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
        context, CHANNEL_ID)
        .setSmallIcon(R.drawable.ic_stat_notification_add_reminder)
        .setContentTitle(context.getString(R.string.app_name))
        .setContentText(context.getString(R.string.create_new))
        .setOngoing(true).setWhen(0)
        .setChannelId(CHANNEL_ID)
        .setPriority(NotificationCompat.PRIORITY_MIN);

// Creates an intent for clicking on notification
Intent resultIntent = new Intent(context, MyActivity.class);
...

// The stack builder object will contain an artificial back stack
// for the
// started Activity.
// This ensures that navigating backward from the Activity leads out
// of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(MyActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(0,
        PendingIntent.FLAG_UPDATE_CURRENT);
mBuilder.setContentIntent(resultPendingIntent);

notificationManager.notify(MYAPP_NOTIFICATION_ID, mBuilder.build());