private static HashMap<String, Integer> getTechStringToCodeMap() {
    HashMap<String, Integer> techStringToCodeMap = new HashMap<String, Integer>();

    techStringToCodeMap.put(IsoDep.class.getName(), TagTechnology.ISO_DEP);
    techStringToCodeMap.put(MifareClassic.class.getName(), TagTechnology.MIFARE_CLASSIC);
    techStringToCodeMap.put(MifareUltralight.class.getName(), TagTechnology.MIFARE_ULTRALIGHT);
    techStringToCodeMap.put(Ndef.class.getName(), TagTechnology.NDEF);
    techStringToCodeMap.put(NdefFormatable.class.getName(), TagTechnology.NDEF_FORMATABLE);
    techStringToCodeMap.put(NfcA.class.getName(), TagTechnology.NFC_A);
    techStringToCodeMap.put(NfcB.class.getName(), TagTechnology.NFC_B);
    techStringToCodeMap.put(NfcF.class.getName(), TagTechnology.NFC_F);
    techStringToCodeMap.put(NfcV.class.getName(), TagTechnology.NFC_V);
    techStringToCodeMap.put(NfcBarcode.class.getName(), TagTechnology.NFC_BARCODE);

    return techStringToCodeMap;
}
 

public Tag mockTag(String technology) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
    // For future reference

    // Parameters :
    byte[] b = {0x8};
    String ndefClass = "android.nfc.tech.Ndef";

    // FieldName which marks the capacity of the tag
    String extraNdefMaxlength = (String) Class.forName(ndefClass).getField("EXTRA_NDEF_MAXLENGTH").get(null);

    // FieldName which marks the tags writability
    String cardWritableStateField = (String) Class.forName(ndefClass).getField("EXTRA_NDEF_CARDSTATE").get(null);

    // Field to mark tag R/W
    int cardWritable = Class.forName(ndefClass).getField("NDEF_MODE_READ_WRITE").getInt(null);

    Bundle techExtras = new Bundle();

    techExtras.putInt(extraNdefMaxlength, 2048);
    techExtras.putInt(cardWritableStateField, cardWritable);
    Bundle[] extras = {techExtras};
    int[] technologies = {TagTechnology.class.getField(technology.toUpperCase()).getInt(null)}; //https://android.googlesource.com/platform/frameworks/base.git/+/android-4.3_r2/core/java/android/nfc/tech/TagTechnology.java


    // https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/nfc/Tag.java :376
    Parcel parcel = Parcel.obtain();

    parcel.writeByteArray(b); //Sets the ID
    parcel.writeIntArray(technologies); // Sets the technology to NDEF
    parcel.writeArray(extras); // Needed to set properties for NDEF tag
    parcel.writeInt(1); // Service handle
    parcel.writeInt(1); // Indicating a mock

    return Tag.CREATOR.createFromParcel(parcel);
}
 

private String[] generateTechStringList(int[] techList) {
    final int size = techList.length;
    String[] strings = new String[size];
    for (int i = 0; i < size; i++) {
        switch (techList[i]) {
            case TagTechnology.ISO_DEP:
                strings[i] = IsoDep.class.getName();
                break;
            case TagTechnology.MIFARE_CLASSIC:
                strings[i] = MifareClassic.class.getName();
                break;
            case TagTechnology.MIFARE_ULTRALIGHT:
                strings[i] = MifareUltralight.class.getName();
                break;
            case TagTechnology.NDEF:
                strings[i] = Ndef.class.getName();
                break;
            case TagTechnology.NDEF_FORMATABLE:
                strings[i] = NdefFormatable.class.getName();
                break;
            case TagTechnology.NFC_A:
                strings[i] = NfcA.class.getName();
                break;
            case TagTechnology.NFC_B:
                strings[i] = NfcB.class.getName();
                break;
            case TagTechnology.NFC_F:
                strings[i] = NfcF.class.getName();
                break;
            case TagTechnology.NFC_V:
                strings[i] = NfcV.class.getName();
                break;
            case TagTechnology.NFC_BARCODE:
                strings[i] = NfcBarcode.class.getName();
                break;
            default:
                throw new IllegalArgumentException("Unknown tech type " + techList[i]);
        }
    }
    return strings;
}
 

protected NfcTagHandler(TagTechnology tech, TagTechnologyHandler handler) {
    mTech = tech;
    mTechHandler = handler;
}