<uses-sdk android:minSdkVersion="14"/>
<uses-permission android:name="android.permission.NFC" />
<!-- 要求當(dāng)前設(shè)備必須要有NFC芯片 -->
<uses-feature android:name="android.hardware.nfc" android:required="true" />

<activity
  android:name=".TagTextActivity"
  android:launchMode="singleTop"/>

/**
 * 1.子類(lèi)需要在onCreate方法中做Activity初始化。
 * 2.子類(lèi)需要在onNewIntent方法中進(jìn)行NFC標(biāo)簽相關(guān)操作。
 *  當(dāng)launchMode設(shè)置為singleTop時(shí)，第一次運(yùn)行調(diào)用onCreate方法，
 *  第二次運(yùn)行將不會(huì)創(chuàng)建新的Activity實(shí)例，將調(diào)用onNewIntent方法
 *  所以我們獲取intent傳遞過(guò)來(lái)的Tag數(shù)據(jù)操作放在onNewIntent方法中執(zhí)行
 *  如果在棧中已經(jīng)有該Activity的實(shí)例，就重用該實(shí)例(會(huì)調(diào)用實(shí)例的onNewIntent())
 *  只要NFC標(biāo)簽靠近就執(zhí)行
 */
public class BaseNfcActivity extends AppCompatActivity {
  private NfcAdapter mNfcAdapter;
  private PendingIntent mPendingIntent;
  /**
   * 啟動(dòng)Activity，界面可見(jiàn)時(shí)
   */
  @Override
  protected void onStart() {
    super.onStart();
    mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
    //一旦截獲NFC消息，就會(huì)通過(guò)PendingIntent調(diào)用窗口
    mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()), 0);
  }
  /**
   * 獲得焦點(diǎn)，按鈕可以點(diǎn)擊
   */
  @Override
  public void onResume() {
    super.onResume();
    //設(shè)置處理優(yōu)于所有其他NFC的處理
    if (mNfcAdapter != null)
      mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);
  }
  /**
   * 暫停Activity，界面獲取焦點(diǎn)，按鈕可以點(diǎn)擊
   */
  @Override
  public void onPause() {
    super.onPause();
    //恢復(fù)默認(rèn)狀態(tài)
    if (mNfcAdapter != null)
      mNfcAdapter.disableForegroundDispatch(this);
  }
}

Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

Ndef ndef = Ndef.get(tag);

ndef.writeNdefMessage(ndefMessage);

public class RunAppActivity extends BaseNfcActivity{
  private String mPackageName = "com.android.mms";//短信
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  }
  @Override
  public void onNewIntent(Intent intent) {
    if (mPackageName == null)
      return;
    //1.獲取Tag對(duì)象
    Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    writeNFCTag(detectedTag);
  }
  /**
   * 往標(biāo)簽寫(xiě)數(shù)據(jù)的方法
   *
   * @param tag
   */
  public void writeNFCTag(Tag tag) {
    if (tag == null) {
      return;
    }
    NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{NdefRecord
        .createApplicationRecord(mPackageName)});
    //轉(zhuǎn)換成字節(jié)獲得大小
    int size = ndefMessage.toByteArray().length;
    try {
      //2.判斷NFC標(biāo)簽的數(shù)據(jù)類(lèi)型（通過(guò)Ndef.get方法）
      Ndef ndef = Ndef.get(tag);
      //判斷是否為NDEF標(biāo)簽
      if (ndef != null) {
        ndef.connect();
        //判斷是否支持可寫(xiě)
        if (!ndef.isWritable()) {
          return;
        }
        //判斷標(biāo)簽的容量是否夠用
        if (ndef.getMaxSize() < size) {
          return;
        }
        //3.寫(xiě)入數(shù)據(jù)
        ndef.writeNdefMessage(ndefMessage);
        Toast.makeText(this, "寫(xiě)入成功", Toast.LENGTH_SHORT).show();
      } else { //當(dāng)我們買(mǎi)回來(lái)的NFC標(biāo)簽是沒(méi)有格式化的，或者沒(méi)有分區(qū)的執(zhí)行此步
        //Ndef格式類(lèi)
        NdefFormatable format = NdefFormatable.get(tag);
        //判斷是否獲得了NdefFormatable對(duì)象，有一些標(biāo)簽是只讀的或者不允許格式化的
        if (format != null) {
          //連接
          format.connect();
          //格式化并將信息寫(xiě)入標(biāo)簽
          format.format(ndefMessage);
          Toast.makeText(this, "寫(xiě)入成功", Toast.LENGTH_SHORT).show();
        } else {
          Toast.makeText(this, "寫(xiě)入失敗", Toast.LENGTH_SHORT).show();
        }
      }
    } catch (Exception e) {
    }
  }
}

