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];
    }
    // Process the messages array.
    ...
}

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