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<String> blockData = new ArrayList<String>();
                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！！！！！！！！！！！！）

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