<uses-permission android:name="android.permission.NFC" /> 

<uses-sdk android:minSdkVersion="14" android:targetSdkVersion="14" /> 

<uses-feature android:name="android.hardware.nfc" android:required="true" /> 

<intent-filter> 
  <action android:name="android.nfc.action.NDEF_DISCOVERED" ></action> 
  <category android:name="android.intent.category.DEFAULT" ></category> 
  <data android:mimeType="text/plain" ></data> 
</intent-filter>  

@Override 
protected void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.activity_write); 
  nfcTView=(TextView)findViewById(R.id.info_tv); 
  nfcAdapter = NfcAdapter.getDefaultAdapter(this); 
  if (nfcAdapter == null) { 
    nfcTView.setText("设备不支持NFC！"); 
    finish(); 
    return; 
  } 
  if (nfcAdapter!=null&&!nfcAdapter.isEnabled()) { 
    nfcTView.setText("请在系统设置中先启用NFC功能！"); 
    finish(); 
    return; 
  } 
} 
@Override 
protected void onResume() { 
  super.onResume(); 
  if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) { 
    readFromTag(getIntent()); 
  } 
} 

private boolean readFromTag(Intent intent){ 
  Parcelable[] rawArray = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES); 
  NdefMessage mNdefMsg = (NdefMessage)rawArray[0]; 
  NdefRecord mNdefRecord = mNdefMsg.getRecords()[0]; 
  try { 
    if(mNdefRecord != null){ 
      readResult = new String(mNdefRecord.getPayload(),"UTF-8"); 
      return true; 
     } 
  } 
  catch (UnsupportedEncodingException e) { 
     e.printStackTrace(); 
  }; 
  return false; 
 } 

@Override 
protected void onResume() { 
  super.onResume(); 
  if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) { 
    Tag tag=getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG); 
    Ndef ndef=Ndef.get(tag); 
    try { 
      ndef.connect(); 
      NdefRecord ndefRecord=createTextRecord(data,Locale.US,true); 
      NdefRecord[] records={ndefRecord}; 
      NdefMessage ndefMessage=new NdefMessage(records); 
      ndef.writeNdefMessage(ndefMessage); 
    } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
    } catch (FormatException e) { 
      <span style="white-space:pre">   </span>// TODO Auto-generated catch block 
      <span style="white-space:pre">   </span>e.printStackTrace(); 
    } 
}