Android system theme adding its own background to the icon of notification

Question

I've created a simple notification using NotificationCompat.
Following is my code

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mContext);
mBuilder.setSmallIcon(icon)
        .setTicker(title)
        .setWhen(0)
        .setAutoCancel(true)
        .setContentTitle(title)
        .setStyle(new NotificationCompat.InboxStyle())
        .setContentIntent(resultPendingIntent)
        .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))
        .setContentText(message);

NotificationManager notificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(mNotificationId, mBuilder.build());

Here is the output on my device.

My icon does not have the blue gradient background. The icon is a png that contains only the white USB symbol.
I'm suspecting that the background is being added by system.

Now my question is, how I can prevent this kind of modifications.

My device is running KitKat 4.4.4

score 2 · Accepted Answer · edited May 23 '17 at 11:52

If you do not specify a 'large' icon, the system displays the 'small' icon with a standard background, the blue gradient in your case.

You can set a custom image with setLargeIcon() where you can specify a Bitmap that is shown instead of the default icon. Note: The large icon should have a size of 64x64dp. Refer to this answer for a concrete example.

Since Android 5.0 you could alternatively use setColor() which will set the background color behind the icon. But that obviously won't work for you on Android 4.4.

Android system theme adding its own background to the icon of notification

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