Notification doesn't play sound or show lights even though set to

In my android application I have the following code:

Notification notification = new Notification(icon, tickerText, when);

        context = context.getApplicationContext();
        CharSequence contentTitle = "UK Radio Guide";

        CharSequence contentText = title + " on " + channel_id + " at " + start;

        Intent notificationIntent = new Intent(context, ViewSchedules.class);
        PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notifi开发者_如何学编程cationIntent, 0);

        notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);

        notification.ledARGB = 0xff00ff00;
        notification.ledOnMS = 300;
        notification.ledOffMS = 1000;
        notification.flags |= Notification.FLAG_SHOW_LIGHTS;



        notification.sound = Uri.parse("android.resource://com.robinwilson.radioguide/" +R.raw.chimes);
        notification.vibrate = new long[] { 0, 300, 200, 300, 400, 300 };

        // Actually send the notification
        nm.notify(0, notification);

As far as I am aware, I have followed the steps in the documentation to set it to play a sound from the resources folder, and to flash the lights. However, neither of these happen. It does, however, vibrate, as instructed.

Any ideas what I'm doing wrong here? I've looked through the permissions that I can give the app in the AndroidManifest.xml file, but I can't see one for letting it flash the light or make sounds.

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I'm going to assume that you have

NotificationManager nm = ( NotificationManager ) getSystemService( NOTIFICATION_SERVICE );

I don't have an answer until I try but I had mine flash LED before. I'd suggest you try one piece at a time (LED/Sound/Vibration).