使用Android获取设备的NFC卡的UID

Question

I'm developing an application in which I want to get the NFC serial number of a device. When I press a button, I want the application to find the UID of the NFC card and store it in a DB. The only problem is that I have no idea how to get the UID and if that's possible on Android.

Answer 1

Please read doc: http://developer.android.com/guide/topics/connectivity/nfc/nfc.html

Tag have method getId() :

Get the Tag Identifier (if it has one).

The tag identifier is a low level serial number, used for anti-collision and identification.

Most tags have a stable unique identifier (UID), but some tags will generate a random ID every time they are discovered (RID), and there are some tags with no ID at all (the byte array will be zero-sized).

The size and format of an ID is specific to the RF technology used by the tag.

This function retrieves the ID as determined at discovery time, and does not perform any further RF communication or block.

It could be something like this:

@Override protected void onNewIntent(Intent intent) {
    if(NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())) {
        Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
        Log.d(TAG, "tag ID = " + tag.getId().toString());
    }
    super.onNewIntent(intent);
}