protected void UpdateDisplay(NdefLibrary.Ndef.NdefMessage messages)
{
Messages.Clear();
foreach (var message in messages)
{
Messages.Add(new MessageViewModel(message));
}
}
public MessageViewModel(NdefLibrary.Ndef.NdefRecord message)
{
Type type = message.CheckSpecializedType(true);
Type = type.Name;
Info = "Feel free to add this mapping to the message view model";
if (type == typeof (NdefLibrary.Ndef.NdefTextRecord))
{
var text = new NdefTextRecord(message);
Info = string.Format("The message on the tag is \"{0}\". The language is \"{1}\"", text.Text,
text.LanguageCode);
}
if (type == typeof(NdefLibrary.Ndef.NdefUriRecord))
{
var text = new NdefUriRecord(message);
Info = string.Format("The URI on the tag is \"{0}\"", text.Uri);
}
}
public void WriteTag(NdefLibrary.Ndef.NdefMessage message)
{
int messageSize = 0;
foreach (NdefRecord record in message)
{
messageSize += record.Payload.Length;
if (!record.CheckIfValid())
throw new Exception("A record on NDEFMessage is not valid");
}
if (!isTagPresent)
throw new Exception("No Tag present or Tag is incompatible ");
if (!nfcTag.IsWriteable)
throw new Exception("Tag is write locked ");
if (nfcTag.MaxSize < messageSize)
throw new Exception("Tag is too small for this message");
RaiseTagConnected(nfcTag);
nfcDevice.PublishBinaryMessage("NDEF:WriteTag", message.ToByteArray().AsBuffer(), writerHandler);
}
public Task<WriteResult> WriteTag(NdefLibrary.Ndef.NdefMessage message, System.Threading.CancellationToken cancellationToken, TimeSpan timeout)
{
throw new NotImplementedException();
}
public Task<WriteResult> WriteTag(NdefLibrary.Ndef.NdefMessage message, TimeSpan timeout)
{
throw new NotImplementedException();
}
public Task<WriteResult> WriteTag(NdefLibrary.Ndef.NdefMessage message, System.Threading.CancellationToken cancellationToken)
{
return WriteTag(message, cancellationToken, TimeSpan.FromTicks(0));
}
public Task<WriteResult> WriteTag(NdefLibrary.Ndef.NdefMessage message, TimeSpan timeout)
{
return WriteTag(message, CancellationToken.None, timeout);
}
protected override void NewMessage(string tagId,NdefLibrary.Ndef.NdefMessage message)
{
var nfcMessage = new MessageReceived(tagId, message, this);
_messenger.Publish(nfcMessage);
}
public void WriteTag (NdefLibrary.Ndef.NdefMessage message)
{
if (droidTag == null)
{
throw new Exception("Tag Error: No Tag to write, register to NewTag event before calling WriteTag()");
}
Ndef ndef = GetNdef (droidTag);
if (ndef == null)
{
throw new Exception("Tag Error: NDEF not supported");
}
try
{
ndef.Connect();
RaiseTagConnected (nfcTag);
}
catch
{
throw new Exception("Tag Error: No Tag nearby");
}
if(!ndef.IsWritable)
{
ndef.Close ();
throw new Exception("Tag Error: Tag is write locked");
}
int size = message.ToByteArray ().Length;
if(ndef.MaxSize < size)
{
ndef.Close ();
throw new Exception("Tag Error: Tag is too small");
}
try
{
List<Android.Nfc.NdefRecord> records = new List<Android.Nfc.NdefRecord>();
for(int i = 0; i< message.Count;i++)
{
if(message[i].CheckIfValid())
records.Add(new Android.Nfc.NdefRecord(Android.Nfc.NdefRecord.TnfWellKnown,message[i].Type,message[i].Id,message[i].Payload));
else
{
throw new Exception("NDEFRecord number " + i + "is not valid");
}
};
Android.Nfc.NdefMessage msg = new Android.Nfc.NdefMessage(records.ToArray());
ndef.WriteNdefMessage(msg);
}
catch (TagLostException tle)
{
throw new Exception("Tag Lost Error: " + tle.Message);
}
catch (IOException ioe)
{
throw new Exception("Tag IO Error: " + ioe.ToString());
}
catch (Android.Nfc.FormatException fe)
{
throw new Exception("Tag Format Error: " + fe.Message);
}
catch (Exception e)
{
throw new Exception("Tag Error: " + e.ToString());
}
finally
{
ndef.Close ();
RaiseTagTagDisconnected (nfcTag);
}
}
protected abstract void NewMessage(string tagID,NdefLibrary.Ndef.NdefMessage ndefMessage);
public MessageReceived(string tagId, NdefLibrary.Ndef.NdefMessage message, object sender)
: base(sender)
{
TagId = tagId;
Message = message;
}
