public async Task WriteNdefAsync(NdefMessage ndefMessage)
{
Android.Nfc.Tech.Ndef ndef = null;
try
{
await _lockSemaphore.WaitAsync();
if (!_isNfcEnabled)
{
throw new Exception("NFC is not enabled");
}
ndef = Android.Nfc.Tech.Ndef.Get(_tag);
ndef.Connect();
await ndef.WriteNdefMessageAsync(new Android.Nfc.NdefMessage(ndefMessage.ToByteArray()));
ndef.Close();
}
catch (Exception ex)
{
if (ndef.IsConnected)
{
ndef.Close();
}
throw ex;
}
finally
{
_lockSemaphore.Release();
}
}
public async Task <NdefMessage> ReadNdefAsync()
{
Android.Nfc.Tech.Ndef ndef = null;
try
{
await _lockSemaphore.WaitAsync();
if (!_isNfcEnabled)
{
throw new Exception("NFC is not enabled");
}
ndef = Android.Nfc.Tech.Ndef.Get(_tag);
ndef.Connect();
var ndefMessage = NdefMessage.FromByteArray(ndef.NdefMessage.ToByteArray());
ndef.Close();
return(ndefMessage);
}
catch (Exception ex)
{
if (ndef.IsConnected)
{
ndef.Close();
}
throw ex;
}
finally
{
_lockSemaphore.Release();
}
}