Java NdefRecord類代碼示例

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * 讀取NFC標簽文本數據
 */
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) {
        }
    }
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * 創建NDEF文本數據
 *
 * @param text
 * @return
 */
public static NdefRecord createTextRecord(String text) {
    byte[] langBytes = Locale.CHINA.getLanguage().getBytes(Charset.forName("US-ASCII"));
    Charset utfEncoding = Charset.forName("UTF-8");
    //將文本轉換為UTF-8格式
    byte[] textBytes = text.getBytes(utfEncoding);
    //設置狀態字節編碼最高位數為0
    int utfBit = 0;
    //定義狀態字節
    char status = (char) (utfBit + langBytes.length);
    byte[] data = new byte[1 + langBytes.length + textBytes.length];
    //設置第一個狀態字節，先將狀態碼轉換成字節
    data[0] = (byte) status;
    //設置語言編碼，使用數組拷貝方法，從0開始拷貝到data中，拷貝到data的1到langBytes.length的位置
    System.arraycopy(langBytes, 0, data, 1, langBytes.length);
    //設置文本字節，使用數組拷貝方法，從0開始拷貝到data中，拷貝到data的1 + langBytes.length
    //到textBytes.length的位置
    System.arraycopy(textBytes, 0, data, 1 + langBytes.length, textBytes.length);
    //通過字節傳入NdefRecord對象
    //NdefRecord.RTD_TEXT：傳入類型 讀寫
    NdefRecord ndefRecord = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,
            NdefRecord.RTD_TEXT, new byte[0], data);
    return ndefRecord;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * Checks to see if the activity's intent ({@link android.app.Activity#getIntent()}) is
 * an NFC intent that the app recognizes. If it is, then parse the NFC message and set the
 * activity's intent (using {@link Activity#setIntent(android.content.Intent)}) to something
 * the app can recognize (i.e. a normal {@link Intent#ACTION_VIEW} intent).
 */
public static void tryUpdateIntentFromBeam(Activity activity) {
    Intent originalIntent = activity.getIntent();
    if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(originalIntent.getAction())) {
        Parcelable[] rawMsgs = originalIntent.getParcelableArrayExtra(
                NfcAdapter.EXTRA_NDEF_MESSAGES);
        NdefMessage msg = (NdefMessage) rawMsgs[0];
        // Record 0 contains the MIME type, record 1 is the AAR, if present.
        // In iosched, AARs are not present.
        NdefRecord mimeRecord = msg.getRecords()[0];
        if (ScheduleContract.makeContentItemType(
                ScheduleContract.Sessions.CONTENT_TYPE_ID).equals(
                new String(mimeRecord.getType()))) {
            // Re-set the activity's intent to one that represents session details.
            Intent sessionDetailIntent = new Intent(Intent.ACTION_VIEW,
                    Uri.parse(new String(mimeRecord.getPayload())));
            activity.setIntent(sessionDetailIntent);
        }
    }
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
private String getTextFromNdefRecord(NdefRecord ndefRecord)
{
    String content = null;

    try
    {
        byte[] payload = ndefRecord.getPayload();
        String encoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTf-8";

        int languageSize = payload[0] & 0063;

        content = new String(payload, languageSize+1, payload.length - languageSize - 1, encoding);
    }
    catch (UnsupportedEncodingException e)
    {
        Log.e("createTextRecord", e.getMessage());
    }

    return content;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
private NdefRecord createTextRecord (String message)
{
    try
    {
        byte[] language;
        language = Locale.getDefault().getLanguage().getBytes("UTF-8");

        final byte[] text = message.getBytes("UTF-8");
        final int languageSize = language.length;
        final int textLength = text.length;

        final ByteArrayOutputStream payload = new ByteArrayOutputStream(1 + languageSize + textLength);

        payload.write((byte) (languageSize & 0x1F));
        payload.write(language, 0, languageSize);
        payload.write(text, 0, textLength);

