public void setNdefPushMessage(NdefMessage message, Activity activity, Activity ... activities);

public void setNdefPushMessageCallback(CreateNdefMessageCallback callback, Activity activity, Activity ... activities);

public NdefMessage createNdefMessage(NfcEvent event)

 import java.nio.charset.Charset;

 import java.util.Locale;

 import android.app.Activity;

 import android.app.PendingIntent;

 import android.content.Intent;

 import android.nfc.NdefMessage;

 import android.nfc.NdefRecord;

 import android.nfc.NfcAdapter;

 import android.nfc.NfcAdapter.CreateNdefMessageCallback;

 import android.nfc.NfcAdapter.OnNdefPushCompleteCallback;

 import android.nfc.NfcEvent;

 import android.os.Bundle;

 import android.os.Parcelable;

 import android.util.Log;

 import android.widget.EditText;

 import android.widget.Toast;

 /*

  * 两个nfc设备通信示例

  * 本例中使用第2种方法传递数据,NfcAdapter.setNdefPushMessageCallback

  */

 public class AndroidBeamMainActivity extends Activity

         implements CreateNdefMessageCallback //传输数据的方法

         , OnNdefPushCompleteCallback {//OnNdefPushCompleteCallback是传输完毕的事件回调

     private EditText mBeamText;

     private NfcAdapter mNfcAdapter;

     private PendingIntent mPendingIntent;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_android_beam);

         mBeamText = (EditText) findViewById(R.id.edittext_beam_text);

         //设置当前aty为处理nfc的应用,注意aty为singleTop

         mNfcAdapter = mNfcAdapter.getDefaultAdapter(this);

         mPendingIntent = PendingIntent.getActivity(this, , new Intent(this,getClass()), );

         //数据传输函数回调

         mNfcAdapter.setNdefPushMessageCallback(this, this);

         //传输完毕回调

         mNfcAdapter.setOnNdefPushCompleteCallback(this, this);

     }

     /*

      * from OnNdefPushCompleteCallback

      * 数据传输完毕的回调.

      */

     @Override

     public void onNdefPushComplete(NfcEvent event) {

         Log.d("message", "complete");

     }

     /*

      * 这是CreateNdefMessageCallback的回调,

      * 创建一个NdefMessage.这里是把EditText中内容封装成NdefMessage

      * NdefMessage中record的类型可以自己随意,如text,uri,application

      *

      */

     @Override

     public NdefMessage createNdefMessage(NfcEvent event) {

         String text = mBeamText.getText().toString().trim();

         if ("".equals(text))

             text = "默认文本";

         /*

          * 创建一个ApplicationRecord类型的record

          * 启动计算器.

          */

         /*NdefMessage ndefMessage = new NdefMessage(

                 new NdefRecord[] { NdefRecord.createApplicationRecord("com.android.calculator2") });*/

         /*

          * 根据txt创建一个NdefRecord,并把它放入到NdefMessage中.

          */

         NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{createTextRecord(text)});

         return ndefMessage;

     }

     /*

      *注册当前aty为nfc处理功能

      */

     @Override

     public void onResume() {

         super.onResume();

         if (mNfcAdapter != null)

             mNfcAdapter.enableForegroundDispatch(this, mPendingIntent, null,

                     null);

     }

     /*

      *注销当前aty处理nfc的功能

      */

     @Override

     public void onPause() {

         super.onPause();

         if (mNfcAdapter != null)

             mNfcAdapter.disableForegroundDispatch(this);

     }

     @Override

     public void onNewIntent(Intent intent) {

         /*

          * 当本aty启动时,有另个nfc设备通过beam与本机配对并传来数据时,

          * 本函数接收数据,并用toast提示出来.

          * 如果要aty未启动,那么系统调用默认的处理程序.

          */

         processIntent(intent);

     }

     /*

      * 根据文本创建一个NdefRecord,

      * 注意ndef文本格式规范

      * 1,这些数据的第1个字节描述了数据的状态，

 　　  * 2,然后若干个字节描述文本的语言编码，

 　　  * 3,最后剩余字节表示文本数据。

      */

     public NdefRecord createTextRecord(String text) {

         //语言编码

         byte[] langBytes = Locale.CHINA.getLanguage().getBytes(Charset.forName("US-ASCII"));

         //设置text的字符编码为utf8

         Charset utfEncoding = Charset.forName("UTF-8");

         byte[] textBytes = text.getBytes(utfEncoding);

         int utfBit = ;

         char status = (char) (utfBit + langBytes.length);

         //申请空间

         byte[] data = new byte[ + langBytes.length + textBytes.length];

         //第1字节是状态码

         data[] = (byte) status;

         System.arraycopy(langBytes, , data, , langBytes.length);

         System.arraycopy(textBytes, , data,  + langBytes.length,textBytes.length);

         NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,NdefRecord.RTD_TEXT, new byte[], data);

         return record;

     }

     void processIntent(Intent intent) {

         Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);

         NdefMessage msg = (NdefMessage) rawMsgs[];

         String text = TextRecord.parse(msg.getRecords()[]).getText();

         Toast.makeText(this, text, Toast.LENGTH_LONG).show();

     }

 }

 import java.io.UnsupportedEncodingException;

 import java.util.Arrays;

 import android.nfc.NdefRecord;

 public class TextRecord {

     private final String mText;

     private TextRecord(String text) {

         mText = text;

     }

     public String getText() {

         return mText;

     }

     public static TextRecord parse(NdefRecord record) {

         if (record.getTnf() != NdefRecord.TNF_WELL_KNOWN)

             return null;

         if (!Arrays.equals(record.getType(), NdefRecord.RTD_TEXT))

             return null;

         try {

             byte[] payload = record.getPayload();

             /*

              * payload[0] contains the "Status Byte Encodings" field, per the

              * NFC Forum "Text Record Type Definition" section 3.2.1.

              *

              * bit7 is the Text Encoding Field.

              *

              * if (Bit_7 == 0): The text is encoded in UTF-8 if (Bit_7 == 1):

              * The text is encoded in UTF16

              *

              * Bit_6 is reserved for future use and must be set to zero.

              *

              * Bits 5 to 0 are the length of the IANA language code.

              */

             String textEncoding = ((payload[] & 0x80) == ) ? "UTF-8"

                     : "UTF-16";

             int languageCodeLength = payload[] & 0x3f;

             String languageCode = new String(payload, , languageCodeLength,"US-ASCII");

             String text = new String(payload, languageCodeLength + ,

                     payload.length - languageCodeLength - , textEncoding);

             return new TextRecord(text);

         } catch (UnsupportedEncodingException e) {

             // should never happen unless we get a malformed tag.

             throw new IllegalArgumentException(e);

         }

     }

 }