import android.nfc.NfcAdapter.ReaderCallback; //导入依赖的package包/类
@SuppressLint("NewApi")
private void setReaderMode(boolean enable, int delay) {
	if (nfcAdapter == null || !hasHCE())
		return;

	if (!enable) {
		nfcAdapter.disableReaderMode(activity);
		return;
	}

	Bundle opts = new Bundle();
	opts.putInt(NfcAdapter.EXTRA_READER_PRESENCE_CHECK_DELAY, 5000);

	int flags = NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK;
	flags |= NfcAdapter.FLAG_READER_NFC_A;

	// For the 'READ BINARY' problem of Braodcom's NFC stack.
	// Only works on Android 4.4+
	nfcAdapter.enableReaderMode(activity, new ReaderCallback() {

		@Override
		public void onTagDiscovered(Tag tag) {
			Intent i = new Intent().putExtra(EXTRA_TAG, tag);
			tagListener.onNewTagIntent(i);
		}
	}, flags, opts);
}