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   源码介绍

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package com.simcom.readnfclist.activity;

import android.app.PendingIntent;
import android.content.Intent;
import android.nfc.NdefMessage;
import android.nfc.NdefRecord;
import android.nfc.NfcAdapter;
import android.nfc.Tag;
import android.nfc.tech.IsoDep;
import android.nfc.tech.MifareClassic;
import android.nfc.tech.MifareUltralight;
import android.nfc.tech.Ndef;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcelable;
import android.support.annotation.RequiresApi;
import android.widget.TextView;
import android.widget.Toast;

import com.simcom.readnfclist.R;
import com.simcom.readnfclist.base.BaseNfcActivity;
import com.simcom.readnfclist.tools.utils;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
import com.simcom.readnfclist.been.NfsreadAID;
import com.simcom.readnfclist.db.AccountStorage;
/**
 * Author:Created by Ricky on 2017/8/25.
 * Email:584182977@qq.com
 * Description:
 */
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public class ReadTextActivity extends BaseNfcActivity  implements NfcAdapter.ReaderCallback  {
    private TextView mNfcText;
    private String mTagText;

    // self-defined APDU
    public static final String STATUS_SUCCESS = "9000";
    public static final String STATUS_FAILED = "6F00";
    public static final String CLA_NOT_SUPPORTED = "6E00";
    public static final String INS_NOT_SUPPORTED = "6D00";
    public static final String AID = "A0000002471001";
    public static final String LC = "07";
    public static final String SELECT_INS = "A4";
    public static final String DEFAULT_CLA = "00";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_read_text);
        mNfcText = (TextView) findViewById(R.id.tv_nfctext);
    }

    @Override
    public void onNewIntent(Intent intent) {
     /*   //1.获取Tag对象
        Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
        //2.获取Ndef的实例
        Ndef ndef = Ndef.get(detectedTag);

        mTagText = ndef.getType()   "\nmaxsize:"   ndef.getMaxSize()   "bytes\n\n";
        readNfcTag(intent);
        mNfcText.setText(mTagText);*/
        if (intent != null) {
            processIntent(intent);
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
    }

    @Override
    public void onResume() {
        // TODO Auto-generated method stub
        super.onResume();

      /*  if (NfcAdapter.EXTRA_AID != null)
            NfcAdapter.enableForegroundDispatch(this, pendingIntent, FILTERS, TECHLISTS);
        NfcAdapter.enableReaderMode(this, this,
                NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK,
                null);*/
    }

    /**
     * 读取NFC标签文本数据
     */
    private void readNfcTag(Intent intent) {
        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
            Parcelable[] rawMsgs = intent.getParcelableArrayExtra(
                    NfcAdapter.EXTRA_NDEF_MESSAGES);
            NdefMessage msgs[] = null;
            int contentSize = 0;
            if (rawMsgs != null) {
                msgs = new NdefMessage[rawMsgs.length];
                for (int i = 0; i < rawMsgs.length; i  ) {
                    msgs[i] = (NdefMessage) rawMsgs[i];
                    contentSize  = msgs[i].toByteArray().length;
                }
            }
            try {
                if (msgs != null) {
                    NdefRecord record = msgs[0].getRecords()[0];
                    String textRecord = parseTextRecord(record);
                    mTagText  = textRecord   "\n\ntext\n"   contentSize   " bytes";
                }
            } catch (Exception e) {
            }
        }
    }

