Re: [android-developers] NFC / Detecting another phone

On Mon, Aug 20, 2012 at 8:55 PM, Zoltán Páll <pallzoltan@gmail.com> wrote:
> Hello,
>
>
> There are many topics that describe how to work with tags, but I'm trying to
> only detect when another phone was put close to mine, even if it's not
> sending anything. Just switched on screen and tapped to mine. The system
> plays some sound, so it's somehow hooked somewhere, but I can't get an
> intent in my app.
>
>

There is no reliable way to do this. What are you trying do do?

A 'phone' can be anything: it can act as a card/tag if it is in card emulation
mode, or it can be sending you data in P2P mode. It can even be acting
as a reader and trying to read *your* device.

Generally, the Android NFC APIs are fairly high level, so you can't really
do whatever you want. You have to stick to the higher level abstractions:
reading a tag, NDEF push, Android Beam, etc.

>
> My app gets an intent when scanning a chip, but when putting another phone
> close, it only plays the sound (as if it failed, or as if it didn't have an
> app to handle the intent). Any idea how to do this? All I need is the event
> when someone puts an NFC chip/device in range.

It tries to start P2P and fails, hence the sound. TAG_DISCOVERED should
work as a general event, but for phones it will only work (maybe) if the device
is in card emulation mode. And, AFAIK, you can really disable the built-in
P2P logic (disabling Android Beam from Settings doesn't seem to do it), but
I haven't really looked into this.

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