Display light on Notification fired

I want to display light when notification fires in android

i have try with below code but the screen not displays light

if(isBlink) {
        notification.ledOffMS=25; 
        notification.ledOnMS=开发者_开发技巧100;   
        notification.ledARGB=Color.RED; 
        notification.flags=notification.flags|Notification.FLAG_SHOW_LIGHTS;
}

I am not sure about your code and logic inside. But following questions may help you to debug.

1. How do you trigger isBlink ? Is this through some signal handler ?

2. How notification parameters gets acknowledged once set ? I suppose you are using some timer or loop logic.

Try to receive this notification with the screen off.. I think google have this requirement to show lights on the led.