/// <summary>
/// This method is called when an NFC tag is discovered by the application.
/// </summary>
/// <param name="intent"></param>
protected override void OnNewIntent(Intent intent)
{
if (_inWriteMode)
{
_inWriteMode = false;
var tag = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
if (tag == null)
{
return;
}
// These next few lines will create a payload (consisting of a string)
// and a mimetype. NFC record are arrays of bytes.
//var payload = Encoding.ASCII.GetBytes(GetRandomHominid());
//var mimeBytes = Encoding.ASCII.GetBytes(ViewApeMimeType);
//var apeRecord = new NdefRecord(NdefRecord.TnfMimeMedia, mimeBytes, new byte[0], payload);
var nd = NdefRecord.CreateTextRecord(null, "Hello Test");
var ndefMessage = new NdefMessage(new[] { nd });
if (!TryAndWriteToTag(tag, ndefMessage))
{
// Maybe the write couldn't happen because the tag wasn't formatted?
TryAndFormatTagWithMessage(tag, ndefMessage);
}
}
}
public NdefMessage CreateNdefMessage(NfcEvent e)
{
NdefRecord txt = NdefRecord.CreateTextRecord("token", token);
NdefMessage message = new NdefMessage(new[] { txt });
return(message);
}
/// <summary>
/// Transforms a <see cref="NFCNdefRecord"/> into an Android <see cref="NdefRecord"/>
/// </summary>
/// <param name="record">Object <see cref="NFCNdefRecord"/></param>
/// <returns>Android <see cref="NdefRecord"/></returns>
NdefRecord GetAndroidNdefRecord(NFCNdefRecord record)
{
if (record == null)
{
return(null);
}
NdefRecord ndefRecord = null;
switch (record.TypeFormat)
{
case NFCNdefTypeFormat.WellKnown:
var languageCode = record.LanguageCode;
if (string.IsNullOrWhiteSpace(languageCode))
{
languageCode = Configuration.DefaultLanguageCode;
}
if (languageCode.Length > 5)
{
languageCode = languageCode.Substring(0, 5); //max support 5 chars like en-US or de-AT
}
ndefRecord = NdefRecord.CreateTextRecord(languageCode, Encoding.UTF8.GetString(record.Payload));
//no need to force it to 2 letters only
//ndefRecord = NdefRecord.CreateTextRecord(languageCode.Substring(0, 2), Encoding.UTF8.GetString(record.Payload));
break;
case NFCNdefTypeFormat.Mime:
ndefRecord = NdefRecord.CreateMime(record.MimeType, record.Payload);
break;
case NFCNdefTypeFormat.Uri:
ndefRecord = NdefRecord.CreateUri(Encoding.UTF8.GetString(record.Payload));
break;
case NFCNdefTypeFormat.External:
ndefRecord = NdefRecord.CreateExternal(record.ExternalDomain, record.ExternalType, record.Payload);
break;
case NFCNdefTypeFormat.Empty:
ndefRecord = GetEmptyNdefRecord();
break;
case NFCNdefTypeFormat.Unknown:
case NFCNdefTypeFormat.Unchanged:
case NFCNdefTypeFormat.Reserved:
default:
break;
}
return(ndefRecord);
}
/// <summary>
/// Transforms a <see cref="NFCNdefRecord"/> into an Android <see cref="NdefRecord"/>
/// </summary>
/// <param name="record">Object <see cref="NFCNdefRecord"/></param>
/// <returns>Android <see cref="NdefRecord"/></returns>
NdefRecord GetAndroidNdefRecord(NFCNdefRecord record)
{
if (record == null)
{
return(null);
}
NdefRecord ndefRecord = null;
switch (record.TypeFormat)
{
case NFCNdefTypeFormat.WellKnown:
var languageCode = record.LanguageCode;
if (string.IsNullOrWhiteSpace(languageCode))
{
languageCode = Configuration.DefaultLanguageCode;
}
ndefRecord = NdefRecord.CreateTextRecord(languageCode.Substring(0, 2), Encoding.UTF8.GetString(record.Payload));
break;
case NFCNdefTypeFormat.Mime:
ndefRecord = NdefRecord.CreateMime(record.MimeType, record.Payload);
break;
case NFCNdefTypeFormat.Uri:
