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      1 /*
      2  * Copyright (C) 2013 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.nfc;
     18 
     19 import android.content.ComponentName;
     20 import android.content.Context;
     21 import android.content.pm.PackageManager;
     22 import android.graphics.drawable.Drawable;
     23 import android.nfc.NfcAdapter;
     24 import android.nfc.cardemulation.ApduServiceInfo;
     25 import android.nfc.cardemulation.CardEmulation;
     26 import android.provider.Settings;
     27 import android.provider.Settings.SettingNotFoundException;
     28 
     29 import java.util.ArrayList;
     30 import java.util.List;
     31 
     32 public class PaymentBackend {
     33     public static final String TAG = "Settings.PaymentBackend";
     34 
     35     public static class PaymentAppInfo {
     36         CharSequence caption;
     37         Drawable banner;
     38         boolean isDefault;
     39         public ComponentName componentName;
     40     }
     41 
     42     private final Context mContext;
     43     private final NfcAdapter mAdapter;
     44     private final CardEmulation mCardEmuManager;
     45 
     46     public PaymentBackend(Context context) {
     47         mContext = context;
     48 
     49         mAdapter = NfcAdapter.getDefaultAdapter(context);
     50         mCardEmuManager = CardEmulation.getInstance(mAdapter);
     51     }
     52 
     53     public List<PaymentAppInfo> getPaymentAppInfos() {
     54         PackageManager pm = mContext.getPackageManager();
     55         List<ApduServiceInfo> serviceInfos =
     56                 mCardEmuManager.getServices(CardEmulation.CATEGORY_PAYMENT);
     57         List<PaymentAppInfo> appInfos = new ArrayList<PaymentAppInfo>();
     58 
     59         if (serviceInfos == null) return appInfos;
     60 
     61         ComponentName defaultApp = getDefaultPaymentApp();
     62 
     63         for (ApduServiceInfo service : serviceInfos) {
     64             PaymentAppInfo appInfo = new PaymentAppInfo();
     65             appInfo.banner = service.loadBanner(pm);
     66             appInfo.caption = service.getDescription();
     67             if (appInfo.caption == null) {
     68                 appInfo.caption = service.loadLabel(pm);
     69             }
     70             appInfo.isDefault = service.getComponent().equals(defaultApp);
     71             appInfo.componentName = service.getComponent();
     72             appInfos.add(appInfo);
     73         }
     74 
     75         return appInfos;
     76     }
     77 
     78     boolean isForegroundMode() {
     79         try {
     80             return Settings.Secure.getInt(mContext.getContentResolver(),
     81                     Settings.Secure.NFC_PAYMENT_FOREGROUND) != 0;
     82         } catch (SettingNotFoundException e) {
     83             return false;
     84         }
     85     }
     86 
     87     void setForegroundMode(boolean foreground) {
     88         Settings.Secure.putInt(mContext.getContentResolver(),
     89                 Settings.Secure.NFC_PAYMENT_FOREGROUND, foreground ? 1 : 0) ;
     90     }
     91 
     92     ComponentName getDefaultPaymentApp() {
     93         String componentString = Settings.Secure.getString(mContext.getContentResolver(),
     94                 Settings.Secure.NFC_PAYMENT_DEFAULT_COMPONENT);
     95         if (componentString != null) {
     96             return ComponentName.unflattenFromString(componentString);
     97         } else {
     98             return null;
     99         }
    100     }
    101 
    102     public void setDefaultPaymentApp(ComponentName app) {
    103         Settings.Secure.putString(mContext.getContentResolver(),
    104                 Settings.Secure.NFC_PAYMENT_DEFAULT_COMPONENT,
    105                 app != null ? app.flattenToString() : null);
    106     }
    107 }