我尝试将ACR122集成到我的Andr​​oid应用程序。我使用了Android库（的http：// www.acs.com.hk/en/products/3/acr122u-usb-nfc-reader/ ）可从ACS。

I try to integrate an ACR122 to my android app. I'm using the ANDROID Library (http://www.acs.com.hk/en/products/3/acr122u-usb-nfc-reader/) available from ACS.

一切工作，我可检测卡的presence，但我想提取卡的UID / ID。有人知道函数来做到这一点？

Everything work, I can detect the presence of a card but I want to extract the UID/ID of the card. Someone know the function to do that?

你有这种类型的集成的例子吗？

Do you have an example of this type of integration?

推荐答案

在情况Mifare卡，你需要发送这个APDU字节数组卡：（字节）0xFF的，（字节）0xCA，（字节）为0x00，（字节）为0x00，（字节）×00。我不知道有关ACR122的API，但可能你需要用这个APDU到特定的API方法类似发射（）

In case of Mifare card you need to send this APDU byte array to the card: (byte) 0xFF, (byte) 0xCA, (byte) 0x00, (byte) 0x00, (byte) 0x00 . I'm not sure about ACR122 API but probably you need to wrap this APDU into specific API method like transmit()

更新

样品code：

 byte[] command = { (byte) 0xFF, (byte) 0xCA, (byte) 0x00, (byte) 0x00, (byte) 0x00 };
 byte[] response = new byte[300];
 int responseLength;
 responseLength = reader.transmit(slotNum, command, command.length, response,response.length);
 System.out.println(new String(response));

Reader是com.acs.smartcard.Reader对象 和slotNum是一个插槽号。我不知道如何找到它，因为我没有ACR测试。但是，如果你说，你是能够建立与读者基本的沟通也许你知道slotNum。

Reader is com.acs.smartcard.Reader object and slotNum is a the slot number. I’m not sure how to find it because I don’t have ACR to test. But if you told that you was able to establish basic communication with reader probably you know slotNum.