android NFC读卡demo 适用于M1,

public class NfcActivity extends BaseActivity {    public NfcAdapter mAdapter;    public PendingIntent mPendingIntent;    public IntentFilter[] mFilters;    public String[][] mTechLists;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        getWidthAndHeight();        mAdapter = NfcAdapter.getDefaultAdapter(this);        mPendingIntent = PendingIntent.getActivity(this, 0,                new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);        IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);        try {            ndef.addDataType("*/*");        } catch (IntentFilter.MalformedMimeTypeException e) {            throw new RuntimeException("fail", e);        }        mFilters = new IntentFilter[]{ndef,};        mTechLists = new String[][]{{IsoDep.class.getName()}, {NfcA.class.getName()},};        Log.d(" mTechLists", NfcF.class.getName() + mTechLists.length);        if (mAdapter == null) {            Toast.makeText(this, "设备不支持NFC！", Toast.LENGTH_LONG).show();            return;        }        if (!mAdapter.isEnabled()) {            Toast.makeText(this, "请在系统设置中先启用NFC功能！", Toast.LENGTH_LONG).show();            return;        }    }    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        //当该Activity接收到NFC标签时，运行该方法        //调用工具方法，读取NFC数据        Log.i("读到的值", resolveIntent(intent) + "");    }    // 读卡    String resolveIntent(Intent intent) {        String action = intent.getAction();        if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)) {            Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);            MifareClassic mfc = MifareClassic.get(tagFromIntent);            MifareClassCard mifareClassCard = null;            String authKey = "a2xQ61";//这是卡片的1扇区的密码（实际根据自己的卡片所设置的扇区和密码）            try {                mfc.connect();                boolean auth = false;                int secCount = mfc.getSectorCount();                mifareClassCard = new MifareClassCard(secCount);                int bCount = 0;                int bIndex = 0;                //连接NFC卡后到开始循环读取扇区                for (int j = 0; j < secCount; j++) {                    MifareSector mifareSector = new MifareSector();                    mifareSector.sectorIndex = j;                    if (j == 1 && !TextUtils.isEmpty(authKey)) {                        auth = mfc.authenticateSectorWithKeyA(j, hexStringToByte(str2HexStr(authKey)));//需用str2HexStr方法 将服务器传的卡密码string转16进制                    } else {                        auth = mfc.authenticateSectorWithKeyA(j, MifareClassic.KEY_DEFAULT);//默认密码                    }                    if (j >= 2) { //这里因为我只需要1扇区的，所以后面直接break了的遍历直接break了                        break;                    }                    mifareSector.authorized = auth;                    if (auth) {                        bCount = mfc.getBlockCountInSector(j);                        bCount = Math.min(bCount, MifareSector.BLOCKCOUNT);                        bIndex = mfc.sectorToBlock(j);                        for (int i = 0; i < bCount; i++) {                            byte[] data = mfc.readBlock(bIndex);                            MifareBlock mifareBlock = new MifareBlock(data);                            mifareBlock.blockIndex = bIndex;                            bIndex++;                            mifareSector.blocks[i] = mifareBlock;                        }                        mifareClassCard.setSector(mifareSector.sectorIndex, mifareSector);                    } else {                    }                }                ArrayList blockData = new ArrayList();                int blockIndex = 0;                //遍历每个扇区及对应的区块                for (int i = 0; i < secCount; i++) {                    MifareSector mifareSector = mifareClassCard.getSector(i);                    for (int j = 0; j < MifareSector.BLOCKCOUNT; j++) {                        MifareBlock mifareBlock = mifareSector.blocks[j];                        byte[] data = mifareBlock.getData();                        if (i == 1 && j == 0) {//我使用的卡内数据 写在1扇区 0块 ,拿到所需值返回即可//                            Log.e("扇区：" + blockIndex, "" + new String(data).trim());                            return new String(data).trim();                        }                        blockData.add("Block " + blockIndex++ + " : "                                + Converter.getHexString(data, data.length));                    }                }            } catch (IOException e) {                Log.e("IOException", e.toString());            } finally {                if (mifareClassCard != null) {                    mifareClassCard.debugPrint();                }            }        }// End of method        return "";    }    @Override    protected void onResume() {        super.onResume();        //开启前台调度系统        if (mAdapter != null) {            mAdapter.enableForegroundDispatch(this, mPendingIntent, null, null);        }    }    @Override    protected void onPause() {        super.onPause();        //关闭前台调度系统        mAdapter.disableForegroundDispatch(this);    }    public static byte[] hexStringToByte(String hex) {        int len = (hex.length() / 2);        byte[] result = new byte[len];        char[] achar = hex.toCharArray();        for (int i = 0; i < len; i++) {            int pos = i * 2;            result[i] = (byte) (toByte(achar[pos]) << 4 | toByte(achar[pos + 1]));        }        return result;    }    private static int toByte(char c) {        byte b = (byte) "0123456789ABCDEF".indexOf(c);        return b;    }    public static String str2HexStr(String str) {        char[] chars = "0123456789ABCDEF".toCharArray();        StringBuilder sb = new StringBuilder("");        byte[] bs = str.getBytes();        int bit;        for (int i = 0; i < bs.length; i++) {            bit = (bs[i] & 0x0f0) >> 4;            sb.append(chars[bit]);            bit = bs[i] & 0x0f;            sb.append(chars[bit]);        }        return sb.toString().trim();    }}

https://download.csdn.net/download/x976039745/10389314

实在不会弄怎么免费下载,最后1积分下载了。。。一些读NFC所需要的类,上面即为连接

（最后记得在manifests加上NFC权限！！！！！！！！！！！！）

android:name="android.permission.NFC" />

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