//直接接受一個(gè)Uri
public NdefRecord createUri(String uriString); 
//接受一個(gè)Uri的對(duì)象
public NdefRecord createUri(Uri uri); 

NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{NdefRecord
    .createApplicationRecord(mPackageName)});

NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{NdefRecord
    .createUri(Uri.parse(http://www.baidu.com))});

public class ReadTextActivity extends BaseNfcActivity {
  private TextView mNfcText;
  private String mTagText;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_read_text);
    mNfcText = (TextView) findViewById(R.id.tv_nfctext);
  }
  @Override
  public void onNewIntent(Intent intent) {
    //1.獲取Tag對(duì)象
    Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    //2.獲取Ndef的實(shí)例
    Ndef ndef = Ndef.get(detectedTag);
    mTagText = ndef.getType() + "\nmaxsize:" + ndef.getMaxSize() + "bytes\n\n";
    readNfcTag(intent);
    mNfcText.setText(mTagText);
  }
  /**
   * 讀取NFC標(biāo)簽文本數(shù)據(jù)
   */
  private void readNfcTag(Intent intent) {
    if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
      Parcelable[] rawMsgs = intent.getParcelableArrayExtra(
          NfcAdapter.EXTRA_NDEF_MESSAGES);
      NdefMessage msgs[] = null;
      int contentSize = 0;
      if (rawMsgs != null) {
        msgs = new NdefMessage[rawMsgs.length];
        for (int i = 0; i < rawMsgs.length; i++) {
          msgs[i] = (NdefMessage) rawMsgs[i];
          contentSize += msgs[i].toByteArray().length;
        }
      }
      try {
        if (msgs != null) {
          NdefRecord record = msgs[0].getRecords()[0];
          String textRecord = parseTextRecord(record);
          mTagText += textRecord + "\n\ntext\n" + contentSize + " bytes";
        }
      } catch (Exception e) {
      }
    }
  }
  /**
   * 解析NDEF文本數(shù)據(jù)，從第三個(gè)字節(jié)開(kāi)始，后面的文本數(shù)據(jù)
   * @param ndefRecord
   * @return
   */
  public static String parseTextRecord(NdefRecord ndefRecord) {
    /**
     * 判斷數(shù)據(jù)是否為NDEF格式
     */
    //判斷TNF
    if (ndefRecord.getTnf() != NdefRecord.TNF_WELL_KNOWN) {
      return null;
    }
    //判斷可變的長(zhǎng)度的類(lèi)型
    if (!Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_TEXT)) {
      return null;
    }
    try {
      //獲得字節(jié)數(shù)組，然后進(jìn)行分析
      byte[] payload = ndefRecord.getPayload();
      //下面開(kāi)始NDEF文本數(shù)據(jù)第一個(gè)字節(jié)，狀態(tài)字節(jié)
      //判斷文本是基于UTF-8還是UTF-16的，取第一個(gè)字節(jié)"位與"上16進(jìn)制的80，16進(jìn)制的80也就是最高位是1，
      //其他位都是0，所以進(jìn)行"位與"運(yùn)算后就會(huì)保留最高位
      String textEncoding = ((payload[0] & 0x80) == 0) ? "UTF-8" : "UTF-16";
      //3f最高兩位是0，第六位是1，所以進(jìn)行"位與"運(yùn)算后獲得第六位
      int languageCodeLength = payload[0] & 0x3f;
      //下面開(kāi)始NDEF文本數(shù)據(jù)第二個(gè)字節(jié)，語(yǔ)言編碼
      //獲得語(yǔ)言編碼
      String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
      //下面開(kāi)始NDEF文本數(shù)據(jù)后面的字節(jié)，解析出文本
      String textRecord = new String(payload, languageCodeLength + 1,
          payload.length - languageCodeLength - 1, textEncoding);
      return textRecord;
    } catch (Exception e) {
      throw new IllegalArgumentException();
    }
  }
}