    /**
     * 解析NDEF文本数据，从第三个字节开始，后面的文本数据
     *
     * @param ndefRecord
     * @return
     */
    public static String parseTextRecord(NdefRecord ndefRecord) {
        /**
         * 判断数据是否为NDEF格式
         */
        //判断TNF
        if (ndefRecord.getTnf() != NdefRecord.TNF_WELL_KNOWN) {
            return null;
        }
        //判断可变的长度的类型
        if (!Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_TEXT)) {
            return null;
        }
        try {
            //获得字节数组，然后进行分析
            byte[] payload = ndefRecord.getPayload();
            //下面开始NDEF文本数据第一个字节，状态字节
            //判断文本是基于UTF-8还是UTF-16的，取第一个字节"位与"上16进制的80，16进制的80也就是最高位是1，
            //其他位都是0，所以进行"位与"运算后就会保留最高位
            String textEncoding = ((payload[0] & 0x80) == 0) ? "UTF-8" : "UTF-16";
            //3f最高两位是0，第六位是1，所以进行"位与"运算后获得第六位
            int languageCodeLength = payload[0] & 0x3f;
            //下面开始NDEF文本数据第二个字节，语言编码
            //获得语言编码
            String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
            //下面开始NDEF文本数据后面的字节，解析出文本
            String textRecord = new String(payload, languageCodeLength   1,
                    payload.length - languageCodeLength - 1, textEncoding);
            return textRecord;
        } catch (Exception e) {
            throw new IllegalArgumentException();
        }
    }

    @Override
    public void onTagDiscovered(Tag tag) {
        System.out.println("onTagDiscovered");
        // Card response for IsoDep
        final StringBuilder cardResp = new StringBuilder("Card response: \n");

        // read card data of CardEmulator
        IsoDep isoDep = IsoDep.get(tag);
        try {
            isoDep.connect();
            byte [] resp = isoDep.transceive(utils.hexStringToByteArray(DEFAULT_CLA   SELECT_INS   "0400"   LC   AID));
            String respStatus = utils.encodeHexString(resp, true);

            if (respStatus.equals(STATUS_SUCCESS)) {
                cardResp.append("Success response");
            } else {
                cardResp.append("Failed response, code:").append(respStatus);
            }
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                     /*   if (getIntent() != null) {
                            processIntent(getIntent());
                        }else*/
                    {
                       mNfcText.setText(cardResp.toString());
                    }
                }
            });
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    private void processIntent(Intent intent) {

        if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
            Toast.makeText(this, "ACTION_TECH_DISCOVERED", Toast.LENGTH_LONG).show();
        } else if (Intent.ACTION_MAIN.equals(intent.getAction())) {
            return;
        } /*else {
            Toast.makeText(this, "Invalid action - "   intent.getAction(), Toast.LENGTH_LONG).show();
            return;
        }*/

        StringBuilder nfcInfo = new StringBuilder();
        byte[] extraId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);

        // Id
        if (extraId != null) {
            ///NfsreadAID aid =new NfsreadAID();
            //aid.setResdAID(utils.encodeHexString(extraId, false));
            AccountStorage.SetAccount(this ,utils.encodeHexString(extraId, false));
            nfcInfo.append("ID (hex): ").append(utils.encodeHexString(extraId, false)).append("\n");
        }

        // Tag info
        Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

        // Technologies
        StringBuilder technologiesAvailable = new StringBuilder("Technologies Available: \n");

        // Card type.
        StringBuilder cardType = new StringBuilder("Card Type: \n");

        // Sector and block.
        StringBuilder sectorAndBlock = new StringBuilder("Storage: \n");

        // Sector check
        StringBuilder sectorCheck = new StringBuilder("Sector check: \n");

        int idx = 0;
        for (String tech : tag.getTechList()) {
            if (tech.equals(MifareClassic.class.getName())) {
                // Mifare Classic
                MifareClassic mfc = MifareClassic.get(tag);
                switch (mfc.getType()) {
                    case MifareClassic.TYPE_CLASSIC:
                        cardType.append("Classic");
                        break;

                    case MifareClassic.TYPE_PLUS:
                        cardType.append("Plus");
                        break;

                    case MifareClassic.TYPE_PRO:
                        cardType.append("Pro");
                        break;

                    case MifareClassic.TYPE_UNKNOWN:
                        cardType.append("Unknown");
                        break;
                }

                sectorAndBlock.append("Sectors: ").append(mfc.getSectorCount()).append("\n")
                        .append("Blocks: ").append(mfc.getBlockCount()).append("\n")
                        .append("Size: ").append(mfc.getSize()).append(" Bytes");

                try {
                    // Enable I/O to the tag
                    mfc.connect();

                    for (int i = 0; i < mfc.getSectorCount();   i) {
                        if (mfc.authenticateSectorWithKeyA(i, MifareClassic.KEY_DEFAULT)) {
                            sectorCheck.append("Sector <").append(i).append("> with KeyA auth succ\n");

