package com.softsea.cs_park;

 import android.app.Activity;

 import android.content.Intent;

 import android.nfc.NfcAdapter;

 import android.nfc.Tag;

 import android.nfc.tech.MifareClassic;

 import android.os.Bundle;

 import android.widget.TextView;

 public class activity extends Activity {

     NfcAdapter nfcAdapter;

     TextView promt;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         promt = (TextView) findViewById(R.id.promt);

         // 获取默认的NFC控制器

         nfcAdapter = NfcAdapter.getDefaultAdapter(this);

         if (nfcAdapter == null) {

             promt.setText("设备不支持NFC！");

             finish();

             return;

         }

         if (!nfcAdapter.isEnabled()) {

             promt.setText("请在系统设置中先启用NFC功能！");

             finish();

             return;

         }

     }

     @Override

     protected void onResume() {

         super.onResume();

         //得到是否检测到ACTION_TECH_DISCOVERED触发

         if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {

             //处理该intent

             processIntent(getIntent());

         }

     }

     //字符序列转换为16进制字符串

     private String bytesToHexString(byte[] src) {

         StringBuilder stringBuilder = new StringBuilder("0x");

         if (src == null || src.length <= 0) {

             return null;

         }

         char[] buffer = new char[2];

         for (int i = 0; i < src.length; i++) {

             buffer[0] = Character.forDigit((src[i] >>> 4) & 0x0F, 16);

             buffer[1] = Character.forDigit(src[i] & 0x0F, 16);

             System.out.println(buffer);

             stringBuilder.append(buffer);

         }

         return stringBuilder.toString();

     }

     /**

      * 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);

         for (String tech : tagFromIntent.getTechList()) {

             System.out.println(tech);

         }

         boolean auth = false;

         //读取TAG

         MifareClassic mfc = MifareClassic.get(tagFromIntent);

         try {

             String metaInfo = "";

             //Enable I/O operations to the tag from this TagTechnology object.

             mfc.connect();

             int type = mfc.getType();//获取TAG的类型

             int sectorCount = mfc.getSectorCount();//获取TAG中包含的扇区数

             String typeS = "";

             switch (type) {

             case MifareClassic.TYPE_CLASSIC:

                 typeS = "TYPE_CLASSIC";

                 break;

             case MifareClassic.TYPE_PLUS:

                 typeS = "TYPE_PLUS";

                 break;

             case MifareClassic.TYPE_PRO:

                 typeS = "TYPE_PRO";

                 break;

             case MifareClassic.TYPE_UNKNOWN:

                 typeS = "TYPE_UNKNOWN";

                 break;

             }

             metaInfo += "卡片类型：" + typeS + "\n共" + sectorCount + "个扇区\n共"

                     + mfc.getBlockCount() + "个块\n存储空间: " + mfc.getSize() + "B\n";

             for (int j = 0; j < sectorCount; j++) {

                 //Authenticate a sector with key A.

                 auth = mfc.authenticateSectorWithKeyA(j,

                         MifareClassic.KEY_DEFAULT);

                 int bCount;

                 int bIndex;

                 if (auth) {

                     metaInfo += "Sector " + j + ":验证成功\n";

                     // 读取扇区中的块

                     bCount = mfc.getBlockCountInSector(j);

                     bIndex = mfc.sectorToBlock(j);

                     for (int i = 0; i < bCount; i++) {

                         byte[] data = mfc.readBlock(bIndex);

                         metaInfo += "Block " + bIndex + " : "

                                 + bytesToHexString(data) + "\n";

                         bIndex++;

                     }

                 } else {

                     metaInfo += "Sector " + j + ":验证失败\n";

                 }

             }

             promt.setText(metaInfo);

         } catch (Exception e) {

             e.printStackTrace();

         }

     }

 }