<activity
  android:name=".ReadTextActivity"
  android:launchMode="singleTop"/>

public class WriteTextActivity extends BaseNfcActivity {
  private String mText = "NFC-NewText-123";
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_write_text);
  }
  @Override
  public void onNewIntent(Intent intent) {
    if (mText == null)
      return;
    //獲取Tag對(duì)象
    Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    NdefMessage ndefMessage = new NdefMessage(
        new NdefRecord[] { createTextRecord(mText) });
    boolean result = writeTag(ndefMessage, detectedTag);
    if (result){
      Toast.makeText(this, "寫(xiě)入成功", Toast.LENGTH_SHORT).show();
    } else {
      Toast.makeText(this, "寫(xiě)入失敗", Toast.LENGTH_SHORT).show();
    }
  }
  /**
   * 創(chuàng)建NDEF文本數(shù)據(jù)
   * @param text
   * @return
   */
  public static NdefRecord createTextRecord(String text) {
    byte[] langBytes = Locale.CHINA.getLanguage().getBytes(Charset.forName("US-ASCII"));
    Charset utfEncoding = Charset.forName("UTF-8");
    //將文本轉(zhuǎn)換為UTF-8格式
    byte[] textBytes = text.getBytes(utfEncoding);
    //設(shè)置狀態(tài)字節(jié)編碼最高位數(shù)為0
    int utfBit = 0;
    //定義狀態(tài)字節(jié)
    char status = (char) (utfBit + langBytes.length);
    byte[] data = new byte[1 + langBytes.length + textBytes.length];
    //設(shè)置第一個(gè)狀態(tài)字節(jié)，先將狀態(tài)碼轉(zhuǎn)換成字節(jié)
    data[0] = (byte) status;
    //設(shè)置語(yǔ)言編碼，使用數(shù)組拷貝方法，從0開(kāi)始拷貝到data中，拷貝到data的1到langBytes.length的位置
    System.arraycopy(langBytes, 0, data, 1, langBytes.length);
    //設(shè)置文本字節(jié)，使用數(shù)組拷貝方法，從0開(kāi)始拷貝到data中，拷貝到data的1 + langBytes.length
    //到textBytes.length的位置
    System.arraycopy(textBytes, 0, data, 1 + langBytes.length, textBytes.length);
    //通過(guò)字節(jié)傳入NdefRecord對(duì)象
    //NdefRecord.RTD_TEXT：傳入類(lèi)型 讀寫(xiě)
    NdefRecord ndefRecord = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,
        NdefRecord.RTD_TEXT, new byte[0], data);
    return ndefRecord;
  }
  /**
   * 寫(xiě)數(shù)據(jù)
   * @param ndefMessage 創(chuàng)建好的NDEF文本數(shù)據(jù)
   * @param tag 標(biāo)簽
   * @return
   */
  public static boolean writeTag(NdefMessage ndefMessage, Tag tag) {
    try {
      Ndef ndef = Ndef.get(tag);
      ndef.connect();
      ndef.writeNdefMessage(ndefMessage);
      return true;
    } catch (Exception e) {
    }
    return false;
  }
}

