android通过NFC读取卡号

1.获取权限

2.设置NFC活动页

3.Activity代码

    //NFC对象    private NfcAdapter mNfcAdapter;    private PendingIntent pi;

1.主方法中：

//获取默认的NFC控制器        //初始化NfcAdapter        mNfcAdapter = NfcAdapter.getDefaultAdapter(this);        if (mNfcAdapter == null) {            Toast.makeText(AddPointActivity.this, "设备不支持NFC!", Toast.LENGTH_LONG).show();            finish();            return;        }        if (!mNfcAdapter.isEnabled()) {            Toast.makeText(AddPointActivity.this, "请在系统设置中先启用NFC功能!", Toast.LENGTH_LONG).show();            finish();            return;        }        //初始化PendingIntent        // 初始化PendingIntent，当有NFC设备连接上的时候，就交给当前Activity处理        pi = PendingIntent.getActivity(this, 0, new Intent(this, getClass())                .addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);

2.方法

//获取数据    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        // 当前app正在前端界面运行，这个时候有intent发送过来，那么系统就会调用onNewIntent回调方法，将intent传送过来        // 我们只需要在这里检验这个intent是否是NFC相关的intent，如果是，就调用处理方法        if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {            processIntent(intent);        }    }    //启动    @Override    protected void onResume() {        super.onResume();        mNfcAdapter.enableForegroundDispatch(this, pi, null, null);    }    //解析    private void processIntent(Intent intent) {        //取出封装在intent中的TAG        Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);        String CardId =ByteArrayToHexString(tagFromIntent.getId());        Toast.makeText(AddPointActivity.this, CardId, Toast.LENGTH_LONG).show();    }    //转为16进制字符串    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;    }

运行结果：

1.获取权限

2.设置NFC活动页

3.Activity代码

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