The document provides an overview of Near Field Communication (NFC), including its features, modes, and applications in Android development. It covers NFC's capabilities for short-range wireless communication, data exchange, and secure interactions. Additionally, it offers technical guidance on implementing NFC in Android applications, along with sample code and permissions required.

1. A new world is coming…
@fernando_cejas
www.fernandocejas.com

2. Who am I?
• Barcelona GDG Organizer
• NFC, Android and Agile Geek
• Android10.org
• NFC Actions App
• Flojack (@flomio)
• @fernando_cejas
• http://www.fernandocejas.com/

3. Agenda
• What is NFC?
• NFC Features and components
• Common (and not) use cases
• Android and NFC
• Android NFC Development
• Demo code
• Faq

4. What is Near Field Communication?
• Near Field Communication (NFC) is a global standard for
short-range wireless connectivity technology
• Driven by NFC Forum (http://www.nfc-forum.org) since
2004.
• 160 + members, including Google, Intel, Microsoft,
Nokia, NEC, Paypal, At&t, Visa, VTT.
• Promote N-Mark trademark as a universal symbol for
NFC.

5. Near Field Communication
Physical action, virtual reaction
In practice, NFC enables simple and safe
two-way interactions among electronic
devices within a close proximity.

6. NFC Features
• Short range technology
– Connection established when devices or tag close enough (5-10
cm)
– Simple setup (instant configuration)
• 2-way communication
– Not only reading like in contactless smart cards, but data exchange
• Passive tags
– No need for external power
– Low-price
• Security
– Support secure element
– Close proximity use brings some basic security

7. NFC Modes
• Read and write tags
• Peer-to-peer
• Card emulation
Android support:
– Read and write (excellent support)
– P2P (limited)

8. NFC Tags

9. How can NFC change the world?

10. NFC and Android
• Tag Reading: since Android 2.3 – API level 9
• Tag Writing: since Android 2.3.3 – API level 10
• Beam (P2P): Android ICS 4.0 – API level 14
Core Android classes:
– NFC Manager
– NFC Adapter
– Tag Technology classes

11. NFC Manager
• NFCManager used to get the NFCAdapter
• Boring
• Shortcut for
getSystemService(NFC_SERVICE)

12. NFC Adapter
• The real thing
• Control Foreground Dispatch and P2P
(Android Beam)
• Check if NFC is turned on

13. Android Manifest
• NFC Permission
<uses-permission android:name="android.permission.NFC" />
• API Level
<uses-sdk android:minSdkVersion="10" />
• NFC Feature
<uses-feature android:name="android.hardware.nfc" android:required="true" />

14. NDEF Messages
• NFC Data Exchange Format (NDEF)
• NFC Forum Standard

15. NFC Android Dyspatch System

16. Android Manifest
In AndroidManifest.xml (4.0+):
<manifest ...>
<uses-sdk android:minSdkVersion="10" />
<uses-feature android:name="android.hardware.nfc” android:required="true" />
<uses-permission android:name="android.permission.NFC" />
<application ...>
<activity ...>
<intent-filter>
<action android:name="android.nfc.action.NDEF_DISCOVERED"/>
<category android:name="android.intent.category.DEFAULT" />
<data android:mimeType="text/plain" /> //Could be custom
</intent-filter>
</activity>
</application>
</manifest>

17. Activity - Reacting to NFC scans
In the .java file for your Activity:
import android.nfc.NfcAdapter;
import android.nfc.NfcAdapter.CreateNdefMessageCallback;
import android.nfc.NfcEvent;
//...
NfcAdapter mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
Boolean nfcEnabled = mNfcAdapter.isEnabled();
//Give priority to the foreground activity to receive NFC scan intents.
mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent,
mReadTagFilters, null);
//Enable Android Beam for peer-to-peer
mNfcAdapter.setNdefPushMessageCallback(this,this);

18. Activity - Formatting to NDEF Format
In the .java file for your Activity:
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.tech.Ndef;
import android.nfc.tech.NdefFormatable;
//...
String data = “Hello NFC”;
// create a new NDEF record w/ NDEF message using the app's custom MIME type:
String mimeType = "application/root.gast.playground.nfc"; //unique to your app
byte[] mimeBytes = mimeType.getBytes(Charset.forName("UTF-8"));
byte[] dataBytes = data.getBytes(Charset.forName("UTF-8"));
byte[] id = new byte[0];
NdefRecord record = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
mimeBytes, id, dataBytes);
NdefMessage m = new NdefMessage(new NdefRecord[] { record });

19. Activity - Reading NDEF Format
In the .java file for your Activity: import android.nfc.Tag;
//...
Parcelable[] rawMsgs =
intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
NdefRecord record = msgs[0].getRecords()[0];
byte[] payload = record.getPayload(); //the info you wanted

20. Activity - Android Beam
In the .java file for your Activity:
//Implement the interface
public class BeamActivity extends Activity implements CreateNdefMessageCallback
// Register callback
mNfcAdapter.setNdefPushMessageCallback(this, this);
public NdefMessage createNdefMessage(NfcEvent event) {
String data = "Hello NFC”;
// create a new NDEF record and containing NDEF message:
String mimeType = "application/com.fernandocejas.example.android.nfc”;
byte[] mimeBytes = mimeType.getBytes(Charset.forName("UTF-8"));
byte[] dataBytes = data.getBytes(Charset.forName("UTF-8"));
byte[] id = new byte[0];
NdefRecord record = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
mimeBytes, id, dataBytes);
NdefMessage message = new NdefMessage(new NdefRecord[] { record });
return message;
}

21. Sample Application
https://github.com/android10

22. Mobile OS support for NFC

23. Any questions?

24. Thanks!
When you look at the dark side, careful you
must be ... for the dark side looks back.
@fernando_cejas
www.fernandocejas.com