public class UriPrefix {
  public static final Map<Byte, String> URI_PREFIX_MAP = new HashMap<Byte, String>();
  // 預(yù)先定義已知Uri前綴
  static {
    URI_PREFIX_MAP.put((byte) 0x00, "");
    URI_PREFIX_MAP.put((byte) 0x01, "http://www.");
    URI_PREFIX_MAP.put((byte) 0x02, "https://www.");
    URI_PREFIX_MAP.put((byte) 0x03, "http://");
    URI_PREFIX_MAP.put((byte) 0x04, "https://");
    URI_PREFIX_MAP.put((byte) 0x05, "tel:");
    URI_PREFIX_MAP.put((byte) 0x06, "mailto:");
    URI_PREFIX_MAP.put((byte) 0x07, "ftp://anonymous:anonymous@");
    URI_PREFIX_MAP.put((byte) 0x08, "ftp://ftp.");
    URI_PREFIX_MAP.put((byte) 0x09, "ftps://");
    URI_PREFIX_MAP.put((byte) 0x0A, "sftp://");
    URI_PREFIX_MAP.put((byte) 0x0B, "smb://");
    URI_PREFIX_MAP.put((byte) 0x0C, "nfs://");
    URI_PREFIX_MAP.put((byte) 0x0D, "ftp://");
    URI_PREFIX_MAP.put((byte) 0x0E, "dav://");
    URI_PREFIX_MAP.put((byte) 0x0F, "news:");
    URI_PREFIX_MAP.put((byte) 0x10, "telnet://");
    URI_PREFIX_MAP.put((byte) 0x11, "imap:");
    URI_PREFIX_MAP.put((byte) 0x12, "rtsp://");
    URI_PREFIX_MAP.put((byte) 0x13, "urn:");
    URI_PREFIX_MAP.put((byte) 0x14, "pop:");
    URI_PREFIX_MAP.put((byte) 0x15, "sip:");
    URI_PREFIX_MAP.put((byte) 0x16, "sips:");
    URI_PREFIX_MAP.put((byte) 0x17, "tftp:");
    URI_PREFIX_MAP.put((byte) 0x18, "btspp://");
    URI_PREFIX_MAP.put((byte) 0x19, "btl2cap://");
    URI_PREFIX_MAP.put((byte) 0x1A, "btgoep://");
    URI_PREFIX_MAP.put((byte) 0x1B, "tcpobex://");
    URI_PREFIX_MAP.put((byte) 0x1C, "irdaobex://");
    URI_PREFIX_MAP.put((byte) 0x1D, "file://");
    URI_PREFIX_MAP.put((byte) 0x1E, "urn:epc:id:");
    URI_PREFIX_MAP.put((byte) 0x1F, "urn:epc:tag:");
    URI_PREFIX_MAP.put((byte) 0x20, "urn:epc:pat:");
    URI_PREFIX_MAP.put((byte) 0x21, "urn:epc:raw:");
    URI_PREFIX_MAP.put((byte) 0x22, "urn:epc:");
    URI_PREFIX_MAP.put((byte) 0x23, "urn:nfc:");
  }
}

<activity
  android:name=".ReadWriteUriActivity"
  android:label="讀寫(xiě)NFC標(biāo)簽的Uri"
  android:launchMode="singleTop" >
  <intent-filter>
    <action android:name="android.nfc.action.NDEF_DISCOVERED" />
    <category android:name="android.intent.category.DEFAULT" />
    <!-- 攔截NFC標(biāo)簽中存儲(chǔ)有以下Uri前綴的 -->
    <data android:scheme="http" />
    <data android:scheme="https" />
    <data android:scheme="ftp" />
  </intent-filter>
  <intent-filter>
    <action android:name="android.nfc.action.NDEF_DISCOVERED" />
    <category android:name="android.intent.category.DEFAULT" />
    <!-- 定義可以攔截文本 -->
    <data android:mimeType="text/plain" />
  </intent-filter>
</activity>

