1. NFC

2.  Near Filed Communication  Is a short range high frequency wireless communication technology  Low speed (106 to 424 kbps)  Low friction setup (no discovery, no pairing)  NFC is an extension of Radio frequency identification (RFID) technology - RFID is mainly used for tracking and identification by sending radio waves 2 What is NFC?

3. How NFC works? Use NFC to read information from a tag Use NFC to read peer to peer information

4. How NFC is used with Android?  NFC feature is available from Android 2.3 version  Android Ice Cream Sandwich 4.0 introduced a new peer-to-peer interaction model 0-click contact sharing 0-click web page sharing 0-click youtube video sharing

5. How to NFC? Reading NDEF data from an NFC tag = Nfc Data Exchange Format  By design, NDEF data is dispatched to only one activity  The type of the first NDEF record is used for dispatch  The data container format for NFC More on http://developer.android.com/reference/android/nfc/NdefMessage.html http://developer.android.com/reference/android/nfc/NdefRecord.html

6. Reading NDEF data Different Dispatch Types

7. Reading NDEF data  Android Manifest  Activity class onResume @Override protected void onResume() { … if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) { NdefMessage[] messages = getNdefMessages(getIntent()); byte[] payload = messages[0].getRecords()[0].getPayload(); … } How to use NFC reading within Java code

8. Writing NDEF data Writing NDEF tags String text; NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,"text/plain".getBytes(), text.getBytes()); NdefMessage textMessage = new NdefMessage(new NdefRecord[]{textRecord}); Tag tag = getIntent().getExtra(NfcAdapter.EXTRA_TAG); Ndef ndef = Ndef.get(tag); ndef.writeNdefMessage(textMessage);

9. Writing Peer to Peer  Foreground Activities can register an NDEF payload for P2P push Register the payload in advance adapter.enableForegroundNdefPush(this, ndefMessage);  Ice Cream Sandwich preview Register interest in P2P in advance, push the payload live public interface NdefPushCallback { public NdefMessage createMessage(); } adapter.registerForegroundNdefPush(this, callback); Writing NDEF data

10. Sources http://developer.android.com/guide/topics/connectivity/nfc/nfc.html#tag-dispatch http://static.googleusercontent.com/external_content/untrusted_dlcp/www.googl e.com/en//events/io/2011/static/presofiles/how_to_nfc.pdf http://www.jessechen.net/blog/how-to-nfc-on-the-android-platform/ http://developer.android.com/reference/android/nfc/package-summary.html

11. Questions & (hopefully) Answers String question = audience.getNextQuestion(); while (question != null && timeLeft.getValue() > 0) { try { answer(question); } catch (AnswerNotKnownException e) { MakeSomethingUp(); LOG.warn("Missed one: " + question, e); } question = audience.getNextQuestion(); timeLeft.update(); } audience.thankForAttention();