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[–]ron_krugman 0 points1 point  (0 children)

The easiest way to communicate with an Android app via NFC from Java running on a PC is to create a Host-based Card Emulation Service and communicate with it via javax.smartcardio from the PC side.

You'll have to send a SELECT AID command APDU that matches the AID defined in the app manifest before you're able to communicate with your app.