Android 通过NFC读取卡号

来喽来喽!昨晚下班前临时的任务用NFC读取IC卡的。原以为挺难。真正写了发现没几行代码!就先记录下来喽,下面是案例有需要的拿走!

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:

在这里插入图片描述

喜欢小编的进去看文章喽!!!!https://www.jianshu.com/u/e4f31a032e0e

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