问题
Are there any existing libraries that will allow an Android tablet (4.0.4) without a NFC chip to interface with an external USB NFC reader/writer?
回答1:
Yes, the ACR 122 U can be connected via an USB OTG Cable. ACR has an Android test app on their driver page. You will in addition need something like NFC Tools for Java to interact with the reader (sending commands etc).
回答2:
Maybe default packages will help you. Otherwise you can look for any third-party libs
http://developer.android.com/reference/android/nfc/package-summary.html
or this may help you
How can I enable NFC reader via API?
回答3:
ACR 1222L reader has its android library.
http://android.acs.com.hk/
The documentation of these libraries can be found here:
http://www.acs.com.hk/download-driver-unified/5102/ACS-EVK-Android-112-A.zip
来源：https://stackoverflow.com/questions/15477526/android-library-api-for-nfc-reader-writers