android实现通过NFC读取卡号
本文实例为大家分享了android通过NFC读取卡号的具体代码,供大家参考,具体内容如下
1.获取权限
<uses-permission android:name="android.permission.NFC" /> <uses-feature android:name="android.hardware.nfc" android:required="true" />
2.设置NFC活动页
<intent-filter> <action android:name="android.nfc.action.TAG_DISCOVERED" /> <data android:mimeType="text/plain" /> </intent-filter>
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:
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我们。
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