如何扫描未格式化的NFC标签

时间：2013-01-11 10:52:37

标签： android android-intent nfc intentfilter

我有一个应用程序扫描NFC标签以从有效负载获取信息，然后通过Web服务将该信息发送到服务器。它工作正常。标签是Mifare。我加入公司之前系统的移动部分是用J2me为诺基亚c700编写的。我在Android中重写了这个系统。 Android应用可以获取标记ID并读取有效负载。如果没有有效负载，那么它只读取标签ID，这很好。

问题是当我扫描一个尚未格式化的标签时，我无法获得tagID。 nokias上的旧系统可以从无格式标记中读取tagID。我怎么能在Android中这样做？为什么标签必须格式化？

提前致谢。

[编辑] 

if( intentAction.equalsIgnoreCase(NFC_ACTION)){

             nfcScanTimeFromDB = null;

            cursor = nfcscannerapplication.loginValidate.getLastTagFromTransations();

            if (cursor.getCount() > 0) {
                if (cursor.moveToLast()) {

                    _tagScanTime = cursor.getLong(cursor
                            .getColumnIndex(LoginValidate.C_TAG_SCAN_TIME));

                    nfcScanTimeFromDB = new DateTime(_tagScanTime);

                }
            }

            if(cursor.getCount() == 0){
                //DB must be empty
                Log.e(TAG, "just scanned an nfc tag and DB must be empty");
                Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);

                tagId = bytesToHexString(tag.getId());
                Log.e(TAG, "tagId immediately after scanning nfc tag = " + tagId);

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

                    Log.e(TAG, "NFC Tag scanned");

                    // get the messages from the intent
                    Parcelable[] rawMsgs = intent
                            .getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
                    if (rawMsgs != null) {
                        msgs = new NdefMessage[rawMsgs.length];
                        for (int i = 0; i < rawMsgs.length; i++) {
                            msgs[i] = (NdefMessage) rawMsgs[i];
                        }
                    }
                } else {
                    Log.e(TAG, "ndef not discovered!!!!!!");
                }

                 Cursor c = nfcscannerapplication.loginValidate.queryAllFromCarer();

                  if(c.getCount() == 0){

                      Toast.makeText(this, "Please login before signing in",
                                Toast.LENGTH_LONG).show();
                      Intent intent = new Intent(NfcscannerActivity.this, EntryActivity.class);
                      startActivity(intent);
                  }else{
                      c.moveToLast();
                      tagPerson = c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));
                  }




                // process the msgs array
                for (int i = 0; i < msgs.length; i++) {

                    NdefRecord[] records = msgs[i].getRecords();
                    Log.e(TAG, "ndefrecord has a length of " + records.length);

                    tr = parse(records[i]);
                    payload = tr.getText();

                    Log.e(TAG, "TextRecord.text = " + tr.getText());


                }

                if(payload.length() == 0){

                    tagType = "1";
                    tagCompany = c.getString(c.getColumnIndex(LoginValidate.C_COMP_ID));
                    tagPerson = tagId;//c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));
                    tagUserName = tagId;
                    tagLatitude = "0.0000000";
                    tagLongitude = "0.0000000"; 

                    if(rotasOnly.trim().equalsIgnoreCase("false")){
                         processinfo();
                    }
                }else{

                // /////////////////////////////////////////////////// split the payload
                // using delimiter. assign value at position[0] to tagType
                String[] splitPayload = payload.split(",");



                tagType = splitPayload[0];
                //tagCompany = splitPayload[1];


                c.moveToLast();
                tagCompany = c.getString(c.getColumnIndex(LoginValidate.C_COMP_ID));


                if(splitPayload[2].length() == 0 || splitPayload[2] == null || splitPayload[2].trim().equalsIgnoreCase("0")){

                    tagPerson = c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));

                }else{

                tagPerson = splitPayload[2];

                }

                tagUserName = splitPayload[3];
                tagLatitude = "0.0000000";
                tagLongitude = "0.0000000"; 

                if(rotasOnly.trim().equalsIgnoreCase("false")){
                     processinfo();

                }else{
                    Log.e(TAG, "cant process tag because of company option 160 rotas only");
                }

                }   

            }else{



            //DB not empty///////////////////

            DateTime nfcScanTimeMinustagTouchInterval = new DateTime();
            nfcScanTimeMinustagTouchInterval.minusMinutes(Integer.parseInt(tagTouchInterval));





//          AudioManager audioManager = (AudioManager) this.getSystemService(Context.AUDIO_SERVICE);
//          // For example to set the volume of played media to maximum.
//          audioManager.setStreamVolume (AudioManager.STREAM_MUSIC, 
//                        audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC),0);
//          MediaPlayer mediaPlayer = MediaPlayer.create(this, R.raw.meep2); 
//          mediaPlayer.start();
            //mediaPlayer.release();
            //mediaPlayer = null; 


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

        tagId = bytesToHexString(tag.getId());
        Log.e(TAG, "tagId immediately after scanning nfc tag = " + tagId);

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

            Log.e(TAG, "NFC Tag scanned");

            // get the messages from the intent
            Parcelable[] rawMsgs = intent
                    .getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
            if (rawMsgs != null) {
                msgs = new NdefMessage[rawMsgs.length];
                for (int i = 0; i < rawMsgs.length; i++) {
                    msgs[i] = (NdefMessage) rawMsgs[i];
                }
            }
        } else {
            Log.e(TAG, "ndef not discovered!!!!!!");
        }

