How to use

MifareUltralight

in

android.nfc.tech

  public String readTag(Tag tag) {
    MifareUltralight ultralight = MifareUltralight.get(tag);
    try {
      ultralight.connect();
      byte[] data = ultralight.readPages(4);
      return new String(data, Charset.forName("GB2312"));
    } catch (Exception e) {
    } finally {
      try {
        ultralight.close();
      } catch (Exception e) {
      }
    }
    return null;
  }
}

 Tag tag = intent.getParcelableExtra(NfcAdaptor.EXTRA_TAG);
MifareUltralight ul = MifareUltralight.get(tag);
if(ul == null)
 return; // not MIFARE Ultralight
byte[] authenticateCommand = { ... }; // data for authentication command
byte[] authenticateResponse = ul.transceive(authenticateCommand); // send it
... // etc.

  public void writeTag(Tag tag) {
    MifareUltralight ultralight = MifareUltralight.get(tag);
    try {
      ultralight.connect();
      //写入八个汉字，从第五页开始写，中文需要转换成GB2312格式
      ultralight.writePage(4, "北京".getBytes(Charset.forName("GB2312")));
      ultralight.writePage(5, "上海".getBytes(Charset.forName("GB2312")));
      ultralight.writePage(6, "广州".getBytes(Charset.forName("GB2312")));
      ultralight.writePage(7, "天津".getBytes(Charset.forName("GB2312")));
      Toast.makeText(this, "写入成功", Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
    } finally {
      try {
        ultralight.close();
      } catch (Exception e) {
      }
    }
  }
}

MifareUltralight mifareUltralight = MifareUltralight.get(tag);
if(mifareUltralight == null) {
  throw new IllegalArgumentException("No Mifare Ultralight");
int type = mifareUltralight.getType();

  tagTech = MifareUltralight.get(tag);
} else if (tech.equals(android.nfc.tech.NfcA.class.getName())) {
  tagTech = NfcA.get(tag);        

MifareUltralight mifareUltralight = MifareUltralight.get(tag);
if(mifareUltralight == null) {
  throw new IllegalArgumentException("No Mifare Ultralight");
mifareUltralight.connect();
int type = mifareUltralight.getType();
switch (type) {
  case MifareUltralight.TYPE_ULTRALIGHT: {
  bout.write(mifareUltralight.readPages(i));
mifareUltralight.close();