android - notification led doesn't work -

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notification.flags |= notification.flag_show_lights; notification.ledargb = color.blue; notification.ledonms = 1000;  notification.ledoffms = 1000;  notification.flags |= notification.flag_ongoing_event; notificationmanager.notify(notifyid, notification);

the code work in app, doesn't work in another. led doesn't flash.
answer appreciated.

sorry careless, reaseon 1 line code:

notification.defaults = notification.default_all;

it means setting, include light, sound, vibration, follow system setting.

because of this, code doesn't work. 

notification.flags |= notification.flag_show_lights; notification.ledargb = color.blue; notification.ledonms = 1000;  notification.ledoffms = 1000;

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