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From: Johannes Zweng <johannes@zweng.at>
Date: Fri, 7 Mar 2014 10:26:03 +0100
Message-ID: <CAJoe_wFeyFvxbd2nSD2yztJ_qjRQ=AKZj8pBOXs-ChKKbaZeuQ@mail.gmail.com>
To: Andreas Schildbach <andreas@schildbach.de>
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Cc: bitcoin-development@lists.sourceforge.net
Subject: Re: [Bitcoin-development] Instant / contactless payments
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Reply-To: johannes@zweng.at

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2014-03-06 12:26 GMT+01:00 Andreas Schildbach <andreas@schildbach.de>:


> In current phone implementations, the screen must be on already for NFC
> to be active. Also it must be unlocked, although I certainly hope future
> OSes will allow payment apps on the lock screen, just like they allow
> music players.


Just a small input to this point:
On Android 4.4 the new host card emulation (HCE) feature (aka: the phone
emulates a ISO-DEP Smartcard and processes ISO7816-4 APDU commands like a
Smartcard would do) only works when the display is on, but even when the
screen is locked (can be changed with "android:requireDeviceUnlock" in
Manifest). See here for detailled specification:
http://developer.android.com/guide/topics/connectivity/nfc/hce.html

Using the HCE API on Android 4.4 also has the beauty that any app that
registers itself for HCE and sets its category to CATEGORY_PAYMENT in the
Manifest automatically shows up in Adroid's system settings under "Tap &
Pay" (where a user would expect payment applications).

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<div dir=3D"ltr"><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">=
2014-03-06 12:26 GMT+01:00 Andreas Schildbach <span dir=3D"ltr">&lt;<a href=
=3D"mailto:andreas@schildbach.de" target=3D"_blank">andreas@schildbach.de</=
a>&gt;</span>:<br>


<div>=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left=
-style:solid;padding-left:1ex">In current phone implementations, the screen=
 must be on already for NFC<br>


to be active. Also it must be unlocked, although I certainly hope future<br=
>
OSes will allow payment apps on the lock screen, just like they allow<br>
music players.</blockquote><div><br></div><div>Just a small input to this p=
oint:</div><div>On Android 4.4 the new host card emulation (HCE) feature (a=
ka: the phone emulates a ISO-DEP Smartcard and processes=A0ISO7816-4 APDU c=
ommands like a Smartcard would do) only works when the display is on, but e=
ven when the screen is locked (can be changed with &quot;android:requireDev=
iceUnlock&quot; in Manifest). See here for detailled specification:=A0<a hr=
ef=3D"http://developer.android.com/guide/topics/connectivity/nfc/hce.html" =
target=3D"_blank">http://developer.android.com/guide/topics/connectivity/nf=
c/hce.html</a></div>


<div><br></div><div>Using the HCE API on Android 4.4 also has the beauty th=
at any app that registers itself for HCE and sets its category to CATEGORY_=
PAYMENT in the Manifest automatically shows up in Adroid&#39;s system setti=
ngs under &quot;Tap &amp; Pay&quot; (where a user would expect payment appl=
ications).</div>


<div><br></div><div><br></div></div></div></div>

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