SimpleNFC
SimpleNFC is a project which include insanely easy way of reading NFC data
Tech
SimpleNFC uses a number of open source lib to work properly:
- [RXJava] - Reactive Extensions for the JVM
- [RXAndroid] - Reactive Extensions for Android
Integrate for custom projects
Implement NFCInterface
public class MainActivity extends Activity implements NFCInterface{
....Create Subscription local variable
private Subscription nfcSubscription;Fill the implemented methods
@Override
protected void onResume() {
super.onResume();
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter filter = new IntentFilter();
filter.addAction(NfcAdapter.ACTION_TAG_DISCOVERED);
filter.addAction(NfcAdapter.ACTION_NDEF_DISCOVERED);
filter.addAction(NfcAdapter.ACTION_TECH_DISCOVERED);
NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
nfcAdapter.enableForegroundDispatch(this, pendingIntent, new IntentFilter[]{filter}, this.techList);
}
@Override
protected void onPause() {
super.onPause();
// disabling foreground dispatch:
NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
nfcAdapter.disableForegroundDispatch(this);
}
@Override
protected void onNewIntent(Intent intent) {
if (intent.getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED)) {
String type = intent.getType();
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
nfcReader(tag);
}
}
@Override
public String nfcRead(Tag t) {
try {
Tag tag = t;
Ndef ndef = Ndef.get(tag);
if (ndef == null) {
return null;
}
NdefMessage ndefMessage = ndef.getCachedNdefMessage();
NdefRecord[] records = ndefMessage.getRecords();
for (NdefRecord ndefRecord : records)
{
if (ndefRecord.getTnf() == NdefRecord.TNF_WELL_KNOWN && Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_TEXT))
{
try {return readText(ndefRecord);} catch (UnsupportedEncodingException e) {}
}
}
}
catch (Exception e)
{
return null;
}
return null;
}
@Override
public String readText(NdefRecord record) throws UnsupportedEncodingException {
byte[] payload = record.getPayload();
String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16";
int languageCodeLength = payload[0] & 0063;
return new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
}
@Override
public void nfcReader(Tag tag) {
nfcSubscription= Observable.just(nfcRead(tag))
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Observer<String>() {
@Override
public void onCompleted() {
}
@Override
public void onError(Throwable e) {
}
@Override
public void onNext(String s) {
if (s != null) {
txtNFCID.setText(s);
}
}
});
}Define onDestroy and unsubscribe on that
@Override
protected void onDestroy() {
super.onDestroy();
unsubscribe(nfcSubscription);
}
private static void unsubscribe(Subscription subscription) {
if (subscription != null && !subscription.isUnsubscribed()) {
subscription.unsubscribe();
subscription = null;
}
}