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 
PaymentBackend(Context context)46     public PaymentBackend(Context context) {
47         mContext = context;
48 
49         mAdapter = NfcAdapter.getDefaultAdapter(context);
50         mCardEmuManager = CardEmulation.getInstance(mAdapter);
51     }
52 
getPaymentAppInfos()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 
isForegroundMode()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 
setForegroundMode(boolean foreground)87     void setForegroundMode(boolean foreground) {
88         Settings.Secure.putInt(mContext.getContentResolver(),
89                 Settings.Secure.NFC_PAYMENT_FOREGROUND, foreground ? 1 : 0) ;
90     }
91 
getDefaultPaymentApp()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 
setDefaultPaymentApp(ComponentName app)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 }