Android实现读取NFC卡卡号示例

Android实现读取NFC卡卡号示例，具体如下：

1.权限

2.注册(静态)

3.Activity

初始化

    //初始化NfcAdapter
    mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
        // 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);

启动

  @Override
  protected void onResume() {
    super.onResume();
    mNfcAdapter.enableForegroundDispatch(this, pi, null, null); //启动
  }

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);
    }
  }

解析

  /**
   * Parses the NDEF Message from the intent and prints to the TextView
   */
  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());
  }
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;
  }

4.完整参考

package cn.com.jslh.zjcdprogrect.saoka;

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import cn.com.jslh.zjcdprogrect.R;

public class WorkActivity extends AppCompatActivity {

  private NfcAdapter mNfcAdapter;
  private PendingIntent pi;
  private IntentFilter tagDetected;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_work);

    //初始化NfcAdapter
    mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
    //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);
    // 新建IntentFilter，使用的是第二种的过滤机制
//    tagDetected = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
//    tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
  }

  @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);
    }
  }

  @Override
  protected void onResume() {
    super.onResume();
    mNfcAdapter.enableForegroundDispatch(this, pi, null, null);
  }

  /**
   * Parses the NDEF Message from the intent and prints to the TextView
   */
  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());
  }

  public static void startActivity(Context context){
    Intent intent = new Intent();
    intent.setClass(context,WorkActivity.class);
    context.startActivity(intent);
  }

  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;
  }
}

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脚本之家。