blocks|key|1106121|text|使用Android+HCE模拟被检测为NDEF标签的标签并不像发送NDEF消息以响应SELECT+APDU那么简单。您需要实现NFC论坛类型4标签操作规范。您可以从NFC+Forum+website获得该规范。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1106122|基本上，您需要为AID+D2760000850101注册一个HCE服务，该服务实现了阅读器端用来访问Type4标签的几个APDU命令：|style|CODE|1106123|1106124|选择NDEF标签应用程序|unordered-list-item|1106125|1106126|00+A4+04+00+07+D2760000850101+00|1106127|选择功能容器|1106128|1106129|00+A4+00+0C+02+E103|1106130|选择NDEF数据文件|1106131|1106132|00+A4+00+0C+02+xxyy|1106133|其中，xxyy是在能力容器二进制文件中指定的NDEF数据文件的文件ID+(用于从能力容器或NDEF数据文件中读取数据，以当前选定的为准)|1106134|00+B0+xx+yy+zz|1106135|其中xx+yy是要读取的偏移量，zz是要读取的字节数。|1106136|重要提示:请注意，Android设备模拟的这种NFC论坛类型4标签不能用于在第二个Android设备上自动触发应用程序(至少不可靠？)。将两个Android设备放在一起通常会导致它们建立点对点链接(即使光束被关闭！)。只有第二个Android设备上的前台应用程序可以使用NFC+Reader模式API绕过Android光束，并可靠地检测模拟的标签。|1106137|entityMap|0|LINK|mutability|MUTABLE|url|http://www.nfc-forum.org/^0|2A|H|0|0|C|E|0|0|0|0|0|0|0|0|0|0|0|3|4|0|0|2|5|G|2|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]]|C|$]]|$1|D|3|E|5|6|7|1I|8|@$A|1J|B|1K|F|G]]|9|@]|C|$]]|$1|H|3|-4|5|6|7|1L|8|@]|9|@]|C|$]]|$1|I|3|J|5|K|7|1M|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|1N|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|1O|8|@]|9|@]|C|$]]|$1|O|3|P|5|K|7|1P|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|R|3|S|5|6|7|1R|8|@]|9|@]|C|$]]|$1|T|3|U|5|K|7|1S|8|@]|9|@]|C|$]]|$1|V|3|-4|5|6|7|1T|8|@]|9|@]|C|$]]|$1|W|3|X|5|6|7|1U|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|6|7|1V|8|@$A|1W|B|1X|F|G]]|9|@]|C|$]]|$1|10|3|11|5|6|7|1Y|8|@]|9|@]|C|$]]|$1|12|3|13|5|6|7|1Z|8|@$A|20|B|21|F|G]|$A|22|B|23|F|G]]|9|@]|C|$]]|$1|14|3|15|5|6|7|24|8|@]|9|@]|C|$]]|$1|16|3|-4|5|6|7|25|8|@]|9|@]|C|$]]]|17|$18|$5|19|1A|1B|C|$1C|1D]]]]

Emulating a tag that is detected as NDEF tag using Android HCE is not as simple as sending an NDEF message in response to a SELECT APDU. You would need to implement the NFC Forum Type 4 Tag Operation specification. You can get that specification from the <a href="http://www.nfc-forum.org/" rel="nofollow noreferrer">NFC Forum website</a>.

Basically you would need to register a HCE service for the AID <code>D2760000850101</code> that implements a couple of APDU commands that the reader-side uses to access a Type 4 tag:

<ul>
<li>SELECT NDEF tag application

<pre><code>00 A4 04 00 07 D2760000850101 [00]
</code></pre></li>
<li>SELECT capability container

<pre><code>00 A4 00 0C 02 E103
</code></pre></li>
<li>SELECT NDEF data file

<pre><code>00 A4 00 0C 02 xxyy
</code></pre>

Where <code>xxyy</code> is the file ID of the NDEF data file as specified in the capability container.</li>
<li>READ BINARY (for reading data from capability container or NDEF data file, whichever is currently selected)

<pre><code>00 B0 xx yy zz
</code></pre>

Where <code>xx yy</code> is the offset to read at and <code>zz</code> is the number of bytes to read.</li>
</ul>

Important note: Be aware that such an NFC Forum Type 4 tag emulated by an Android device cannot be used to automatically trigger an app on a second Android device (at least not reliably?). Putting two Android devices together will usually result in them establishing a peer-to-peer link (even if Beam is turned off!). Only a foreground app on the second Android device could use the NFC Reader mode API to bypass Android Beam and reliably detect the emulated tag.

blocks|key|784092|text|对于任何坚持这个问题的人，我读过@Michael+Roland提出的NFCForum-TS-Type-4-Tag。整个想法是正确的。您所需要做的就是模拟发送和接收命令的过程，将字节数组转换为NDEF消息。我创建了两个存储库，一个总结了整个包中关于将string转换为NDEF+message的内容，另一个是验证Android+HCE是否正确的iOS+Reader+NDEF+TAG。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|784093|所以祝你好运！|784094|entityMap|0|LINK|mutability|MUTABLE|url|http://apps4android.org/nfc-specifications/NFCForum-TS-Type-4-Tag_2.0.pdf|1|https://developer.android.com/reference/android/nfc/tech/Ndef|2|https://github.com/underwindfall/NFCAndroid|3|https://github.com/underwindfall/NFCReaderiOS^0|Y|M|0|2N|4|1|3P|C|2|4R|J|3|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]|$A|10|B|11|1|12]|$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]|P|$5|I|J|K|C|$L|Q]]|R|$5|I|J|K|C|$L|S]]]]

For anyone who stuck on this issue, I have read <a href="http://apps4android.org/nfc-specifications/NFCForum-TS-Type-4-Tag_2.0.pdf" rel="noreferrer">NFCForum-TS-Type-4-Tag</a> which proposed by @Michael Roland. The whole idea is correct. All you need is to simulate the process SEND and RECEIVED commands to convert the byte array to a <a href="https://developer.android.com/reference/android/nfc/tech/Ndef" rel="noreferrer">NDEF</a> message. I created two repositories, one conclude the whole package about converting string to a <a href="https://github.com/underwindfall/NFCAndroid" rel="noreferrer">NDEF message</a> and the other one is a <a href="https://github.com/underwindfall/NFCReaderiOS" rel="noreferrer">iOS Reader NDEF TAG</a> to verify whether Android HCE is correct or not.

So Good luck!

I wanna emulate a host card with the HCE feature from Android. For that I extend the service class HostApduService and overwrite following method:

<pre><code> public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {
 if (Arrays.equals(SELECT_APDU, commandApdu)) {
 NdefMessage message = new NdefMessage(new NdefRecord [] {NdefRecord.createTextRecord("en", "test"});
 return message.toByteArray();
 } else {
 return UNKNOWN_CMD_SW;
 }
}
</code></pre>

With a second device its possible to receive data from the HCE Service. The problem is that I always receive "Type A" Tag, but I need a NDEF Message. 

Can anybody help me?

NDEF Message with HCE Android

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想用Android的HCE功能来模拟一个主机卡。为此，我扩展了服务类HostApduService并覆盖了以下方法： public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {    if (Arrays.equals(SELECT_AP...

问使用HCE Android的NDEF消息
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