Code sample NFC in the development guide does not

Hello.

I just wrote a quick Hello world app for reading and writing NDEF records, based on the code provided in the development Guide.

I use the MiFare Ultralight tags. However, it does not work.

I could write NDEF only once during the tests, but after that I was unable to write the tags again or delete them using my application. However, the application of NFC demo included with the BB is able to write.

Thinking that the tag doesn't have enough space to store the nested NDEF message of the dev guide, I changed the code (reader and writer) use only a title and url records, without success.

I also tried to change the parameter listener of NDEFRecord.TNF_WELL_KNOW to NDEFRecord.TNF_ANY, so read the labels already written with the demo included in the BB application, but it has no effect. I have read that sporadically with the two types, but most of the time the BB does not detect everything just the tag.

Now, I know that:

  • The tag is readable and writable, because I read and written in the plain format ISO-14443-3 and the BB demo readings and Scripture in NDEF.
  • The tag is unlocked and able NDEF (inspected a target using DetectionListener object)
  • A few times I was able to write an NDEF tag, but then it is not readable by my application nor by BB demo group.
  • I have read several times, but most of the time it fails.
  • Tried to erase the label before writing, but does not work.

I use exactly the same code that appears in the development guide and a BB 9360.

Finally, I solved the problem. It turns out that my tags (Mifare Ultralight) have only 64 bytes of total storage, so the example NDEFMessage in the development Guide (root NDEF Sp record with two folders nested inside) is too big to be stored when the text exceeds a few words.

With regard to the NDEFTagConnection class, I found that the erase method throws exceptions, and that the append method is problematic. The only method that worked for me was the write method (who wrote the entire tag).

Tags: BlackBerry Developers

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