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      1 /*
      2  * Copyright (C) 2017 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.android.settings.applications.defaultapps;
     18 
     19 import android.content.Context;
     20 import android.content.pm.PackageManager;
     21 import android.nfc.NfcAdapter;
     22 import android.os.UserManager;
     23 import android.support.v7.preference.Preference;
     24 
     25 import com.android.settings.R;
     26 import com.android.settings.core.PreferenceControllerMixin;
     27 import com.android.settings.nfc.PaymentBackend;
     28 import com.android.settingslib.core.AbstractPreferenceController;
     29 
     30 public class DefaultPaymentSettingsPreferenceController extends AbstractPreferenceController
     31         implements PreferenceControllerMixin {
     32 
     33     private final NfcAdapter mNfcAdapter;
     34     private final PackageManager mPackageManager;
     35     private final UserManager mUserManager;
     36     private PaymentBackend mPaymentBackend;
     37 
     38     public DefaultPaymentSettingsPreferenceController(Context context) {
     39         super(context);
     40         mPackageManager = context.getPackageManager();
     41         mUserManager = (UserManager) context.getSystemService(Context.USER_SERVICE);
     42         mNfcAdapter = NfcAdapter.getDefaultAdapter(mContext);
     43     }
     44 
     45     @Override
     46     public boolean isAvailable() {
     47         return mPackageManager.hasSystemFeature(PackageManager.FEATURE_NFC)
     48                 && mPackageManager.hasSystemFeature(PackageManager.FEATURE_NFC_HOST_CARD_EMULATION)
     49                 && mUserManager.isAdminUser()
     50                 && mNfcAdapter != null
     51                 && mNfcAdapter.isEnabled();
     52     }
     53 
     54     @Override
     55     public void updateState(Preference preference) {
     56         if (mPaymentBackend == null) {
     57             if (mNfcAdapter != null) {
     58                 mPaymentBackend = new PaymentBackend(mContext);
     59             } else {
     60                 mPaymentBackend = null;
     61             }
     62         }
     63         if (mPaymentBackend == null) {
     64             return;
     65         }
     66         mPaymentBackend.refresh();
     67         final PaymentBackend.PaymentAppInfo app = mPaymentBackend.getDefaultApp();
     68         if (app != null) {
     69             preference.setSummary(app.label);
     70         } else {
     71             preference.setSummary(R.string.app_list_preference_none);
     72         }
     73     }
     74 
     75     @Override
     76     public String getPreferenceKey() {
     77         return "default_payment_app";
     78     }
     79 }
     80