title: How to detect and write empty NFC tag?
body: <p>I have to write an android app, which reads and writes NFC tags (only plain texts). If the TAG is writeable, and I touch it to my tablet, I can detect it, and I can write or read it. But, if I touch a new, empty tag, an other app
  starts automatically. How can I prevent this, and write the empty tag?</p>