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Regular Contributor
Posts: 83
Registered: ‎12-09-2010
My Device: Not Specified

How to detect NFC cards when backlight is Off ?

Hello, I'm trying to detect Mifare Ultralight card when backlight is off but nothing happened.

 

I've tried on several devices (9360, 9900, 9790) with latest OS 7.0.0.585 but it doesn't works.

I've seen an option "allow NFC Card Transaction" :

- When Locked or Backlight is Off

- When powered off

 

But these options not seems to be take in considerations, maybe it's for other NFC Services?

 

How can I Do?

 

Thanks.

 

Developer
Posts: 178
Registered: ‎11-19-2008
My Device: Not Specified

Re: How to detect NFC cards when backlight is Off ?

Same problem here.

I solved it by implementing a Timer that keeps the light on, using Backlight.enable.

I wish there were a cleaner method via API to listen for NFC without caring about backlight.