public class ReadUriActivity extends BaseNfcActivity {
  private TextView mNfcText;
  private String mTagText;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_read_uri);
    mNfcText = (TextView) findViewById(R.id.tv_nfctext);
  }
  @Override
  public void onNewIntent(Intent intent) {
    //獲取Tag對(duì)象
    Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    //獲取Ndef的實(shí)例
    Ndef ndef = Ndef.get(detectedTag);
    mTagText = ndef.getType() + "\n max size:" + ndef.getMaxSize() + " bytes\n\n";
    readNfcTag(intent);
    mNfcText.setText(mTagText);
  }
  /**
   * 讀取NFC標(biāo)簽Uri
   */
  private void readNfcTag(Intent intent) {
    if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
      Parcelable[] rawMsgs = intent.getParcelableArrayExtra(
          NfcAdapter.EXTRA_NDEF_MESSAGES);
      NdefMessage ndefMessage = null;
      int contentSize = 0;
      if (rawMsgs != null) {
        if (rawMsgs.length > 0) {
          ndefMessage = (NdefMessage) rawMsgs[0];
          contentSize = ndefMessage.toByteArray().length;
        } else {
          return;
        }
      }
      try {
        NdefRecord ndefRecord = ndefMessage.getRecords()[0];
        Log.i("JAVA",ndefRecord.toString());
        Uri uri = parse(ndefRecord);
        Log.i("JAVA","uri:"+uri.toString());
        mTagText += uri.toString() + "\n\nUri\n" + contentSize + " bytes";
      } catch (Exception e) {
      }
    }
  }
  /**
   * 解析NdefRecord中Uri數(shù)據(jù)
   * @param record
   * @return
   */
  public static Uri parse(NdefRecord record) {
    short tnf = record.getTnf();
    if (tnf == NdefRecord.TNF_WELL_KNOWN) {
      return parseWellKnown(record);
    } else if (tnf == NdefRecord.TNF_ABSOLUTE_URI) {
      return parseAbsolute(record);
    }
    throw new IllegalArgumentException("Unknown TNF " + tnf);
  }
  /**
   * 處理絕對(duì)的Uri
   * 沒(méi)有Uri識(shí)別碼，也就是沒(méi)有Uri前綴，存儲(chǔ)的全部是字符串
   * @param ndefRecord 描述NDEF信息的一個(gè)信息段，一個(gè)NdefMessage可能包含一個(gè)或者多個(gè)NdefRecord
   * @return
   */
  private static Uri parseAbsolute(NdefRecord ndefRecord) {
    //獲取所有的字節(jié)數(shù)據(jù)
    byte[] payload = ndefRecord.getPayload();
    Uri uri = Uri.parse(new String(payload, Charset.forName("UTF-8")));
    return uri;
  }
  /**
   * 處理已知類(lèi)型的Uri
   * @param ndefRecord
   * @return
   */
  private static Uri parseWellKnown(NdefRecord ndefRecord) {
    //判斷數(shù)據(jù)是否是Uri類(lèi)型的
    if (!Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_URI))
      return null;
    //獲取所有的字節(jié)數(shù)據(jù)
    byte[] payload = ndefRecord.getPayload();
    String prefix = UriPrefix.URI_PREFIX_MAP.get(payload[0]);
    byte[] prefixBytes = prefix.getBytes(Charset.forName("UTF-8"));
    byte[] fullUri = new byte[prefixBytes.length + payload.length - 1];
    System.arraycopy(prefixBytes, 0, fullUri, 0, prefixBytes.length);
    System.arraycopy(payload, 1, fullUri, prefixBytes.length, payload.length - 1);
    Uri uri = Uri.parse(new String(fullUri, Charset.forName("UTF-8")));
    return uri;
  }
}

