Android -- 读取NFC卡号

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

<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>

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;
}

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);
}
}

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;
}