1. menifest文件中需要添加：

android:name="android.hardware.nfc"

android:required="true" />

在activity中添加：

2. 初始化时代码：

Intent nfcIntent = new Intent(this, getClass());

nfcIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);

mPendingIntent =

PendingIntent.getActivity(this, 0,nfcIntent , 0);

mAdapter = NfcAdapter.getDefaultAdapter(this);

if (mAdapter == null) {

Toast.makeText(getApplicationContext(), "NFC feature is supported on this device.", Toast.LENGTH_SHORT).show();

return;

}

需要Override的函数：

private NfcAdapter mAdapter;

private PendingIntent mPendingIntent;

@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)

protected void onResume() {

super.onResume();

mAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);

}

@Override

protected void onNewIntent(Intent intent){

getTagInfo(intent);

}

@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)

private void getTagInfo(Intent intent) {

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

byte[] tagId = tag.getId();

String str = ByteArrayToHexString(tagId);

str = flipHexStr(str);

Long cardNo = Long.parseLong(str, 16);

String ignoreOperationId = m_operationid;

if(m_isOnline){

// if select all , pass in the operation id encoded in ticket

// there should NOT be many operations, take the only one

new CardValidationAsyncTask().execute(cardNo.toString());

}

}

@TargetApi(Build.VERSION_CODES.GINGERBREAD_MR1)

@Override

protected void onPause() {

super.onPause();

if (mAdapter != null) {

mAdapter.disableForegroundDispatch(this);

}

}

以下为helper函数：

private String flipHexStr(String s){

StringBuilder result = new StringBuilder();

for (int i = 0; i <=s.length()-2; i=i+2) {

result.append(new StringBuilder(s.substring(i,i+2)).reverse());

}

return result.reverse().toString();

}

private String ByteArrayToHexString(byte[] inarray) {

int i, j, in;

String[] hex = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A",

"B", "C", "D", "E", "F" };

String out = "";

for (j = 0; j < inarray.length; ++j) {

in = (int) inarray[j] & 0xff;

i = (in >> 4) & 0x0f;

out += hex[i];

i = in & 0x0f;

out += hex[i];

}

return out;

}