ndefRecord = NdefRecord.CreateUri(Encoding.UTF8.GetString(record.Payload));
break;
case NFCNdefTypeFormat.External:
ndefRecord = NdefRecord.CreateExternal(record.ExternalDomain, record.ExternalType, record.Payload);
break;
case NFCNdefTypeFormat.Empty:
ndefRecord = GetEmptyNdefRecord();
break;
case NFCNdefTypeFormat.Unknown:
case NFCNdefTypeFormat.Unchanged:
case NFCNdefTypeFormat.Reserved:
default:
break;
}
return(ndefRecord);
}
/// <summary>
/// Transforms a <see cref="NFCNdefRecord"/> into an Android <see cref="NdefRecord"/>
/// </summary>
/// <param name="record">Object <see cref="NFCNdefRecord"/></param>
/// <returns>Android <see cref="NdefRecord"/></returns>
NdefRecord GetAndroidNdefRecord(NFCNdefRecord record)
{
if (record == null)
{
return(null);
}
NdefRecord ndefRecord = null;
switch (record.TypeFormat)
{
case NFCNdefTypeFormat.WellKnown:
ndefRecord = NdefRecord.CreateTextRecord(Locale.Default.ToLanguageTag(), Encoding.UTF8.GetString(record.Payload));
break;
case NFCNdefTypeFormat.Mime:
ndefRecord = NdefRecord.CreateMime(record.MimeType, record.Payload);
break;
case NFCNdefTypeFormat.Uri:
ndefRecord = NdefRecord.CreateUri(Encoding.UTF8.GetString(record.Payload));
break;
case NFCNdefTypeFormat.External:
ndefRecord = NdefRecord.CreateExternal(record.ExternalDomain, record.ExternalType, record.Payload);
break;
case NFCNdefTypeFormat.Empty:
ndefRecord = GetEmptyNdefRecord();
break;
case NFCNdefTypeFormat.Unknown:
case NFCNdefTypeFormat.Unchanged:
case NFCNdefTypeFormat.Reserved:
default:
break;
}
return(ndefRecord);
}
/// <summary>
/// This method is called when an NFC tag is discovered by the application.
/// </summary>
/// <param name="intent"></param>
public void OnNewIntent(Intent intent)
{
if (_inReadMode)
{
_inReadMode = false;
var tag = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
var rawMsgs = intent.GetParcelableArrayExtra(NfcAdapter.ExtraNdefMessages);
if (tag == null)
{
return;
}
if (NfcAdapter.ExtraTag.Contains("nfc"))
{
HandleNFC(intent, true);
}
var tagId = tag.GetId();
_tagUid = ByteArrayToString(tagId);
Log.Info(this.GetType().ToString(), "Card UID is " + _tagUid);
}
else if (_inWriteMode)
{
_inWriteMode = false;
var obj = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
CultureInfo info = CultureInfo.CurrentCulture;
var payload = _writeTextView.Text;
var nfcRecord = NdefRecord.CreateTextRecord(info.TwoLetterISOLanguageName, payload);
var ndefMessage = new NdefMessage(new[] { nfcRecord });
if (!TryAndWriteToTag(obj, ndefMessage))
{
// Maybe the write couldn't happen because the tag wasn't formatted?
TryAndFormatTagWithMessage(obj, ndefMessage);
}
}
}
private NdefRecord GetAndroidNdefRecord(NfcNdefRecord record)
{
if (record == null)
{
return(null);
}
NdefRecord ndefRecord = null;
switch (record.TypeFormat)
{
case NfcNdefTypeFormat.WellKnown:
ndefRecord = NdefRecord.CreateTextRecord("en", Encoding.UTF8.GetString(record.Payload));
break;
case NfcNdefTypeFormat.Mime:
ndefRecord = NdefRecord.CreateMime(record.MimeType, record.Payload);
break;
case NfcNdefTypeFormat.Uri:
ndefRecord = NdefRecord.CreateUri(Encoding.UTF8.GetString(record.Payload));
break;
case NfcNdefTypeFormat.Empty:
byte[] empty = Array.Empty <byte>();
ndefRecord = new NdefRecord(NdefRecord.TnfEmpty, empty, empty, empty);
break;
case NfcNdefTypeFormat.External:
case NfcNdefTypeFormat.Unknown:
case NfcNdefTypeFormat.Unchanged:
case NfcNdefTypeFormat.Reserved:
default:
break;
}
return(ndefRecord);
}