Do not index NFC for search if NFC is not present

import android.app.Activity;

import android.content.Context;

import android.content.Intent;

import android.content.pm.PackageManager;

import android.content.res.Resources;

import android.nfc.NfcAdapter;

import android.os.Bundle;

public class PaymentSettings extends SettingsPreferenceFragment implements Indexable {

    public static final String TAG = "PaymentSettings";

    static final String PAYMENT_KEY = "payment";

    private PaymentBackend mPaymentBackend;

    @Override

        if (appInfos != null && appInfos.size() > 0) {

            NfcPaymentPreference preference =

                    new NfcPaymentPreference(getPrefContext(), mPaymentBackend);

            preference.setKey("payment");

            preference.setKey(PAYMENT_KEY);

            screen.addPreference(preference);

            NfcForegroundPreference foreground = new NfcForegroundPreference(getPrefContext(),

                    mPaymentBackend);

                result.add(data);

                return result;

            }

            @Override

            public List<String> getNonIndexableKeys(Context context) {

                final PackageManager pm = context.getPackageManager();

                if (pm.hasSystemFeature(PackageManager.FEATURE_NFC)) return null;

                final List<String> nonVisibleKeys = new ArrayList<String>();

                nonVisibleKeys.add(PAYMENT_KEY);

                return nonVisibleKeys;

            }

    };

}