问如何主动读取NFC标签-无需意图

EN

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        nfcAdapter = NfcAdapter.getDefaultAdapter(this);

        if (nfcAdapter == null || !nfcAdapter.isEnabled()) {
            Log.e(TAG, "No NFC Adapter found.");
            //finish();
        }

        Intent intent = new Intent(this, getClass());
        intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        //intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
        pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);

        IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
        try {
            // Handles all MIME based dispatches. You should specify only the ones that you need.
            ndef.addDataType("*/*");
        } catch (IntentFilter.MalformedMimeTypeException e) {
            throw new RuntimeException("failed to add MIME type", e);
        }
        //intentFiltersArray = new IntentFilter[]{ndef,};

        //Use no intent filters to accept all MIME types
        intentFiltersArray = new IntentFilter[]{};

        // The tech list array can be set to null to accept all types of tag
        techListsArray = new String[][]{new String[]{
                IsoDep.class.getName(),
                NfcA.class.getName(),
                NdefFormatable.class.getName()
        }};
    }

    public void onPause() {
        nfcAdapter.disableForegroundDispatch(this);

        super.onPause();
    }

    public void onResume() {
        nfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFiltersArray, techListsArray);

        super.onResume();
    }

    public void onNewIntent(Intent intent) {
        Tag nfcTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
        //do something with tagFromIntent
}