NFC payment settings.

First version, pending final UX.

Change-Id: I357e900c3f2012b35814ae197c49a8c9b97b7148

src/com/android/settings/nfc/PaymentBackend.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.nfc;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.drawable.Drawable;
+import android.nfc.NfcAdapter;
+import android.nfc.cardemulation.ApduServiceInfo;
+import android.nfc.cardemulation.CardEmulationManager;
+import android.provider.Settings;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class PaymentBackend {
+    public static final String TAG = "Settings.PaymentBackend";
+
+    public static class PaymentAppInfo {
+        CharSequence caption;
+        Drawable icon;
+        boolean isDefault;
+        public ComponentName componentName;
+    }
+
+    private final Context mContext;
+    private final NfcAdapter mAdapter;
+    private final CardEmulationManager mCardEmuManager;
+
+    public PaymentBackend(Context context) {
+        mContext = context;
+
+        mAdapter = NfcAdapter.getDefaultAdapter(context);
+        mCardEmuManager = CardEmulationManager.getInstance(mAdapter);
+    }
+
+    public List<PaymentAppInfo> getPaymentAppInfos() {
+        PackageManager pm = mContext.getPackageManager();
+        List<ApduServiceInfo> serviceInfos =
+                mCardEmuManager.getServices(CardEmulationManager.CATEGORY_PAYMENT);
+        List<PaymentAppInfo> appInfos = new ArrayList<PaymentAppInfo>();
+
+        if (serviceInfos == null) return appInfos;
+
+        ComponentName defaultApp = getDefaultPaymentApp();
+
+        for (ApduServiceInfo service : serviceInfos) {
+            PaymentAppInfo appInfo = new PaymentAppInfo();
+            appInfo.caption = service.loadLabel(pm);
+            appInfo.icon = service.loadIcon(pm);
+            appInfo.isDefault = service.getComponent().equals(defaultApp);
+            appInfo.componentName = service.getComponent();
+            appInfos.add(appInfo);
+        }
+
+        return appInfos;
+    }
+
+    ComponentName getDefaultPaymentApp() {
+        String componentString = Settings.Secure.getString(mContext.getContentResolver(),
+                Settings.Secure.NFC_PAYMENT_DEFAULT_COMPONENT);
+        if (componentString != null) {
+            return ComponentName.unflattenFromString(componentString);
+        } else {
+            return null;
+        }
+    }
+
+    public void setDefaultPaymentApp(ComponentName app) {
+        Settings.Secure.putString(mContext.getContentResolver(),
+                Settings.Secure.NFC_PAYMENT_DEFAULT_COMPONENT,
+                app != null ? app.flattenToString() : null);
+    }
+
+    public boolean isAutoPaymentMode() {
+        String mode = Settings.Secure.getString(mContext.getContentResolver(),
+                Settings.Secure.NFC_PAYMENT_MODE);
+        return (!CardEmulationManager.PAYMENT_MODE_MANUAL.equals(mode));
+    }
+
+    public void setAutoPaymentMode(boolean enable) {
+        Settings.Secure.putString(mContext.getContentResolver(),
+                Settings.Secure.NFC_PAYMENT_MODE,
+                enable ? CardEmulationManager.PAYMENT_MODE_AUTO
+                       : CardEmulationManager.PAYMENT_MODE_MANUAL);
+    }
+}