                            // Read block of sector
                            final int blockIndex = mfc.sectorToBlock(i);
                            for (int j = 0; j < mfc.getBlockCountInSector(i);   j) {
                                byte[] blockData = mfc.readBlock(blockIndex j);
                                sectorCheck.append("  Block <").append(blockIndex j).append("> ")
                                        .append(utils.encodeHexString(blockData, false)).append("\n");
                            }

                        } else if (mfc.authenticateSectorWithKeyB(i, MifareClassic.KEY_DEFAULT)) {
                            sectorCheck.append("Sector <").append(i).append("> with KeyB auth succ\n");

                            // Read block of sector
                            final int blockIndex = mfc.sectorToBlock(i);
                            for (int j = 0; j < mfc.getBlockCountInSector(i);   j) {
                                byte[] blockData = mfc.readBlock(blockIndex j);
                                sectorCheck.append("  Block <").append(blockIndex j).append("> ")
                                        .append(utils.encodeHexString(blockData, false)).append("\n");
                            }
                        } else {
                            sectorCheck.append("Sector <").append(i).append("> auth failed\n");
                        }
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                    Toast.makeText(this, "Try again and keep NFC tag below device", Toast.LENGTH_LONG).show();
                }
            } else if (tech.equals(MifareUltralight.class.getName())) {
                // Mifare Ultralight
                MifareUltralight mful = MifareUltralight.get(tag);
                switch (mful.getType()) {
                    case MifareUltralight.TYPE_ULTRALIGHT:
                        cardType.append("Ultralight");
                        break;

                    case MifareUltralight.TYPE_ULTRALIGHT_C:
                        cardType.append("Ultralight C");
                        break;

                    case MifareUltralight.TYPE_UNKNOWN:
                        cardType.append("Unknown");
                        break;
                }
            }

            String [] techPkgFields = tech.split("\\.");
            if (techPkgFields.length > 0) {
                final String techName = techPkgFields[techPkgFields.length-1];
                if (0 == idx  ) {
                    technologiesAvailable.append(techName);
                } else {
                    technologiesAvailable.append(", ").append(techName);
                }
            }
        }

        nfcInfo.append("\n").append(technologiesAvailable).append("\n")
                .append("\n").append(cardType).append("\n");

        // NDEF Messages
        StringBuilder sbNdefMessages = new StringBuilder("NDEF Messages: \n");
        Parcelable[] rawMessages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
        if (rawMessages != null) {
            NdefMessage[] messages = new NdefMessage[rawMessages.length];
            for (int i = 0; i < rawMessages.length;   i) {
                messages[i] = (NdefMessage) rawMessages[i];
            }

            for (NdefMessage message : messages) {
                for (NdefRecord record : message.getRecords()) {
                    if (record.getTnf() == NdefRecord.TNF_WELL_KNOWN) {
                        if (Arrays.equals(record.getType(), NdefRecord.RTD_TEXT)) {
                            try {
                                // NFC Forum "Text Record Type Definition" section 3.2.1.
                                byte[] payload = record.getPayload();
                                String textEncoding = ((payload[0] & 0200) == 0) ? "UTF-8" : "UTF-16";
                                int languageCodeLength = payload[0] & 0077;
                                String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
                                String text = new String(payload, languageCodeLength   1,
                                        payload.length - languageCodeLength - 1, textEncoding);
                                sbNdefMessages.append(" - ").append(languageCode).append(", ")
                                        .append(textEncoding).append(", ").append(text).append("\n");
                            } catch (UnsupportedEncodingException e) {
                                // should never happen unless we get a malformed tag.
                                throw new IllegalArgumentException(e);
                            }
                        }
                    }
                }
            }
        }
        nfcInfo.append("\n").append(sbNdefMessages).append("\n")
                .append("\n").append(sectorAndBlock).append("\n")
                .append("\n").append(sectorCheck).append("\n");

        mNfcText.setText(nfcInfo.toString());
    }


}