public class WriteUriActivity extends BaseNfcActivity {
  private String mUri = "http://www.baidu.com";
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_write_uri);
  }
  public void onNewIntent(Intent intent) {
    Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{createUriRecord(mUri)});
    boolean result = writeTag(ndefMessage, detectedTag);
    if (result){
      Toast.makeText(this, "寫(xiě)入成功", Toast.LENGTH_SHORT).show();
    } else {
      Toast.makeText(this, "寫(xiě)入失敗", Toast.LENGTH_SHORT).show();
    }
  }
  /**
   * 將Uri轉(zhuǎn)成NdefRecord
   * @param uriStr
   * @return
   */
  public static NdefRecord createUriRecord(String uriStr) {
    byte prefix = 0;
    for (Byte b : UriPrefix.URI_PREFIX_MAP.keySet()) {
      String prefixStr = UriPrefix.URI_PREFIX_MAP.get(b).toLowerCase();
      if ("".equals(prefixStr))
        continue;
      if (uriStr.toLowerCase().startsWith(prefixStr)) {
        prefix = b;
        uriStr = uriStr.substring(prefixStr.length());
        break;
      }
    }
    byte[] data = new byte[1 + uriStr.length()];
    data[0] = prefix;
    System.arraycopy(uriStr.getBytes(), 0, data, 1, uriStr.length());
    NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_URI, new byte[0], data);
    return record;
  }
  /**
   * 寫(xiě)入標(biāo)簽
   * @param message
   * @param tag
   * @return
   */
  public static boolean writeTag(NdefMessage message, Tag tag) {
    int size = message.toByteArray().length;
    try {
      Ndef ndef = Ndef.get(tag);
      if (ndef != null) {
        ndef.connect();
        if (!ndef.isWritable()) {
          return false;
        }
        if (ndef.getMaxSize() < size) {
          return false;
        }
        ndef.writeNdefMessage(message);
        return true;
      }
    } catch (Exception e) {
    }
    return false;
  }
}

public class ReadMUActivity extends BaseNfcActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_read_mu);
  }
  @Override
  public void onNewIntent(Intent intent) {
    Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    String[] techList = tag.getTechList();
    boolean haveMifareUltralight = false;
    for (String tech : techList) {
      if (tech.indexOf("MifareUltralight") >= 0) {
        haveMifareUltralight = true;
        break;
      }
    }
    if (!haveMifareUltralight) {
      Toast.makeText(this, "不支持MifareUltralight數(shù)據(jù)格式", Toast.LENGTH_SHORT).show();
      return;
    }
    String data = readTag(tag);
    if (data != null)
      Toast.makeText(this, data, Toast.LENGTH_SHORT).show();
  }
  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;
  }
}

public class WriteMUActivity extends BaseNfcActivity {
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_write_mu);
  }
  @Override
  public void onNewIntent(Intent intent) {
    Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    String[] techList = tag.getTechList();
    boolean haveMifareUltralight = false;
    for (String tech : techList) {
      if (tech.indexOf("MifareUltralight") >= 0) {
        haveMifareUltralight = true;
        break;
      }
    }
    if (!haveMifareUltralight) {
      Toast.makeText(this, "不支持MifareUltralight數(shù)據(jù)格式", Toast.LENGTH_SHORT).show();
      return;
    }
    writeTag(tag);
  }
  public void writeTag(Tag tag) {
    MifareUltralight ultralight = MifareUltralight.get(tag);
    try {
      ultralight.connect();
      //寫(xiě)入八個(gè)漢字，從第五頁(yè)開(kāi)始寫(xiě)，中文需要轉(zhuǎn)換成GB2312格式
      ultralight.writePage(4, "北京".getBytes(Charset.forName("GB2312")));
      ultralight.writePage(5, "上海".getBytes(Charset.forName("GB2312")));
      ultralight.writePage(6, "廣州".getBytes(Charset.forName("GB2312")));
      ultralight.writePage(7, "天津".getBytes(Charset.forName("GB2312")));
      Toast.makeText(this, "寫(xiě)入成功", Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
    } finally {
      try {
        ultralight.close();
      } catch (Exception e) {
      }
    }
  }
}