         Cursor c = nfcscannerapplication.loginValidate.queryAllFromCarer();

          if(c.getCount() == 0){

              Toast.makeText(this, "Please login before signing in",
                        Toast.LENGTH_LONG).show();
              Intent intent = new Intent(NfcscannerActivity.this, EntryActivity.class);
              startActivity(intent);
          }else{
              c.moveToLast();
              tagPerson = c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));
          }




        // process the msgs array
        for (int i = 0; i < msgs.length; i++) {

            NdefRecord[] records = msgs[i].getRecords();
            Log.e(TAG, "ndefrecord has a length of " + records.length);

            tr = parse(records[i]);
            payload = tr.getText();

            Log.e(TAG, "TextRecord.text = " + tr.getText());
            Log.e(TAG, "payload len = " + payload.length() + " so must be a blank formatted tag!");


        }

        if(payload.length() == 0){

            tagType = "1";
            tagCompany = c.getString(c.getColumnIndex(LoginValidate.C_COMP_ID));
            tagPerson = tagId;//c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));
            tagUserName = tagId;
            tagLatitude = "0.0000000";
            tagLongitude = "0.0000000"; 

            if(rotasOnly.trim().equalsIgnoreCase("false")){
                 processinfo();
            }
        }else{


        // /////////////////////////////////////////////////// split the payload
        // using delimiter. assign value at position[0] to tagType
        String[] splitPayload = payload.split(",");



        tagType = splitPayload[0];
        //tagCompany = splitPayload[1];
        tagCompany = c.getString(c.getColumnIndex(LoginValidate.C_COMP_ID));

        if(splitPayload[2].length() == 0 || splitPayload[2] == null || splitPayload[2].trim().equalsIgnoreCase("0")){

            tagPerson = c.getString(c.getColumnIndex(LoginValidate.C_CARER_ID));

        }else{

        tagPerson = splitPayload[2];

        }

        tagUserName = splitPayload[3];
        tagLatitude = "0.0000000";
        tagLongitude = "0.0000000"; 

        if(rotasOnly.trim().equalsIgnoreCase("false")){
             processinfo();
        }else{
            Log.e(TAG, "cant process tag because of company option 160 rotas only");
        }


        }   

            }//finished processing tag with a NONE empty DB




        }

[EDIT2] 

if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
                  Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
                  byte[] tagIdbyteArray = tag.getId();
                  Log.e(TAG, "unformatted tag found with a tagID of " + tagIdbyteArray);
                }

[EDIT3] 

<activity
            android:name=".NfcscannerActivity"
            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.nfc.action.NDEF_DISCOVERED" />

                <category android:name="android.intent.category.DEFAULT" />

                <data android:mimeType="text/plain" />
            </intent-filter>
            <intent-filter>
                <action android:name="com.carefreegroup.QRCODE_ACTION" />

                <category android:name="android.intent.category.DEFAULT" />

                <data android:mimeType="text/plain" />
            </intent-filter>

            <intent-filter>
            <action android:name="android.nfc.action.TECH_DISCOVERED"/>
            </intent-filter> 

            <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
                       android:resource="@xml/nfc_tech_filter" />

        </activity>


<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  <tech-list>
      <tech>android.nfc.tech.IsoDep</tech>
        <tech>android.nfc.tech.NfcA</tech>
        <tech>android.nfc.tech.NfcB</tech>
        <tech>android.nfc.tech.NfcF</tech>
        <tech>android.nfc.tech.NfcV</tech>
        <tech>android.nfc.tech.Ndef</tech>
        <tech>android.nfc.tech.NdefFormatable</tech>
    <tech>android.nfc.tech.MifareClassic</tech>
    <tech>android.nfc.tech.MifareUltralight</tech>
  </tech-list>
</resources>


if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
                  Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
                  byte[] tagIdbyteArray = tag.getId();
                  Log.e(TAG, "unformatted tag found with a tagID of " + tagIdbyteArray);
                }

[编辑4] 

01-21 09:27:35.180: D/NativeNfcTag(512): Connect Failed - status = 146
01-21 09:27:35.180: E/NFC JNI(512): doDisconnect() - Target already disconnected

[edit5] 

01-21 10:07:25.420: E/NfcService(512): No tag fallback activity found for Intent { act=android.nfc.action.TAG_DISCOVERED (has extras) }

[edit6] 

<?xml version="1.0" encoding="utf-8"?>
<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  <tech-list>

    <tech>android.nfc.tech.MifareUltralight</tech>
  </tech-list>
</resources>

1 个答案:

答案 0 :(得分：1)

如果MIFARE Classic标签未格式化为包含NDEF，您可以按照以下方式（从documentation）接收它们的意图（并获取ID）：

添加您需要接收意图的活动的清单：

<activity>
  ...
  <intent-filter>
    <action android:name="android.nfc.action.TECH_DISCOVERED"/>
    <category android:name="android.intent.category.DEFAULT" />
  </intent-filter>

  <meta-data android:name="android.nfc.action.TECH_DISCOVERED"
    android:resource="@xml/nfc_tech_filter" />
  ...
</activity>

创建一个新文件<project-root>/res/xml/nfc_tech_filter.xml，其中包含：

<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
  <tech-list>
    <tech>android.nfc.tech.MifareClassic</tech>
  </tech-list>
  <tech-list>
    <tech>android.nfc.tech.MifareUltralight</tech>
  </tech-list>
</resources>

在您的活动中，在某个可取的地方，添加：

if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
  Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
  byte[] tagId = tag.getId();
}
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