        return new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, new byte[0], payload.toByteArray());
    }
    catch (UnsupportedEncodingException e)
    {
        Log.e("createTextRecord", e.getMessage());
    }
    return null;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
public void onNewIntent(Intent intent) {
    Tag detectedTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    NdefMessage ndefMessage = new NdefMessage(new NdefRecord[]{createUriRecord(mUri)});
    boolean result = writeTag(ndefMessage, detectedTag);
    if (result) {
        Toast.makeText(this, "寫入成功", Toast.LENGTH_SHORT).show();
    } else {
        Toast.makeText(this, "寫入失敗", Toast.LENGTH_SHORT).show();
    }
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * 將Uri轉成NdefRecord
 *
 * @param uriStr
 * @return
 */
public static NdefRecord createUriRecord(String uriStr) {
    byte prefix = 0;
    for (Byte b : UriPrefix.URI_PREFIX_MAP.keySet()) {
        String prefixStr = UriPrefix.URI_PREFIX_MAP.get(b).toLowerCase();
        if ("".equals(prefixStr))
            continue;
        if (uriStr.toLowerCase().startsWith(prefixStr)) {
            prefix = b;
            uriStr = uriStr.substring(prefixStr.length());
            break;
        }
    }
    byte[] data = new byte[1 + uriStr.length()];
    data[0] = prefix;
    System.arraycopy(uriStr.getBytes(), 0, data, 1, uriStr.length());
    NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_URI, new byte[0], data);
    return record;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * Implementation for the CreateNdefMessageCallback interface
 */
@Override
public NdefMessage createNdefMessage(NfcEvent event) {
    Time time = new Time();
    time.setToNow();
    String text = ("Beam me up!\n\n" +
            "Beam Time: " + time.format("%H:%M:%S"));
    NdefMessage msg = new NdefMessage(NdefRecord.createMime(
            "application/com.example.android.beam", text.getBytes())
     /**
      * The Android Application Record (AAR) is commented out. When a device
      * receives a push with an AAR in it, the application specified in the AAR
      * is guaranteed to run. The AAR overrides the tag dispatch system.
      * You can add it back in to guarantee that this
      * activity starts when receiving a beamed message. For now, this code
      * uses the tag dispatch system.
      */
      //,NdefRecord.createApplicationRecord("com.example.android.beam")
    );
    return msg;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
private String readNFCTag(Intent intent){
    String response=null;
    if(NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())){
        //從標簽讀取數據
        Parcelable[] nfcMsgs=intent.getParcelableArrayExtra(
                NfcAdapter.EXTRA_NDEF_MESSAGES
        );
        NdefMessage msgs[]=null;
        int contentSize=0;
        if(nfcMsgs!=null){
            msgs=new NdefMessage[nfcMsgs.length];
            // 標簽可能存儲多個NdefMessage對象，一般情況下隻有一個
            for(int i=0;i<nfcMsgs.length;i++){
                // 轉換為NdefMessage對象
                msgs[i]= (NdefMessage) nfcMsgs[i];
                // 計算數據的總長度
                contentSize+=msgs[i].toByteArray().length;
            }
        }
        try{
            if(msgs!=null){
                // 隻讀第一個信息
                NdefRecord record=msgs[0].getRecords()[0];
                response=parseTextRecord(record);
                System.out.println(response);
            }
        }
        catch (Exception e){
            Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_LONG).show();
        }
    }
    return response;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
private String parseTextRecord(NdefRecord record){
    String response=null;
    // 驗證TNF是否為TNF_WELL_KNOWN
    if(record.getTnf()!=NdefRecord.TNF_WELL_KNOWN) {
        System.out.println("不是TNF_WELL_KNOW");
        return null;
    }

    byte[] payload=record.getPayload();
    Byte statusByte=payload[0];
    String textCoding=((statusByte&0x80)==0)?"utf-8":"utf-16";
    int codeLength=statusByte&0x3f;
    try{
        response=new String(payload,codeLength+1,payload.length-codeLength-1,textCoding);
    }
    catch(UnsupportedEncodingException e){
        Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_LONG).show();
    }
    return response;
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * Sets this activity's Android Beam message to one representing the given session.
 */
public static void setBeamSessionUri(Activity activity, Uri sessionUri) {
    NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(activity);
    if (nfcAdapter == null) {
        // No NFC :-(
        return;
    }

    nfcAdapter.setNdefPushMessage(new NdefMessage(
            new NdefRecord[]{
                    new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
                            ScheduleContract.makeContentItemType(
                                    ScheduleContract.Sessions.CONTENT_TYPE_ID).getBytes(),
                            new byte[0],
                            sessionUri.toString().getBytes())
            }), activity);
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
private void eraseTag(CallbackContext callbackContext) throws JSONException {
    Tag tag = savedIntent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
    NdefRecord[] records = {
        new NdefRecord(NdefRecord.TNF_EMPTY, new byte[0], new byte[0], new byte[0])
    };
    writeNdefMessage(new NdefMessage(records), tag, callbackContext);
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    cinemas = DBHelper.getInstance(getContext()).getCinemas();

    watcher = new Gson().fromJson(getArguments().getString("watcher"), Watcher.class);

    nfcAdapter = NfcAdapter.getDefaultAdapter(getActivity());
    if(nfcAdapter != null) {
        nfcAdapter.setNdefPushMessageCallback(new NfcAdapter.CreateNdefMessageCallback() {
            @Override
            public NdefMessage createNdefMessage(NfcEvent nfcEvent) {
                return new NdefMessage(
                        new NdefRecord[] {
                                NdefRecord.createUri(BuildConfig.SERVER_BASE_URL + "w/" + watcher.getID()),
                                NdefRecord.createApplicationRecord(BuildConfig.APPLICATION_ID)
                        }
                );
            }
        }, getActivity());
    }
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
/**
 * Write text to a tag
 *
 * @param textToWrite the text to write
 */
public void write(String textToWrite) {

    Locale locale = Locale.US;
    final byte[] langBytes = locale.getLanguage().getBytes(Charset.forName("UTF-8"));
    final byte[] textBytes = textToWrite.getBytes(Charset.forName("UTF-8"));

    final int utfBit = 0;
    final char status = (char) (utfBit + langBytes.length);
    final byte[] data = new byte[1 + langBytes.length + textBytes.length];

    data[0] = (byte) status;
    System.arraycopy(langBytes, 0, data, 1, langBytes.length);
    System.arraycopy(textBytes, 0, data, 1 + langBytes.length, textBytes.length);

    NdefRecord record = new NdefRecord(NdefRecord.TNF_WELL_KNOWN, NdefRecord.RTD_TEXT, new byte[0], data);
    NdefRecord[] records = {record};
    messageToWrite = new NdefMessage(records);
}
 

import android.nfc.NdefRecord; //導入依賴的package包/類
private void readText(NdefRecord record) {
    int start;
    String payload = record.toString();
    String MAC;

    start = payload.indexOf("payload=");
    MAC = payload.substring(start + 12);

    MACs[mac_cnt] = MAC.substring(10, 12) + ":";
    MACs[mac_cnt] += MAC.substring(8, 10) + ":";
    MACs[mac_cnt] += MAC.substring(6, 8) + ":";
    MACs[mac_cnt] += MAC.substring(4, 6) + ":";
    MACs[mac_cnt] += MAC.substring(2, 4) + ":";
    MACs[mac_cnt] += MAC.substring(0, 2);

    mac_cnt++;

}