private void Write(object sender, EventArgs e)
{
lock (this)
{
var label = FindViewById <TextView>(Resource.Id.DataLabel);
try
{
if (nfcTag == null)
{
label.Text = "nfc tag is null";
return;
}
var data = DateTime.Now.ToString();
/*
* var ndefRecord = new NdefRecord(NdefRecord.TnfMimeMedia,
* null,
* new byte[] { },
* Encoding.UTF8.GetBytes(data));
*/
var ndefRecord = NdefRecord.CreateExternal(
"Smartisan.Nfc.Smartisan.Nfc", // your domain name
"myapp", // your type name
Encoding.UTF8.GetBytes(data)); // payload
var ndef = Ndef.Get(nfcTag);
ndef.Connect();
ndef.WriteNdefMessage(new NdefMessage(ndefRecord));
ndef.Close();
label.Text = $"Data:{newLine}{data}";
}
catch (Exception ex)
{
label.Text += $"{newLine} Exception: {newLine} {ex.Message} {newLine} {ex.StackTrace}";
}
finally
{
if (nfcTag != null)
{
if (Ndef.Get(nfcTag).IsConnected)
{
Ndef.Get(nfcTag).Close();
}
}
}
}
}
/// <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);
}
public bool WriteExternalType(string domain, string type, string payload, object tag)
{
if (!(tag is Tag))
{
return(false);
}
if (string.IsNullOrEmpty(domain) || string.IsNullOrEmpty(type) || string.IsNullOrEmpty(payload))
{
return(false);
}
WriteResult writeResult = WriteResult.FAILED;
try
{
NdefRecord extRecord = NdefRecord.CreateExternal(domain, type, Encoding.UTF8.GetBytes(payload));
NdefMessage ndefMessage = new NdefMessage(new NdefRecord[] { extRecord });
writeResult = WriteTag(ndefMessage, (Tag)tag);
}
catch { }
return(writeResult == WriteResult.OK);
}